btashton opened a new pull request #749:
URL: https://github.com/apache/incubator-nuttx-apps/pull/749
## Summary
This adds the initial support for the libtommath and libtomcrypt libraries.
These are setting the foundation for being able to run the dropbear ssh
server/client on NuttX.
## Impact
## Testing
Simple crypto test
```
nsh> echo "hello world" > /tmp/pt.txt
nsh> ltcrypt aes /tmp/pt.txt /tmp/ct.bin
Enter key: nsh> hexdump /tmp/ct.bin
/tmp/ct.bin at 00000000:
0000: e3 89 05 22 d7 c1 cb 54 b5 2a b2 40 a9 c1 b6 22 ..."...T.*.@..."
0010: d9 83 ac 24 09 79 ca 47 db 3c c9 9e ...$.y.G.<..
nsh> ltcrypt -d aes /tmp/ct.bin /dev/console
Enter key:
hello world
nsh>
```
```
nsh> tommath_test
Digit size 64 Bit
Size of mp_digit: 8
Size of mp_word: 16
MP_DIGIT_BIT: 60
MP_PREC: 32
SEED: 0x11a
TEST feature_detection
TEST trivial_stuff
TEST mp_get_set_i32
TEST mp_get_set_i64
TEST mp_and
TEST mp_cnt_lsb
TEST mp_complement
TEST mp_decr
TEST mp_div_3
9984
Passed div_3 testing
TEST mp_dr_reduce
31 digit modulus.... passed
TEST mp_pack_unpack
TEST mp_fread_fwrite
TEST mp_get_u32
TEST mp_get_u64
r = 0x7fffffffffffffff i = 62
TEST mp_get_ul
t = 0x7fffffffffffffff i = 62
TEST mp_log_u32
TEST mp_incr
TEST mp_invmod
TEST mp_is_square
999
TEST mp_kronecker
TEST mp_montgomery_reduce
digit size: 1000
TEST mp_root_u32
TEST mp_or
TEST mp_prime_is_prime
Testing mp_prime_is_prime() with Arnault's pseudoprime 803...901
Testing mp_prime_is_prime() with certified prime 2^1119 + 53
Testing ( safe-prime): 127 bits
TEST mp_prime_next_prime
TEST mp_prime_rand
Testing (not safe-prime): 127 bits
TEST mp_rand
TEST mp_read_radix
'123456' a == 123456, length = 7
'-123456' a == -123456, length = 8
'0' a == 0, length = 2
TEST mp_read_write_ubin
mp_to_ubin_size 113
mp_to_ubin len = 113
TEST mp_read_write_sbin
mp_to_sbin_size 114
mp_to_sbin len = 114
TEST mp_reduce_2k
128 bits(1)(2)........
TEST mp_reduce_2k_l
TEST mp_set_double
TEST mp_signed_rsh
TEST mp_sqrt
999
TEST mp_sqrtmod_prime
TEST mp_xor
TEST s_mp_balance_mul
TEST s_mp_karatsuba_mul
TEST s_mp_karatsuba_sqr
TEST s_mp_toom_mul
TEST s_mp_toom_sqr
Tests OK/NOP/FAIL: 42/0/0
```
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