94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/*
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* SPDX-FileCopyrightText: 2017-2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "crypto_hash_sha256.h"
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#include "mbedtls/sha256.h"
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#include <string.h>
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#ifdef MBEDTLS_SHA256_ALT
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/* Wrapper only works if the libsodium context structure can be mapped
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directly to the mbedTLS context structure.
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See extended comments in crypto_hash_sha512_mbedtls.c
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*/
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#error "This wrapper only support standard software mbedTLS SHA"
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#endif
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/* Sanity check that all the context fields have identical sizes
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(this should be more or less given from the SHA256 algorithm)
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Note that the meaning of the fields is *not* all the same. In libsodium, SHA256 'count' is a 64-bit *bit* count. In
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mbedTLS, 'total' is a 2x32-bit *byte* count (count[0] == MSB).
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For this implementation, we don't convert so the libsodium state structure actually holds a binary copy of the
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mbedTLS totals. This doesn't matter inside libsodium's documented API, but would matter if any callers try to use
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the state's bit count.
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*/
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_Static_assert(sizeof(((crypto_hash_sha256_state *)0)->state) == sizeof(((mbedtls_sha256_context *)0)->state), "state mismatch");
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_Static_assert(sizeof(((crypto_hash_sha256_state *)0)->count) == sizeof(((mbedtls_sha256_context *)0)->total), "count mismatch");
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_Static_assert(sizeof(((crypto_hash_sha256_state *)0)->buf) == sizeof(((mbedtls_sha256_context *)0)->buffer), "buf mismatch");
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/* Inline functions to convert between mbedTLS & libsodium
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context structures
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*/
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static void sha256_mbedtls_to_libsodium(crypto_hash_sha256_state *ls_state, const mbedtls_sha256_context *mb_ctx)
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{
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memcpy(&ls_state->count, mb_ctx->total, sizeof(ls_state->count));
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memcpy(ls_state->state, mb_ctx->state, sizeof(ls_state->state));
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memcpy(ls_state->buf, mb_ctx->buffer, sizeof(ls_state->buf));
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}
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static void sha256_libsodium_to_mbedtls(mbedtls_sha256_context *mb_ctx, crypto_hash_sha256_state *ls_state)
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{
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memcpy(mb_ctx->total, &ls_state->count, sizeof(mb_ctx->total));
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memcpy(mb_ctx->state, ls_state->state, sizeof(mb_ctx->state));
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memcpy(mb_ctx->buffer, ls_state->buf, sizeof(mb_ctx->buffer));
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mb_ctx->is224 = 0;
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}
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int
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crypto_hash_sha256_init(crypto_hash_sha256_state *state)
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{
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mbedtls_sha256_context ctx;
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mbedtls_sha256_init(&ctx);
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int ret = mbedtls_sha256_starts_ret(&ctx, 0);
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if (ret != 0) {
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return ret;
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}
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sha256_mbedtls_to_libsodium(state, &ctx);
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return 0;
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}
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int
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crypto_hash_sha256_update(crypto_hash_sha256_state *state,
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const unsigned char *in, unsigned long long inlen)
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{
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mbedtls_sha256_context ctx;
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sha256_libsodium_to_mbedtls(&ctx, state);
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int ret = mbedtls_sha256_update_ret(&ctx, in, inlen);
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if (ret != 0) {
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return ret;
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}
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sha256_mbedtls_to_libsodium(state, &ctx);
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return 0;
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}
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int
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crypto_hash_sha256_final(crypto_hash_sha256_state *state, unsigned char *out)
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{
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mbedtls_sha256_context ctx;
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sha256_libsodium_to_mbedtls(&ctx, state);
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return mbedtls_sha256_finish_ret(&ctx, out);
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}
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int
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crypto_hash_sha256(unsigned char *out, const unsigned char *in,
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unsigned long long inlen)
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{
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return mbedtls_sha256_ret(in, inlen, out, 0);
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}
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