Upgrade to OpenSSL 0.9.8h.
[dragonfly.git] / secure / lib / libcrypto / man / mdc2.3
CommitLineData
aac4ff6f 1.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32
8b0cefbb
JR
2.\"
3.\" Standard preamble:
4.\" ========================================================================
5.de Sh \" Subsection heading
984263bc
MD
6.br
7.if t .Sp
8.ne 5
9.PP
10\fB\\$1\fR
11.PP
12..
8b0cefbb 13.de Sp \" Vertical space (when we can't use .PP)
984263bc
MD
14.if t .sp .5v
15.if n .sp
16..
8b0cefbb 17.de Vb \" Begin verbatim text
984263bc
MD
18.ft CW
19.nf
20.ne \\$1
21..
8b0cefbb 22.de Ve \" End verbatim text
984263bc 23.ft R
984263bc
MD
24.fi
25..
8b0cefbb
JR
26.\" Set up some character translations and predefined strings. \*(-- will
27.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
aac4ff6f
PA
28.\" double quote, and \*(R" will give a right double quote. | will give a
29.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to
30.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C'
31.\" expand to `' in nroff, nothing in troff, for use with C<>.
32.tr \(*W-|\(bv\*(Tr
8b0cefbb 33.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
984263bc 34.ie n \{\
8b0cefbb
JR
35. ds -- \(*W-
36. ds PI pi
37. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
38. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
39. ds L" ""
40. ds R" ""
41. ds C` ""
42. ds C' ""
984263bc
MD
43'br\}
44.el\{\
8b0cefbb
JR
45. ds -- \|\(em\|
46. ds PI \(*p
47. ds L" ``
48. ds R" ''
984263bc 49'br\}
8b0cefbb
JR
50.\"
51.\" If the F register is turned on, we'll generate index entries on stderr for
52.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
53.\" entries marked with X<> in POD. Of course, you'll have to process the
54.\" output yourself in some meaningful fashion.
55.if \nF \{\
56. de IX
57. tm Index:\\$1\t\\n%\t"\\$2"
984263bc 58..
8b0cefbb
JR
59. nr % 0
60. rr F
984263bc 61.\}
8b0cefbb 62.\"
aac4ff6f
PA
63.\" For nroff, turn off justification. Always turn off hyphenation; it makes
64.\" way too many mistakes in technical documents.
65.hy 0
66.if n .na
67.\"
8b0cefbb
JR
68.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
69.\" Fear. Run. Save yourself. No user-serviceable parts.
70. \" fudge factors for nroff and troff
984263bc 71.if n \{\
8b0cefbb
JR
72. ds #H 0
73. ds #V .8m
74. ds #F .3m
75. ds #[ \f1
76. ds #] \fP
984263bc
MD
77.\}
78.if t \{\
8b0cefbb
JR
79. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
80. ds #V .6m
81. ds #F 0
82. ds #[ \&
83. ds #] \&
984263bc 84.\}
8b0cefbb 85. \" simple accents for nroff and troff
984263bc 86.if n \{\
8b0cefbb
JR
87. ds ' \&
88. ds ` \&
89. ds ^ \&
90. ds , \&
91. ds ~ ~
92. ds /
984263bc
MD
93.\}
94.if t \{\
8b0cefbb
JR
95. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
96. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
97. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
98. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
99. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
100. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
984263bc 101.\}
8b0cefbb 102. \" troff and (daisy-wheel) nroff accents
984263bc
MD
103.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
104.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
105.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
106.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
107.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
