Re: [cryptopp-users] Re: Retrieving public key from x and y
On Tue, Sep 21, 2021 at 10:40 AM Jeffrey Walton wrote: > ... > Typically you don't simply encrypt with an elliptic curve. Typically > encryption using elliptic curves is a hybrid public key encryption > scheme, like ECIES. In ECIES, you encrypt a bulk encryption key for a > block cipher like AES under the public key. But even that is slippery > since you don't really encrypt like with RSA. Rather, you use a key > agreement scheme and the person doing the encryption performs half of > the key exchange using a temporary key and the other party's public > key. The other party with the private key performs the other half of > the key agreement, recovers the bulk encryption key, and then uses a > block cipher like AES to decrypt the actual message. I don't mean to beat a dead horse, but here's what the wikipedia article on EC says (https://en.wikipedia.org/wiki/Elliptic-curve_cryptography): Elliptic curves are applicable for key agreement, digital signatures, pseudo-random generators and other tasks. Indirectly, they can be used for encryption by combining the key agreement with a symmetric encryption scheme. So it is not just simple encryption like RSA. > But getting back to your problem... Do you know which JSON algorithm > you are using? I should have restated... The algorithms are listed in RFC 7518, Section 4.1. If you are dealing with some sort of custom scheme, do you have a link to the specification and test vectors? Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8nnJVtLQZB9_V7PJ4XJfWR%3D3SoTa5pgJVnOOd%3Drua87tQ%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Tue, Sep 21, 2021 at 9:54 AM Benjamin Schäfer wrote: > > In the end it could be broke down to: I want to encrypt a std::string (the > JSON Web Token) with the public key I created out of x and y with crypto++. I > will take a look into OpenSSL and what I could do with that, but this project > seems to get out of hand. OK, so based on RFC 7516, they provide an example of public key encryption using RSA/OAEP. That's what we show on our wiki page. However, in RFC 7518 (https://datatracker.ietf.org/doc/html/rfc7518#section-4.1), the IETF lists a boat load of other algorithms. But I don't see a "EC-ES256" or similar that would indicate public key encryption using P-256. Typically you don't simply encrypt with an elliptic curve. Typically encryption using elliptic curves is a hybrid public key encryption scheme, like ECIES. In ECIES, you encrypt a bulk encryption key for a block cipher like AES under the public key. But even that is slippery since you don't really encrypt like with RSA. Rather, you use a key agreement scheme and the person doing the encryption performs half of the key exchange using a temporary key and the other party's public key. The other party with the private key performs the other half of the key agreement, recovers the bulk encryption key, and then uses a block cipher like AES to decrypt the actual message. But getting back to your problem... Do you know which JSON algorithm you are using? Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8nMYsqVpR72nO49qGx4Tqqb9CmW0g9ZkK1iXT8Jg52HKg%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
In the end it could be broke down to: I want to encrypt a std::string (the JSON Web Token) with the public key I created out of x and y with crypto++. I will take a look into OpenSSL and what I could do with that, but this project seems to get out of hand. Jeffrey Walton schrieb am Dienstag, 21. September 2021 um 14:35:43 UTC+2: > > How can I "convert" the public key I got from > > > > CryptoPP::ECDSA::PublicKey publicKey; > > publicKey.Initialize(CryptoPP::ASN1::brainpoolP256r1(), q); > > > > to the needed byte array. What do I have to use as initialisation > vector? I'm no pro in crypto-algorithms but I have to use them for a > specific project -_- > > Sorry, I'm not sure what you need. I'm not familiar with cpp-jwt. > > Maybe it would be easier to add Brainpool support to cpp-jwt. Then you > won't need to use other libraries. cpp-jwt will do everything you > need. > > cpp-jwt uses OpenSSL for its cryptography. It should be relatively > easy to add the support. > > Jeff > -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/5e15462e-3cd7-4d54-8088-5af5de801619n%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
> How can I "convert" the public key I got from > > CryptoPP::ECDSA::PublicKey publicKey; > publicKey.Initialize(CryptoPP::ASN1::brainpoolP256r1(), q); > > to the needed byte array. What do I have to use as initialisation vector? I'm > no pro in crypto-algorithms but I have to use them for a specific project -_- Sorry, I'm not sure what you need. I'm not familiar with cpp-jwt. Maybe it would be easier to add Brainpool support to cpp-jwt. Then you won't need to use other libraries. cpp-jwt will do everything you need. cpp-jwt uses OpenSSL for its cryptography. It should be relatively easy to add the support. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8%3DXGhvfG%2BR_ZYJ_4xS9frjicj2f1izUKK256S%3D4z2BJTg%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
