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.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32 .\" .\" Standard preamble: .\" ======================================================================== .de Sh \" Subsection heading .br .if t .Sp .ne 5 .PP \fB\\$1\fR .PP .. .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. | will give a .\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to .\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C' .\" expand to `' in nroff, nothing in troff, for use with C<>. .tr \(*W-|\(bv\*(Tr .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' 'br\} .\" .\" If the F register is turned on, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . nr % 0 . rr F .\} .\" .\" For nroff, turn off justification. 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No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "md5 3" .TH md5 3 "2017-05-25" "1.0.2l" "OpenSSL" .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> .Ve .PP .Vb 2 \& unsigned char *MD2(const unsigned char *d, unsigned long n, \& unsigned char *md); .Ve .PP .Vb 4 \& 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); .Ve .PP .Vb 1 \& #include <openssl/md4.h> .Ve .PP .Vb 2 \& unsigned char *MD4(const unsigned char *d, unsigned long n, \& unsigned char *md); .Ve .PP .Vb 4 \& 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); .Ve .PP .Vb 1 \& #include <openssl/md5.h> .Ve .PP .Vb 2 \& unsigned char *MD5(const unsigned char *d, unsigned long n, \& unsigned char *md); .Ve .PP .Vb 4 \& 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\s0, \s-1MD4\s0, and \s-1MD5\s0 are cryptographic hash functions with a 128 bit output. .PP \&\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 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 \&\fIMD2_Init()\fR initializes a \fB\s-1MD2_CTX\s0\fR structure. .PP \&\fIMD2_Update()\fR can be called repeatedly with chunks of the message to be hashed (\fBlen\fR bytes at \fBdata\fR). .PP \&\fIMD2_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 \&\fIMD4_Init()\fR, \fIMD4_Update()\fR, \fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and \&\fIMD5_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 \&\fIEVP_DigestInit\fR\|(3) etc. instead of calling the hash functions directly. .SH "NOTE" .IX Header "NOTE" \&\s-1MD2\s0, \s-1MD4\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\fIMD2\s0()\fR, \s-1\fIMD4\s0()\fR, and \s-1\fIMD5\s0()\fR return pointers to the hash value. .PP \&\fIMD2_Init()\fR, \fIMD2_Update()\fR, \fIMD2_Final()\fR, \fIMD4_Init()\fR, \fIMD4_Update()\fR, \&\fIMD4_Final()\fR, \fIMD5_Init()\fR, \fIMD5_Update()\fR, and \fIMD5_Final()\fR return 1 for success, 0 otherwise. .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1RFC\s0 1319, \s-1RFC\s0 1320, \s-1RFC\s0 1321 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIsha\fR\|(3), \fIripemd\fR\|(3), \fIEVP_DigestInit\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1\fIMD2\s0()\fR, \fIMD2_Init()\fR, \fIMD2_Update()\fR \fIMD2_Final()\fR, \s-1\fIMD5\s0()\fR, \fIMD5_Init()\fR, \&\fIMD5_Update()\fR and \fIMD5_Final()\fR are available in all versions of SSLeay and OpenSSL. .PP \&\s-1\fIMD4\s0()\fR, \fIMD4_Init()\fR, and \fIMD4_Update()\fR are available in OpenSSL 0.9.6 and above.