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Editing: MDC2_Update.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" MDC2, MDC2_Init, MDC2_Update, MDC2_Final \- MDC2 hash function .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/mdc2.h> \& \& 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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\s-1MDC2\s0 is a method to construct hash functions with 128 bit output from block ciphers. These functions are an implementation of \s-1MDC2\s0 with \&\s-1DES.\s0 .PP \&\s-1\fBMDC2\s0()\fR computes the \s-1MDC2\s0 message digest of the \fBn\fR bytes at \fBd\fR and places it in \fBmd\fR (which must have space for \&\s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output). If \fBmd\fR is \s-1NULL,\s0 the digest is placed in a static array. .PP The following functions may be used if the message is not completely stored in memory: .PP \&\fBMDC2_Init()\fR initializes a \fB\s-1MDC2_CTX\s0\fR structure. .PP \&\fBMDC2_Update()\fR can be called repeatedly with chunks of the message to be hashed (\fBlen\fR bytes at \fBdata\fR). .PP \&\fBMDC2_Final()\fR places the message digest in \fBmd\fR, which must have space for \s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MDC2_CTX\s0\fR. .PP Applications should use the higher level functions \&\fBEVP_DigestInit\fR\|(3) etc. instead of calling the hash functions directly. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\s-1\fBMDC2\s0()\fR returns a pointer to the hash value. .PP \&\fBMDC2_Init()\fR, \fBMDC2_Update()\fR and \fBMDC2_Final()\fR return 1 for success, 0 otherwise. .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1ISO/IEC 10118\-2:2000\s0 Hash-Function 2, with \s-1DES\s0 as the underlying block cipher. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBEVP_DigestInit\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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