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138 .TH mdc2 3 "2009-07-19" "1.0.1n" "OpenSSL"
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144 MDC2, MDC2_Init, MDC2_Update, MDC2_Final \- MDC2 hash function
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/mdc2.h>
152 \& unsigned char *MDC2(const unsigned char *d, unsigned long n,
153 \& unsigned char *md);
155 \& int MDC2_Init(MDC2_CTX *c);
156 \& int MDC2_Update(MDC2_CTX *c, const unsigned char *data,
157 \& unsigned long len);
158 \& int MDC2_Final(unsigned char *md, MDC2_CTX *c);
161 .IX Header "DESCRIPTION"
162 \&\s-1MDC2\s0 is a method to construct hash functions with 128 bit output from
163 block ciphers. These functions are an implementation of \s-1MDC2\s0 with
166 \&\s-1\fIMDC2\s0()\fR computes the \s-1MDC2\s0 message digest of the \fBn\fR
167 bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
168 \&\s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output). If \fBmd\fR is \s-1NULL,\s0 the digest
169 is placed in a static array.
171 The following functions may be used if the message is not completely
174 \&\fIMDC2_Init()\fR initializes a \fB\s-1MDC2_CTX\s0\fR structure.
176 \&\fIMDC2_Update()\fR can be called repeatedly with chunks of the message to
177 be hashed (\fBlen\fR bytes at \fBdata\fR).
179 \&\fIMDC2_Final()\fR places the message digest in \fBmd\fR, which must have space
180 for \s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MDC2_CTX\s0\fR.
182 Applications should use the higher level functions
183 \&\fIEVP_DigestInit\fR\|(3) etc. instead of calling the
184 hash functions directly.
186 .IX Header "RETURN VALUES"
187 \&\s-1\fIMDC2\s0()\fR returns a pointer to the hash value.
189 \&\fIMDC2_Init()\fR, \fIMDC2_Update()\fR and \fIMDC2_Final()\fR return 1 for success, 0 otherwise.
191 .IX Header "CONFORMING TO"
192 \&\s-1ISO/IEC 10118\-2,\s0 with \s-1DES\s0
194 .IX Header "SEE ALSO"
195 \&\fIopenssl_sha\fR\|(3), \fIEVP_DigestInit\fR\|(3)
198 \&\s-1\fIMDC2\s0()\fR, \fIMDC2_Init()\fR, \fIMDC2_Update()\fR and \fIMDC2_Final()\fR are available since