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Title "MDC2_INIT 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function 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 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

\s-1MDC2\s0() computes the \s-1MDC2\s0 message digest of the n bytes at d and places it in md (which must have space for \s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output). If md is \s-1NULL,\s0 the digest is placed in a static array.

The following functions may be used if the message is not completely stored in memory:

\fBMDC2_Init() initializes a \s-1MDC2_CTX\s0 structure.

\fBMDC2_Update() can be called repeatedly with chunks of the message to be hashed (len bytes at data).

\fBMDC2_Final() places the message digest in md, which must have space for \s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \s-1MDC2_CTX\s0.

Applications should use the higher level functions \fBEVP_DigestInit\|(3) etc. instead of calling the hash functions directly.

Header "RETURN VALUES" \s-1MDC2\s0() returns a pointer to the hash value.

\fBMDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0 otherwise.

Header "CONFORMING TO" \s-1ISO/IEC 10118-2:2000\s0 Hash-Function 2, with \s-1DES\s0 as the underlying block cipher. Header "SEE ALSO" \fBEVP_DigestInit\|(3) Header "COPYRIGHT" Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.

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>.