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141 .TH md5 3 "0.9.7a" "2003-02-19" "OpenSSL"
144 \&\s-1MD2\s0, \s-1MD4\s0, \s-1MD5\s0, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update,
145 MD4_Final, MD5_Init, MD5_Update, MD5_Final \- \s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 hash functions
147 .IX Header "SYNOPSIS"
149 \& #include <openssl/md2.h>
152 \& unsigned char *MD2(const unsigned char *d, unsigned long n,
153 \& unsigned char *md);
156 \& void MD2_Init(MD2_CTX *c);
157 \& void MD2_Update(MD2_CTX *c, const unsigned char *data,
158 \& unsigned long len);
159 \& void MD2_Final(unsigned char *md, MD2_CTX *c);
162 \& #include <openssl/md4.h>
165 \& unsigned char *MD4(const unsigned char *d, unsigned long n,
166 \& unsigned char *md);
169 \& void MD4_Init(MD4_CTX *c);
170 \& void MD4_Update(MD4_CTX *c, const void *data,
171 \& unsigned long len);
172 \& void MD4_Final(unsigned char *md, MD4_CTX *c);
175 \& #include <openssl/md5.h>
178 \& unsigned char *MD5(const unsigned char *d, unsigned long n,
179 \& unsigned char *md);
182 \& void MD5_Init(MD5_CTX *c);
183 \& void MD5_Update(MD5_CTX *c, const void *data,
184 \& unsigned long len);
185 \& void MD5_Final(unsigned char *md, MD5_CTX *c);
188 .IX Header "DESCRIPTION"
189 \&\s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 are cryptographic hash functions with a 128 bit output.
191 \&\fIMD2()\fR, \fIMD4()\fR, and \fIMD5()\fR compute the \s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 message digest
192 of the \fBn\fR bytes at \fBd\fR and place it in \fBmd\fR (which must have space
193 for \s-1MD2_DIGEST_LENGTH\s0 == \s-1MD4_DIGEST_LENGTH\s0 == \s-1MD5_DIGEST_LENGTH\s0 == 16
194 bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest is placed in a static
197 The following functions may be used if the message is not completely
200 \&\fIMD2_Init()\fR initializes a \fB\s-1MD2_CTX\s0\fR structure.
202 \&\fIMD2_Update()\fR can be called repeatedly with chunks of the message to
203 be hashed (\fBlen\fR bytes at \fBdata\fR).
205 \&\fIMD2_Final()\fR places the message digest in \fBmd\fR, which must have space
206 for \s-1MD2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MD2_CTX\s0\fR.
208 \&\fIMD4_Init()\fR, \fIMD4_Update()\fR, \fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and
209 \&\fIMD5_Final()\fR are analogous using an \fB\s-1MD4_CTX\s0\fR and \fB\s-1MD5_CTX\s0\fR structure.
211 Applications should use the higher level functions
213 etc. instead of calling the hash functions directly.
216 \&\s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 are recommended only for compatibility with existing
217 applications. In new applications, \s-1SHA-1\s0 or \s-1RIPEMD-160\s0 should be
220 .IX Header "RETURN VALUES"
221 \&\fIMD2()\fR, \fIMD4()\fR, and \fIMD5()\fR return pointers to the hash value.
223 \&\fIMD2_Init()\fR, \fIMD2_Update()\fR, \fIMD2_Final()\fR, \fIMD4_Init()\fR, \fIMD4_Update()\fR,
224 \&\fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and \fIMD5_Final()\fR do not return
227 .IX Header "CONFORMING TO"
228 \&\s-1RFC\s0 1319, \s-1RFC\s0 1320, \s-1RFC\s0 1321
230 .IX Header "SEE ALSO"
231 sha(3), ripemd(3), EVP_DigestInit(3)
234 \&\fIMD2()\fR, \fIMD2_Init()\fR, \fIMD2_Update()\fR \fIMD2_Final()\fR, \fIMD5()\fR, \fIMD5_Init()\fR,
235 \&\fIMD5_Update()\fR and \fIMD5_Final()\fR are available in all versions of SSLeay
238 \&\fIMD4()\fR, \fIMD4_Init()\fR, and \fIMD4_Update()\fR are available in OpenSSL 0.9.6 and