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dsa(3)									dsa(3)

NAME
       dsa - Digital Signature Algorithm

SYNOPSIS
       #include <openssl/dsa.h> #include <openssl/engine.h>

       DSA * DSA_new(
	       void ); void DSA_free(
	       DSA *dsa ); int DSA_size(
	       DSA *dsa ); 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 ); DH * DSA_dup_DH(
	       DSA *r ); int   DSA_generate_key(
	       DSA *dsa ); 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 ); void DSA_set_default_openssl_method(
	       DSA_METHOD *meth ); DSA_METHOD *DSA_get_default_openssl_method(
	       void ); int DSA_set_method(
	       DSA *dsa,
	       ENGINE *engine ); DSA *DSA_new_method(
	       ENGINE *engine ); DSA_METHOD *DSA_OpenSSL(
	       void ); 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 ); 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 ); 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 ); 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 ); 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 );

DESCRIPTION
       These  functions	 implement the Digital Signature Algorithm (DSA).  The
       generation of shared DSA parameters is described in DSA_generate_paramÔÇÉ
       eters(3);  DSA_generate_key(3)  describes  how  to generate a signature
       key.  Signature	generation   and   verification	  are	described   in
       DSA_sign(3).

       The DSA structure consists of several BIGNUM components.
	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;

       In public keys, priv_key is NULL.

       DSA  conforms  to  US  Federal Information Processing Standard FIPS 186
       (Digital Signature Standard, DSS), ANSI X9.30

SEE ALSO
       Functions:  bn(3),  dh(3),   err(3),   rand_ssl(3),   rsa(3),   sha(3),
       DSA_new(3),   DSA_size(3),  DSA_generate_parameters(3),	DSA_dup_DH(3),
       DSA_generate_key(3),	     DSA_sign(3),	    DSA_set_method(3),
       DSA_get_ex_new_index(3), RSA_print(3)

									dsa(3)
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