squawk/qomemo/signal/crypto/sha512_digest_openssl.cpp

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/*
* Created by victoria on 2021-05-13.
*/
#include "sha512_digest_openssl.h"
extern "C" {
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/sha.h>
}
using namespace Signal::Crypto;
int Sha512::init(void **digest_context, void *) {
auto ctx = EVP_MD_CTX_create();
if (!ctx) {
return SG_ERR_NOMEM;
}
auto result = EVP_DigestInit_ex(ctx, EVP_sha512(), nullptr);
if (result == 1) {
*digest_context = ctx;
return SG_SUCCESS;
}
EVP_MD_CTX_destroy(ctx);
return SG_ERR_UNKNOWN;
}
int Sha512::update(void *digest_context, const uint8_t *data, size_t data_len, void *) {
auto ctx = static_cast<EVP_MD_CTX *>(digest_context);
auto result = EVP_DigestUpdate(ctx, data, data_len);
return (result == 1) ? SG_SUCCESS : SG_ERR_UNKNOWN;
}
int Sha512::final(void *digest_context, signal_buffer **output, void *) {
auto ctx = static_cast<EVP_MD_CTX *>(digest_context);
unsigned char md[EVP_MAX_MD_SIZE];
unsigned int len = 0;
auto result = EVP_DigestFinal_ex(ctx, md, &len);
if (result != 1) {
return SG_ERR_UNKNOWN;
}
result = EVP_DigestInit_ex(ctx, EVP_sha512(), nullptr);
if (result != 1) {
return SG_ERR_UNKNOWN;
}
signal_buffer *output_buffer = signal_buffer_create(md, len);
if (!output_buffer) {
return SG_ERR_NOMEM;
}
*output = output_buffer;
return SG_SUCCESS;
}
void Sha512::cleanup(void *digest_context, void *) {
auto ctx = static_cast<EVP_MD_CTX *>(digest_context);
EVP_MD_CTX_destroy(ctx);
}