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MDC2.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .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. \*(C+ will .\" give a nicer C++. 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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 "mdc2 3" .TH mdc2 3 "2019-12-20" "1.0.2u" "OpenSSL" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" MDC2, MDC2_Init, MDC2_Update, MDC2_Final \- MDC2 hash function .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/mdc2.h> \& \& unsigned char *MDC2(const unsigned char *d, unsigned long n, \& unsigned char *md); \& \& int MDC2_Init(MDC2_CTX *c); \& int MDC2_Update(MDC2_CTX *c, const unsigned char *data, \& unsigned long len); \& int MDC2_Final(unsigned char *md, MDC2_CTX *c); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\s-1MDC2\s0 is a method to construct hash functions with 128 bit output from block ciphers. These functions are an implementation of \s-1MDC2\s0 with \&\s-1DES.\s0 .PP \&\s-1\fBMDC2\s0()\fR computes the \s-1MDC2\s0 message digest of the \fBn\fR bytes at \fBd\fR and places it in \fBmd\fR (which must have space for \&\s-1MDC2_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 \&\fBMDC2_Init()\fR initializes a \fB\s-1MDC2_CTX\s0\fR structure. .PP \&\fBMDC2_Update()\fR can be called repeatedly with chunks of the message to be hashed (\fBlen\fR bytes at \fBdata\fR). .PP \&\fBMDC2_Final()\fR places the message digest in \fBmd\fR, which must have space for \s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MDC2_CTX\s0\fR. .PP Applications should use the higher level functions \&\fBEVP_DigestInit\fR\|(3) etc. instead of calling the hash functions directly. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\s-1\fBMDC2\s0()\fR returns a pointer to the hash value. .PP \&\fBMDC2_Init()\fR, \fBMDC2_Update()\fR and \fBMDC2_Final()\fR return 1 for success, 0 otherwise. .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1ISO/IEC 10118\-2,\s0 with \s-1DES\s0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBsha\fR\|(3), \fBEVP_DigestInit\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1\fBMDC2\s0()\fR, \fBMDC2_Init()\fR, \fBMDC2_Update()\fR and \fBMDC2_Final()\fR are available since SSLeay 0.8.
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