The BLAKE2b hash of `./response` is:
        7b55c0f5 68a8b4df 2ca14085 2e816df2
        b9a2dafe 50b2c5e2 5e6c9b6a df239de0
        223a9866 aba481a8 436fbd42 04a2c48a
        43725d94 2de47b23 c10c5e87 38fd6467

The main feature of this contribution is that it was computed with an
independent implementation of Powers of Tau.

My implementation, which I am open sourcing now at [1], was not public at the
time of computation. It is written in Go, shares no code with the main Rust
implementation, and uses the RELIC library for BLS12-381. The only detail that
was copied verbatim from the Rust codebase is the value of the curve
coefficient, but that's being resolved at [2]. The Zcash Company sponsored
this effort, but it was proposed and conducted by me independently.

The computation was simply performed on my main MacBook Pro, where the code
was developed. The laptop was rebooted after the computation and before
re-enabling Wi-Fi and reopening the browser. The git hash of the codebase was
26a0231c674ec6043ef77997d33d94787c55634a, the Go version 1.9.2, extra entropy
was fed to /dev/random before starting.

The full terminal transcript, and this attestation signed with a 
minisign/signify
key published at [3] are attached, and available at [4].

[1] https://github.com/FiloSottile/powersoftau
[2] https://github.com/relic-toolkit/relic/issues/64
[3] https://twitter.com/FiloSottile/status/956325095013863425
[4] https://gist.github.com/FiloSottile/cc142b683666ee1ce5ee77759bd0a367

-- Filippo Valsorda

2018-01-22 22:17 GMT+0100 Filippo Valsorda <fili...@ml.filippo.io>:
> _o/
> 
> I'm ready to go whenever there's a slot.
> 
> It will probably take me half a day, upload included.

Attachment: attestation.txt.minisig
Description: Binary data

The BLAKE2b hash of `./response` is:
        7b55c0f5 68a8b4df 2ca14085 2e816df2
        b9a2dafe 50b2c5e2 5e6c9b6a df239de0
        223a9866 aba481a8 436fbd42 04a2c48a
        43725d94 2de47b23 c10c5e87 38fd6467

The main feature of this contribution is that it was computed with an
independent implementation of Powers of Tau.

My implementation, which I am open sourcing now at [1], was not public at the
time of computation. It is written in Go, shares no code with the main Rust
implementation, and uses the RELIC library for BLS12-381. The only detail that
was copied verbatim from the Rust codebase is the value of the curve
coefficient, but that's being resolved at [2]. The Zcash Company sponsored
this effort, but it was proposed and conducted by me independently.

The computation was simply performed on my main MacBook Pro, where the code
was developed. The laptop was rebooted after the computation and before
re-enabling Wi-Fi and reopening the browser. The git hash of the codebase was
26a0231c674ec6043ef77997d33d94787c55634a, the Go version 1.9.2, extra entropy
was fed to /dev/random before starting.

The full terminal transcript follows below.

This attestation is signed with a minisign/signify key published at [3].

[1] https://github.com/FiloSottile/powersoftau
[2] https://github.com/relic-toolkit/relic/issues/64
[3] https://twitter.com/FiloSottile/status/956325095013863425

---

➜  powersoftau alias download
download='aria2c --check-certificate=true --http-accept-gzip=true -s 16 -k 5M 
-x 4 -j 16'
➜  powersoftau download 
https://s3-us-west-2.amazonaws.com/powersoftau/UPK2HSUb3XsjWDcyXkiAALsCyCNmIpwl/challenge

01/24 16:04:29 [NOTICE] Downloading 1 item(s)
[#430007 0B/0B CN:1 DL:0B]
01/24 16:04:31 [NOTICE] Allocating disk space. Use --file-allocation=none to 
disable it. See --file-allocation option in man page for more details.
 *** Download Progress Summary as of Wed Jan 24 16:05:30 2018 ***
=================================================================================================================
[#430007 69MiB/1.1GiB(6%) CN:4 DL:1.1MiB ETA:15m7s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:06:31 2018 ***
=================================================================================================================
[#430007 139MiB/1.1GiB(12%) CN:4 DL:1.2MiB ETA:13m46s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:07:31 2018 ***
=================================================================================================================
[#430007 212MiB/1.1GiB(18%) CN:4 DL:1.2MiB ETA:12m9s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:08:32 2018 ***
=================================================================================================================
[#430007 281MiB/1.1GiB(24%) CN:4 DL:1.1MiB ETA:12m8s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:09:32 2018 ***
=================================================================================================================
[#430007 357MiB/1.1GiB(31%) CN:4 DL:1.3MiB ETA:9m37s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:10:33 2018 ***
=================================================================================================================
[#430007 447MiB/1.1GiB(38%) CN:4 DL:1.4MiB ETA:7m54s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:11:33 2018 ***
=================================================================================================================
[#430007 536MiB/1.1GiB(46%) CN:4 DL:1.4MiB ETA:6m57s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:12:34 2018 ***
=================================================================================================================
[#430007 622MiB/1.1GiB(54%) CN:4 DL:1.4MiB ETA:5m56s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:13:35 2018 ***
=================================================================================================================
[#430007 710MiB/1.1GiB(61%) CN:4 DL:1.3MiB ETA:5m16s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:14:35 2018 ***
=================================================================================================================
[#430007 796MiB/1.1GiB(69%) CN:4 DL:1.4MiB ETA:4m7s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:15:36 2018 ***
=================================================================================================================
[#430007 860MiB/1.1GiB(74%) CN:4 DL:592KiB ETA:8m23s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:16:37 2018 ***
=================================================================================================================
[#430007 0.9GiB/1.1GiB(81%) CN:4 DL:1.3MiB ETA:2m43s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:17:37 2018 ***
=================================================================================================================
[#430007 0.9GiB/1.1GiB(87%) CN:4 DL:1.1MiB ETA:2m9s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

