NetBSD/lib/libcrypto/man/dsa.3

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.TH dsa 3 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.rm #[ #] #H #V #F C
.SH "NAME"
dsa \- Digital Signature Algorithm
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.PP
.Vb 1
\& #include <openssl/dsa.h>
.Ve
.Vb 2
\& DSA * DSA_new(void);
\& void DSA_free(DSA *dsa);
.Ve
.Vb 1
\& int DSA_size(DSA *dsa);
.Ve
.Vb 3
\& DSA * DSA_generate_parameters(int bits, unsigned char *seed,
\& int seed_len, int *counter_ret, unsigned long *h_ret,
\& void (*callback)(int, int, void *), void *cb_arg);
.Ve
.Vb 1
\& DH * DSA_dup_DH(DSA *r);
.Ve
.Vb 1
\& int DSA_generate_key(DSA *dsa);
.Ve
.Vb 6
\& int DSA_sign(int dummy, const unsigned char *dgst, int len,
\& unsigned char *sigret, unsigned int *siglen, DSA *dsa);
\& int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
\& BIGNUM **rp);
\& int DSA_verify(int dummy, const unsigned char *dgst, int len,
\& unsigned char *sigbuf, int siglen, DSA *dsa);
.Ve
.Vb 5
\& void DSA_set_default_method(DSA_METHOD *meth);
\& DSA_METHOD *DSA_get_default_method(void);
\& DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth);
\& DSA *DSA_new_method(DSA_METHOD *meth);
\& DSA_METHOD *DSA_OpenSSL(void);
.Ve
.Vb 4
\& int DSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
\& int (*dup_func)(), void (*free_func)());
\& int DSA_set_ex_data(DSA *d, int idx, char *arg);
\& char *DSA_get_ex_data(DSA *d, int idx);
.Ve
.Vb 4
\& DSA_SIG *DSA_SIG_new(void);
\& void DSA_SIG_free(DSA_SIG *a);
\& int i2d_DSA_SIG(DSA_SIG *a, unsigned char **pp);
\& DSA_SIG *d2i_DSA_SIG(DSA_SIG **v, unsigned char **pp, long length);
.Ve
.Vb 3
\& DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
\& int DSA_do_verify(const unsigned char *dgst, int dgst_len,
\& DSA_SIG *sig, DSA *dsa);
.Ve
.Vb 6
\& DSA * d2i_DSAPublicKey(DSA **a, unsigned char **pp, long length);
\& DSA * d2i_DSAPrivateKey(DSA **a, unsigned char **pp, long length);
\& DSA * d2i_DSAparams(DSA **a, unsigned char **pp, long length);
\& int i2d_DSAPublicKey(DSA *a, unsigned char **pp);
\& int i2d_DSAPrivateKey(DSA *a, unsigned char **pp);
\& int i2d_DSAparams(DSA *a,unsigned char **pp);
.Ve
.Vb 4
\& int DSAparams_print(BIO *bp, DSA *x);
\& int DSAparams_print_fp(FILE *fp, DSA *x);
\& int DSA_print(BIO *bp, DSA *x, int off);
\& int DSA_print_fp(FILE *bp, DSA *x, int off);
.Ve
.SH "DESCRIPTION"
These functions implement the Digital Signature Algorithm (DSA). The
generation of shared DSA parameters is described in
the \fIDSA_generate_parameters(3)|DSA_generate_parameters(3)\fR manpage;
the \fIDSA_generate_key(3)|DSA_generate_key(3)\fR manpage describes how to
generate a signature key. Signature generation and verification are
described in the \fIDSA_sign(3)|DSA_sign(3)\fR manpage.
.PP
The \fBDSA\fR structure consists of several BIGNUM components.
.PP
.Vb 10
\& struct
\& {
\& BIGNUM *p; // prime number (public)
\& BIGNUM *q; // 160-bit subprime, q | p-1 (public)
\& BIGNUM *g; // generator of subgroup (public)
\& BIGNUM *priv_key; // private key x
\& BIGNUM *pub_key; // public key y = g^x
\& // ...
\& }
\& DSA;
.Ve
In public keys, \fBpriv_key\fR is NULL.
.SH "CONFORMING TO"
US Federal Information Processing Standard FIPS 186 (Digital Signature
Standard, DSS), ANSI X9.30
.SH "SEE ALSO"
the \fIbn(3)|bn(3)\fR manpage, the \fIdh(3)|dh(3)\fR manpage, the \fIerr(3)|err(3)\fR manpage, the \fIrand(3)|rand(3)\fR manpage,
the \fIrsa(3)|rsa(3)\fR manpage, the \fIsha(3)|sha(3)\fR manpage, the \fIDSA_new(3)|DSA_new(3)\fR manpage,
the \fIDSA_size(3)|DSA_size(3)\fR manpage,
the \fIDSA_generate_parameters(3)|DSA_generate_parameters(3)\fR manpage,
the \fIDSA_dup_DH(3)|DSA_dup_DH(3)\fR manpage,
the \fIDSA_generate_key(3)|DSA_generate_key(3)\fR manpage,
the \fIDSA_sign(3)|DSA_sign(3)\fR manpage, the \fIDSA_set_method(3)|DSA_set_method(3)\fR manpage,
the \fIDSA_get_ex_new_index(3)|DSA_get_ex_new_index(3)\fR manpage,
the \fIRSA_print(3)|RSA_print(3)\fR manpage
.rn }` ''
.IX Title "dsa 3"
.IX Name "dsa - Digital Signature Algorithm"
.IX Header "NAME"
.IX Header "SYNOPSIS"
.IX Header "DESCRIPTION"
.IX Header "CONFORMING TO"
.IX Header "SEE ALSO"