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+.\" Automatically generated by Pod::Man version 1.15
+.\" Thu May 9 13:19:15 2002
+.\"
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+.\" ======================================================================
+.\"
+.IX Title "DSA 1"
+.TH DSA 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+dsa \- Digital Signature Algorithm
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.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"
+.IX Header "DESCRIPTION"
+These functions implement the Digital Signature Algorithm (\s-1DSA\s0). The
+generation of shared \s-1DSA\s0 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).
+.PP
+The \fB\s-1DSA\s0\fR structure consists of several \s-1BIGNUM\s0 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 \s-1NULL\s0.
+.SH "CONFORMING TO"
+.IX Header "CONFORMING TO"
+\&\s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 186 (Digital Signature
+Standard, \s-1DSS\s0), \s-1ANSI\s0 X9.30
+.SH "SEE ALSO"
+.IX Header "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)
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