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Diffstat (limited to 'secure/lib/libcrypto/man/DSA_set_method.3')
| -rw-r--r-- | secure/lib/libcrypto/man/DSA_set_method.3 | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/DSA_set_method.3 b/secure/lib/libcrypto/man/DSA_set_method.3 new file mode 100644 index 0000000..ba984e0 --- /dev/null +++ b/secure/lib/libcrypto/man/DSA_set_method.3 @@ -0,0 +1,275 @@ +.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28) +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. \*(C+ will +.\" give a nicer C++. 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Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +DSA_set_default_method, DSA_get_default_method, +DSA_set_method, DSA_new_method, DSA_OpenSSL \- select DSA method +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 2 +\& #include <openssl/dsa.h> +\& #include <openssl/engine.h> +\& +\& void DSA_set_default_method(const DSA_METHOD *meth); +\& +\& const DSA_METHOD *DSA_get_default_method(void); +\& +\& int DSA_set_method(DSA *dsa, const DSA_METHOD *meth); +\& +\& DSA *DSA_new_method(ENGINE *engine); +\& +\& DSA_METHOD *DSA_OpenSSL(void); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +A \fB\s-1DSA_METHOD\s0\fR specifies the functions that OpenSSL uses for \s-1DSA\s0 +operations. By modifying the method, alternative implementations +such as hardware accelerators may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for +important information about how these \s-1DSA API\s0 functions are affected by the use +of \fB\s-1ENGINE\s0\fR \s-1API\s0 calls. +.PP +Initially, the default \s-1DSA_METHOD\s0 is the OpenSSL internal implementation, +as returned by \fIDSA_OpenSSL()\fR. +.PP +\&\fIDSA_set_default_method()\fR makes \fBmeth\fR the default method for all \s-1DSA\s0 +structures created later. \fB\s-1NB\s0\fR: This is true only whilst no \s-1ENGINE\s0 has +been set as a default for \s-1DSA,\s0 so this function is no longer recommended. +.PP +\&\fIDSA_get_default_method()\fR returns a pointer to the current default +\&\s-1DSA_METHOD.\s0 However, the meaningfulness of this result is dependent on +whether the \s-1ENGINE API\s0 is being used, so this function is no longer +recommended. +.PP +\&\fIDSA_set_method()\fR selects \fBmeth\fR to perform all operations using the key +\&\fBrsa\fR. This will replace the \s-1DSA_METHOD\s0 used by the \s-1DSA\s0 key and if the +previous method was supplied by an \s-1ENGINE,\s0 the handle to that \s-1ENGINE\s0 will +be released during the change. It is possible to have \s-1DSA\s0 keys that only +work with certain \s-1DSA_METHOD\s0 implementations (eg. from an \s-1ENGINE\s0 module +that supports embedded hardware-protected keys), and in such cases +attempting to change the \s-1DSA_METHOD\s0 for the key can have unexpected +results. +.PP +\&\fIDSA_new_method()\fR allocates and initializes a \s-1DSA\s0 structure so that \fBengine\fR +will be used for the \s-1DSA\s0 operations. If \fBengine\fR is \s-1NULL,\s0 the default engine +for \s-1DSA\s0 operations is used, and if no default \s-1ENGINE\s0 is set, the \s-1DSA_METHOD\s0 +controlled by \fIDSA_set_default_method()\fR is used. +.SH "THE DSA_METHOD STRUCTURE" +.IX Header "THE DSA_METHOD STRUCTURE" +struct + { + /* name of the implementation */ + const char *name; +.PP +.Vb 3 +\& /* sign */ +\& DSA_SIG *(*dsa_do_sign)(const unsigned char *dgst, int dlen, +\& DSA *dsa); +\& +\& /* pre\-compute k^\-1 and r */ +\& int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, +\& BIGNUM **rp); +\& +\& /* verify */ +\& int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len, +\& DSA_SIG *sig, DSA *dsa); +\& +\& /* compute rr = a1^p1 * a2^p2 mod m (May be NULL for some +\& implementations) */ +\& int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1, +\& BIGNUM *a2, BIGNUM *p2, BIGNUM *m, +\& BN_CTX *ctx, BN_MONT_CTX *in_mont); +\& +\& /* compute r = a ^ p mod m (May be NULL for some implementations) */ +\& int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, +\& const BIGNUM *p, const BIGNUM *m, +\& BN_CTX *ctx, BN_MONT_CTX *m_ctx); +\& +\& /* called at DSA_new */ +\& int (*init)(DSA *DSA); +\& +\& /* called at DSA_free */ +\& int (*finish)(DSA *DSA); +\& +\& int flags; +\& +\& char *app_data; /* ?? */ +\& +\& } DSA_METHOD; +.Ve +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIDSA_OpenSSL()\fR and \fIDSA_get_default_method()\fR return pointers to the respective +\&\fB\s-1DSA_METHOD\s0\fRs. +.PP +\&\fIDSA_set_default_method()\fR returns no value. +.PP +\&\fIDSA_set_method()\fR returns non-zero if the provided \fBmeth\fR was successfully set as +the method for \fBdsa\fR (including unloading the \s-1ENGINE\s0 handle if the previous +method was supplied by an \s-1ENGINE\s0). +.PP +\&\fIDSA_new_method()\fR returns \s-1NULL\s0 and sets an error code that can be +obtained by \fIERR_get_error\fR\|(3) if the allocation +fails. Otherwise it returns a pointer to the newly allocated structure. +.SH "NOTES" +.IX Header "NOTES" +As of version 0.9.7, \s-1DSA_METHOD\s0 implementations are grouped together with other +algorithmic APIs (eg. \s-1RSA_METHOD, EVP_CIPHER,\s0 etc) in \fB\s-1ENGINE\s0\fR modules. If a +default \s-1ENGINE\s0 is specified for \s-1DSA\s0 functionality using an \s-1ENGINE API\s0 function, +that will override any \s-1DSA\s0 defaults set using the \s-1DSA API \s0(ie. +\&\fIDSA_set_default_method()\fR). For this reason, the \s-1ENGINE API\s0 is the recommended way +to control default implementations for use in \s-1DSA\s0 and other cryptographic +algorithms. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIdsa\fR\|(3), \fIDSA_new\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIDSA_set_default_method()\fR, \fIDSA_get_default_method()\fR, \fIDSA_set_method()\fR, +\&\fIDSA_new_method()\fR and \fIDSA_OpenSSL()\fR were added in OpenSSL 0.9.4. +.PP +\&\fIDSA_set_default_openssl_method()\fR and \fIDSA_get_default_openssl_method()\fR replaced +\&\fIDSA_set_default_method()\fR and \fIDSA_get_default_method()\fR respectively, and +\&\fIDSA_set_method()\fR and \fIDSA_new_method()\fR were altered to use \fB\s-1ENGINE\s0\fRs rather than +\&\fB\s-1DSA_METHOD\s0\fRs during development of the engine version of OpenSSL 0.9.6. For +0.9.7, the handling of defaults in the \s-1ENGINE API\s0 was restructured so that this +change was reversed, and behaviour of the other functions resembled more closely +the previous behaviour. The behaviour of defaults in the \s-1ENGINE API\s0 now +transparently overrides the behaviour of defaults in the \s-1DSA API\s0 without +requiring changing these function prototypes. |
