241 lines
7.9 KiB
Groff
241 lines
7.9 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "dsa 3"
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.TH dsa 3 "2013-02-11" "1.0.1e" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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dsa \- Digital Signature Algorithm
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 2
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\& #include <openssl/dsa.h>
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\& #include <openssl/engine.h>
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\&
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\& DSA * DSA_new(void);
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\& void DSA_free(DSA *dsa);
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\&
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\& int DSA_size(const DSA *dsa);
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\&
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\& DSA * DSA_generate_parameters(int bits, unsigned char *seed,
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\& int seed_len, int *counter_ret, unsigned long *h_ret,
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\& void (*callback)(int, int, void *), void *cb_arg);
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\&
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\& DH * DSA_dup_DH(const DSA *r);
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\&
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\& int DSA_generate_key(DSA *dsa);
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\&
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\& int DSA_sign(int dummy, const unsigned char *dgst, int len,
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\& unsigned char *sigret, unsigned int *siglen, DSA *dsa);
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\& int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
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\& BIGNUM **rp);
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\& int DSA_verify(int dummy, const unsigned char *dgst, int len,
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\& const unsigned char *sigbuf, int siglen, DSA *dsa);
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\&
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\& void DSA_set_default_method(const DSA_METHOD *meth);
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\& const DSA_METHOD *DSA_get_default_method(void);
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\& int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);
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\& DSA *DSA_new_method(ENGINE *engine);
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\& const DSA_METHOD *DSA_OpenSSL(void);
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\&
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\& int DSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
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\& int (*dup_func)(), void (*free_func)());
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\& int DSA_set_ex_data(DSA *d, int idx, char *arg);
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\& char *DSA_get_ex_data(DSA *d, int idx);
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\&
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\& DSA_SIG *DSA_SIG_new(void);
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\& void DSA_SIG_free(DSA_SIG *a);
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\& int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
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\& DSA_SIG *d2i_DSA_SIG(DSA_SIG **v, unsigned char **pp, long length);
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\&
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\& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
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\& int DSA_do_verify(const unsigned char *dgst, int dgst_len,
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\& DSA_SIG *sig, DSA *dsa);
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\&
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\& DSA * d2i_DSAPublicKey(DSA **a, unsigned char **pp, long length);
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\& DSA * d2i_DSAPrivateKey(DSA **a, unsigned char **pp, long length);
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\& DSA * d2i_DSAparams(DSA **a, unsigned char **pp, long length);
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\& int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
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\& int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
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\& int i2d_DSAparams(const DSA *a,unsigned char **pp);
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\&
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\& int DSAparams_print(BIO *bp, const DSA *x);
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\& int DSAparams_print_fp(FILE *fp, const DSA *x);
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\& int DSA_print(BIO *bp, const DSA *x, int off);
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\& int DSA_print_fp(FILE *bp, const DSA *x, int off);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions implement the Digital Signature Algorithm (\s-1DSA\s0). The
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generation of shared \s-1DSA\s0 parameters is described in
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\&\fIDSA_generate_parameters\fR\|(3);
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\&\fIDSA_generate_key\fR\|(3) describes how to
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generate a signature key. Signature generation and verification are
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described in \fIDSA_sign\fR\|(3).
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.PP
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The \fB\s-1DSA\s0\fR structure consists of several \s-1BIGNUM\s0 components.
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.PP
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.Vb 10
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\& struct
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\& {
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\& BIGNUM *p; // prime number (public)
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\& BIGNUM *q; // 160\-bit subprime, q | p\-1 (public)
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\& BIGNUM *g; // generator of subgroup (public)
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\& BIGNUM *priv_key; // private key x
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\& BIGNUM *pub_key; // public key y = g^x
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\& // ...
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\& }
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\& DSA;
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.Ve
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.PP
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In public keys, \fBpriv_key\fR is \s-1NULL\s0.
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.PP
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Note that \s-1DSA\s0 keys may use non-standard \fB\s-1DSA_METHOD\s0\fR implementations,
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either directly or by the use of \fB\s-1ENGINE\s0\fR modules. In some cases (eg. an
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\&\s-1ENGINE\s0 providing support for hardware-embedded keys), these \s-1BIGNUM\s0 values
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will not be used by the implementation or may be used for alternative data
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storage. For this reason, applications should generally avoid using \s-1DSA\s0
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structure elements directly and instead use \s-1API\s0 functions to query or
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modify keys.
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.SH "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 186 (Digital Signature
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Standard, \s-1DSS\s0), \s-1ANSI\s0 X9.30
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIbn\fR\|(3), \fIdh\fR\|(3), \fIerr\fR\|(3), \fIrand\fR\|(3),
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\&\fIrsa\fR\|(3), \fIsha\fR\|(3), \fIengine\fR\|(3),
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\&\fIDSA_new\fR\|(3),
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\&\fIDSA_size\fR\|(3),
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\&\fIDSA_generate_parameters\fR\|(3),
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\&\fIDSA_dup_DH\fR\|(3),
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\&\fIDSA_generate_key\fR\|(3),
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\&\fIDSA_sign\fR\|(3), \fIDSA_set_method\fR\|(3),
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\&\fIDSA_get_ex_new_index\fR\|(3),
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\&\fIRSA_print\fR\|(3)
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