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// SPDX-License-Identifier: GPL-2.0+
/*
* Hash shim layer on MbedTLS Crypto library
*
* Copyright (c) 2024 Linaro Limited
* Author: Raymond Mao <raymond.mao@linaro.org>
*/
#ifndef USE_HOSTCC
#include <cyclic.h>
#endif /* USE_HOSTCC */
#include <u-boot/sha256.h>
const u8 sha256_der_prefix[SHA256_DER_LEN] = {
0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
0x00, 0x04, 0x20
};
void sha256_starts(sha256_context *ctx)
{
mbedtls_sha256_init(ctx);
mbedtls_sha256_starts(ctx, 0);
}
void
sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length)
{
mbedtls_sha256_update(ctx, input, length);
}
void sha256_finish(sha256_context *ctx, uint8_t digest[SHA256_SUM_LEN])
{
mbedtls_sha256_finish(ctx, digest);
mbedtls_sha256_free(ctx);
}
void sha256_csum_wd(const unsigned char *input, unsigned int ilen,
unsigned char *output, unsigned int chunk_sz)
{
sha256_context ctx;
sha256_starts(&ctx);
if (IS_ENABLED(CONFIG_HW_WATCHDOG) || IS_ENABLED(CONFIG_WATCHDOG)) {
const unsigned char *curr = input;
const unsigned char *end = input + ilen;
int chunk;
while (curr < end) {
chunk = end - curr;
if (chunk > chunk_sz)
chunk = chunk_sz;
sha256_update(&ctx, curr, chunk);
curr += chunk;
schedule();
}
} else {
sha256_update(&ctx, input, ilen);
}
sha256_finish(&ctx, output);
}
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