 *** Download Progress Summary as of Wed Jan 24 16:18:38 2018 ***
=================================================================================================================
[#430007 1.0GiB/1.1GiB(94%) CN:4 DL:1.4MiB ETA:45s]
FILE: /Users/filippo/tmp/powersoftau/challenge
-----------------------------------------------------------------------------------------------------------------

[#430007 1.1GiB/1.1GiB(99%) CN:1 DL:588KiB]
01/24 16:19:38 [NOTICE] Download complete: 
/Users/filippo/tmp/powersoftau/challenge

Download Results:
gid   |stat|avg speed  |path/URI
======+====+===========+=======================================================
430007|OK  |   1.2MiB/s|/Users/filippo/tmp/powersoftau/challenge

Status Legend:
(OK):download completed.
➜  powersoftau b2sum challenge
16b675d33a1b26aaae65054bc9b6dbf977b41f3fc946f19ac0e669c0bb288a88a5baec4e808e78d7ce448d1225ba99ce9767c3885de50dd328417a11ccb6705b
  challenge
➜  powersoftau git clone 
/Users/filippo/src/github.com/FiloSottile/powersoftau 
./src/github.com/FiloSottile/powersoftau
Cloning into './src/github.com/FiloSottile/powersoftau'...
done.
➜  powersoftau export GOPATH=$PWD
➜  powersoftau go build -work -x -v 
github.com/FiloSottile/powersoftau/cmd/taucompute
WORK=/var/folders/cm/zzcl1fjx27sc8sf3s6sd_0vw0000gn/T/go-build678128314
github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b
github.com/FiloSottile/powersoftau/internal/chacha20
github.com/FiloSottile/powersoftau/bls12
mkdir -p 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/
mkdir -p $WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/
mkdir -p $WORK/github.com/FiloSottile/powersoftau/internal/chacha20/_obj/
cd 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/compile -o 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b.a 
-trimpath $WORK -goversion go1.9.2 -p 
github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b -buildid 
c3de0d4d3d45d7ac7634a4173e618bf8552fce8e -D 
_/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b
 -I $WORK -pack -asmhdr 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/go_asm.h
 ./blake2b.go ./blake2bAVX2_amd64.go ./blake2b_generic.go ./blake2x.go 
./register.go
mkdir -p $WORK/github.com/FiloSottile/powersoftau/internal/
mkdir -p $WORK/github.com/FiloSottile/powersoftau/bls12/_obj/
cd 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/internal/chacha20
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/compile -o 
$WORK/github.com/FiloSottile/powersoftau/internal/chacha20.a -trimpath $WORK 
-goversion go1.9.2 -p github.com/FiloSottile/powersoftau/internal/chacha20 
-complete -buildid 5b887c21c0c2f5f9331b22aaae0d980bc6b02dd2 -D 
_/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/internal/chacha20
 -I $WORK -pack ./chacha_generic.go
mkdir -p $WORK/github.com/FiloSottile/powersoftau/
cd /Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12
CGO_LDFLAGS="-g" "-O2" 
"/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/lib/librelic_s.a"
 /usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/cgo -objdir 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/ -importpath 
github.com/FiloSottile/powersoftau/bls12 -- -I 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/ -g -O2 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include
 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/include
 g1.go g2.go relic.go
cd 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/asm -trimpath $WORK -I 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/
 -I /usr/local/Cellar/go/1.9.2/libexec/pkg/include -D GOOS_darwin -D 
GOARCH_amd64 -o 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/blake2bAVX2_amd64.o
 ./blake2bAVX2_amd64.s
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/asm -trimpath $WORK -I 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/
 -I /usr/local/Cellar/go/1.9.2/libexec/pkg/include -D GOOS_darwin -D 
GOARCH_amd64 -o 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/blake2b_amd64.o
 ./blake2b_amd64.s
pack r 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b.a 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/blake2bAVX2_amd64.o
 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/blake2b_amd64.o
 # internal
# github.com/FiloSottile/powersoftau/bls12
src/github.com/FiloSottile/powersoftau/bls12/g1.go:3:11: fatal error: 
'relic_core.h' file not found
 #include "relic_core.h"
          ^~~~~~~~~~~~~~
1 error generated.
➜  powersoftau cd ./src/github.com/FiloSottile/powersoftau
➜  powersoftau git:(master) git submodule init
Submodule 'relic' (https://github.com/relic-toolkit/relic) registered for path 
'bls12/relic'
➜  powersoftau git:(master) git status
On branch master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean
➜  powersoftau git:(master) git show-ref HEAD
26a0231c674ec6043ef77997d33d94787c55634a refs/remotes/origin/HEAD
➜  powersoftau git:(master) make
rm -rf bls12/build && mkdir bls12/build
cd bls12/build && cmake -DALLOC=DYNAMIC -DFP_PRIME=381 \
                -DSHLIB=off -DSTLIB=on -DRAND=UDEV -DTESTS=1 -DBENCH=0 \
                -DCOMP="-O3 -funroll-loops -Wno-unused-function" ../relic
CMake Error: The source directory 
"/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic"
 does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
make: *** [relic] Error 1
➜  powersoftau git:(master) git submodule update
Cloning into 
'/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic'...
Submodule path 'bls12/relic': checked out 
'5784facac01fc27fd9960cb8a9065b0a60b140ff'
➜  powersoftau git:(master) make
rm -rf bls12/build && mkdir bls12/build
cd bls12/build && cmake -DALLOC=DYNAMIC -DFP_PRIME=381 \
                -DSHLIB=off -DSTLIB=on -DRAND=UDEV -DTESTS=1 -DBENCH=0 \
                -DCOMP="-O3 -funroll-loops -Wno-unused-function" ../relic
-- The C compiler identification is AppleClang 9.0.0.9000039
-- The CXX compiler identification is AppleClang 9.0.0.9000039
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc 
-- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: 
/Library/Developer/CommandLineTools/usr/bin/c++
-- Check for working CXX compiler: 
/Library/Developer/CommandLineTools/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done

-- Configuring RELIC 0.4.1...

