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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update, MD4_Final, MD5_Init, MD5_Update, MD5_Final \- MD2, MD4, and MD5 hash functions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/md2.h> \& \& unsigned char *MD2(const unsigned char *d, unsigned long n, \& unsigned char *md); \& \& int MD2_Init(MD2_CTX *c); \& int MD2_Update(MD2_CTX *c, const unsigned char *data, \& unsigned long len); \& int MD2_Final(unsigned char *md, MD2_CTX *c); \& \& \& #include <openssl/md4.h> \& \& unsigned char *MD4(const unsigned char *d, unsigned long n, \& unsigned char *md); \& \& int MD4_Init(MD4_CTX *c); \& int MD4_Update(MD4_CTX *c, const void *data, \& unsigned long len); \& int MD4_Final(unsigned char *md, MD4_CTX *c); \& \& \& #include <openssl/md5.h> \& \& unsigned char *MD5(const unsigned char *d, unsigned long n, \& unsigned char *md); \& \& int MD5_Init(MD5_CTX *c); \& int MD5_Update(MD5_CTX *c, const void *data, \& unsigned long len); \& int MD5_Final(unsigned char *md, MD5_CTX *c); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\s-1MD2, MD4,\s0 and \s-1MD5\s0 are cryptographic hash functions with a 128 bit output. .PP \&\s-1\fBMD2\s0()\fR, \s-1\fBMD4\s0()\fR, and \s-1\fBMD5\s0()\fR compute the \s-1MD2, MD4,\s0 and \s-1MD5\s0 message digest of the \fBn\fR bytes at \fBd\fR and place it in \fBmd\fR (which must have space for \s-1MD2_DIGEST_LENGTH\s0 == \s-1MD4_DIGEST_LENGTH\s0 == \s-1MD5_DIGEST_LENGTH\s0 == 16 bytes of output). If \fBmd\fR is \s-1NULL,\s0 the digest is placed in a static array. .PP The following functions may be used if the message is not completely stored in memory: .PP \&\fBMD2_Init()\fR initializes a \fB\s-1MD2_CTX\s0\fR structure. .PP \&\fBMD2_Update()\fR can be called repeatedly with chunks of the message to be hashed (\fBlen\fR bytes at \fBdata\fR). .PP \&\fBMD2_Final()\fR places the message digest in \fBmd\fR, which must have space for \s-1MD2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MD2_CTX\s0\fR. .PP \&\fBMD4_Init()\fR, \fBMD4_Update()\fR, \fBMD4_Final()\fR, \fBMD5_Init()\fR, \fBMD5_Update()\fR, and \&\fBMD5_Final()\fR are analogous using an \fB\s-1MD4_CTX\s0\fR and \fB\s-1MD5_CTX\s0\fR structure. .PP Applications should use the higher level functions \&\fBEVP_DigestInit\fR\|(3) etc. instead of calling the hash functions directly. .SH "NOTE" .IX Header "NOTE" \&\s-1MD2, MD4,\s0 and \s-1MD5\s0 are recommended only for compatibility with existing applications. In new applications, \s-1SHA\-1\s0 or \s-1RIPEMD\-160\s0 should be preferred. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\s-1\fBMD2\s0()\fR, \s-1\fBMD4\s0()\fR, and \s-1\fBMD5\s0()\fR return pointers to the hash value. .PP \&\fBMD2_Init()\fR, \fBMD2_Update()\fR, \fBMD2_Final()\fR, \fBMD4_Init()\fR, \fBMD4_Update()\fR, \&\fBMD4_Final()\fR, \fBMD5_Init()\fR, \fBMD5_Update()\fR, and \fBMD5_Final()\fR return 1 for success, 0 otherwise. .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1RFC 1319, RFC 1320, RFC 1321\s0 .\" Oracle has added the ARC stability level to this manual page .SH ATTRIBUTES See .BR attributes (7) for descriptions of the following attributes: .sp .TS box; cbp-1 | cbp-1 l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE = Availability library/security/openssl = Stability Pass-through uncommitted .TE .PP .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBsha\fR\|(3), \fBripemd\fR\|(3), \fBEVP_DigestInit\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1\fBMD2\s0()\fR, \fBMD2_Init()\fR, \fBMD2_Update()\fR \fBMD2_Final()\fR, \s-1\fBMD5\s0()\fR, \fBMD5_Init()\fR, \&\fBMD5_Update()\fR and \fBMD5_Final()\fR are available in all versions of SSLeay and OpenSSL. .PP \&\s-1\fBMD4\s0()\fR, \fBMD4_Init()\fR, and \fBMD4_Update()\fR are available in OpenSSL 0.9.6 and above. .SH NOTES .\" Oracle has added source availability information to this manual page Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source-code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://www.openssl.org/source/openssl-1.0.2zi.tar.gz. Further information about this software can be found on the open source community website at https://www.openssl.org/.