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dsa(3)				    OpenSSL				dsa(3)

NAME
       dsa - Digital Signature Algorithm

SYNOPSIS
	#include <openssl/dsa.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_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);

	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_parameters(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.

CONFORMING TO
       US Federal Information Processing Standard FIPS 186 (Digital Signature
       Standard, DSS), ANSI X9.30

SEE ALSO
       bn(3), dh(3), err(3), rand(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)

3rd Berkeley Distribution	    0.9.6m				dsa(3)
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