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132 .TH dsa 3 "2004-12-18" "0.9.7e" "OpenSSL"
134 dsa \- Digital Signature Algorithm
136 .IX Header "SYNOPSIS"
138 \& #include <openssl/dsa.h>
139 \& #include <openssl/engine.h>
143 \& DSA * DSA_new(void);
144 \& void DSA_free(DSA *dsa);
148 \& int DSA_size(const DSA *dsa);
152 \& DSA * DSA_generate_parameters(int bits, unsigned char *seed,
153 \& int seed_len, int *counter_ret, unsigned long *h_ret,
154 \& void (*callback)(int, int, void *), void *cb_arg);
158 \& DH * DSA_dup_DH(const DSA *r);
162 \& int DSA_generate_key(DSA *dsa);
166 \& int DSA_sign(int dummy, const unsigned char *dgst, int len,
167 \& unsigned char *sigret, unsigned int *siglen, DSA *dsa);
168 \& int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
170 \& int DSA_verify(int dummy, const unsigned char *dgst, int len,
171 \& const unsigned char *sigbuf, int siglen, DSA *dsa);
175 \& void DSA_set_default_method(const DSA_METHOD *meth);
176 \& const DSA_METHOD *DSA_get_default_method(void);
177 \& int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);
178 \& DSA *DSA_new_method(ENGINE *engine);
179 \& const DSA_METHOD *DSA_OpenSSL(void);
183 \& int DSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
184 \& int (*dup_func)(), void (*free_func)());
185 \& int DSA_set_ex_data(DSA *d, int idx, char *arg);
186 \& char *DSA_get_ex_data(DSA *d, int idx);
190 \& DSA_SIG *DSA_SIG_new(void);
191 \& void DSA_SIG_free(DSA_SIG *a);
192 \& int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
193 \& DSA_SIG *d2i_DSA_SIG(DSA_SIG **v, unsigned char **pp, long length);
197 \& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
198 \& int DSA_do_verify(const unsigned char *dgst, int dgst_len,
199 \& DSA_SIG *sig, DSA *dsa);
203 \& DSA * d2i_DSAPublicKey(DSA **a, unsigned char **pp, long length);
204 \& DSA * d2i_DSAPrivateKey(DSA **a, unsigned char **pp, long length);
205 \& DSA * d2i_DSAparams(DSA **a, unsigned char **pp, long length);
206 \& int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
207 \& int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
208 \& int i2d_DSAparams(const DSA *a,unsigned char **pp);
212 \& int DSAparams_print(BIO *bp, const DSA *x);
213 \& int DSAparams_print_fp(FILE *fp, const DSA *x);
214 \& int DSA_print(BIO *bp, const DSA *x, int off);
215 \& int DSA_print_fp(FILE *bp, const DSA *x, int off);
218 .IX Header "DESCRIPTION"
219 These functions implement the Digital Signature Algorithm (\s-1DSA\s0). The
220 generation of shared \s-1DSA\s0 parameters is described in
221 \&\fIDSA_generate_parameters\fR\|(3);
222 \&\fIDSA_generate_key\fR\|(3) describes how to
223 generate a signature key. Signature generation and verification are
224 described in \fIDSA_sign\fR\|(3).
226 The \fB\s-1DSA\s0\fR structure consists of several \s-1BIGNUM\s0 components.
231 \& BIGNUM *p; // prime number (public)
232 \& BIGNUM *q; // 160-bit subprime, q | p-1 (public)
233 \& BIGNUM *g; // generator of subgroup (public)
234 \& BIGNUM *priv_key; // private key x
235 \& BIGNUM *pub_key; // public key y = g^x
241 In public keys, \fBpriv_key\fR is \s-1NULL\s0.
243 Note that \s-1DSA\s0 keys may use non-standard \fB\s-1DSA_METHOD\s0\fR implementations,
244 either directly or by the use of \fB\s-1ENGINE\s0\fR modules. In some cases (eg. an
245 \&\s-1ENGINE\s0 providing support for hardware-embedded keys), these \s-1BIGNUM\s0 values
246 will not be used by the implementation or may be used for alternative data
247 storage. For this reason, applications should generally avoid using \s-1DSA\s0
248 structure elements directly and instead use \s-1API\s0 functions to query or
251 .IX Header "CONFORMING TO"
252 \&\s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 186 (Digital Signature
253 Standard, \s-1DSS\s0), \s-1ANSI\s0 X9.30
255 .IX Header "SEE ALSO"
256 \&\fIbn\fR\|(3), \fIdh\fR\|(3), \fIerr\fR\|(3), \fIrand\fR\|(3),
257 \&\fIrsa\fR\|(3), \fIsha\fR\|(3), \fIengine\fR\|(3),
258 \&\fIDSA_new\fR\|(3),
259 \&\fIDSA_size\fR\|(3),
260 \&\fIDSA_generate_parameters\fR\|(3),
261 \&\fIDSA_dup_DH\fR\|(3),
262 \&\fIDSA_generate_key\fR\|(3),
263 \&\fIDSA_sign\fR\|(3), \fIDSA_set_method\fR\|(3),
264 \&\fIDSA_get_ex_new_index\fR\|(3),
265 \&\fIRSA_print\fR\|(3)