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Questions tagged [libgcrypt]

73 questions
7
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2 answers

Cross-compile to static lib (libgcrypt) for use on iOS

I have downloaded latest libgcrypt & libgpg-error libraries from https://www.gnupg.org/download/index.html. I have successfully built (command line) both libraries using ./configure --enable-static --disable-shared; make ; make install on my Mac…
Chris Heimark
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1 answer

aes-gcm using libgcrypt api in C

I'm playing with libgcrypt (v1.6.1 on Gentoo x64) and i've already implemented (and tested thorugh the AEs test vectors) aes256-cbc and aes256-ctr. Now i am looking at aes256-gcm but i have some doubt about the workflow. Below there is a skeleton of…
polslinux
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1 answer

How does libgcrypt increment the counter for CTR mode?

I have a file encrypted with AES-256 using libgcrypt's CTR mode implementation. I want to be able to decrypt the file in parts (e.g. decrypting blocks 5-10 out of 20 blocks without decrypting the whole file). I know that by using CTR mode, I should…
E1adi
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Enabling FIPS causes libgcrypt error

I have two CentOS 6.7 machines (server A and B). Same package versions are installed on each system. Last week I enabled the openSSH FIPS 140-2 module on Server A, and that system works flawlessly (including tsql queries to a SQL Server instance).…
a coder
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4
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1 answer

Compiling libgcrypt and libgpgerror for Android with Cmake

For some code that has to be implemented in C(++) I need cryptographic functions like AES and 3DES en-/decryption. As openssl isn't an option for the Playstore anymore, so I had to choose a different library. My choice was libgcrypt. Now I struggle…
nidomiro
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4
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1 answer

Data loss when encrypting and decrypting using libgcrypt and Elgamal

I am using Libgcrypt with Elgamal to encrypt a block of bytes, and I am having 2 problems: When I do not use padding and my block of bytes starts which an zero byte, I lose the first byte during decryption; If I use padding the encryption works…
Tiago Queiroz
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2 answers

Unresolved external symbol in libgcrypt.lib

What I have to do if i found Unresolved external symbol in .lib(library) file. If I found unresolved external symbol in .c or .cpp I can fix it. But when i found Unresolved external symbol in .lib(library) file how can i solve this? In my case i…
Myanju
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3 answers

Encrypting a file from a password using libgcrypt

I'm developing simple software that does aes256-cbc encryption of a file. I'm using GNU/Linux and libgcrypt-1.5.0. The IV is randomly generated with the OpenSSL rand function and the IV is stored before the ciphertext in the output file. I'm using…
polslinux
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2
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2 answers

C and libgcrypt. Str to type gcry_error_t. Then add

I am trying to convert a number in a string "255" to type gcry_mpi_t. gcry_mpi_dump show me 323535 and than gcry_mpi_add and gcry_mpi_print(GCRYMPI_FMT_USG... ) doesn't work normal. #include #include #include #include…
c0nn3ct
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How can we add pkcs1 padding for RSA encryption using libgcrypt?

I am trying to encrypt a string with RSA public key using libgcrypt. Its selftest_encr_1024 sample shows most of the things, but it does not show us how to handle padding. This is the code I wrote trying to add PKCS#1 type 2 padding, but it does not…
Harunobu Oyama
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3 answers

Libgcrypt in C returning 42

I would like to preface this with, I am new to C and especially using a lib as large as libgcrypt, so if it is something incredibly simple please be understanding. So, I have been trying to just encrypt some text just to kinda launchpad from and so…
Sean Mitchell
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Which is the best way to get *secure* input from user in C?

I'm developing a kind-of secure password manager. It won't be for professional use, and I know it won't be as secure as KeePass or anything. This is just for my own understanding of how to allocate secure memory, using crypto-algorithms etc. For…
KillPinguin
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AES128 encrypt/decrypt using gcrypt in c++

i couldnt find a working good example so ive created one you can change mykey ,and make the iv random using one of the gcrypt function. sample #include #include typedef unsigned char byte; using namespace std; #define BLOCK…
e.z.a
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Error using gcrypt on function gcry_cipher_encrypt C++

I'm trying to use gcrypt to make a simple cryptography a txt file. When I executes the command gcry_cipher_encrypt i receive the follow errors: gcry_strsource => User defined source 1 gcry_strerror => Invalid length This occurs when I use the…
Juliano Oliveira
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Strip AES padding during fread/fwrite

I'm using libgcrypt to encrypt and decrypt files. When I take in the proper amount of bytes using fread, I need to pad it with 16-n bytes in order for it to properly be encrypted by gcry_cipher_encrypt. Upon decryption however, the null…
Chirality
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