Okay, I've read the articles, but somehow I don't know where to start. I have to use the public key, generated out of x and y, algorith brainpool, to encrypt a JWT. The JWT is generated with the cpp-jwt library and now I really don't know what to do. How can I "convert" the public key I got from CryptoPP::ECDSA::PublicKey publicKey; publicKey.Initialize(CryptoPP::ASN1::brainpoolP256r1(), q); to the needed byte array. What do I have to use as initialisation vector? I'm no pro in crypto-algorithms but I have to use them for a specific project -_- Jeffrey Walton schrieb am Samstag, 18. September 2021 um 15:29:40 UTC+2: > On Fri, Sep 17, 2021 at 11:59 PM Benjamin Schäfer > wrote: > > > > Correction: I have to encrypt the JWT, not sign it. Signing is with the > private key - which I don't have. I will take a look at the article and the > linking. Maybe that will bring some hints for me. Thanks again :) > > This may help if you need to verify signatures: > https://www.cryptopp.com/wiki/JSON_Web_Signature > > Jeff > -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/85cd607f-c650-4326-a883-794fc82a90fdn%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Fri, Sep 17, 2021 at 11:59 PM Benjamin Schäfer wrote: > > Correction: I have to encrypt the JWT, not sign it. Signing is with the > private key - which I don't have. I will take a look at the article and the > linking. Maybe that will bring some hints for me. Thanks again :) This may help if you need to verify signatures: https://www.cryptopp.com/wiki/JSON_Web_Signature Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8kGwJjK13UQ-FwG%3DhxW%2BP95nbEy_tQOu4WZGk60BrnLpg%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
Correction: I have to encrypt the JWT, not sign it. Signing is with the private key - which I don't have. I will take a look at the article and the linking. Maybe that will bring some hints for me. Thanks again :) Jeffrey Walton schrieb am Samstag, 18. September 2021 um 05:11:31 UTC+2: > On Friday, September 17, 2021 at 11:26:25 AM UTC-4 skullm...@gmail.com > wrote: > >> ... The final goal is to build a JWT and sign it with the public key, >> constructed out of x and y. If I can find a way to use the public key >> directly, that may be a workaround of that problem - in the end I don't >> want a temporary file output anyway. It only grinds my gears that it works >> when compiled on "not-my-machine"-devices. >> > > For JWT, see https://www.cryptopp.com/wiki/JSON_Web_Encryption . It > should supply most of the pieces you need for the tokens. > > If the JWE article has gaps that are needed for JWT, we can write an > article specifically for JWT. > > Jeff > -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/8592faec-1ab3-4097-b219-dffd84efae9en%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Friday, September 17, 2021 at 11:26:25 AM UTC-4 skullm...@gmail.com wrote: > ... The final goal is to build a JWT and sign it with the public key, > constructed out of x and y. If I can find a way to use the public key > directly, that may be a workaround of that problem - in the end I don't > want a temporary file output anyway. It only grinds my gears that it works > when compiled on "not-my-machine"-devices. > For JWT, see https://www.cryptopp.com/wiki/JSON_Web_Encryption . It should supply most of the pieces you need for the tokens. If the JWE article has gaps that are needed for JWT, we can write an article specifically for JWT. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/62b26e8e-c133-43dc-9394-9b6c55bf9349n%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Friday, September 17, 2021 at 11:26:25 AM UTC-4 skullm...@gmail.com
wrote:
> This is somehow ridiculus. I just set up a brand new VM with Win10, new
> version. Also installed VS2019 Community. Nothing else, ran the upper
> commands on the content of the 7zip archive and I still get the same
> result. This can't be something with Intel vs. AMD, could it?
>
I don't install an IDE, like {Community|Professional|Enterprise} Edition. I
just install the VS Build Tools. I also install an SDK.
Can you confirm you are using cryptopp Master and crypotpp-pem Master? I
think you said you were using cryptopp Master, but I don't recall seeing
something for crypotpp-pem.
Finally, I assume you are using the same runtime libraries for everything.
Crypto++ uses static linking by default (/MT and MTd). You have to manually
switch to dynamic runtimes (/MD and /MDd). Also see
https://www.cryptopp.com/wiki/Visual_Studio#Runtime_Linking.
Jeff
--
You received this message because you are subscribed to the Google Groups
"Crypto++ Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to cryptopp-users+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/cryptopp-users/14c132d4-173c-4042-8d25-2be1a7b30486n%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
This is somehow ridiculus. I just set up a brand new VM with Win10, new version. Also installed VS2019 Community. Nothing else, ran the upper commands on the content of the 7zip archive and I still get the same result. This can't be something with Intel vs. AMD, could it? Your offer is fantastic, but I'm not that good in SSH access and besides an dxdiag-output, I won't even know what to look for :( At the moment I ran out of ideas. I will sleep about that till monday, maybe there comes a idea around the corner. Maybe I did not need the pem as a file. The final goal is to build a JWT and sign it with the public key, constructed out of x and y. If I can find a way to use the public key directly, that may be a workaround of that problem - in the end I don't want a temporary file output anyway. It only grinds my gears that it works when compiled on "not-my-machine"-devices. First