-- Available switches (default = CHECK, VERBS, DOCUM):

   DEBUG=[off|on] Build with debugging support.
   PROFL=[off|on] Build with profiling support.
   CHECK=[off|on] Build with error-checking support.
   VERBS=[off|on] Build with detailed error messages.
   TRACE=[off|on] Build with tracing support.
   OVERH=[off|on] Build with overhead estimation.
   DOCUM=[off|on] Build documentation.
   STRIP=[off|on] Build only selected algorithms.
   QUIET=[off|on] Build with printing disabled.
   COLOR=[off|on] Build with colored output.
   BIGED=[off|on] Build with big-endian support.
   SHLIB=[off|on] Build shared library.
   STLIB=[off|on] Build static library.
   STBIN=[off|on] Build static binaries.
   AMALG=[off|on] Build amalgamation for better performance.

-- Number of times each test or benchmark is ran (default = 50, 1000):

   TESTS=n        If n > 0, build automated tests and run them n times.
   BENCH=n        If n > 0, build automated benchmarks and run them n * n times.

-- Number of available processor cores (default = 1):

   CORES=n        If n > 1, please enable multithreading support.

-- Available modules (default = ALL)

   WITH=BN       Multiple precision arithmetic.
   WITH=DV       Temporary double-precision digit vectors.
   WITH=FP       Prime field arithmetic.
   WITH=FPX      Prime extension field arithmetic.
   WITH=FB       Binary field arithmetic.
   WITH=EP       Elliptic curves over prime fields.
   WITH=EPX      Elliptic curves over quadratic extensions of prime fields.
   WITH=EB       Elliptic curves over binary fields.
   WITH=ED       Elliptic Edwards curves over prime fields.
   WTTH=EC       Elliptic curve cryptography.
   WITH=PB       Pairings over binary elliptic curves.
   WITH=PP       Pairings over prime elliptic curves.
   WTTH=PC       Pairing-based cryptography.
   WITH=BC       Block ciphers (symmetric encryption).
   WITH=MD       Message digests (hash functions).
   WITH=CP       Cryptographic protocols.
   WITH=ALL      All of the above.
   Note: the programmer is responsible for not using unselected modules.

-- Available arithmetic backends (default = easy):

   ARITH=easy     Easy-to-understand implementation.
   ARITH=gmp      GNU Multiple Precision library.

-- Available memory-allocation policies (default = AUTO):

   ALLOC=AUTO     All memory is automatically allocated.
   ALLOC=STATIC   All memory is allocated statically once.
   ALLOC=DYNAMIC  All memory is allocated dynamically on demand.
   ALLOC=STACK    All memory is allocated from the stack.

-- Supported operating systems (default = LINUX):

   OPSYS=         Undefined/No specific operating system.
   OPSYS=LINUX    GNU/Linux operating system.
   OPSYS=FREEBSD  FreeBSD operating system.
   OPSYS=MACOSX   Mac OS X operating system.
   OPSYS=WINDOWS  Windows operating system.
   OPSYS=DROID    Android operating system.
   OPSYS=DUINO    Arduino platform.

-- Supported multithreading APIs (default = UNDEF):

   MULTI=         No multithreading support.
   MULTI=OPENMP   Open Multi-Processing.
   MULTI=PTHREAD  POSIX threads.

-- Supported timers (default = HPROC):

   TIMER=         No timer.
   TIMER=HREAL    GNU/Linux realtime high-resolution timer.
   TIMER=HPROC    GNU/Linux per-process high-resolution timer.
   TIMER=HTHRD    GNU/Linux per-thread high-resolution timer.
   TIMER=ANSI     ANSI-compatible timer.
   TIMER=POSIX    POSIX-compatible timer.
   TIMER=CYCLE    Cycle-counting timer. (architecture-dependant)

-- Prefix to identify this build of the library (default = ""):

   LABEL=relic

-- Available architectures (default = X64):

   ARCH=          No specific architecture (disable some features).
   ARCH=AVR       Atmel AVR ATMega128 8-bit architecture.
   ARCH=MSP       TI MSP430 16-bit architecture.
   ARCH=ARM       ARM 32-bit architecture.
   ARCH=X86       Intel x86-compatible 32-bit architecture.
   ARCH=X64       AMD x86_64-compatible 64-bit architecture.

-- Available word sizes (default = 64):

   WORD=8         Build a 8-bit library.
   WORD=16        Build a 16-bit library.
   WORD=32        Build a 32-bit library.
   WORD=64        Build a 64-bit library.

-- Byte boundary to align digit vectors (default = 1):

   ALIGN=1        Do not align digit vectors.
   ALIGN=2        Align digit vectors into 16-bit boundaries.
   ALIGN=8        Align digit vectors into 64-bit boundaries.
   ALIGN=16       Align digit vectors into 128-bit boundaries.

-- Multiple precision arithmetic configuration (BN module):

   ** Options for the multiple precision module (default = 1024,DOUBLE,0):

      BN_PRECI=n        The base precision in bits. Let w be n in words.
      BN_MAGNI=DOUBLE   A multiple precision integer can store 2w words.
      BN_MAGNI=CARRY    A multiple precision integer can store w+1 words.
      BN_MAGNI=SINGLE   A multiple precision integer can store w words.
      BN_KARAT=n        The number of Karatsuba steps.

   ** Available multiple precision arithmetic methods (default = 
COMBA;COMBA;MONTY;SLIDE;STEIN;BASIC):

      Integer multiplication:
      BN_METHD=BASIC    Schoolbook multiplication.
      BN_METHD=COMBA    Comba multiplication.

      Integer squaring:
      BN_METHD=BASIC    Schoolbook squaring.
      BN_METHD=COMBA    Comba squaring.
      BN_METHD=MULTP    Reuse multiplication for squaring.

      Modular reduction:
      BN_METHD=BASIC    Division-based modular reduction.
      BN_METHD=BARRT    Barrett modular reduction.
      BN_METHD=MONTY    Montgomery modular reduction.
      BN_METHD=RADIX    Diminished radix modular reduction.

