circuitpython/ports/raspberrypi/common-hal/hashlib/Hash.c

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2022-10-13 21:42:35 -04:00
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2022 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "shared-bindings/hashlib/Hash.h"
#include "mbedtls/ssl.h"
void common_hal_hashlib_hash_update(hashlib_hash_obj_t *self, const uint8_t *data, size_t datalen) {
if (self->hash_type == MBEDTLS_SSL_HASH_SHA1) {
mbedtls_sha1_update_ret(&self->sha1, data, datalen);
return;
}
}
void common_hal_hashlib_hash_digest(hashlib_hash_obj_t *self, uint8_t *data, size_t datalen) {
if (datalen < common_hal_hashlib_hash_get_digest_size(self)) {
return;
}
if (self->hash_type == MBEDTLS_SSL_HASH_SHA1) {
// We copy the sha1 state so we can continue to update if needed or get
// the digest a second time.
mbedtls_sha1_context copy;
mbedtls_sha1_clone(&copy, &self->sha1);
mbedtls_sha1_finish_ret(&self->sha1, data);
mbedtls_sha1_clone(&self->sha1, &copy);
}
}
size_t common_hal_hashlib_hash_get_digest_size(hashlib_hash_obj_t *self) {
if (self->hash_type == MBEDTLS_SSL_HASH_SHA1) {
return 20;
}
return 0;
}