I will try that sleep-thing, it helped me a lot in the past. Again, thank you very much for your help! That helped me that much, that my code itselt can't be that wrong, it stucks somewhere else. Jeffrey Walton schrieb am Freitag, 17. September 2021 um 13:30:34 UTC+2: > On Fri, Sep 17, 2021 at 6:06 AM Jeffrey Walton wrote: > > > > ... > > I've got a Windows 10 VM somewhere. Let me see if I can get closer to > v16.10.1. > > I just tried with my Windows 10 VM. It was OK there, too. > > Do you know how to do something like SSH access on Windows? I'll give > you an account on my machine. You can look around and see what is > different about it. > > Jeff > -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/a09e8145-d786-47d7-8be3-ea6c01517dcan%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Fri, Sep 17, 2021 at 6:06 AM Jeffrey Walton wrote: > > ... > I've got a Windows 10 VM somewhere. Let me see if I can get closer to > v16.10.1. I just tried with my Windows 10 VM. It was OK there, too. Do you know how to do something like SSH access on Windows? I'll give you an account on my machine. You can look around and see what is different about it. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8kwJvQL6NoFs8GihVLnNix4WNY3%2BgvBH8z3-P3r66-_GQ%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Fri, Sep 17, 2021 at 5:11 AM Benjamin Schäfer wrote: > > Your exe works perfectly on my machine. I don't know if that's good or bad... > I only have VS2019 on my machine here, it says: > > ** > ** Visual Studio 2019 Developer Command Prompt v16.10.1 > ** Copyright (c) 2021 Microsoft Corporation > ** > > C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional>cl > Microsoft (R) C/C++-Optimierungscompiler Version 19.29.30037 für x86 > Copyright (C) Microsoft Corporation. Alle Rechte vorbehalten. > > The only thing, I can see here, is that your cl.exe on VS2017 says, it's 64 > bit. I will investigate that too. OK, so I run Windows 8.1 Professional. Regarding v16.9.5 (mine) vs v16.10.1 (yours), I've installed the Windows SDKs and update them periodically. So I have a few SDKs available. I think the Developer Command Prompts use the latest. So it looks like I am behind you a bit. I've got a Windows 10 VM somewhere. Let me see if I can get closer to v16.10.1. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8%3DotFOd%2BZTiuLaH0Oa9C-noP5kZ9A02N9pzS8s0%2BURKbQ%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
Your exe works perfectly on my machine. I only have VS2019 on my machine here, it says: ** ** Visual Studio 2019 Developer Command Prompt v16.10.1 ** Copyright (c) 2021 Microsoft Corporation ** C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional>cl Microsoft (R) C/C++-Optimierungscompiler Version 19.29.30037 für x86 Copyright (C) Microsoft Corporation. Alle Rechte vorbehalten. The only thing, I can see here, is that your cl.exe on VS2017 says, it's 64 bit. I will investigate that too. Jeffrey Walton schrieb am Freitag, 17. September 2021 um 10:58:29 UTC+2: > On Fri, Sep 17, 2021 at 4:32 AM Benjamin Schäfer > wrote: > > > > Could you provide me your .exe to test it on my machine? I still don't > get it and will try it on a fresh and clean machine also. > > Sure. https://www.cryptopp.com/test_pem.exe.zip > > I don't recall if that was built with VS2017 or VS2019. You may need a > specific version of the Visual C++ runtime. They are distributed by > Microsoft. I think you can get them here: > > https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0 > . > > Here are the two versions on my Windows machine: > > VS2017: > ** > ** Visual Studio 2017 Developer Command Prompt v15.0 > ** Copyright (c) 2017 Microsoft Corporation > ** > C:\Users\Jeff>cl.exe > Microsoft (R) C/C++ Optimizing Compiler Version 19.16.27043 for x64 > Copyright (C) Microsoft Corporation. All rights reserved. > > VS2019: > ** > ** Visual Studio 2019 Developer Command Prompt v16.9.5 > ** Copyright (c) 2021 Microsoft Corporation > ** > C:\Users\Jeff>cl.exe > Microsoft (R) C/C++ Optimizing Compiler Version 19.28.29915 for x86 > Copyright (C) Microsoft Corporation. All rights reserved. > > Jeff > -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/698dafdb-df8e-41c9-a20e-90c8428904d0n%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Fri, Sep 17, 2021 at 4:32 AM Benjamin Schäfer wrote: > > Could you provide me your .exe to test it on my machine? I still don't get it > and will try it on a fresh and clean machine also. Sure. https://www.cryptopp.com/test_pem.exe.zip I don't recall if that was built with VS2017 or VS2019. You may need a specific version of the Visual C++ runtime. They are distributed by Microsoft. I think you can get them here: https://support.microsoft.com/en-us/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0 . Here are the two versions on my Windows machine: VS2017: ** ** Visual Studio 2017 Developer Command Prompt v15.0 ** Copyright (c) 2017 Microsoft Corporation ** C:\Users\Jeff>cl.exe Microsoft (R) C/C++ Optimizing Compiler Version 19.16.27043 for x64 Copyright (C) Microsoft Corporation. All rights reserved. VS2019: ** ** Visual Studio 2019 Developer Command Prompt v16.9.5 ** Copyright (c) 2021 Microsoft Corporation ** C:\Users\Jeff>cl.exe Microsoft (R) C/C++ Optimizing Compiler Version 19.28.29915 for x86 Copyright (C) Microsoft Corporation. All rights reserved. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8kQzaskPXmsVF70eHPEYmthmSbd2L-Tc1wT%3DUhMVtbVsg%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
