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/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */


/*! \file isc/md5.h
 * \brief This is the header file for the MD5 message-digest algorithm.
 *
 * The algorithm is due to Ron Rivest.  This code was
 * written by Colin Plumb in 1993, no copyright is claimed.
 * This code is in the public domain; do with it what you wish.
 *
 * Equivalent code is available from RSA Data Security, Inc.
 * This code has been tested against that, and is equivalent,
 * except that you don't need to include two pages of legalese
 * with every copy.
 *
 * To compute the message digest of a chunk of bytes, declare an
 * MD5Context structure, pass it to MD5Init, call MD5Update as
 * needed on buffers full of bytes, and then call MD5Final, which
 * will fill a supplied 16-byte array with the digest.
 *
 * Changed so as no longer to depend on Colin Plumb's `usual.h'
 * header definitions; now uses stuff from dpkg's config.h
 *  - Ian Jackson <ijackson@nyx.cs.du.edu>.
 * Still in the public domain.
 */

#ifndef ISC_MD5_H
#define ISC_MD5_H 1

#include <pk11/site.h>

#ifndef PK11_MD5_DISABLE

#include <stdbool.h>

#include <isc/lang.h>
#include <isc/platform.h>
#include <isc/types.h>

#define ISC_MD5_DIGESTLENGTH 16U
#define ISC_MD5_BLOCK_LENGTH 64U

#ifdef ISC_PLATFORM_OPENSSLHASH
#include <openssl/opensslv.h>
#include <openssl/evp.h>

typedef struct {
	EVP_MD_CTX *ctx;
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
	EVP_MD_CTX _ctx;
#endif
} isc_md5_t;

#elif PKCS11CRYPTO
#include <pk11/pk11.h>

typedef pk11_context_t isc_md5_t;

#else

typedef struct {
	uint32_t buf[4];
	uint32_t bytes[2];
	uint32_t in[16];
} isc_md5_t;
#endif

ISC_LANG_BEGINDECLS

void
isc_md5_init(isc_md5_t *ctx);

void
isc_md5_invalidate(isc_md5_t *ctx);

void
isc_md5_update(isc_md5_t *ctx, const unsigned char *buf, unsigned int len);

void
isc_md5_final(isc_md5_t *ctx, unsigned char *digest);

bool
isc_md5_check(bool testing);

bool
isc_md5_available(void);

ISC_LANG_ENDDECLS

#endif /* !PK11_MD5_DISABLE */

#endif /* ISC_MD5_H */