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[dragonfly.git] / secure / lib / libcrypto / man / sha.3
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2''' $RCSfile$$Revision$$Date$
3'''
4''' $Log$
5'''
6.de Sh
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10.PP
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34'''
35'''
36''' Set up \*(-- to give an unbreakable dash;
37''' string Tr holds user defined translation string.
38''' Bell System Logo is used as a dummy character.
39'''
984263bc 40.tr \(*W-|\(bv\*(Tr
984263bc 41.ie n \{\
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42.ds -- \(*W-
43.ds PI pi
44.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
45.if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
46.ds L" ""
47.ds R" ""
48''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
49''' \*(L" and \*(R", except that they are used on ".xx" lines,
50''' such as .IP and .SH, which do another additional levels of
51''' double-quote interpretation
52.ds M" """
53.ds S" """
54.ds N" """""
55.ds T" """""
56.ds L' '
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62'br\}
63.el\{\
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64.ds -- \(em\|
65.tr \*(Tr
66.ds L" ``
67.ds R" ''
68.ds M" ``
69.ds S" ''
70.ds N" ``
71.ds T" ''
72.ds L' `
73.ds R' '
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77.ds T' '
78.ds PI \(*p
984263bc 79'br\}
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80.\" If the F register is turned on, we'll generate
81.\" index entries out stderr for the following things:
82.\" TH Title
83.\" SH Header
84.\" Sh Subsection
85.\" Ip Item
86.\" X<> Xref (embedded
87.\" Of course, you have to process the output yourself
88.\" in some meaninful fashion.
89.if \nF \{
90.de IX
91.tm Index:\\$1\t\\n%\t"\\$2"
984263bc 92..
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93.nr % 0
94.rr F
984263bc 95.\}
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96.TH sha 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
98.if n .hy 0
984263bc 99.if n .na
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100.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
101.de CQ \" put $1 in typewriter font
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103'if n "\c
104'if t \\&\\$1\c
105'if n \\&\\$1\c
106'if n \&"
107\\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
108'.ft R
109..
110.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
111. \" AM - accent mark definitions
984263bc 112.bd B 3
74dab6c2 113. \" fudge factors for nroff and troff
984263bc 114.if n \{\
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115. ds #H 0
116. ds #V .8m
117. ds #F .3m
118. ds #[ \f1
119. ds #] \fP
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120.\}
121.if t \{\
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122. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
123. ds #V .6m
124. ds #F 0
125. ds #[ \&
126. ds #] \&
984263bc 127.\}
74dab6c2 128. \" simple accents for nroff and troff
984263bc 129.if n \{\
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130. ds ' \&
131. ds ` \&
132. ds ^ \&
133. ds , \&
134. ds ~ ~
135. ds ? ?
136. ds ! !
137. ds /
138. ds q
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139.\}
140.if t \{\
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141. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
142. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
143. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
144. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
145. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
146. ds ? \s-2c\h'-\w'c'u*7/10'\u\h'\*(#H'\zi\d\s+2\h'\w'c'u*8/10'
147. ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m'
148. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
149. ds q o\h'-\w'o'u*8/10'\s-4\v'.4m'\z\(*i\v'-.4m'\s+4\h'\w'o'u*8/10'
984263bc 150.\}
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159.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
160.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
161.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
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165.ds oe o\h'-(\w'o'u*4/10)'e
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167. \" corrections for vroff
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168.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
169.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
74dab6c2 170. \" for low resolution devices (crt and lpr)
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171.if \n(.H>23 .if \n(.V>19 \
172\{\
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173. ds : e
174. ds 8 ss
175. ds v \h'-1'\o'\(aa\(ga'
176. ds _ \h'-1'^
177. ds . \h'-1'.
178. ds 3 3
179. ds o a
180. ds d- d\h'-1'\(ga
181. ds D- D\h'-1'\(hy
182. ds th \o'bp'
183. ds Th \o'LP'
184. ds ae ae
185. ds Ae AE
186. ds oe oe
187. ds Oe OE
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188.\}
189.rm #[ #] #H #V #F C
984263bc 190.SH "NAME"
74dab6c2 191SHA1, SHA1_Init, SHA1_Update, SHA1_Final \- Secure Hash Algorithm
984263bc 192.SH "SYNOPSIS"
74dab6c2 193.PP
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194.Vb 1
195\& #include <openssl/sha.h>
196.Ve
197.Vb 2
198\& unsigned char *SHA1(const unsigned char *d, unsigned long n,
199\& unsigned char *md);
200.Ve
201.Vb 4
202\& void SHA1_Init(SHA_CTX *c);
203\& void SHA1_Update(SHA_CTX *c, const void *data,
204\& unsigned long len);
205\& void SHA1_Final(unsigned char *md, SHA_CTX *c);
206.Ve
207.SH "DESCRIPTION"
74dab6c2 208SHA\-1 (Secure Hash Algorithm) is a cryptographic hash function with a
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209160 bit output.
210.PP
74dab6c2 211\fISHA1()\fR computes the SHA\-1 message digest of the \fBn\fR
984263bc 212bytes at \fBd\fR and places it in \fBmd\fR (which must have space for
74dab6c2 213SHA_DIGEST_LENGTH == 20 bytes of output). If \fBmd\fR is NULL, the digest
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214is placed in a static array.
215.PP
216The following functions may be used if the message is not completely
217stored in memory:
218.PP
74dab6c2 219\fISHA1_Init()\fR initializes a \fBSHA_CTX\fR structure.
984263bc 220.PP
74dab6c2 221\fISHA1_Update()\fR can be called repeatedly with chunks of the message to
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222be hashed (\fBlen\fR bytes at \fBdata\fR).
223.PP
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224\fISHA1_Final()\fR places the message digest in \fBmd\fR, which must have space
225for SHA_DIGEST_LENGTH == 20 bytes of output, and erases the \fBSHA_CTX\fR.
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226.PP
227Applications should use the higher level functions
228EVP_DigestInit(3)
229etc. instead of calling the hash functions directly.
230.PP
74dab6c2 231The predecessor of SHA\-1, SHA, is also implemented, but it should be
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232used only when backward compatibility is required.
233.SH "RETURN VALUES"
74dab6c2 234\fISHA1()\fR returns a pointer to the hash value.
984263bc 235.PP
74dab6c2 236\fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR do not return values.
984263bc 237.SH "CONFORMING TO"
74dab6c2 238SHA: US Federal Information Processing Standard FIPS PUB 180 (Secure Hash
984263bc 239Standard),
74dab6c2 240SHA\-1: US Federal Information Processing Standard FIPS PUB 180-1 (Secure Hash
984263bc 241Standard),
74dab6c2 242ANSI X9.30
984263bc 243.SH "SEE ALSO"
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244ripemd(3), hmac(3), EVP_DigestInit(3)
245.SH "HISTORY"
74dab6c2 246\fISHA1()\fR, \fISHA1_Init()\fR, \fISHA1_Update()\fR and \fISHA1_Final()\fR are available in all
984263bc 247versions of SSLeay and OpenSSL.
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248
249.rn }` ''
250.IX Title "sha 3"
251.IX Name "SHA1, SHA1_Init, SHA1_Update, SHA1_Final - Secure Hash Algorithm"
252
253.IX Header "NAME"
254
255.IX Header "SYNOPSIS"
256
257.IX Header "DESCRIPTION"
258
259.IX Header "RETURN VALUES"
260
261.IX Header "CONFORMING TO"
262
263.IX Header "SEE ALSO"
264
265.IX Header "HISTORY"
266