179 lines
4.9 KiB
C
179 lines
4.9 KiB
C
/*
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* sha1.h
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*
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* interface to the Secure Hash Algorithm v.1 (SHA-1), specified in
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* FIPS 180-1
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*
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* David A. McGrew
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* Cisco Systems, Inc.
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*/
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/*
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*
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* Copyright (c) 2001-2017, Cisco Systems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef SHA1_H
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#define SHA1_H
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "err.h"
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#ifdef OPENSSL
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#include <openssl/evp.h>
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#include <stdint.h>
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#else
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#include "datatypes.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef OPENSSL
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/*
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* srtp_sha1_init(&ctx) initializes the SHA1 context ctx
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*
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* srtp_sha1_update(&ctx, msg, len) hashes the len octets starting at msg
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* into the SHA1 context
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*
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* srtp_sha1_final(&ctx, output) performs the final processing of the SHA1
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* context and writes the result to the 20 octets at output
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*
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* Return values are ignored on the EVP functions since all three
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* of these functions return void.
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*
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*/
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/* OpenSSL 1.1.0 made EVP_MD_CTX an opaque structure, which must be allocated
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using EVP_MD_CTX_new. But this function doesn't exist in OpenSSL 1.0.x. */
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#if OPENSSL_VERSION_NUMBER < 0x10100000L
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typedef EVP_MD_CTX srtp_sha1_ctx_t;
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static inline void srtp_sha1_init (srtp_sha1_ctx_t *ctx)
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{
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EVP_MD_CTX_init(ctx);
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EVP_DigestInit(ctx, EVP_sha1());
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}
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static inline void srtp_sha1_update (srtp_sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg)
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{
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EVP_DigestUpdate(ctx, M, octets_in_msg);
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}
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static inline void srtp_sha1_final (srtp_sha1_ctx_t *ctx, uint32_t *output)
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{
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unsigned int len = 0;
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EVP_DigestFinal(ctx, (unsigned char*)output, &len);
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EVP_MD_CTX_cleanup(ctx);
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}
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#else
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typedef EVP_MD_CTX* srtp_sha1_ctx_t;
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static inline void srtp_sha1_init (srtp_sha1_ctx_t *ctx)
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{
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*ctx = EVP_MD_CTX_new();
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EVP_DigestInit(*ctx, EVP_sha1());
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}
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static inline void srtp_sha1_update (srtp_sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg)
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{
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EVP_DigestUpdate(*ctx, M, octets_in_msg);
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}
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static inline void srtp_sha1_final (srtp_sha1_ctx_t *ctx, uint32_t *output)
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{
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unsigned int len = 0;
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EVP_DigestFinal(*ctx, (unsigned char*)output, &len);
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EVP_MD_CTX_free(*ctx);
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}
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#endif
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#else
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typedef struct {
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uint32_t H[5]; /* state vector */
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uint32_t M[16]; /* message buffer */
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int octets_in_buffer; /* octets of message in buffer */
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uint32_t num_bits_in_msg; /* total number of bits in message */
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} srtp_sha1_ctx_t;
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/*
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* srtp_sha1_init(&ctx) initializes the SHA1 context ctx
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*
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* srtp_sha1_update(&ctx, msg, len) hashes the len octets starting at msg
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* into the SHA1 context
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*
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* srtp_sha1_final(&ctx, output) performs the final processing of the SHA1
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* context and writes the result to the 20 octets at output
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*
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*/
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void srtp_sha1_init(srtp_sha1_ctx_t *ctx);
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void srtp_sha1_update(srtp_sha1_ctx_t *ctx, const uint8_t *M, int octets_in_msg);
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void srtp_sha1_final(srtp_sha1_ctx_t * ctx, uint32_t output[5]);
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/*
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* The srtp_sha1_core function is INTERNAL to SHA-1, but it is declared
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* here because it is also used by the cipher SEAL 3.0 in its key
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* setup algorithm.
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*/
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/*
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* srtp_sha1_core(M, H) computes the core sha1 compression function, where M is
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* the next part of the message and H is the intermediate state {H0,
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* H1, ...}
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*
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* this function does not do any of the padding required in the
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* complete sha1 function
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*/
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void srtp_sha1_core(const uint32_t M[16], uint32_t hash_value[5]);
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#endif /* else OPENSSL */
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#ifdef __cplusplus
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}
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#endif
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#endif /* SHA1_H */
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