acff3c9c59
* Only direct invocation of cypto_hash_sha256 & crypto_hash_sha512 produced correct output. * Some remaining header file mixups, so changed approach to wrapping the state structures. * Fixes https://github.com/espressif/esp-idf/issues/1044 (crypto_sign problems) * Add option to disable mbedTLS implementation for SHA256 & SHA512 in libsodium
102 lines
3.8 KiB
C
102 lines
3.8 KiB
C
// Copyright 2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "crypto_hash_sha512.h"
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#include "mbedtls/sha512.h"
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#include <string.h>
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#ifdef MBEDTLS_SHA512_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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For ESP32 hardware SHA, the problems are fitting all the data in
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the libsodium state structure, and also that libsodium doesn't
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have mbedtls_sha512_free() or mbedtls_sha512_clone() so we can't
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manage the hardware state in a clean way.
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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 SHA512 algorithm)
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Note that the meaning of the fields is *not* all the same. In libsodium,
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SHA512 'count' is a 2xuin64_t *bit* count where count[0] == MSB. In mbedTLS,
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SHA512 'total' is a 2xuint64_t *byte* count where count[0] == LSB.
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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_sha512_state *)0)->state) == sizeof(((mbedtls_sha512_context *)0)->state), "state mismatch");
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_Static_assert(sizeof(((crypto_hash_sha512_state *)0)->count) == sizeof(((mbedtls_sha512_context *)0)->total), "count mismatch");
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_Static_assert(sizeof(((crypto_hash_sha512_state *)0)->buf) == sizeof(((mbedtls_sha512_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 sha512_mbedtls_to_libsodium(crypto_hash_sha512_state *ls_state, const mbedtls_sha512_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 sha512_libsodium_to_mbedtls(mbedtls_sha512_context *mb_ctx, crypto_hash_sha512_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->is384 = 0;
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}
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int
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crypto_hash_sha512_init(crypto_hash_sha512_state *state)
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{
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mbedtls_sha512_context ctx;
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mbedtls_sha512_init(&ctx);
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mbedtls_sha512_starts(&ctx, 0);
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sha512_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_sha512_update(crypto_hash_sha512_state *state,
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const unsigned char *in, unsigned long long inlen)
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{
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mbedtls_sha512_context ctx;
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sha512_libsodium_to_mbedtls(&ctx, state);
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mbedtls_sha512_update(&ctx, in, inlen);
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sha512_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_sha512_final(crypto_hash_sha512_state *state, unsigned char *out)
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{
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mbedtls_sha512_context ctx;
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sha512_libsodium_to_mbedtls(&ctx, state);
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mbedtls_sha512_finish(&ctx, out);
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return 0;
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}
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int
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crypto_hash_sha512(unsigned char *out, const unsigned char *in,
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unsigned long long inlen)
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{
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mbedtls_sha512(in, inlen, out, 0);
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return 0;
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}
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