78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
#include "./openssl.h"
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#include "./opensslrandomdevice.h"
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#include <c++utilities/conversion/binaryconversion.h>
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#include <openssl/conf.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/sha.h>
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#include <random>
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/*!
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* \brief Contains utility classes and functions.
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*/
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namespace Util {
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/*!
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* \brief Contains functions utilizing the usage of OpenSSL.
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*/
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namespace OpenSsl {
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static_assert(Sha256Sum::size == SHA256_DIGEST_LENGTH, "SHA-256 sum fits into Sha256Sum struct");
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/*!
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* \brief Initializes OpenSSL.
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*/
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void init()
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{
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// load the human readable error strings for libcrypto
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ERR_load_crypto_strings();
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// load all digest and cipher algorithms
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OpenSSL_add_all_algorithms();
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}
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/*!
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* \brief Cleans resources of OpenSSL.
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*/
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void clean()
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{
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// removes all digests and ciphers
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EVP_cleanup();
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// remove error strings
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ERR_free_strings();
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}
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/*!
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* \brief Computes a SHA-256 sum using OpenSSL.
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*/
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Sha256Sum computeSha256Sum(const unsigned char *buffer, std::size_t size)
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{
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// init sha256 hashing
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SHA256_CTX sha256;
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SHA256_Init(&sha256);
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// do the actual hashing
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SHA256_Update(&sha256, buffer, size);
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// finalize the hashing
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Sha256Sum hash;
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SHA256_Final(hash.data, &sha256);
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return hash;
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}
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/*!
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* \brief Generates a random number using OpenSSL.
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*/
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uint32_t generateRandomNumber(uint32_t min, uint32_t max)
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{
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OpenSslRandomDevice dev;
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std::default_random_engine rng(dev());
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std::uniform_int_distribution<uint32_t> dist(min, max);
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return dist(rng);
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}
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} // namespace OpenSsl
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} // namespace Util
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