Could you provide me your .exe to test it on my machine? I still don't get it and will try it on a fresh and clean machine also. Benjamin Schäfer schrieb am Donnerstag, 16. September 2021 um 17:50:42 UTC+2: > Well, I tested it on another machine at home, but the result remains the > same :( > > Benjamin Schäfer schrieb am Donnerstag, 16. September 2021 um 13:37:01 > UTC+2: > >> I've put a 7z archive with all file I've used into the repository. On the >> CTL I switched the working directory to the extracted one. Then I ran the >> following commands: >> >> nmake /f cryptest.nmake >> >> cl.exe /nologo /W4 /wd4231 /wd4511 /wd4156 /D_MBCS /Zi /TP /GR /EHsc >> /DNDEBUG /D_NDEBUG /Oi /Oy /O2 /MT /FI sdkddkver.h /FI winapifamily.h /c >> test_Pem.cpp /out:test_pem.obj >> >> link.exe /nologo /SUBSYSTEM:CONSOLE /DEBUG /DEBUG /OPT:REF /MACHINE:X86 >> test_pem.obj cryptlib.lib kernel32.lib /out:test_pem.exe >> >> After executing test_pem.exe, a .pem file appears with the known result. >> >> I will try the same again when I'm at home on a different machine, just >> to be sure, nothing is screwed up on my working machine. >> Benjamin Schäfer schrieb am Donnerstag, 16. September 2021 um 12:02:37 >> UTC+2: >> >>> I just don't get it. Somehow I can't force the platform toolkit to be >>> used. It remains at 140, when I compile with cl.exe. Going to the UI of >>> VS2019, building the library with toolset 142 and cryptolib with 142 >>> produces those results. When I open the CTL of VS2019 and run the cl.exe >>> command, I get vc140.pdb as output. This drives me crazy - being one step >>> away from the goal and can't figure out what's wrong. >>> Jeffrey Walton schrieb am Donnerstag, 16. September 2021 um 11:10:36 >>> UTC+2: >>> On Thu, Sep 16, 2021 at 4:37 AM Benjamin Schäfer wrote: > > First of all: Thank you for your help and your patience! I really appreciate that. > > I've made the same steps with nmake and built the library. Then I did the same steps with my source file you mentioned, everything on the CTL that came with VS2019 (should make no difference). > > I uploaded the files here: > https://github.com/bredator/cryptopptest > > Everything took place in the same directory where the cryptopp .h and .cpp files are located - so I didn't upload them again, because I took them out of the box. Also I added my .pem file, that came out as I reproduced all the steps. You said you are using Visual Studio 2019, but you have a PDB file vc140.pdb. That is Visual Studio 2015. See https://en.wikipedia.org/wiki/Microsoft_Visual_C%2B%2B#Internal_version_numbering. You cannot mix versions of Visual Studio. Everything needs to be built using Visual Studio 2015 or Visual Studio 2019. Jeff >>> -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/a7256eb1-0bae-48b3-9dc2-012a6ebda33bn%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
Well, I tested it on another machine at home, but the result remains the same :( Benjamin Schäfer schrieb am Donnerstag, 16. September 2021 um 13:37:01 UTC+2: > I've put a 7z archive with all file I've used into the repository. On the > CTL I switched the working directory to the extracted one. Then I ran the > following commands: > > nmake /f cryptest.nmake > > cl.exe /nologo /W4 /wd4231 /wd4511 /wd4156 /D_MBCS /Zi /TP /GR /EHsc > /DNDEBUG /D_NDEBUG /Oi /Oy /O2 /MT /FI sdkddkver.h /FI winapifamily.h /c > test_Pem.cpp /out:test_pem.obj > > link.exe /nologo /SUBSYSTEM:CONSOLE /DEBUG /DEBUG /OPT:REF /MACHINE:X86 > test_pem.obj cryptlib.lib kernel32.lib /out:test_pem.exe > > After executing test_pem.exe, a .pem file appears with the known result. > > I will try the same again when I'm at home on a different machine, just to > be sure, nothing is screwed up on my working machine. > Benjamin Schäfer schrieb am Donnerstag, 16. September 2021 um 12:02:37 > UTC+2: > >> I just don't get it. Somehow I can't force the platform toolkit to be >> used. It remains at 140, when I compile with cl.exe. Going to the UI of >> VS2019, building the library with toolset 142 and cryptolib with 142 >> produces those results. When I open the CTL of VS2019 and run the cl.exe >> command, I get vc140.pdb as output. This drives me crazy - being one step >> away from the goal and can't figure out what's wrong. >> Jeffrey Walton schrieb am Donnerstag, 16. September 2021 um 11:10:36 >> UTC+2: >> >>> On Thu, Sep 16, 2021 at 4:37 AM Benjamin Schäfer >>> wrote: >>> > >>> > First of all: Thank you for your help and your patience! I really >>> appreciate that. >>> > >>> > I've made the same steps with nmake and built the library. Then I did >>> the same steps with my source file you mentioned, everything on the CTL >>> that came with VS2019 (should make no difference). >>> > >>> > I uploaded the files here: >>> > https://github.com/bredator/cryptopptest >>> > >>> > Everything took place in the same directory where the cryptopp .h and >>> .cpp files are located - so I didn't upload them again, because I took them >>> out of the box. Also I added my .pem file, that came out as I reproduced >>> all the steps. >>> >>> You said you are using Visual Studio 2019, but you have a PDB file >>> vc140.pdb. That is Visual Studio 2015. See >>> >>> https://en.wikipedia.org/wiki/Microsoft_Visual_C%2B%2B#Internal_version_numbering. >>> >>> >>> >>> You cannot mix versions of Visual Studio. Everything needs to be built >>> using Visual Studio 2015 or Visual Studio 2019. >>> >>> Jeff >>> >> -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/ac3dcbd2-25be-48a9-8fea-a2ee4c67a06an%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
