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132 .\" ========================================================================
135 .TH md5 3 "2009-04-11" "0.9.8k" "OpenSSL"
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141 MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update,
142 MD4_Final, MD5_Init, MD5_Update, MD5_Final \- MD2, MD4, and MD5 hash functions
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/md2.h>
148 \& unsigned char *MD2(const unsigned char *d, unsigned long n,
149 \& unsigned char *md);
151 \& int MD2_Init(MD2_CTX *c);
152 \& int MD2_Update(MD2_CTX *c, const unsigned char *data,
153 \& unsigned long len);
154 \& int MD2_Final(unsigned char *md, MD2_CTX *c);
157 \& #include <openssl/md4.h>
159 \& unsigned char *MD4(const unsigned char *d, unsigned long n,
160 \& unsigned char *md);
162 \& int MD4_Init(MD4_CTX *c);
163 \& int MD4_Update(MD4_CTX *c, const void *data,
164 \& unsigned long len);
165 \& int MD4_Final(unsigned char *md, MD4_CTX *c);
168 \& #include <openssl/md5.h>
170 \& unsigned char *MD5(const unsigned char *d, unsigned long n,
171 \& unsigned char *md);
173 \& int MD5_Init(MD5_CTX *c);
174 \& int MD5_Update(MD5_CTX *c, const void *data,
175 \& unsigned long len);
176 \& int MD5_Final(unsigned char *md, MD5_CTX *c);
179 .IX Header "DESCRIPTION"
180 \&\s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 are cryptographic hash functions with a 128 bit output.
182 \&\s-1\fIMD2\s0()\fR, \s-1\fIMD4\s0()\fR, and \s-1\fIMD5\s0()\fR compute the \s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 message digest
183 of the \fBn\fR bytes at \fBd\fR and place it in \fBmd\fR (which must have space
184 for \s-1MD2_DIGEST_LENGTH\s0 == \s-1MD4_DIGEST_LENGTH\s0 == \s-1MD5_DIGEST_LENGTH\s0 == 16
185 bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest is placed in a static
188 The following functions may be used if the message is not completely
191 \&\fIMD2_Init()\fR initializes a \fB\s-1MD2_CTX\s0\fR structure.
193 \&\fIMD2_Update()\fR can be called repeatedly with chunks of the message to
194 be hashed (\fBlen\fR bytes at \fBdata\fR).
196 \&\fIMD2_Final()\fR places the message digest in \fBmd\fR, which must have space
197 for \s-1MD2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MD2_CTX\s0\fR.
199 \&\fIMD4_Init()\fR, \fIMD4_Update()\fR, \fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and
200 \&\fIMD5_Final()\fR are analogous using an \fB\s-1MD4_CTX\s0\fR and \fB\s-1MD5_CTX\s0\fR structure.
202 Applications should use the higher level functions
203 \&\fIEVP_DigestInit\fR\|(3)
204 etc. instead of calling the hash functions directly.
207 \&\s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 are recommended only for compatibility with existing
208 applications. In new applications, \s-1SHA\-1\s0 or \s-1RIPEMD\-160\s0 should be
211 .IX Header "RETURN VALUES"
212 \&\s-1\fIMD2\s0()\fR, \s-1\fIMD4\s0()\fR, and \s-1\fIMD5\s0()\fR return pointers to the hash value.
214 \&\fIMD2_Init()\fR, \fIMD2_Update()\fR, \fIMD2_Final()\fR, \fIMD4_Init()\fR, \fIMD4_Update()\fR,
215 \&\fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and \fIMD5_Final()\fR return 1 for
216 success, 0 otherwise.
218 .IX Header "CONFORMING TO"
219 \&\s-1RFC\s0 1319, \s-1RFC\s0 1320, \s-1RFC\s0 1321
221 .IX Header "SEE ALSO"
222 \&\fIsha\fR\|(3), \fIripemd\fR\|(3), \fIEVP_DigestInit\fR\|(3)
225 \&\s-1\fIMD2\s0()\fR, \fIMD2_Init()\fR, \fIMD2_Update()\fR \fIMD2_Final()\fR, \s-1\fIMD5\s0()\fR, \fIMD5_Init()\fR,
226 \&\fIMD5_Update()\fR and \fIMD5_Final()\fR are available in all versions of SSLeay
229 \&\s-1\fIMD4\s0()\fR, \fIMD4_Init()\fR, and \fIMD4_Update()\fR are available in OpenSSL 0.9.6 and