      Modular exponentiation:
      BN_METHD=BASIC    Binary modular exponentiation.
      BN_METHD=MONTY    Montgomery powering ladder.
      BN_METHD=SLIDE    Sliding window modular exponentiation.

      Greatest Common Divisor:
      BN_METHD=BASIC    Euclid's standard GCD algorithm.
      BN_METHD=LEHME    Lehmer's fast GCD algorithm.
      BN_METHD=STEIN    Stein's binary GCD algorithm.

      Prime generation:
      BN_METHD=BASIC    Basic prime generation.
      BN_METHD=SAFEP    Safe prime generation.
      BN_METHD=STRON    Strong prime generation.

-- Prime field arithmetic configuration (FP module):

   ** Arithmetic precision of the prime field module (default = 256,0,off,off):

      FP_PRIME=n        The prime modulus size in bits.
      FP_KARAT=n        The number of Karatsuba levels.
      FP_PMERS=[off|on] Prefer Pseudo-Mersenne primes over random primes.
      FP_QNRES=[off|on] Use -1 as quadratic non-residue (make sure that p = 3 
mod 8).
      FP_WIDTH=w        Width w in [2,6] of window processing for 
exponentiation methods.

   ** Available prime field arithmetic methods (default = 
BASIC;COMBA;COMBA;MONTY;MONTY;SLIDE):
      Field addition
      FP_METHD=BASIC    Schoolbook addition.
      FP_METHD=INTEG    Integrated modular addition.

      Field multiplication
      FP_METHD=BASIC    Schoolbook multiplication.
      FP_METHD=INTEG    Integrated modular multiplication.
      FP_METHD=COMBA    Comba multiplication.

      Field squaring
      FP_METHD=BASIC    Schoolbook squaring.
      FP_METHD=INTEG    Integrated modular squaring.
      FP_METHD=COMBA    Comba squaring.
      FP_METHD=MULTP    Reuse multiplication for squaring.

      Modular reduction
      FP_METHD=BASIC    Division-based reduction.
      FP_METHD=QUICK    Fast reduction modulo special form prime (2^t - c, c > 
0).
      FP_METHD=MONTY    Montgomery modular reduction.

      Field inversion
      FP_METHD=BASIC    Inversion by Fermat's Little Theorem.
      FP_METHD=BINAR    Binary Inversion algorithm.
      FP_METHD=MONTY    Montgomery inversion.
      FP_METHD=EXGCD    Inversion by the Extended Euclidean algorithm.
      FP_METHD=LOWER    Pass inversion to the lower level.

      Field exponentiation
      FP_METHD=BASIC    Binary exponentiation.
      FP_METHD=SLIDE    Sliding window exponentiation.
      FP_METHD=MONTY    Constant-time Montgomery powering ladder.

-- Prime extension field arithmetic configuration (FPX module):

   ** Available bilinear pairing methods (default = BASIC;BASIC;BASIC):
      Quadratic extension arithmetic:
      FPX_METHD=BASIC    Basic quadratic extension field arithmetic.
      FPX_METHD=INTEG    Quadratic extension field arithmetic with embedded 
modular reduction.

      Cubic extension arithmetic:
      FPX_METHD=BASIC    Basic cubic extension field arithmetic.
      FPX_METHD=INTEG    Cubic extension field arithmetic with embedded modular 
reduction.

      Extension field arithmetic:
      FPX_METHD=BASIC    Basic extension field arithmetic.
      FPX_METHD=LAZYR    Lazy-reduced extension field arithmetic.

-- Binary field arithmetic configuration (FB module):

   ** Options for the binary elliptic curve module (default = 283,0,on,on,on):

      FB_POLYN=n        The irreducible polynomial size in bits.
      FB_KARAT=n        The number of Karatsuba levels.
      FB_TRINO=[off|on] Prefer trinomials.
      FB_SQRTF=[off|on] Prefer square-root friendly polynomials.
      FB_PRECO=[off|on] Precompute multiplication table for sqrt(z).
      FB_WIDTH=w        Width w in [2,6] of window processing for 
exponentiation methods.

   ** Available binary field arithmetic methods (default = 
LODAH;LUTBL;QUICK;BASIC;QUICK;QUICK;EXGCD;SLIDE;QUICK):

      Field multiplication:
      FB_METHD=BASIC    Right-to-left shift-and-add multiplication.
      FB_METHD=INTEG    Integrated modular multiplication.
      FB_METHD=RCOMB    Right-to-left comb multiplication.
      FB_METHD=LCOMB    Left-to-right comb multiplication.
      FB_METHD=LODAH    L�pez-Dahab comb multiplication with window of width 
4.

      Field squaring:
      FB_METHD=BASIC    Bit manipulation squaring.
      FB_METHD=INTEG    Integrated modular squaring.
      FB_METHD=LUTBL    Table-based squaring.

      Modular reduction:
      FB_METHD=BASIC    Shift-and-add modular reduction.
      FB_METHD=QUICK    Fast reduction modulo a trinomial or pentanomial.

      Field square root:
      FB_METHD=BASIC    Square root by repeated squaring.
      FB_METHD=QUICK    Fast square root extraction.

      Trace computation:
      FB_METHD=BASIC    Trace computation by repeated squaring.
      FB_METHD=QUICK    Fast trace computation.

      Quadratic equation solver:
      FB_METHD=BASIC    Solve a quadratic equation by half-trace computation.
      FB_METHD=QUICK    Fast solving with precomputed half-traces.

      Field inversion:
      FB_METHD=BASIC    Inversion by Fermat's Little Theorem.
      FB_METHD=BINAR    Binary Inversion algorithm.
      FB_METHD=ALMOS    Inversion by the Amost inverse algorithm.
      FB_METHD=EXGCD    Inversion by the Extended Euclidean algorithm.
      FB_METHD=ITOHT    Inversion by Itoh-Tsuji.
      FB_METHD=BRUCH    Hardware-friendly inversion by Brunner et al.
      FB_METHD=LOWER    Pass inversion to the lower level.