I've put a 7z archive with all file I've used into the repository. On the CTL I switched the working directory to the extracted one. Then I ran the following commands: nmake /f cryptest.nmake cl.exe /nologo /W4 /wd4231 /wd4511 /wd4156 /D_MBCS /Zi /TP /GR /EHsc /DNDEBUG /D_NDEBUG /Oi /Oy /O2 /MT /FI sdkddkver.h /FI winapifamily.h /c test_Pem.cpp /out:test_pem.obj link.exe /nologo /SUBSYSTEM:CONSOLE /DEBUG /DEBUG /OPT:REF /MACHINE:X86 test_pem.obj cryptlib.lib kernel32.lib /out:test_pem.exe After executing test_pem.exe, a .pem file appears with the known result. I will try the same again when I'm at home on a different machine, just to be sure, nothing is screwed up on my working machine. Benjamin Schäfer schrieb am Donnerstag, 16. September 2021 um 12:02:37 UTC+2: > I just don't get it. Somehow I can't force the platform toolkit to be > used. It remains at 140, when I compile with cl.exe. Going to the UI of > VS2019, building the library with toolset 142 and cryptolib with 142 > produces those results. When I open the CTL of VS2019 and run the cl.exe > command, I get vc140.pdb as output. This drives me crazy - being one step > away from the goal and can't figure out what's wrong. > Jeffrey Walton schrieb am Donnerstag, 16. September 2021 um 11:10:36 UTC+2: > >> On Thu, Sep 16, 2021 at 4:37 AM Benjamin Schäfer >> wrote: >> > >> > First of all: Thank you for your help and your patience! I really >> appreciate that. >> > >> > I've made the same steps with nmake and built the library. Then I did >> the same steps with my source file you mentioned, everything on the CTL >> that came with VS2019 (should make no difference). >> > >> > I uploaded the files here: >> > https://github.com/bredator/cryptopptest >> > >> > Everything took place in the same directory where the cryptopp .h and >> .cpp files are located - so I didn't upload them again, because I took them >> out of the box. Also I added my .pem file, that came out as I reproduced >> all the steps. >> >> You said you are using Visual Studio 2019, but you have a PDB file >> vc140.pdb. That is Visual Studio 2015. See >> >> https://en.wikipedia.org/wiki/Microsoft_Visual_C%2B%2B#Internal_version_numbering. >> >> >> >> You cannot mix versions of Visual Studio. Everything needs to be built >> using Visual Studio 2015 or Visual Studio 2019. >> >> Jeff >> > -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/34256ba4-cde8-40d3-bbd0-3bb1fae863aen%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
I just don't get it. Somehow I can't force the platform toolkit to be used. It remains at 140, when I compile with cl.exe. Going to the UI of VS2019, building the library with toolset 142 and cryptolib with 142 produces those results. When I open the CTL of VS2019 and run the cl.exe command, I get vc140.pdb as output. This drives me crazy - being one step away from the goal and can't figure out what's wrong. Jeffrey Walton schrieb am Donnerstag, 16. September 2021 um 11:10:36 UTC+2: > On Thu, Sep 16, 2021 at 4:37 AM Benjamin Schäfer > wrote: > > > > First of all: Thank you for your help and your patience! I really > appreciate that. > > > > I've made the same steps with nmake and built the library. Then I did > the same steps with my source file you mentioned, everything on the CTL > that came with VS2019 (should make no difference). > > > > I uploaded the files here: > > https://github.com/bredator/cryptopptest > > > > Everything took place in the same directory where the cryptopp .h and > .cpp files are located - so I didn't upload them again, because I took them > out of the box. Also I added my .pem file, that came out as I reproduced > all the steps. > > You said you are using Visual Studio 2019, but you have a PDB file > vc140.pdb. That is Visual Studio 2015. See > > https://en.wikipedia.org/wiki/Microsoft_Visual_C%2B%2B#Internal_version_numbering > . > > You cannot mix versions of Visual Studio. Everything needs to be built > using Visual Studio 2015 or Visual Studio 2019. > > Jeff > -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/260b923e-ee85-445b-9aa7-5e23cbd1fcffn%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Thu, Sep 16, 2021 at 4:37 AM Benjamin Schäfer wrote: > I've made the same steps with nmake and built the library. Then I did the > same steps with my source file you mentioned, everything on the CTL that came > with VS2019 (should make no difference). > > I uploaded the files here: > https://github.com/bredator/cryptopptest I need all the files you used, and I need all the commands you executed. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8kjyYPyD%2BuN6X-0OAi4BP9zRCZ067SLB5Lsw_Y0oHL1Sg%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Thu, Sep 16, 2021 at 4:37 AM Benjamin Schäfer wrote: > > First of all: Thank you for your help and your patience! I really appreciate > that. > > I've made the same steps with nmake and built the library. Then I did the > same steps with my source file you mentioned, everything on the CTL that came > with VS2019 (should make no difference). > > I uploaded the files here: > https://github.com/bredator/cryptopptest > > Everything took place in the same directory where the cryptopp .h and .cpp > files are located - so I didn't upload them again, because I took them out of > the box. Also I added my .pem file, that came out as I reproduced all the > steps. You said you are using Visual Studio 2019, but you have a PDB file vc140.pdb. That is Visual Studio 2015. See https://en.wikipedia.org/wiki/Microsoft_Visual_C%2B%2B#Internal_version_numbering. You cannot mix versions of Visual Studio. Everything needs to be built using Visual Studio 2015 or Visual Studio 2019. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8mLJ9fs59Bc88Vur6cVM3g_PEPxMBk1gU%2B5Ued6XrX8jg%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
