mirror of
https://github.com/openssl/openssl.git
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84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
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/*
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* Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "internal/quic_srt_gen.h"
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#include <openssl/core_names.h>
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#include <openssl/evp.h>
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struct quic_srt_gen_st {
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EVP_MAC *mac;
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EVP_MAC_CTX *mac_ctx;
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};
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/*
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* Simple HMAC-SHA256-based stateless reset token generator.
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*/
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QUIC_SRT_GEN *ossl_quic_srt_gen_new(OSSL_LIB_CTX *libctx, const char *propq,
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const unsigned char *key, size_t key_len)
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{
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QUIC_SRT_GEN *srt_gen;
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OSSL_PARAM params[3], *p = params;
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if ((srt_gen = OPENSSL_zalloc(sizeof(*srt_gen))) == NULL)
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return NULL;
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if ((srt_gen->mac = EVP_MAC_fetch(libctx, "HMAC", propq)) == NULL)
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goto err;
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if ((srt_gen->mac_ctx = EVP_MAC_CTX_new(srt_gen->mac)) == NULL)
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goto err;
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_DIGEST, "SHA256", 7);
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if (propq != NULL)
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_PROPERTIES,
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(char *)propq, 0);
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*p++ = OSSL_PARAM_construct_end();
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if (!EVP_MAC_init(srt_gen->mac_ctx, key, key_len, params))
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goto err;
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return srt_gen;
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err:
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ossl_quic_srt_gen_free(srt_gen);
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return NULL;
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}
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void ossl_quic_srt_gen_free(QUIC_SRT_GEN *srt_gen)
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{
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if (srt_gen == NULL)
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return;
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EVP_MAC_CTX_free(srt_gen->mac_ctx);
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EVP_MAC_free(srt_gen->mac);
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OPENSSL_free(srt_gen);
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}
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int ossl_quic_srt_gen_calculate_token(QUIC_SRT_GEN *srt_gen,
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const QUIC_CONN_ID *dcid,
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QUIC_STATELESS_RESET_TOKEN *token)
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{
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size_t outl = 0;
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unsigned char mac[32];
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if (!EVP_MAC_init(srt_gen->mac_ctx, NULL, 0, NULL))
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return 0;
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if (!EVP_MAC_update(srt_gen->mac_ctx, (const unsigned char *)dcid->id,
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dcid->id_len))
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return 0;
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if (!EVP_MAC_final(srt_gen->mac_ctx, mac, &outl, sizeof(mac))
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|| outl != sizeof(mac))
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return 0;
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memcpy(token, mac, sizeof(*token));
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return 1;
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}
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