      Field exponentiation:
      FB_METHD=BASIC    Binary exponentiation.
      FB_METHD=SLIDE    Sliding window exponentiation.
      FB_METHD=MONTY    Constant-time Montgomery powering ladder.

      Iterated squaring/square-root:
      FB_METHD=BASIC    Iterated squaring/square-root by consecutive 
squaring/square-root.
      FB_METHD=QUICK    Iterated squaring/square-root by table-based method.

-- Prime elliptic curve arithmetic configuration (EP module):

   ** Options for the prime elliptic curve module (default = all on):

      EP_PLAIN=[off|on] Support for ordinary curves without endomorphisms.
      EP_SUPER=[off|on] Support for supersingular curves.
      EP_ENDOM=[off|on] Support for ordinary curves with endomorphisms.
      EP_MIXED=[off|on] Use mixed coordinates.

      EP_PRECO=[off|on] Build precomputation table for generator.
      EP_DEPTH=w        Width w in [2,8] of precomputation table for fixed 
point methods.
      EP_WIDTH=w        Width w in [2,6] of window processing for unknown point 
methods.

   ** Available prime elliptic curve methods (default = 
PROJC;LWNAF;COMBS;INTER):

      Point representation:
      EP_METHD=BASIC    Affine coordinates.
      EP_METHD=PROJC    Jacobian projective coordinates.

      Variable-base scalar multiplication:
      EP_METHD=BASIC    Binary method.
      EP_METHD=LWNAF    Left-to-right window NAF method (GLV for Koblitz 
curves).

      Fixed-base scalar multiplication:
      EP_METHD=BASIC    Binary method for fixed point multiplication.
      EP_METHD=YAOWI    Yao's windowing method for fixed point multiplication
      EP_METHD=NAFWI    NAF windowing method for fixed point multiplication.
      EP_METHD=COMBS    Single-table Comb method for fixed point multiplication.
      EP_METHD=COMBD    Double-table Comb method for fixed point multiplication.
      EP_METHD=LWNAF    Left-to-right window NAF method (GLV for Koblitz 
curves).

      Variable-base simultaneous scalar multiplication:
      EP_METHD=BASIC    Multiplication-and-addition simultaneous multiplication.
      EP_METHD=TRICK    Shamir's trick for simultaneous multiplication.
      EP_METHD=INTER    Interleaving of window NAFs (GLV for Koblitz curves).
      EP_METHD=JOINT    Joint sparse form.

-- Binary elliptic curve arithmetic configuration (EB module):

   ** Options for the binary elliptic curve module (default = on, w = 4):

      EB_PLAIN=[off|on] Support for ordinary curves without endomorphisms.
      EB_KBLTZ=[off|on] Support for Koblitz anomalous binary curves.
      EB_MIXED=[off|on] Use mixed coordinates.
      EB_PRECO=[off|on] Build precomputation table for generator.
      EB_DEPTH=w        Width w in [2,8] of precomputation table for fixed 
point methods.
      EB_WIDTH=w        Width w in [2,6] of window processing for unknown point 
methods.

   ** Available binary elliptic curve methods (default = 
PROJC;LWNAF;COMBS;INTER):

      Point representation:
      EB_METHD=BASIC    Affine coordinates.
      EB_METHD=PROJC    Projective coordinates (L�pez-Dahab for ordinary 
curves).

      Variable-base scalar multiplication:
      EB_METHD=BASIC    Binary double-and-add method.
      EB_METHD=LODAH    Lopez-Dahab constant-time point multiplication.
      EB_METHD=LWNAF    Left-to-right window (T)NAF method.
      EB_METHD=RWNAF    Right-to-left window (T)NAF method.
      EB_METHD=HALVE    Halving method.

      Fixed-base scalar multiplication:
      EB_METHD=BASIC    Binary method for fixed point multiplication.
      EB_METHD=YAOWI    Yao's windowing method for fixed point multiplication
      EB_METHD=NAFWI    NAF windowing method for fixed point multiplication.
      EB_METHD=COMBS    Single-table Comb method for fixed point multiplication.
      EB_METHD=COMBD    Double-table Comb method for fixed point multiplication.
      EB_METHD=LWNAF    Left-to-right window (T)NAF method.

      Variable-base simultaneous scalar multiplication:
      EB_METHD=BASIC    Multiplication-and-addition simultaneous multiplication.
      EB_METHD=TRICK    Shamir's trick for simultaneous multiplication.
      EB_METHD=INTER    Interleaving of window (T)NAFs.
      EB_METHD=JOINT    Joint sparse form.

-- Elliptic Edwards curve over prime fields arithmetic configuration (ED 
module):

   ** Options for the prime elliptic Edwards curve module (default = all on):
      ED_PRECO=[off|on] Build precomputation table for generator.
      ED_DEPTH=w        Width w in [2,6] of precomputation table for fixed 
point methods.
      ED_WIDTH=w        Width w in [2,6] of window processing for unknown point 
methods.

   ** Available prime elliptic Edwards curve methods (default = 
PROJC;LWNAF;COMBS;INTER):
      EP_METHD=PROJC     Simple projective twisted Edwards coordinates.
      EP_METHD=EXTND     Extended projective twisted Edwards coordinates.

      *** variable-base multiplication method ***
      ED_METHD=BASIC            Binary method.
      ED_METHD=SLIDE            Sliding window method.
      ED_METHD=MONTY            Montgomery ladder method.
      ED_METHD=FIXED            2-bit fixed window method.
      ED_METHD=LWNAF            Left-to-right window NAF method (GLV for 
Koblitz curves).

      *** fixed-base multiplication method ***
      ED_METHD=BASIC            Binary method for fixed point multiplication.
      ED_METHD=YAOWI            Yao's windowing method for fixed point 
multiplication
      ED_METHD=NAFWI            NAF windowing method for fixed point 
multiplication.
      ED_METHD=COMBS            Single-table Comb method for fixed point 
multiplication.
      ED_METHD=COMBD            Double-table Comb method for fixed point 
multiplication.
      ED_METHD=LWNAF            Left-to-right window NAF method (GLV for 
Koblitz curves).

