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141 .TH dsa 3 "0.9.6e" "2000-04-13" "OpenSSL"
144 dsa \- Digital Signature Algorithm
146 .IX Header "SYNOPSIS"
148 \& #include <openssl/dsa.h>
151 \& DSA * DSA_new(void);
152 \& void DSA_free(DSA *dsa);
155 \& int DSA_size(DSA *dsa);
158 \& DSA * DSA_generate_parameters(int bits, unsigned char *seed,
159 \& int seed_len, int *counter_ret, unsigned long *h_ret,
160 \& void (*callback)(int, int, void *), void *cb_arg);
163 \& DH * DSA_dup_DH(DSA *r);
166 \& int DSA_generate_key(DSA *dsa);
169 \& int DSA_sign(int dummy, const unsigned char *dgst, int len,
170 \& unsigned char *sigret, unsigned int *siglen, DSA *dsa);
171 \& int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
173 \& int DSA_verify(int dummy, const unsigned char *dgst, int len,
174 \& unsigned char *sigbuf, int siglen, DSA *dsa);
177 \& void DSA_set_default_method(DSA_METHOD *meth);
178 \& DSA_METHOD *DSA_get_default_method(void);
179 \& DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth);
180 \& DSA *DSA_new_method(DSA_METHOD *meth);
181 \& DSA_METHOD *DSA_OpenSSL(void);
184 \& int DSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
185 \& int (*dup_func)(), void (*free_func)());
186 \& int DSA_set_ex_data(DSA *d, int idx, char *arg);
187 \& 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(DSA_SIG *a, unsigned char **pp);
193 \& DSA_SIG *d2i_DSA_SIG(DSA_SIG **v, unsigned char **pp, long length);
196 \& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
197 \& int DSA_do_verify(const unsigned char *dgst, int dgst_len,
198 \& DSA_SIG *sig, DSA *dsa);
201 \& DSA * d2i_DSAPublicKey(DSA **a, unsigned char **pp, long length);
202 \& DSA * d2i_DSAPrivateKey(DSA **a, unsigned char **pp, long length);
203 \& DSA * d2i_DSAparams(DSA **a, unsigned char **pp, long length);
204 \& int i2d_DSAPublicKey(DSA *a, unsigned char **pp);
205 \& int i2d_DSAPrivateKey(DSA *a, unsigned char **pp);
206 \& int i2d_DSAparams(DSA *a,unsigned char **pp);
209 \& int DSAparams_print(BIO *bp, DSA *x);
210 \& int DSAparams_print_fp(FILE *fp, DSA *x);
211 \& int DSA_print(BIO *bp, DSA *x, int off);
212 \& int DSA_print_fp(FILE *bp, DSA *x, int off);
215 .IX Header "DESCRIPTION"
216 These functions implement the Digital Signature Algorithm (\s-1DSA\s0). The
217 generation of shared \s-1DSA\s0 parameters is described in
218 DSA_generate_parameters(3);
219 DSA_generate_key(3) describes how to
220 generate a signature key. Signature generation and verification are
221 described in DSA_sign(3).
223 The \fB\s-1DSA\s0\fR structure consists of several \s-1BIGNUM\s0 components.
228 \& BIGNUM *p; // prime number (public)
229 \& BIGNUM *q; // 160-bit subprime, q | p-1 (public)
230 \& BIGNUM *g; // generator of subgroup (public)
231 \& BIGNUM *priv_key; // private key x
232 \& BIGNUM *pub_key; // public key y = g^x
237 In public keys, \fBpriv_key\fR is \s-1NULL\s0.
239 .IX Header "CONFORMING TO"
240 \&\s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 186 (Digital Signature
241 Standard, \s-1DSS\s0), \s-1ANSI\s0 X9.30
243 .IX Header "SEE ALSO"
244 bn(3), dh(3), err(3), rand(3),
245 rsa(3), sha(3), DSA_new(3),
247 DSA_generate_parameters(3),
250 DSA_sign(3), DSA_set_method(3),
251 DSA_get_ex_new_index(3),