=pod =head1 NAME MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function =head1 SYNOPSIS #include unsigned char *MDC2(const unsigned char *d, unsigned long n, unsigned char *md); int MDC2_Init(MDC2_CTX *c); int MDC2_Update(MDC2_CTX *c, const unsigned char *data, unsigned long len); int MDC2_Final(unsigned char *md, MDC2_CTX *c); =head1 DESCRIPTION MDC2 is a method to construct hash functions with 128 bit output from block ciphers. These functions are an implementation of MDC2 with DES. MDC2() computes the MDC2 message digest of the B bytes at B and places it in B (which must have space for MDC2_DIGEST_LENGTH == 16 bytes of output). If B is NULL, the digest is placed in a static array. The following functions may be used if the message is not completely stored in memory: MDC2_Init() initializes a B structure. MDC2_Update() can be called repeatedly with chunks of the message to be hashed (B bytes at B). MDC2_Final() places the message digest in B, which must have space for MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the B. Applications should use the higher level functions L etc. instead of calling the hash functions directly. =head1 RETURN VALUES MDC2() returns a pointer to the hash value. MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0 otherwise. =head1 CONFORMING TO ISO/IEC 10118-2:2000 Hash-Function 2, with DES as the underlying block cipher. =head1 SEE ALSO L =head1 COPYRIGHT Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L. =cut