57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/*
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* Copyright (C) 2024 BayLibre SAS
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include <zephyr/types.h>
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#include <errno.h>
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#include <zephyr/data/jwt.h>
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#include <zephyr/data/json.h>
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#include <mbedtls/pk.h>
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#include <mbedtls/rsa.h>
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#include <mbedtls/sha256.h>
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#include <zephyr/random/random.h>
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#include "jwt.h"
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static int csprng_wrapper(void *ctx, unsigned char *dest, size_t size)
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{
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ARG_UNUSED(ctx);
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return sys_csrand_get((void *)dest, size);
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}
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int jwt_sign_impl(struct jwt_builder *builder, const unsigned char *der_key, size_t der_key_len,
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unsigned char *sig, size_t sig_size)
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{
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int res;
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mbedtls_pk_context ctx;
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size_t sig_len_out;
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mbedtls_pk_init(&ctx);
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res = mbedtls_pk_parse_key(&ctx, der_key, der_key_len, NULL, 0, csprng_wrapper, NULL);
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if (res != 0) {
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return res;
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}
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uint8_t hash[32];
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/*
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* The '0' indicates to mbedtls to do a SHA256, instead of
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* 224.
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*/
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res = mbedtls_sha256(builder->base, builder->buf - builder->base, hash, 0);
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if (res != 0) {
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return res;
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}
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res = mbedtls_pk_sign(&ctx, MBEDTLS_MD_SHA256, hash, sizeof(hash), sig, sig_size,
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&sig_len_out, csprng_wrapper, NULL);
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return res;
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}
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