238 lines
7.2 KiB
Groff
238 lines
7.2 KiB
Groff
.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32
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.\" ========================================================================
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.\"
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.IX Title "md5 3"
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.TH md5 3 "2006-07-29" "0.9.8b" "OpenSSL"
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.SH "NAME"
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MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update,
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MD4_Final, MD5_Init, MD5_Update, MD5_Final \- MD2, MD4, and MD5 hash functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/md2.h>
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.Ve
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.PP
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.Vb 2
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\& unsigned char *MD2(const unsigned char *d, unsigned long n,
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\& unsigned char *md);
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.Ve
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.PP
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.Vb 4
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\& void MD2_Init(MD2_CTX *c);
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\& void MD2_Update(MD2_CTX *c, const unsigned char *data,
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\& unsigned long len);
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\& void MD2_Final(unsigned char *md, MD2_CTX *c);
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.Ve
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.PP
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.Vb 1
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\& #include <openssl/md4.h>
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.Ve
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.PP
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.Vb 2
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\& unsigned char *MD4(const unsigned char *d, unsigned long n,
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\& unsigned char *md);
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.Ve
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.PP
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.Vb 4
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\& void MD4_Init(MD4_CTX *c);
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\& void MD4_Update(MD4_CTX *c, const void *data,
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\& unsigned long len);
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\& void MD4_Final(unsigned char *md, MD4_CTX *c);
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.Ve
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.PP
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.Vb 1
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\& #include <openssl/md5.h>
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.Ve
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.PP
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.Vb 2
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\& unsigned char *MD5(const unsigned char *d, unsigned long n,
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\& unsigned char *md);
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.Ve
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.PP
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.Vb 4
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\& void MD5_Init(MD5_CTX *c);
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\& void MD5_Update(MD5_CTX *c, const void *data,
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\& unsigned long len);
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\& void MD5_Final(unsigned char *md, MD5_CTX *c);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 are cryptographic hash functions with a 128 bit output.
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.PP
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\&\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
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of the \fBn\fR bytes at \fBd\fR and place it in \fBmd\fR (which must have space
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for \s-1MD2_DIGEST_LENGTH\s0 == \s-1MD4_DIGEST_LENGTH\s0 == \s-1MD5_DIGEST_LENGTH\s0 == 16
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bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest is placed in a static
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array.
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.PP
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The following functions may be used if the message is not completely
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stored in memory:
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.PP
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\&\fIMD2_Init()\fR initializes a \fB\s-1MD2_CTX\s0\fR structure.
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.PP
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\&\fIMD2_Update()\fR can be called repeatedly with chunks of the message to
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be hashed (\fBlen\fR bytes at \fBdata\fR).
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.PP
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\&\fIMD2_Final()\fR places the message digest in \fBmd\fR, which must have space
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for \s-1MD2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MD2_CTX\s0\fR.
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.PP
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\&\fIMD4_Init()\fR, \fIMD4_Update()\fR, \fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and
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\&\fIMD5_Final()\fR are analogous using an \fB\s-1MD4_CTX\s0\fR and \fB\s-1MD5_CTX\s0\fR structure.
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.PP
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Applications should use the higher level functions
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\&\fIEVP_DigestInit\fR\|(3)
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etc. instead of calling the hash functions directly.
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.SH "NOTE"
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.IX Header "NOTE"
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\&\s-1MD2\s0, \s-1MD4\s0, and \s-1MD5\s0 are recommended only for compatibility with existing
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applications. In new applications, \s-1SHA\-1\s0 or \s-1RIPEMD\-160\s0 should be
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preferred.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\s-1\fIMD2\s0()\fR, \s-1\fIMD4\s0()\fR, and \s-1\fIMD5\s0()\fR return pointers to the hash value.
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.PP
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\&\fIMD2_Init()\fR, \fIMD2_Update()\fR, \fIMD2_Final()\fR, \fIMD4_Init()\fR, \fIMD4_Update()\fR,
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\&\fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and \fIMD5_Final()\fR do not return
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values.
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.SH "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1RFC\s0 1319, \s-1RFC\s0 1320, \s-1RFC\s0 1321
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIsha\fR\|(3), \fIripemd\fR\|(3), \fIEVP_DigestInit\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\s-1\fIMD2\s0()\fR, \fIMD2_Init()\fR, \fIMD2_Update()\fR \fIMD2_Final()\fR, \s-1\fIMD5\s0()\fR, \fIMD5_Init()\fR,
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\&\fIMD5_Update()\fR and \fIMD5_Final()\fR are available in all versions of SSLeay
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and OpenSSL.
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.PP
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\&\s-1\fIMD4\s0()\fR, \fIMD4_Init()\fR, and \fIMD4_Update()\fR are available in OpenSSL 0.9.6 and
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above.
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