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127 .TH mdc2 3 "2007-10-24" "0.9.8g" "OpenSSL"
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133 MDC2, MDC2_Init, MDC2_Update, MDC2_Final \- MDC2 hash function
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/mdc2.h>
139 \& unsigned char *MDC2(const unsigned char *d, unsigned long n,
140 \& unsigned char *md);
142 \& int MDC2_Init(MDC2_CTX *c);
143 \& int MDC2_Update(MDC2_CTX *c, const unsigned char *data,
144 \& unsigned long len);
145 \& int MDC2_Final(unsigned char *md, MDC2_CTX *c);
148 .IX Header "DESCRIPTION"
149 \&\s-1MDC2\s0 is a method to construct hash functions with 128 bit output from
150 block ciphers. These functions are an implementation of \s-1MDC2\s0 with
153 \&\s-1\fIMDC2\s0()\fR computes the \s-1MDC2\s0 message digest of the \fBn\fR
154 bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
155 \&\s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest
156 is placed in a static array.
158 The following functions may be used if the message is not completely
161 \&\fIMDC2_Init()\fR initializes a \fB\s-1MDC2_CTX\s0\fR structure.
163 \&\fIMDC2_Update()\fR can be called repeatedly with chunks of the message to
164 be hashed (\fBlen\fR bytes at \fBdata\fR).
166 \&\fIMDC2_Final()\fR places the message digest in \fBmd\fR, which must have space
167 for \s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MDC2_CTX\s0\fR.
169 Applications should use the higher level functions
170 \&\fIEVP_DigestInit\fR\|(3) etc. instead of calling the
171 hash functions directly.
173 .IX Header "RETURN VALUES"
174 \&\s-1\fIMDC2\s0()\fR returns a pointer to the hash value.
176 \&\fIMDC2_Init()\fR, \fIMDC2_Update()\fR and \fIMDC2_Final()\fR return 1 for success, 0 otherwise.
178 .IX Header "CONFORMING TO"
179 \&\s-1ISO/IEC\s0 10118\-2, with \s-1DES\s0
181 .IX Header "SEE ALSO"
182 \&\fIsha\fR\|(3), \fIEVP_DigestInit\fR\|(3)
185 \&\s-1\fIMDC2\s0()\fR, \fIMDC2_Init()\fR, \fIMDC2_Update()\fR and \fIMDC2_Final()\fR are available since