First of all: Thank you for your help and your patience! I really appreciate that. I've made the same steps with nmake and built the library. Then I did the same steps with my source file you mentioned, everything on the CTL that came with VS2019 (should make no difference). I uploaded the files here: https://github.com/bredator/cryptopptest Everything took place in the same directory where the cryptopp .h and .cpp files are located - so I didn't upload them again, because I took them out of the box. Also I added my .pem file, that came out as I reproduced all the steps. Jeffrey Walton schrieb am Donnerstag, 16. September 2021 um 09:33:26 UTC+2: > On Thu, Sep 16, 2021 at 2:44 AM Benjamin Schäfer > wrote: > > > > Ok, at least this gives me a ray of hope. So, to get rid of any > interfering codelines, I did: > > > > - Start Visual Studio > > - New project (MFC Console, static linked MFC, Multibyte (unicode brings > up the same result) > > My Windows testing looks OK to me. > > I guess you are going to have to put your project somewhere we can see > it, like GitHub. I'll clone it and try to duplicate the issue. > > Here's what I did for Windows testing... I add the PEM source files to > the nmake file: > > $ git diff > diff --git a/cryptest.nmake b/cryptest.nmake > index 1164c25f..3e0bba0c 100644 > --- a/cryptest.nmake > +++ b/cryptest.nmake > @@ -84,7 +84,8 @@ LIB_SRCS = \ > sse_simd.cpp strciphr.cpp tea.cpp tftables.cpp threefish.cpp tiger.cpp \ > tigertab.cpp ttmac.cpp tweetnacl.cpp twofish.cpp vmac.cpp wake.cpp \ > whrlpool.cpp xed25519.cpp xtr.cpp xtrcrypt.cpp xts.cpp zdeflate.cpp \ > - zinflate.cpp zlib.cpp > + zinflate.cpp zlib.cpp \ > + pem_common.cpp pem_read.cpp pem_write.cpp x509cert.cpp > > LIB_OBJS = \ > cryptlib.obj cpu.obj integer.obj 3way.obj adler32.obj algebra.obj \ > @@ -115,7 +116,8 @@ LIB_OBJS = \ > sse_simd.obj strciphr.obj tea.obj tftables.obj threefish.obj tiger.obj \ > tigertab.obj ttmac.obj tweetnacl.obj twofish.obj vmac.obj wake.obj \ > whrlpool.obj xed25519.obj xtr.obj xtrcrypt.obj xts.obj zdeflate.obj \ > - zinflate.obj zlib.obj > + zinflate.obj zlib.obj \ > + pem_common.obj pem_read.obj pem_write.obj x509cert.obj > > ASM_OBJS = \ > rdrand-x86.obj rdrand-x64.obj rdseed-x86.obj rdseed-x64.obj > x64masm.obj x64dll.obj > > Then, from a Developer Prompt, build the library: > > >nmake /f cryptest.nmake > ... > > Build the test program test.cxx: > > cl.exe /nologo /W4 /wd4231 /wd4511 /wd4156 /D_MBCS /Zi /TP /GR /EHsc > /DNDEBUG /D_NDEBUG /Oi /Oy /O2 /MT /FI sdkddkver.h /FI winapifamily.h > /c test.cxx /out:test_pem.obj > > Link the test program: > > link.exe /nologo /SUBSYSTEM:CONSOLE /DEBUG /DEBUG /OPT:REF > /MACHINE:X64 test_pem.obj cryptlib.lib kernel32.lib /out:test_pem.exe > > Run the test program: > > C:\Users\Jeff\Desktop\cryptopp>.\test_pem.exe > > And dump the contents for the PEM file: > > C:\Users\Jeff\Desktop\cryptopp>type pubkey.pem > -BEGIN PUBLIC KEY- > MFowFAYHKoZIzj0CAQYJKyQDAwIIAQEHA0IABEC6Sfy6RcfusiYbG+Drx8FNZIS5 > 74ojsGDr5n+XJSu8mHuknfNkoMmSbytt4br0YGihOixcmBKy80UfSLdXGe4= > -END PUBLIC KEY- > > I used Visual Studio 2017 Command Line Tools (CLT). But just about any > modern version of Visual Studio should produce the same results. In > fact, I use cryptest.nmake to test back to Visual Studio 2003. > > Jeff > -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/57f410e5-c627-419a-9a48-b6b4232db8d0n%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Thu, Sep 16, 2021 at 2:44 AM Benjamin Schäfer wrote: > > Ok, at least this gives me a ray of hope. So, to get rid of any interfering > codelines, I did: > > - Start Visual Studio > - New project (MFC Console, static linked MFC, Multibyte (unicode brings up > the same result) My Windows testing looks OK to me. I guess you are going to have to put your project somewhere we can see it, like GitHub. I'll clone it and try to duplicate the issue. Here's what I did for Windows testing... I add the PEM source files to the nmake file: $ git diff diff --git a/cryptest.nmake b/cryptest.nmake index 1164c25f..3e0bba0c 100644 --- a/cryptest.nmake +++ b/cryptest.nmake @@ -84,7 +84,8 @@ LIB_SRCS = \ sse_simd.cpp strciphr.cpp tea.cpp tftables.cpp threefish.cpp tiger.cpp \ tigertab.cpp ttmac.cpp tweetnacl.cpp twofish.cpp vmac.cpp wake.cpp \ whrlpool.cpp xed25519.cpp xtr.cpp xtrcrypt.cpp xts.cpp zdeflate.cpp \ -zinflate.cpp zlib.cpp +zinflate.cpp zlib.cpp \ +pem_common.cpp pem_read.cpp pem_write.cpp x509cert.cpp LIB_OBJS = \ cryptlib.obj cpu.obj integer.obj 3way.obj adler32.obj algebra.obj \ @@ -115,7 +116,8 @@ LIB_OBJS = \ sse_simd.obj strciphr.obj tea.obj tftables.obj threefish.obj tiger.obj \ tigertab.obj ttmac.obj tweetnacl.obj twofish.obj vmac.obj wake.obj \ whrlpool.obj xed25519.obj xtr.obj xtrcrypt.obj xts.obj zdeflate.obj \ -zinflate.obj zlib.obj +zinflate.obj zlib.obj \ +pem_common.obj pem_read.obj pem_write.obj x509cert.obj ASM_OBJS = \ rdrand-x86.obj rdrand-x64.obj rdseed-x86.obj rdseed-x64.obj x64masm.obj x64dll.obj Then, from a Developer Prompt, build the library: >nmake /f cryptest.nmake ... Build the test program test.cxx: cl.exe /nologo /W4 /wd4231 /wd4511 /wd4156 /D_MBCS /Zi /TP /GR /EHsc /DNDEBUG /D_NDEBUG /Oi /Oy /O2 /MT /FI sdkddkver.h /FI winapifamily.h /c test.cxx /out:test_pem.obj Link the test program: link.exe /nologo /SUBSYSTEM:CONSOLE /DEBUG /DEBUG /OPT:REF /MACHINE:X64 test_pem.obj cryptlib.lib kernel32.lib /out:test_pem.exe Run the test program: C:\Users\Jeff\Desktop\cryptopp>.