Update build for OpenSSL-0.9.8j upgrade.
[dragonfly.git] / secure / lib / libcrypto / man / DSA_set_method.3
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132.\" ========================================================================
133.\"
134.IX Title "DSA_set_method 3"
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135.TH DSA_set_method 3 "2009-01-11" "0.9.8j" "OpenSSL"
136.\" For nroff, turn off justification. Always turn off hyphenation; it makes
137.\" way too many mistakes in technical documents.
138.if n .ad l
139.nh
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140.SH "NAME"
141DSA_set_default_method, DSA_get_default_method,
74dab6c2 142DSA_set_method, DSA_new_method, DSA_OpenSSL \- select DSA method
984263bc 143.SH "SYNOPSIS"
8b0cefbb 144.IX Header "SYNOPSIS"
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145.Vb 2
146\& #include <openssl/dsa.h>
147\& #include <openssl/engine.h>
e257b235 148\&
984263bc 149\& void DSA_set_default_method(const DSA_METHOD *meth);
e257b235 150\&
984263bc 151\& const DSA_METHOD *DSA_get_default_method(void);
e257b235 152\&
984263bc 153\& int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);
e257b235 154\&
984263bc 155\& DSA *DSA_new_method(ENGINE *engine);
e257b235 156\&
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157\& DSA_METHOD *DSA_OpenSSL(void);
158.Ve
159.SH "DESCRIPTION"
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160.IX Header "DESCRIPTION"
161A \fB\s-1DSA_METHOD\s0\fR specifies the functions that OpenSSL uses for \s-1DSA\s0
984263bc 162operations. By modifying the method, alternative implementations
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163such as hardware accelerators may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for
164important information about how these \s-1DSA\s0 \s-1API\s0 functions are affected by the use
165of \fB\s-1ENGINE\s0\fR \s-1API\s0 calls.
984263bc 166.PP
8b0cefbb 167Initially, the default \s-1DSA_METHOD\s0 is the OpenSSL internal implementation,
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168as returned by \fIDSA_OpenSSL()\fR.
169.PP
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170\&\fIDSA_set_default_method()\fR makes \fBmeth\fR the default method for all \s-1DSA\s0
171structures created later. \fB\s-1NB\s0\fR: This is true only whilst no \s-1ENGINE\s0 has
172been set as a default for \s-1DSA\s0, so this function is no longer recommended.
984263bc 173.PP
8b0cefbb 174\&\fIDSA_get_default_method()\fR returns a pointer to the current default
aac4ff6f 175\&\s-1DSA_METHOD\s0. However, the meaningfulness of this result is dependent on
8b0cefbb 176whether the \s-1ENGINE\s0 \s-1API\s0 is being used, so this function is no longer
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177recommended.
178.PP
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179\&\fIDSA_set_method()\fR selects \fBmeth\fR to perform all operations using the key
180\&\fBrsa\fR. This will replace the \s-1DSA_METHOD\s0 used by the \s-1DSA\s0 key and if the
181previous method was supplied by an \s-1ENGINE\s0, the handle to that \s-1ENGINE\s0 will
182be released during the change. It is possible to have \s-1DSA\s0 keys that only
183work with certain \s-1DSA_METHOD\s0 implementations (eg. from an \s-1ENGINE\s0 module
984263bc 184that supports embedded hardware-protected keys), and in such cases
8b0cefbb 185attempting to change the \s-1DSA_METHOD\s0 for the key can have unexpected
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186results.
187.PP
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188\&\fIDSA_new_method()\fR allocates and initializes a \s-1DSA\s0 structure so that \fBengine\fR
189will be used for the \s-1DSA\s0 operations. If \fBengine\fR is \s-1NULL\s0, the default engine
190for \s-1DSA\s0 operations is used, and if no default \s-1ENGINE\s0 is set, the \s-1DSA_METHOD\s0
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191controlled by \fIDSA_set_default_method()\fR is used.
