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129 .\" ========================================================================
132 .TH md5 3 "2018-08-14" "1.0.2p" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
134 .\" way too many mistakes in technical documents.
138 MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update,
139 MD4_Final, MD5_Init, MD5_Update, MD5_Final \- MD2, MD4, and MD5 hash functions
141 .IX Header "SYNOPSIS"
143 \& #include <openssl/md2.h>
145 \& unsigned char *MD2(const unsigned char *d, unsigned long n,
146 \& unsigned char *md);
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);
154 \& #include <openssl/md4.h>
156 \& unsigned char *MD4(const unsigned char *d, unsigned long n,
157 \& unsigned char *md);
159 \& int MD4_Init(MD4_CTX *c);
160 \& int MD4_Update(MD4_CTX *c, const void *data,
161 \& unsigned long len);
162 \& int MD4_Final(unsigned char *md, MD4_CTX *c);
165 \& #include <openssl/md5.h>
167 \& unsigned char *MD5(const unsigned char *d, unsigned long n,
168 \& unsigned char *md);
170 \& int MD5_Init(MD5_CTX *c);
171 \& int MD5_Update(MD5_CTX *c, const void *data,
172 \& unsigned long len);
173 \& int MD5_Final(unsigned char *md, MD5_CTX *c);
176 .IX Header "DESCRIPTION"
177 \&\s-1MD2, MD4,\s0 and \s-1MD5\s0 are cryptographic hash functions with a 128 bit output.
179 \&\s-1\fIMD2\s0()\fR, \s-1\fIMD4\s0()\fR, and \s-1\fIMD5\s0()\fR compute the \s-1MD2, MD4,\s0 and \s-1MD5\s0 message digest
180 of the \fBn\fR bytes at \fBd\fR and place it in \fBmd\fR (which must have space
181 for \s-1MD2_DIGEST_LENGTH\s0 == \s-1MD4_DIGEST_LENGTH\s0 == \s-1MD5_DIGEST_LENGTH\s0 == 16
182 bytes of output). If \fBmd\fR is \s-1NULL,\s0 the digest is placed in a static
185 The following functions may be used if the message is not completely
188 \&\fIMD2_Init()\fR initializes a \fB\s-1MD2_CTX\s0\fR structure.
190 \&\fIMD2_Update()\fR can be called repeatedly with chunks of the message to
191 be hashed (\fBlen\fR bytes at \fBdata\fR).
193 \&\fIMD2_Final()\fR places the message digest in \fBmd\fR, which must have space
194 for \s-1MD2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MD2_CTX\s0\fR.
196 \&\fIMD4_Init()\fR, \fIMD4_Update()\fR, \fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and
197 \&\fIMD5_Final()\fR are analogous using an \fB\s-1MD4_CTX\s0\fR and \fB\s-1MD5_CTX\s0\fR structure.
199 Applications should use the higher level functions
200 \&\fIEVP_DigestInit\fR\|(3)
201 etc. instead of calling the hash functions directly.
204 \&\s-1MD2, MD4,\s0 and \s-1MD5\s0 are recommended only for compatibility with existing
205 applications. In new applications, \s-1SHA\-1\s0 or \s-1RIPEMD\-160\s0 should be
208 .IX Header "RETURN VALUES"
209 \&\s-1\fIMD2\s0()\fR, \s-1\fIMD4\s0()\fR, and \s-1\fIMD5\s0()\fR return pointers to the hash value.
211 \&\fIMD2_Init()\fR, \fIMD2_Update()\fR, \fIMD2_Final()\fR, \fIMD4_Init()\fR, \fIMD4_Update()\fR,
212 \&\fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and \fIMD5_Final()\fR return 1 for
213 success, 0 otherwise.
215 .IX Header "CONFORMING TO"
216 \&\s-1RFC 1319, RFC 1320, RFC 1321\s0
218 .IX Header "SEE ALSO"
219 \&\fIsha\fR\|(3), \fIripemd\fR\|(3), \fIEVP_DigestInit\fR\|(3)
222 \&\s-1\fIMD2\s0()\fR, \fIMD2_Init()\fR, \fIMD2_Update()\fR \fIMD2_Final()\fR, \s-1\fIMD5\s0()\fR, \fIMD5_Init()\fR,
223 \&\fIMD5_Update()\fR and \fIMD5_Final()\fR are available in all versions of SSLeay
226 \&\s-1\fIMD4\s0()\fR, \fIMD4_Init()\fR, and \fIMD4_Update()\fR are available in OpenSSL 0.9.6 and