      ED_METHD=LWNAF_MIXED Left-to-right window NAF mixed method (GLV for 
Koblitz curves).

      *** variable-base simultaneous multiplication method ***
      ED_METHD=BASIC    Multiplication-and-addition simultaneous multiplication.
      ED_METHD=TRICK    Shamir's trick for simultaneous multiplication.
      ED_METHD=INTER    Interleaving of window NAFs (GLV for Koblitz curves).
      ED_METHD=JOINT    Joint sparse form.

      Note: these methods must be given in order. Ex: 
ED_METHD="EXTND;LWNAF;COMBD;TRICK"

-- Elliptic curve cryptography configuration (EC module):

   ** Options for the binary elliptic curve module (default = on):

      EC_ENDOM=[off|on] Prefer (prime or binary) curves with endomorphisms.

   ** Available elliptic curve methods (default = PRIME):

      EC_METHD=PRIME    Use prime curves.
      EC_METHD=CHAR2    Use binary curves.
      EC_METHD=EDWARD   Use prime Edwards curves.

-- Bilinear pairings arithmetic configuration (PP module):

   ** Available bilinear pairing methods (default = BASIC;OATEP):

      Extension field arithmetic:
      PP_METHD=BASIC    Basic extension field arithmetic.
      PP_METHD=LAZYR    Lazy reduced extension field arithmetic.

      Pairing computation:
      PP_METHD=TATEP    Tate pairing.
      PP_METHD=WEILP    Weil pairing.
      PP_METHD=OATEP    Optimal ate pairing.

-- Message digest configuration (MD module):

   ** Available hash functions (default = SH256):

      MD_METHD=SHONE        SHA-1 hash function.
      MD_METHD=SH224        SHA-224 hash function.
      MD_METHD=SH256        SHA-256 hash function.
      MD_METHD=SH384        SHA-384 hash function.
      MD_METHD=SH512        SHA-512 hash function.
      MD_METHD=B2S160       BLAKE2s-160 hash function.
      MD_METHD=B2S256       BLAKE2s-256 hash function.

-- Cryptographic protocols configuration (CP module):

   ** Options for the cryptographic protocols module (default = PKCS1):

      CP_RSAPD=BASIC    RSA with basic padding.
      CP_RSAPD=PKCS1    RSA with PKCS#1 v1.5 padding.
      CP_RSAPD=PKCS2    RSA with PKCS#1 v2.1 padding.

   ** Available cryptographic protocols methods (default = QUICK;BASIC):

      CP_METHD=BASIC    Slow RSA decryption/signature.
      CP_METHD=QUICK    Fast RSA decryption/signature using CRT.

-- Available pseudo-random number generators (default = HASH):

   RAND=HASH      Use the HASH-DRBG generator. (recommended)
   RAND=UDEV      Use the operating system underlying generator.
   RAND=FIPS      Use the FIPS 186-2 (CN1) SHA1-based generator.
   RAND=CALL      Override the generator with a callback.

-- Available random number generator seeders (default = UDEV):

   SEED=WCGR      Use Windows' CryptGenRandom. (recommended)
   SEED=DEV       Use blocking /dev/random. (recommended)
   SEED=UDEV      Use non-blocking /dev/urandom. (recommended)
   SEED=LIBC      Use the libc rand()/random() functions. (insecure!)
   SEED=ZERO      Use a zero seed. (insecure!)

-- Configured operating system: MACOSX
-- Compiler flags: -pipe -std=c99 -m64 -Wall   -O3 -funroll-loops 
-Wno-unused-function
-- Linker flags: 
-L/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/src/low/easy/
-- Configured 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include/relic_conf.h.in
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)
-- Configuring done
-- Generating done
-- Build files have been written to: 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build
make -C bls12/build
Scanning dependencies of target arith_objs
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/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/src/epx/relic_ep2_curve.c:448:11:
 warning: incompatible pointer types passing 'fp2_st' (aka 'fp_st [2]')
      to parameter of type 'fp_t *' (aka 'unsigned long long **') 
[-Wincompatible-pointer-types]
        fp2_copy(ctx->ep2_a, a);
                 ^~~~~~~~~~
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include/relic_fpx.h:610:21:
 note: passing argument to parameter 'c' here
void fp2_copy(fp2_t c, fp2_t a);
                    ^
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/src/epx/relic_ep2_curve.c:449:11:
 warning: incompatible pointer types passing 'fp2_st' (aka 'fp_st [2]')
      to parameter of type 'fp_t *' (aka 'unsigned long long **') 
[-Wincompatible-pointer-types]
        fp2_copy(ctx->ep2_b, b);
                 ^~~~~~~~~~
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include/relic_fpx.h:610:21:
 note: passing argument to parameter 'c' here
void fp2_copy(fp2_t c, fp2_t a);
                    ^
2 warnings generated.
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../lib/librelic_s.a(relic_pool.c.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: 
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[ 84%] Built target relic_s
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make -C bls12/build test
Running tests...
Test project 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build
      Start  1: test_err
 1/18 Test  #1: test_err .........................   Passed    0.00 sec
      Start  2: test_bn
 2/18 Test  #2: test_bn ..........................   Passed   86.08 sec
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 3/18 Test  #3: test_dv ..........................   Passed    0.00 sec
      Start  4: test_fp
 4/18 Test  #4: test_fp ..........................   Passed    0.06 sec
      Start  5: test_fpx
 5/18 Test  #5: test_fpx .........................   Passed    0.32 sec
      Start  6: test_fb
 6/18 Test  #6: test_fb ..........................   Passed    1.97 sec
      Start  7: test_fbx
 7/18 Test  #7: test_fbx .........................   Passed    1.88 sec
      Start  8: test_ep
 8/18 Test  #8: test_ep ..........................   Passed    1.21 sec
      Start  9: test_epx
 9/18 Test  #9: test_epx .........................   Passed    1.67 sec
      Start 10: test_eb
10/18 Test #10: test_eb ..........................   Passed    5.70 sec
      Start 11: test_ed
11/18 Test #11: test_ed ..........................   Passed    0.00 sec
      Start 12: test_ec
12/18 Test #12: test_ec ..........................   Passed    0.26 sec
      Start 13: test_pc
13/18 Test #13: test_pc ..........................   Passed    8.22 sec
      Start 14: test_pp
14/18 Test #14: test_pp ..........................   Passed    3.03 sec
      Start 15: test_md
15/18 Test #15: test_md ..........................   Passed    0.91 sec
      Start 16: test_cp
16/18 Test #16: test_cp ..........................   Passed    4.46 sec
      Start 17: test_rand
17/18 Test #17: test_rand ........................   Passed    0.00 sec
      Start 18: test_core
18/18 Test #18: test_core ........................   Passed    0.00 sec