108.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
109.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
110.ds ae a\h'-(\w'a'u*4/10)'e
111.ds Ae A\h'-(\w'A'u*4/10)'E
8b0cefbb 112. \" corrections for vroff
984263bc
MD
113.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
114.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
8b0cefbb 115. \" for low resolution devices (crt and lpr)
984263bc
MD
116.if \n(.H>23 .if \n(.V>19 \
117\{\
8b0cefbb
JR
118. ds : e
119. ds 8 ss
120. ds o a
121. ds d- d\h'-1'\(ga
122. ds D- D\h'-1'\(hy
123. ds th \o'bp'
124. ds Th \o'LP'
125. ds ae ae
126. ds Ae AE
984263bc
MD
127.\}
128.rm #[ #] #H #V #F C
8b0cefbb
JR
129.\" ========================================================================
130.\"
131.IX Title "mdc2 3"
aac4ff6f 132.TH mdc2 3 "2008-09-06" "0.9.8h" "OpenSSL"
984263bc 133.SH "NAME"
74dab6c2 134MDC2, MDC2_Init, MDC2_Update, MDC2_Final \- MDC2 hash function
984263bc 135.SH "SYNOPSIS"
8b0cefbb 136.IX Header "SYNOPSIS"
984263bc
MD
137.Vb 1
138\& #include <openssl/mdc2.h>
aac4ff6f
PA
139.Ve
140.PP
141.Vb 2
984263bc
MD
142\& unsigned char *MDC2(const unsigned char *d, unsigned long n,
143\& unsigned char *md);
aac4ff6f
PA
144.Ve
145.PP
146.Vb 4
edae4a78
PA
147\& int MDC2_Init(MDC2_CTX *c);
148\& int MDC2_Update(MDC2_CTX *c, const unsigned char *data,
984263bc 149\& unsigned long len);
edae4a78 150\& int MDC2_Final(unsigned char *md, MDC2_CTX *c);
984263bc
MD
151.Ve
152.SH "DESCRIPTION"
8b0cefbb
JR
153.IX Header "DESCRIPTION"
154\&\s-1MDC2\s0 is a method to construct hash functions with 128 bit output from
155block ciphers. These functions are an implementation of \s-1MDC2\s0 with
156\&\s-1DES\s0.
984263bc 157.PP
8b0cefbb 158\&\s-1\fIMDC2\s0()\fR computes the \s-1MDC2\s0 message digest of the \fBn\fR
984263bc 159bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
8b0cefbb 160\&\s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output). If \fBmd\fR is \s-1NULL\s0, the digest
984263bc
MD
161is placed in a static array.
162.PP
163The following functions may be used if the message is not completely
164stored in memory:
165.PP
8b0cefbb 166\&\fIMDC2_Init()\fR initializes a \fB\s-1MDC2_CTX\s0\fR structure.
984263bc 167.PP
8b0cefbb 168\&\fIMDC2_Update()\fR can be called repeatedly with chunks of the message to
984263bc
MD
169be hashed (\fBlen\fR bytes at \fBdata\fR).
170.PP
8b0cefbb
JR
171\&\fIMDC2_Final()\fR places the message digest in \fBmd\fR, which must have space
172for \s-1MDC2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MDC2_CTX\s0\fR.
984263bc
MD
173.PP
174Applications should use the higher level functions
8b0cefbb 175\&\fIEVP_DigestInit\fR\|(3) etc. instead of calling the
984263bc
MD
176hash functions directly.
177.SH "RETURN VALUES"
8b0cefbb 178.IX Header "RETURN VALUES"
aac4ff6f 179\&\s-1\fIMDC2\s0()\fR returns a pointer to the hash value.
984263bc 180.PP
edae4a78 181\&\fIMDC2_Init()\fR, \fIMDC2_Update()\fR and \fIMDC2_Final()\fR return 1 for success, 0 otherwise.
984263bc 182.SH "CONFORMING TO"
74dab6c2 183.IX Header "CONFORMING TO"
8b0cefbb
JR
184\&\s-1ISO/IEC\s0 10118\-2, with \s-1DES\s0
185.SH "SEE ALSO"
74dab6c2 186.IX Header "SEE ALSO"
8b0cefbb
JR
187\&\fIsha\fR\|(3), \fIEVP_DigestInit\fR\|(3)
188.SH "HISTORY"
74dab6c2 189.IX Header "HISTORY"
8b0cefbb
JR
190\&\s-1\fIMDC2\s0()\fR, \fIMDC2_Init()\fR, \fIMDC2_Update()\fR and \fIMDC2_Final()\fR are available since
191SSLeay 0.8.