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129 .\" ========================================================================
130 .\"
131 .IX Title "md5 3"
132 .TH md5 3 "2009-07-23" "0.9.8k" "OpenSSL"
133 .SH "NAME"
134 MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update,
135 MD4_Final, MD5_Init, MD5_Update, MD5_Final \- MD2, MD4, and MD5 hash functions
136 .SH "SYNOPSIS"
137 .IX Header "SYNOPSIS"
138 .Vb 1
139 \& #include <openssl/md2.h>
140 .Ve
141 .PP
142 .Vb 2
143 \& unsigned char *MD2(const unsigned char *d, unsigned long n,
144 \& unsigned char *md);
145 .Ve
146 .PP
147 .Vb 4
148 \& int MD2_Init(MD2_CTX *c);
149 \& int MD2_Update(MD2_CTX *c, const unsigned char *data,
150 \& unsigned long len);
151 \& int MD2_Final(unsigned char *md, MD2_CTX *c);
152 .Ve
153 .PP
154 .Vb 1
155 \& #include <openssl/md4.h>
156 .Ve
157 .PP
158 .Vb 2
159 \& unsigned char *MD4(const unsigned char *d, unsigned long n,
160 \& unsigned char *md);
161 .Ve
162 .PP
163 .Vb 4
164 \& int MD4_Init(MD4_CTX *c);
165 \& int MD4_Update(MD4_CTX *c, const void *data,
166 \& unsigned long len);
167 \& int MD4_Final(unsigned char *md, MD4_CTX *c);
168 .Ve
169 .PP
170 .Vb 1
171 \& #include <openssl/md5.h>
172 .Ve
173 .PP
174 .Vb 2
175 \& unsigned char *MD5(const unsigned char *d, unsigned long n,
176 \& unsigned char *md);
177 .Ve
178 .PP
179 .Vb 4
180 \& int MD5_Init(MD5_CTX *c);
181 \& int MD5_Update(MD5_CTX *c, const void *data,
182 \& unsigned long len);
183 \& int MD5_Final(unsigned char *md, MD5_CTX *c);
184 .Ve
185 .SH "DESCRIPTION"
186 .IX Header "DESCRIPTION"
187 \&\s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 are cryptographic hash functions with a 128 bit output.
188 .PP
189 \&\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
190 of the \fBn\fR bytes at \fBd\fR and place it in \fBmd\fR (which must have space
191 for \s-1MD2_DIGEST_LENGTH\s0 == \s-1MD4_DIGEST_LENGTH\s0 == \s-1MD5_DIGEST_LENGTH\s0 == 16
192 bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest is placed in a static
193 array.
194 .PP
195 The following functions may be used if the message is not completely
196 stored in memory:
197 .PP
198 \&\fIMD2_Init()\fR initializes a \fB\s-1MD2_CTX\s0\fR structure.
199 .PP
200 \&\fIMD2_Update()\fR can be called repeatedly with chunks of the message to
201 be hashed (\fBlen\fR bytes at \fBdata\fR).
202 .PP
203 \&\fIMD2_Final()\fR places the message digest in \fBmd\fR, which must have space
204 for \s-1MD2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MD2_CTX\s0\fR.
205 .PP
206 \&\fIMD4_Init()\fR, \fIMD4_Update()\fR, \fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and
207 \&\fIMD5_Final()\fR are analogous using an \fB\s-1MD4_CTX\s0\fR and \fB\s-1MD5_CTX\s0\fR structure.
208 .PP
209 Applications should use the higher level functions
210 \&\fIEVP_DigestInit\fR\|(3)
211 etc. instead of calling the hash functions directly.
212 .SH "NOTE"
213 .IX Header "NOTE"
214 \&\s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 are recommended only for compatibility with existing
215 applications. In new applications, \s-1SHA\-1\s0 or \s-1RIPEMD\-160\s0 should be
216 preferred.
217 .SH "RETURN VALUES"
218 .IX Header "RETURN VALUES"
219 \&\s-1\fIMD2\s0()\fR, \s-1\fIMD4\s0()\fR, and \s-1\fIMD5\s0()\fR return pointers to the hash value.
220 .PP
221 \&\fIMD2_Init()\fR, \fIMD2_Update()\fR, \fIMD2_Final()\fR, \fIMD4_Init()\fR, \fIMD4_Update()\fR,
222 \&\fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and \fIMD5_Final()\fR return 1 for
223 success, 0 otherwise.
224 .SH "CONFORMING TO"
225 .IX Header "CONFORMING TO"
226 \&\s-1RFC\s0 1319, \s-1RFC\s0 1320, \s-1RFC\s0 1321
227 .SH "SEE ALSO"
228 .IX Header "SEE ALSO"
229 \&\fIsha\fR\|(3), \fIripemd\fR\|(3), \fIEVP_DigestInit\fR\|(3)
230 .SH "HISTORY"
231 .IX Header "HISTORY"
232 \&\s-1\fIMD2\s0()\fR, \fIMD2_Init()\fR, \fIMD2_Update()\fR \fIMD2_Final()\fR, \s-1\fIMD5\s0()\fR, \fIMD5_Init()\fR,
233 \&\fIMD5_Update()\fR and \fIMD5_Final()\fR are available in all versions of SSLeay
234 and OpenSSL.
235 .PP
236 \&\s-1\fIMD4\s0()\fR, \fIMD4_Init()\fR, and \fIMD4_Update()\fR are available in OpenSSL 0.9.6 and
237 above.