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12e841114d
Adds the support of key derivation using the scheme hkdf. This scheme is defined in rfc5869. Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com> Reviewed-by: Raymond Mao <raymond.mao@linaro.org>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Hash shim layer on MbedTLS Crypto library
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*
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* Copyright (c) 2024 Linaro Limited
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* Author: Raymond Mao <raymond.mao@linaro.org>
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*/
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#ifndef USE_HOSTCC
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#include <cyclic.h>
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#endif /* USE_HOSTCC */
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#include <u-boot/sha256.h>
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#include <mbedtls/md.h>
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#if CONFIG_IS_ENABLED(HKDF_MBEDTLS)
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#include <mbedtls/hkdf.h>
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#endif
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const u8 sha256_der_prefix[SHA256_DER_LEN] = {
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0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
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0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05,
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0x00, 0x04, 0x20
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};
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void sha256_starts(sha256_context *ctx)
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{
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mbedtls_sha256_init(ctx);
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mbedtls_sha256_starts(ctx, 0);
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}
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void
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sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length)
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{
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mbedtls_sha256_update(ctx, input, length);
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}
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void sha256_finish(sha256_context *ctx, uint8_t digest[SHA256_SUM_LEN])
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{
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mbedtls_sha256_finish(ctx, digest);
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mbedtls_sha256_free(ctx);
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}
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int sha256_hmac(const unsigned char *key, int keylen,
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const unsigned char *input, unsigned int ilen,
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unsigned char *output)
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{
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const mbedtls_md_info_t *md;
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md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
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if (!md)
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return MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE;
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return mbedtls_md_hmac(md, key, keylen, input, ilen, output);
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}
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#if CONFIG_IS_ENABLED(HKDF_MBEDTLS)
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int sha256_hkdf(const unsigned char *salt, int saltlen,
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const unsigned char *ikm, int ikmlen,
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const unsigned char *info, int infolen,
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unsigned char *output, int outputlen)
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{
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const mbedtls_md_info_t *md;
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md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
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if (!md)
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return MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE;
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return mbedtls_hkdf(md, salt, saltlen,
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ikm, ikmlen,
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info, infolen,
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output, outputlen);
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}
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#endif
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