100% tests passed, 0 tests failed out of 18

Total Test time (real) = 115.80 sec
➜  powersoftau git:(master) popd
~/tmp/powersoftau ~/tmp ~
➜  powersoftau go build -work -x -v 
github.com/FiloSottile/powersoftau/cmd/taucompute
WORK=/var/folders/cm/zzcl1fjx27sc8sf3s6sd_0vw0000gn/T/go-build005436582
github.com/FiloSottile/powersoftau/bls12
github.com/FiloSottile/powersoftau/internal/chacha20
github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b
mkdir -p $WORK/github.com/FiloSottile/powersoftau/bls12/_obj/
mkdir -p $WORK/github.com/FiloSottile/powersoftau/
mkdir -p $WORK/github.com/FiloSottile/powersoftau/internal/chacha20/_obj/
cd /Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12
CGO_LDFLAGS="-g" "-O2" 
"/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/lib/librelic_s.a"
 /usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/cgo -objdir 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/ -importpath 
github.com/FiloSottile/powersoftau/bls12 -- -I 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/ -g -O2 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include
 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/include
 g1.go g2.go relic.go
mkdir -p $WORK/github.com/FiloSottile/powersoftau/internal/
mkdir -p 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/
mkdir -p $WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/
cd 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/internal/chacha20
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/compile -o 
$WORK/github.com/FiloSottile/powersoftau/internal/chacha20.a -trimpath $WORK 
-goversion go1.9.2 -p github.com/FiloSottile/powersoftau/internal/chacha20 
-complete -buildid 5b887c21c0c2f5f9331b22aaae0d980bc6b02dd2 -D 
_/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/internal/chacha20
 -I $WORK -pack ./chacha_generic.go
cd 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/compile -o 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b.a 
-trimpath $WORK -goversion go1.9.2 -p 
github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b -buildid 
c3de0d4d3d45d7ac7634a4173e618bf8552fce8e -D 
_/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b
 -I $WORK -pack -asmhdr 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/go_asm.h
 ./blake2b.go ./blake2bAVX2_amd64.go ./blake2b_generic.go ./blake2x.go 
./register.go
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/asm -trimpath $WORK -I 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/
 -I /usr/local/Cellar/go/1.9.2/libexec/pkg/include -D GOOS_darwin -D 
GOARCH_amd64 -o 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/blake2bAVX2_amd64.o
 ./blake2bAVX2_amd64.s
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/asm -trimpath $WORK -I 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/
 -I /usr/local/Cellar/go/1.9.2/libexec/pkg/include -D GOOS_darwin -D 
GOARCH_amd64 -o 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/blake2b_amd64.o
 ./blake2b_amd64.s
pack r 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b.a 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/blake2bAVX2_amd64.o
 
$WORK/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b/_obj/blake2b_amd64.o
 # internal
cd $WORK
clang -fdebug-prefix-map=a=b -c trivial.c
clang -gno-record-gcc-switches -c trivial.c
cd $WORK/github.com/FiloSottile/powersoftau/bls12/_obj
clang -I 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12 
-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fno-common -I ./ -g -O2 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include
 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/include
 -o ./_cgo_export.o -c _cgo_export.c
clang -I 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12 
-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fno-common -I ./ -g -O2 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include
 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/include
 -o ./g1.cgo2.o -c g1.cgo2.c
clang -I 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12 
-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fno-common -I ./ -g -O2 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include
 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/include
 -o ./g2.cgo2.o -c g2.cgo2.c
clang -I 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12 
-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fno-common -I ./ -g -O2 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include
 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/include
 -o ./relic.cgo2.o -c relic.cgo2.c
cd /Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12
clang -I . -fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fno-common -I 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/ -g -O2 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include
 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/include
 -o $WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g1.o -c g1.c
clang -I . -fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fno-common -I 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/ -g -O2 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include
 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/include
 -o $WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g2.o -c g2.c
cd $WORK/github.com/FiloSottile/powersoftau/bls12/_obj
clang -I 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12 
-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fno-common -I ./ -g -O2 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/relic/include
 
