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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>
#ifndef AWS_BYO_CRYPTO
extern struct aws_hash *aws_sha256_default_new(struct aws_allocator *allocator);
extern struct aws_hash *aws_md5_default_new(struct aws_allocator *allocator);
static aws_hash_new_fn *s_sha256_new_fn = aws_sha256_default_new;
static aws_hash_new_fn *s_md5_new_fn = aws_md5_default_new;
#else
static struct aws_hash *aws_hash_new_abort(struct aws_allocator *allocator) {
(void)allocator;
abort();
}
static aws_hash_new_fn *s_sha256_new_fn = aws_hash_new_abort;
static aws_hash_new_fn *s_md5_new_fn = aws_hash_new_abort;
#endif
struct aws_hash *aws_sha256_new(struct aws_allocator *allocator) {
return s_sha256_new_fn(allocator);
}
struct aws_hash *aws_md5_new(struct aws_allocator *allocator) {
return s_md5_new_fn(allocator);
}
void aws_set_md5_new_fn(aws_hash_new_fn *fn) {
s_md5_new_fn = fn;
}
void aws_set_sha256_new_fn(aws_hash_new_fn *fn) {
s_sha256_new_fn = fn;
}
void aws_hash_destroy(struct aws_hash *hash) {
hash->vtable->destroy(hash);
}
int aws_hash_update(struct aws_hash *hash, const struct aws_byte_cursor *to_hash) {
return hash->vtable->update(hash, to_hash);
}
int aws_hash_finalize(struct aws_hash *hash, struct aws_byte_buf *output, size_t truncate_to) {
if (truncate_to && truncate_to < hash->digest_size) {
size_t available_buffer = output->capacity - output->len;
if (available_buffer < truncate_to) {
return aws_raise_error(AWS_ERROR_SHORT_BUFFER);
}
uint8_t tmp_output[128] = {0};
AWS_ASSERT(sizeof(tmp_output) >= hash->digest_size);
struct aws_byte_buf tmp_out_buf = aws_byte_buf_from_array(tmp_output, sizeof(tmp_output));
tmp_out_buf.len = 0;
if (hash->vtable->finalize(hash, &tmp_out_buf)) {
return AWS_OP_ERR;
}
memcpy(output->buffer + output->len, tmp_output, truncate_to);
output->len += truncate_to;
return AWS_OP_SUCCESS;
}
return hash->vtable->finalize(hash, output);
}
static inline int compute_hash(
struct aws_hash *hash,
const struct aws_byte_cursor *input,
struct aws_byte_buf *output,
size_t truncate_to) {
if (!hash) {
return AWS_OP_ERR;
}
if (aws_hash_update(hash, input)) {
aws_hash_destroy(hash);
return AWS_OP_ERR;
}
if (aws_hash_finalize(hash, output, truncate_to)) {
aws_hash_destroy(hash);
return AWS_OP_ERR;
}
aws_hash_destroy(hash);
return AWS_OP_SUCCESS;
}
int aws_md5_compute(
struct aws_allocator *allocator,
const struct aws_byte_cursor *input,
struct aws_byte_buf *output,
size_t truncate_to) {
return compute_hash(aws_md5_new(allocator), input, output, truncate_to);
}
int aws_sha256_compute(
struct aws_allocator *allocator,
const struct aws_byte_cursor *input,
struct aws_byte_buf *output,
size_t truncate_to) {
return compute_hash(aws_sha256_new(allocator), input, output, truncate_to);
}
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