\test_pem.exe And dump the contents for the PEM file: C:\Users\Jeff\Desktop\cryptopp>type pubkey.pem -BEGIN PUBLIC KEY- MFowFAYHKoZIzj0CAQYJKyQDAwIIAQEHA0IABEC6Sfy6RcfusiYbG+Drx8FNZIS5 74ojsGDr5n+XJSu8mHuknfNkoMmSbytt4br0YGihOixcmBKy80UfSLdXGe4= -END PUBLIC KEY- I used Visual Studio 2017 Command Line Tools (CLT). But just about any modern version of Visual Studio should produce the same results. In fact, I use cryptest.nmake to test back to Visual Studio 2003. Jeff -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to cryptopp-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8%3DdhJa8PMUNdcUSVmZVmYs%2BFmbm1UFRbJhhNK%3DL%3D_c-0Q%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
Ok, at least this gives me a ray of hope. So, to get rid of any interfering
codelines, I did:
- Start Visual Studio
- New project (MFC Console, static linked MFC, Multibyte (unicode brings up
the same result)
Full code:
#include
#include
#include "cryptlib.h"
#include "filters.h"
#include "eccrypto.h"
#include "files.h"
#include "sha.h"
#include "hex.h"
#include "pem.h"
int main()
{
using namespace CryptoPP;
std::string pt =
"40BA49FCBA45C7EEB2261B1BE0EBC7C14D6484B9EF8A23B060EBE67F97252BBC"
"987BA49DF364A0C9926F2B6DE1BAF46068A13A2C5C9812B2F3451F48B75719EE";
HexDecoder decoder;
decoder.Put((byte*)&pt[0], pt.size());
decoder.MessageEnd();
ECP::Point q;
size_t len = decoder.MaxRetrievable();
q.identity = false;
q.x.Decode(decoder, len / 2);
q.y.Decode(decoder, len / 2);
ECDSA::PublicKey pkey;
pkey.Initialize(ASN1::brainpoolP256r1(), q);
FileSink fs("pubkey.pem");
PEM_Save(fs, pkey);
std::cout << "Hello World!\n";
}
But the result remains the same. OpenSSL:
C:\Program Files (x86)\OpenSSL-Win32\bin>openssl ec -in D:\pubkey.pem
-inform PEM -pubin -text
read EC key
unable to load Key
22020:error:0908F066:PEM routines:get_header_and_data:bad end
line:crypto\pem\pem_lib.c:812:
I really hope that I'm just stupid and don't see the obvious and your
code/result speaks exactly for that. But I don't understand what exactly is
going wrong here.
Jeffrey Walton schrieb am Mittwoch, 15. September 2021 um 19:43:23 UTC+2:
> On Wed, Sep 15, 2021 at 12:01 PM Jeffrey Walton wrote:
> >
> > > But my problem afterward (which I didn't mention to this point,
> because I thought it will solve itself when I have a correct y-coordinate)
> is, that if I try to save this public key as PEM, I only get
> > >
> > > -BEGIN PUBLIC KEY-
> > > MFowMFow-END PUBLIC KEY-
> > >
> > > as result. This was also my result with wrong y and failed validation.
>
> Here's what I am seeing with your data. It looks OK to me. I think we
> need to see your program to determine what is going sideways.
>
> $ cat test.cxx
> #include
> #include
>
> #include "cryptlib.h"
> #include "filters.h"
> #include "eccrypto.h"
> #include "osrng.h"
> #include "files.h"
> #include "sha.h"
> #include "hex.h"
>
> #include "pem.h"
>
> int main(int argc, char* argv[])
> {
> using namespace CryptoPP;
>
> std::string pt =
> "40BA49FCBA45C7EEB2261B1BE0EBC7C14D6484B9EF8A23B060EBE67F97252BBC"
> "987BA49DF364A0C9926F2B6DE1BAF46068A13A2C5C9812B2F3451F48B75719EE";
>
> HexDecoder decoder;
> decoder.Put((byte*)&pt[0], pt.size());
> decoder.MessageEnd();
>
> ECP::Point q;
> size_t len = decoder.MaxRetrievable();
>
> q.identity = false;
> q.x.Decode(decoder, len/2);
> q.y.Decode(decoder, len/2);
>
> ECDSA::PublicKey pkey;
> pkey.Initialize(ASN1::brainpoolP256r1(), q);
>
> FileSink fs("pubkey.pem");
> PEM_Save(fs, pkey);
>
> return 0;
> }
>
> And:
>
> $ ./test.exe
> $ cat pubkey.pem
> -BEGIN PUBLIC KEY-
> MFowFAYHKoZIzj0CAQYJKyQDAwIIAQEHA0IABEC6Sfy6RcfusiYbG+Drx8FNZIS5
> 74ojsGDr5n+XJSu8mHuknfNkoMmSbytt4br0YGihOixcmBKy80UfSLdXGe4=
> -END PUBLIC KEY-
>
> And: $ openssl ec -in pubkey.pem -inform PEM -pubin -text
> Public-Key: (256 bit)
> pub:
> 04:40:ba:49:fc:ba:45:c7:ee:b2:26:1b:1b:e0:eb:
> c7:c1:4d:64:84:b9:ef:8a:23:b0:60:eb:e6:7f:97:
> 25:2b:bc:98:7b:a4:9d:f3:64:a0:c9:92:6f:2b:6d:
> e1:ba:f4:60:68:a1:3a:2c:5c:98:12:b2:f3:45:1f:
> 48:b7:57:19:ee
> ASN1 OID: brainpoolP256r1
>
> Jeff
>
--
You received this message because you are subscribed to the Google Groups
"Crypto++ Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to cryptopp-users+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/cryptopp-users/1371df35-09d7-4805-933f-78994f5629dan%40googlegroups.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
On Wed, Sep 15, 2021 at 12:01 PM Jeffrey Walton wrote:
>
> > But my problem afterward (which I didn't mention to this point, because I
> > thought it will solve itself when I have a correct y-coordinate) is, that
> > if I try to save this public key as PEM, I only get
> >
> > -BEGIN PUBLIC KEY-
> > MFowMFow-END PUBLIC KEY-
> >
> > as result. This was also my result with wrong y and failed validation.
