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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/cal/hash.h>
#include <aws/cal/private/opensslcrypto_common.h>
#include <openssl/evp.h>
#include <openssl/sha.h>
static void s_destroy(struct aws_hash *hash);
static int s_update(struct aws_hash *hash, const struct aws_byte_cursor *to_hash);
static int s_finalize(struct aws_hash *hash, struct aws_byte_buf *output);
static struct aws_hash_vtable s_md5_vtable = {
.destroy = s_destroy,
.update = s_update,
.finalize = s_finalize,
.alg_name = "MD5",
.provider = "OpenSSL Compatible libcrypto",
};
static struct aws_hash_vtable s_sha256_vtable = {
.destroy = s_destroy,
.update = s_update,
.finalize = s_finalize,
.alg_name = "SHA256",
.provider = "OpenSSL Compatible libcrypto",
};
static void s_destroy(struct aws_hash *hash) {
if (hash == NULL) {
return;
}
EVP_MD_CTX *ctx = hash->impl;
if (ctx != NULL) {
g_aws_openssl_evp_md_ctx_table->free_fn(ctx);
}
aws_mem_release(hash->allocator, hash);
}
struct aws_hash *aws_md5_default_new(struct aws_allocator *allocator) {
struct aws_hash *hash = aws_mem_acquire(allocator, sizeof(struct aws_hash));
if (!hash) {
return NULL;
}
hash->allocator = allocator;
hash->vtable = &s_md5_vtable;
hash->digest_size = AWS_MD5_LEN;
EVP_MD_CTX *ctx = g_aws_openssl_evp_md_ctx_table->new_fn();
hash->impl = ctx;
hash->good = true;
if (!hash->impl) {
s_destroy(hash);
aws_raise_error(AWS_ERROR_OOM);
return NULL;
}
if (!g_aws_openssl_evp_md_ctx_table->init_ex_fn(ctx, EVP_md5(), NULL)) {
s_destroy(hash);
aws_raise_error(AWS_ERROR_UNKNOWN);
return NULL;
}
return hash;
}
struct aws_hash *aws_sha256_default_new(struct aws_allocator *allocator) {
struct aws_hash *hash = aws_mem_acquire(allocator, sizeof(struct aws_hash));
if (!hash) {
return NULL;
}
hash->allocator = allocator;
hash->vtable = &s_sha256_vtable;
hash->digest_size = AWS_SHA256_LEN;
EVP_MD_CTX *ctx = g_aws_openssl_evp_md_ctx_table->new_fn();
hash->impl = ctx;
hash->good = true;
if (!hash->impl) {
s_destroy(hash);
aws_raise_error(AWS_ERROR_OOM);
return NULL;
}
if (!g_aws_openssl_evp_md_ctx_table->init_ex_fn(ctx, EVP_sha256(), NULL)) {
s_destroy(hash);
aws_raise_error(AWS_ERROR_UNKNOWN);
return NULL;
}
return hash;
}
static int s_update(struct aws_hash *hash, const struct aws_byte_cursor *to_hash) {
if (!hash->good) {
return aws_raise_error(AWS_ERROR_INVALID_STATE);
}
EVP_MD_CTX *ctx = hash->impl;
if (AWS_LIKELY(g_aws_openssl_evp_md_ctx_table->update_fn(ctx, to_hash->ptr, to_hash->len))) {
return AWS_OP_SUCCESS;
}
hash->good = false;
return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
}
static int s_finalize(struct aws_hash *hash, struct aws_byte_buf *output) {
if (!hash->good) {
return aws_raise_error(AWS_ERROR_INVALID_STATE);
}
EVP_MD_CTX *ctx = hash->impl;
size_t buffer_len = output->capacity - output->len;
if (buffer_len < hash->digest_size) {
return aws_raise_error(AWS_ERROR_SHORT_BUFFER);
}
if (AWS_LIKELY(g_aws_openssl_evp_md_ctx_table->final_ex_fn(
ctx, output->buffer + output->len, (unsigned int *)&buffer_len))) {
output->len += buffer_len;
hash->good = false;
return AWS_OP_SUCCESS;
}
hash->good = false;
return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
}
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