-I/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12/build/include
 -o ./_cgo_main.o -c _cgo_main.c
cd /Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12
clang -I . -fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fno-common -o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_cgo_.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_cgo_main.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_cgo_export.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g1.cgo2.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g2.cgo2.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/relic.cgo2.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g1.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g2.o -g -O2 
./build/lib/librelic_s.a
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/cgo -dynpackage bls12 
-dynimport $WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_cgo_.o -dynout 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_cgo_import.go
cd $WORK
clang -no-pie -c trivial.c
clang -nopie -c trivial.c
cd /Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12
clang -I . -fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fno-common -o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_all.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_cgo_export.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g1.cgo2.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g2.cgo2.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/relic.cgo2.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g1.o 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g2.o -g -O2 -Wl,-r 
-nostdlib -nopie
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/compile -o 
$WORK/github.com/FiloSottile/powersoftau/bls12.a -trimpath $WORK -goversion 
go1.9.2 -p github.com/FiloSottile/powersoftau/bls12 -buildid 
795bb89520b3d585c3c8cde87559539fc9d838f8 -D 
_/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/bls12 -I 
$WORK -pack $WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_cgo_gotypes.go 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g1.cgo1.go 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/g2.cgo1.go 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/relic.cgo1.go 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_cgo_import.go
pack r $WORK/github.com/FiloSottile/powersoftau/bls12.a 
$WORK/github.com/FiloSottile/powersoftau/bls12/_obj/_all.o # internal
github.com/FiloSottile/powersoftau/powersoftau
mkdir -p $WORK/github.com/FiloSottile/powersoftau/powersoftau/_obj/
cd 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/powersoftau
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/compile -o 
$WORK/github.com/FiloSottile/powersoftau/powersoftau.a -trimpath $WORK 
-goversion go1.9.2 -p github.com/FiloSottile/powersoftau/powersoftau -complete 
-buildid a9b395216ec6fe202d8c186afa0491ae73b23831 -importmap 
golang.org/x/crypto/blake2b=github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b
 -D 
_/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/powersoftau
 -I $WORK -I /Users/filippo/tmp/powersoftau/pkg/darwin_amd64 -pack ./compute.go 
./encoding.go ./hash_to_g2.go ./publickey.go
github.com/FiloSottile/powersoftau/cmd/taucompute
mkdir -p $WORK/github.com/FiloSottile/powersoftau/cmd/taucompute/_obj/
mkdir -p $WORK/github.com/FiloSottile/powersoftau/cmd/taucompute/_obj/exe/
cd 
/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/cmd/taucompute
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/compile -o 
$WORK/github.com/FiloSottile/powersoftau/cmd/taucompute.a -trimpath $WORK 
-goversion go1.9.2 -p main -complete -buildid 
1b02555f803cf474e73eebff2edf0a026f2565a5 -D 
_/Users/filippo/tmp/powersoftau/src/github.com/FiloSottile/powersoftau/cmd/taucompute
 -I $WORK -I /Users/filippo/tmp/powersoftau/pkg/darwin_amd64 -pack ./main.go
cd .
/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64/link -o 
$WORK/github.com/FiloSottile/powersoftau/cmd/taucompute/_obj/exe/a.out -L $WORK 
-L /Users/filippo/tmp/powersoftau/pkg/darwin_amd64 -extld=clang -buildmode=exe 
-buildid=1b02555f803cf474e73eebff2edf0a026f2565a5 
$WORK/github.com/FiloSottile/powersoftau/cmd/taucompute.a
mv $WORK/github.com/FiloSottile/powersoftau/cmd/taucompute/_obj/exe/a.out 
taucompute
➜  powersoftau mv 
/var/folders/cm/zzcl1fjx27sc8sf3s6sd_0vw0000gn/T/go-build005436582 .
➜  powersoftau ls -l
total 2379944
-rw-r--r--  1 filippo  staff  1207959712 24 Jan 16:19 challenge
drwx------  5 filippo  staff         160 24 Jan 16:27 go-build005436582
drwxr-xr-x  3 filippo  staff          96 24 Jan 16:21 src
-rwxr-xr-x  1 filippo  staff    10567000 24 Jan 16:27 taucompute
➜  powersoftau b2sum taucompute go-build005436582/**/*.a
8e018640f69e81f844985f6aa4df70df7f291faad3a7f03b3401410daf6389a274c52648d24ae94595727cddaaae10de893022edcf15c51473b9c7e4ab51236f
  taucompute
44d6fec75fc9739fdc28d8f3d9eb9f1429c5537ac109ca341e0f5d2c036546b30864d54bd6c749f73f7e0081f98fff02f9d55e3b010c9ddf8fc79db12aa1e210
  go-build005436582/github.com/FiloSottile/powersoftau/bls12.a
c241649f8d76c24476d180f8087f8c2b1b2cea0bd70b0d41d1f78e886303b3213377107786345fc88bab8b574fc222162786f4b95a75ba204b9afa14c9c1e20a
  go-build005436582/github.com/FiloSottile/powersoftau/cmd/taucompute.a
e68261086dc3d7d22470d32351103da8cb52b67d84e54f11da9f58c8618f9e68208bff4a6c4df389e49edcc21fa528c5a8c094c7676fea14a1c6f19ffb436734
  go-build005436582/github.com/FiloSottile/powersoftau/internal/chacha20.a
15101004a5624459a5188add5172e380b85e65dbe9f93e430186f4bd2656a2dc583b499bc206f9f62bd0160c6eb912dd71e17633ce7c8810cb4af10b3a4f5c39
  go-build005436582/github.com/FiloSottile/powersoftau/powersoftau.a
cbe5f621c29fea6f3577abacabdc04f60d59c79eb2737f2ca258fa0dbfb018771af0c58548c3c9011fa476b967db61546ff77fd0198263b485bad099443e694f
  
go-build005436582/github.com/FiloSottile/powersoftau/vendor/golang.org/x/crypto/blake2b.a
➜  powersoftau go version
go version go1.9.2 darwin/amd64
➜  powersoftau go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/filippo/tmp/powersoftau"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.9.2/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.9.2/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 
-fdebug-prefix-map=/var/folders/cm/zzcl1fjx27sc8sf3s6sd_0vw0000gn/T/go-build806951846=/tmp/go-build
 -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
➜  powersoftau sudo -s
Password:
bash-3.2# cat > /dev/random
[REDACTED]
bash-3.2# exit
➜  powersoftau ./taucompute
2018/01/24 16:37:01 Reading challenge...
2018/01/24 16:40:43 Starting computation...
2018/01/24 20:14:54 Writing response...
2018/01/24 20:18:49 Done!

Your contribution has been written to `./response`

The BLAKE2b hash of `./response` is:
        7b55c0f5 68a8b4df 2ca14085 2e816df2
        b9a2dafe 50b2c5e2 5e6c9b6a df239de0
        223a9866 aba481a8 436fbd42 04a2c48a
        43725d94 2de47b23 c10c5e87 38fd6467
➜  powersoftau cc --version
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.3.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
➜  powersoftau pbpaste > log.txt

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