Here's what I am seeing with your data. It looks OK to me. I think we
need to see your program to determine what is going sideways.
$ cat test.cxx
#include
#include
#include "cryptlib.h"
#include "filters.h"
#include "eccrypto.h"
#include "osrng.h"
#include "files.h"
#include "sha.h"
#include "hex.h"
#include "pem.h"
int main(int argc, char* argv[])
{
using namespace CryptoPP;
std::string pt =
"40BA49FCBA45C7EEB2261B1BE0EBC7C14D6484B9EF8A23B060EBE67F97252BBC"
"987BA49DF364A0C9926F2B6DE1BAF46068A13A2C5C9812B2F3451F48B75719EE";
HexDecoder decoder;
decoder.Put((byte*)&pt[0], pt.size());
decoder.MessageEnd();
ECP::Point q;
size_t len = decoder.MaxRetrievable();
q.identity = false;
q.x.Decode(decoder, len/2);
q.y.Decode(decoder, len/2);
ECDSA::PublicKey pkey;
pkey.Initialize(ASN1::brainpoolP256r1(), q);
FileSink fs("pubkey.pem");
PEM_Save(fs, pkey);
return 0;
}
And:
$ ./test.exe
$ cat pubkey.pem
-BEGIN PUBLIC KEY-
MFowFAYHKoZIzj0CAQYJKyQDAwIIAQEHA0IABEC6Sfy6RcfusiYbG+Drx8FNZIS5
74ojsGDr5n+XJSu8mHuknfNkoMmSbytt4br0YGihOixcmBKy80UfSLdXGe4=
-END PUBLIC KEY-
And: $ openssl ec -in pubkey.pem -inform PEM -pubin -text
Public-Key: (256 bit)
pub:
04:40:ba:49:fc:ba:45:c7:ee:b2:26:1b:1b:e0:eb:
c7:c1:4d:64:84:b9:ef:8a:23:b0:60:eb:e6:7f:97:
25:2b:bc:98:7b:a4:9d:f3:64:a0:c9:92:6f:2b:6d:
e1:ba:f4:60:68:a1:3a:2c:5c:98:12:b2:f3:45:1f:
48:b7:57:19:ee
ASN1 OID: brainpoolP256r1
Jeff
--
You received this message because you are subscribed to the Google Groups
"Crypto++ Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to cryptopp-users+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8kX0OOrO2KwNGfehzjfY%2BR3tTJ0pAWH58QvFQqpg9TUhQ%40mail.gmail.com.
Re: [cryptopp-users] Re: Retrieving public key from x and y
> But my problem afterward (which I didn't mention to this point, because I
> thought it will solve itself when I have a correct y-coordinate) is, that if
> I try to save this public key as PEM, I only get
>
> -BEGIN PUBLIC KEY-
> MFowMFow-END PUBLIC KEY-
>
> as result. This was also my result with wrong y and failed validation.
Something sounds sideways. We probably need to see your code.
If I had to hazard a guess, I'd say there's something wrong with the
public key. The fields are empty.
The following works as expected for me.
$ cat test.cxx
#include
#include
#include "cryptlib.h"
#include "filters.h"
#include "eccrypto.h"
#include "osrng.h"
#include "files.h"
#include "sha.h"
#include "hex.h"
#include "pem.h"
int main(int argc, char* argv[])
{
using namespace CryptoPP;
AutoSeededRandomPool prng;
ECDSA::PrivateKey skey;
skey.Initialize(prng, ASN1::secp256k1());
ECDSA::PublicKey pkey;
skey.MakePublicKey(pkey);
FileSink fs("pubkey.pem");
PEM_Save(fs, pkey);
return 0;
}
Compiling it:
$ g++ -DNDEBUG -g2 -O3 -fPIC -pthread -pipe test.cxx ./libcryptopp.a -o test.exe
Running it:
$ ./test.exe
$ cat pubkey.pem
-BEGIN PUBLIC KEY-
MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEpqAXeayRz3sez/raCNqrx5dRp9GLrRaP
TmRu7a5OqBiJk7V34UolfNSRsDW6iWGmzlsUFJs4Ui+XYv493sS3ng==
-END PUBLIC KEY-
And cross check with OpenSSL:
$ openssl ec -in pubkey.pem -inform PEM -pubin -text
read EC key
Public-Key: (256 bit)
pub:
04:a6:a0:17:79:ac:91:cf:7b:1e:cf:fa:da:08:da:
ab:c7:97:51:a7:d1:8b:ad:16:8f:4e:64:6e:ed:ae:
4e:a8:18:89:93:b5:77:e1:4a:25:7c:d4:91:b0:35:
ba:89:61:a6:ce:5b:14:14:9b:38:52:2f:97:62:fe:
3d:de:c4:b7:9e
ASN1 OID: secp256k1
Jeff
--
You received this message because you are subscribed to the Google Groups
"Crypto++ Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to cryptopp-users+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/cryptopp-users/CAH8yC8%3DWOYnFe%2BuXqkkd7C%2B-tu4L3-iKnhD91aHEsWG-vDhhiQ%40mail.gmail.com.