192.SH "THE DSA_METHOD STRUCTURE"
8b0cefbb 193.IX Header "THE DSA_METHOD STRUCTURE"
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194struct
195 {
196 /* name of the implementation */
197 const char *name;
198.PP
199.Vb 3
200\& /* sign */
201\& DSA_SIG *(*dsa_do_sign)(const unsigned char *dgst, int dlen,
202\& DSA *dsa);
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203\&
204\& /* pre\-compute k^\-1 and r */
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205\& int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
206\& BIGNUM **rp);
e257b235 207\&
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208\& /* verify */
209\& int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
210\& DSA_SIG *sig, DSA *dsa);
e257b235 211\&
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212\& /* compute rr = a1^p1 * a2^p2 mod m (May be NULL for some
213\& implementations) */
214\& int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
215\& BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
216\& BN_CTX *ctx, BN_MONT_CTX *in_mont);
e257b235 217\&
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218\& /* compute r = a ^ p mod m (May be NULL for some implementations) */
219\& int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a,
220\& const BIGNUM *p, const BIGNUM *m,
221\& BN_CTX *ctx, BN_MONT_CTX *m_ctx);
e257b235 222\&
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223\& /* called at DSA_new */
224\& int (*init)(DSA *DSA);
e257b235 225\&
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226\& /* called at DSA_free */
227\& int (*finish)(DSA *DSA);
e257b235 228\&
984263bc 229\& int flags;
e257b235 230\&
984263bc 231\& char *app_data; /* ?? */
e257b235 232\&
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233\& } DSA_METHOD;
234.Ve
235.SH "RETURN VALUES"
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236.IX Header "RETURN VALUES"
237\&\fIDSA_OpenSSL()\fR and \fIDSA_get_default_method()\fR return pointers to the respective
238\&\fB\s-1DSA_METHOD\s0\fRs.
984263bc 239.PP
8b0cefbb 240\&\fIDSA_set_default_method()\fR returns no value.
984263bc 241.PP
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242\&\fIDSA_set_method()\fR returns non-zero if the provided \fBmeth\fR was successfully set as
243the method for \fBdsa\fR (including unloading the \s-1ENGINE\s0 handle if the previous
244method was supplied by an \s-1ENGINE\s0).
984263bc 245.PP
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246\&\fIDSA_new_method()\fR returns \s-1NULL\s0 and sets an error code that can be
247obtained by \fIERR_get_error\fR\|(3) if the allocation
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248fails. Otherwise it returns a pointer to the newly allocated structure.
249.SH "NOTES"
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250.IX Header "NOTES"
251As of version 0.9.7, \s-1DSA_METHOD\s0 implementations are grouped together with other
252algorithmic APIs (eg. \s-1RSA_METHOD\s0, \s-1EVP_CIPHER\s0, etc) in \fB\s-1ENGINE\s0\fR modules. If a
253default \s-1ENGINE\s0 is specified for \s-1DSA\s0 functionality using an \s-1ENGINE\s0 \s-1API\s0 function,
254that will override any \s-1DSA\s0 defaults set using the \s-1DSA\s0 \s-1API\s0 (ie.
255\&\fIDSA_set_default_method()\fR). For this reason, the \s-1ENGINE\s0 \s-1API\s0 is the recommended way
256to control default implementations for use in \s-1DSA\s0 and other cryptographic
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257algorithms.
258.SH "SEE ALSO"
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259.IX Header "SEE ALSO"
260\&\fIdsa\fR\|(3), \fIDSA_new\fR\|(3)
984263bc 261.SH "HISTORY"
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262.IX Header "HISTORY"
263\&\fIDSA_set_default_method()\fR, \fIDSA_get_default_method()\fR, \fIDSA_set_method()\fR,
264\&\fIDSA_new_method()\fR and \fIDSA_OpenSSL()\fR were added in OpenSSL 0.9.4.
984263bc 265.PP
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266\&\fIDSA_set_default_openssl_method()\fR and \fIDSA_get_default_openssl_method()\fR replaced
267\&\fIDSA_set_default_method()\fR and \fIDSA_get_default_method()\fR respectively, and
268\&\fIDSA_set_method()\fR and \fIDSA_new_method()\fR were altered to use \fB\s-1ENGINE\s0\fRs rather than
269\&\fB\s-1DSA_METHOD\s0\fRs during development of the engine version of OpenSSL 0.9.6. For
2700.9.7, the handling of defaults in the \s-1ENGINE\s0 \s-1API\s0 was restructured so that this
984263bc 271change was reversed, and behaviour of the other functions resembled more closely
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272the previous behaviour. The behaviour of defaults in the \s-1ENGINE\s0 \s-1API\s0 now
273transparently overrides the behaviour of defaults in the \s-1DSA\s0 \s-1API\s0 without
984263bc 274requiring changing these function prototypes.