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