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Questions tagged [libgcrypt]

73 questions
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How to read RSA private key from file using a GPLv2 compatible library?

I need to do some RSA decryption and my private key is stored in a file. I am using C++. At first I used OpenSSL, and it worked smoothly, but then the licensing problem appeared, as I want my code to be GPLv2 compatible. Now I am trying to use…
simm
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Mac OS C/C++ include issue

I recently installed libgcrypt from Gnu, but even with it inside my /usr/include and /usr/local/include directories I cannot compile a C++ file that includes it. It can't seem to locate the file, despite the fact that I have it in the correct…
noahbkim
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Is there any way to represent 4 byte number as a 16 byte number?

I have to encrypt some data using a 4 byte IV. However, the encryption algorithm that I am using (AES128)needs a 16 byte (128 bit) key. Say, my code is as follows: #include void encrypt(){ int IV = 6174; gcry_cipher_hd_t hd; …
TheRookierLearner
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Error(s) generating password

I am using PBKDF2 to generate a key from a password using SHA-256 int genKeyFromPass() { int i; void *pwd, *salt = "someRandomSalt"; unsigned char keyBuffer[16]; size_t saltLen, keySize = 16; gpg_error_t errStatus; …
TheRookierLearner
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Comparing gcrypt MD5 outputs to a existing hash

I been given an MD5 output (a 16 byte hex string) and I need to figure out what the message used to make the hash was. I want to compare it with the output of gcrypts gcry_md_hash_buffer(), but I'm sure how to declare it in such a way that strcmp()…
user3056261
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What is libgcrypt doing different when calling the aes128 cipher with a 256bit key?

This is a continuation of my previous question (RSA Decryption). Edit: The answer below was clear and concise. I've added some sample code below which has helped me verify what I think is happening. I will test today and post back. The client…
TheBrian
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How do I decrypt an AES key using C# Bouncy Castle that was encrypted using Libgcrypt raw flag

Summary: I am attempting to decrypt (and eventually encrypt and return) files that are AES128 encrypted. The AES key is encrypted using libcrypt's RSA provider. When I attempt to decrypt the AESKey on Windows 7 using C# & BouncyCastle a "block…
TheBrian
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libgcrypt secure memory

From the libgcrypt manual: Libgcrypt uses a concept known as secure memory, which is a region of memory set aside for storing sensitive data. Because such memory is a scarce resource, it needs to be setup in advanced to a fixed size. Further,…
polslinux
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gnutls configure error: checking for libgcrypt... no

I configured and compiled libgpg-error and libgcrypt but could not install(make install) as i donot have the root permissions. When I try to configure libgnutls, i get this error. tactuser@eqhttd01:gnutls-2.10.0 >./configure…
user862833
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Memory leak in a program with Libgcrypt

I am doing some tests with Libgcrypt and when I use valgrind to check the memory usage there is 3,200 bytes in use at exit. I have tried to use valgrind --leak-check=full --track-origins=yes --show-reachable=yes ./my_program But valgrind valgrind…
Tiago Queiroz
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sign with libgcrypt, crashes

im trying to create a peer to peer network that is controlled by a peer with the master private key, part of that is approving peers to connect the following code is suppose to take a public key, sign that and send it to the peer so that it can…
Gabriel Lambert
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c aes256 padding with pkcs#7 standard

encrypt: while(!feof(fp)){ memset(plain_text, 0, sizeof(plain_text)); retval = fread(plain_text, 1, 16, fp); if(!retval) break; for(i=0; i<16; i++){ if(plain_text[i] == 0){ for(j=i; j<16; j++){ …
polslinux
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Is libgcrypt thread-safe?

Is library libgcrypt thread-safe one? In case that I don't divide resources of this library between threads, but create different context in every thread. C++ programming language.
user3107137
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