2 ''' $RCSfile$$Revision$$Date$
20 .ie \\n(.$>=3 .ne \\$3
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.
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
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
80 .\" If the F register is turned on, we'll generate
81 .\" index entries out stderr for the following things:
86 .\" X<> Xref (embedded
87 .\" Of course, you have to process the output yourself
88 .\" in some meaninful fashion.
91 .tm Index:\\$1\t\\n%\t"\\$2"
96 .TH dsa 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
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
107 \\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
110 .\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
111 . \" AM - accent mark definitions
113 . \" fudge factors for nroff and troff
122 . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
128 . \" simple accents for nroff and troff
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'
151 . \" troff and (daisy-wheel) nroff accents
152 .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
153 .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
154 .ds v \\k:\h'-(\\n(.wu*9/10-\*(#H)'\v'-\*(#V'\*(#[\s-4v\s0\v'\*(#V'\h'|\\n:u'\*(#]
155 .ds _ \\k:\h'-(\\n(.wu*9/10-\*(#H+(\*(#F*2/3))'\v'-.4m'\z\(hy\v'.4m'\h'|\\n:u'
156 .ds . \\k:\h'-(\\n(.wu*8/10)'\v'\*(#V*4/10'\z.\v'-\*(#V*4/10'\h'|\\n:u'
157 .ds 3 \*(#[\v'.2m'\s-2\&3\s0\v'-.2m'\*(#]
158 .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
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\*(#]
162 .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
163 .ds ae a\h'-(\w'a'u*4/10)'e
164 .ds Ae A\h'-(\w'A'u*4/10)'E
165 .ds oe o\h'-(\w'o'u*4/10)'e
166 .ds Oe O\h'-(\w'O'u*4/10)'E
167 . \" corrections for vroff
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'
170 . \" for low resolution devices (crt and lpr)
171 .if \n(.H>23 .if \n(.V>19 \
175 . ds v \h'-1'\o'\(aa\(ga'
191 dsa \- Digital Signature Algorithm
195 \& #include <openssl/dsa.h>
196 \& #include <openssl/engine.h>
199 \& DSA * DSA_new(void);
200 \& void DSA_free(DSA *dsa);
203 \& int DSA_size(const DSA *dsa);
206 \& DSA * DSA_generate_parameters(int bits, unsigned char *seed,
207 \& int seed_len, int *counter_ret, unsigned long *h_ret,
208 \& void (*callback)(int, int, void *), void *cb_arg);
211 \& DH * DSA_dup_DH(const DSA *r);
214 \& int DSA_generate_key(DSA *dsa);
217 \& int DSA_sign(int dummy, const unsigned char *dgst, int len,
218 \& unsigned char *sigret, unsigned int *siglen, DSA *dsa);
219 \& int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
221 \& int DSA_verify(int dummy, const unsigned char *dgst, int len,
222 \& const unsigned char *sigbuf, int siglen, DSA *dsa);
225 \& void DSA_set_default_method(const DSA_METHOD *meth);
226 \& const DSA_METHOD *DSA_get_default_method(void);
227 \& int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);
228 \& DSA *DSA_new_method(ENGINE *engine);
229 \& const DSA_METHOD *DSA_OpenSSL(void);
232 \& int DSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
233 \& int (*dup_func)(), void (*free_func)());
234 \& int DSA_set_ex_data(DSA *d, int idx, char *arg);
235 \& char *DSA_get_ex_data(DSA *d, int idx);
238 \& DSA_SIG *DSA_SIG_new(void);
239 \& void DSA_SIG_free(DSA_SIG *a);
240 \& int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
241 \& DSA_SIG *d2i_DSA_SIG(DSA_SIG **v, unsigned char **pp, long length);
244 \& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
245 \& int DSA_do_verify(const unsigned char *dgst, int dgst_len,
246 \& DSA_SIG *sig, DSA *dsa);
249 \& DSA * d2i_DSAPublicKey(DSA **a, unsigned char **pp, long length);
250 \& DSA * d2i_DSAPrivateKey(DSA **a, unsigned char **pp, long length);
251 \& DSA * d2i_DSAparams(DSA **a, unsigned char **pp, long length);
252 \& int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
253 \& int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
254 \& int i2d_DSAparams(const DSA *a,unsigned char **pp);
257 \& int DSAparams_print(BIO *bp, const DSA *x);
258 \& int DSAparams_print_fp(FILE *fp, const DSA *x);
259 \& int DSA_print(BIO *bp, const DSA *x, int off);
260 \& int DSA_print_fp(FILE *bp, const DSA *x, int off);
263 These functions implement the Digital Signature Algorithm (DSA). The
264 generation of shared DSA parameters is described in
265 DSA_generate_parameters(3);
266 DSA_generate_key(3) describes how to
267 generate a signature key. Signature generation and verification are
268 described in DSA_sign(3).
270 The \fBDSA\fR structure consists of several BIGNUM components.
275 \& BIGNUM *p; // prime number (public)
276 \& BIGNUM *q; // 160-bit subprime, q | p-1 (public)
277 \& BIGNUM *g; // generator of subgroup (public)
278 \& BIGNUM *priv_key; // private key x
279 \& BIGNUM *pub_key; // public key y = g^x
284 In public keys, \fBpriv_key\fR is NULL.
286 Note that DSA keys may use non-standard \fBDSA_METHOD\fR implementations,
287 either directly or by the use of \fBENGINE\fR modules. In some cases (eg. an
288 ENGINE providing support for hardware-embedded keys), these BIGNUM values
289 will not be used by the implementation or may be used for alternative data
290 storage. For this reason, applications should generally avoid using DSA
291 structure elements directly and instead use API functions to query or
294 US Federal Information Processing Standard FIPS 186 (Digital Signature
295 Standard, DSS), ANSI X9.30
297 bn(3), dh(3), err(3), rand(3),
298 rsa(3), sha(3), engine(3),
301 DSA_generate_parameters(3),
304 DSA_sign(3), DSA_set_method(3),
305 DSA_get_ex_new_index(3),
310 .IX Name "dsa - Digital Signature Algorithm"
314 .IX Header "SYNOPSIS"
316 .IX Header "DESCRIPTION"
318 .IX Header "CONFORMING TO"
320 .IX Header "SEE ALSO"