257 lines
7.4 KiB
Groff
257 lines
7.4 KiB
Groff
.\" $NetBSD: openssl_dsa.3,v 1.1 2001/04/12 10:45:47 itojun Exp $
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.\" Automatically generated by Pod::Man version 1.02
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.\" Thu Apr 12 19:27:11 2001
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.\" ======================================================================
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.\"
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.IX Title "dsa 3"
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.TH dsa 3 "0.9.6a" "2000-07-22" "OpenSSL"
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.UC
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.SH "NAME"
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dsa \- Digital Signature Algorithm
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/dsa.h>
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.Ve
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.Vb 2
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\& DSA * DSA_new(void);
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\& void DSA_free(DSA *dsa);
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.Ve
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.Vb 1
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\& int DSA_size(DSA *dsa);
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.Ve
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.Vb 3
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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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.Ve
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.Vb 1
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\& DH * DSA_dup_DH(DSA *r);
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.Ve
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.Vb 1
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\& int DSA_generate_key(DSA *dsa);
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.Ve
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.Vb 6
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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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\& unsigned char *sigbuf, int siglen, DSA *dsa);
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.Ve
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.Vb 5
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\& void DSA_set_default_method(DSA_METHOD *meth);
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\& DSA_METHOD *DSA_get_default_method(void);
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\& DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth);
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\& DSA *DSA_new_method(DSA_METHOD *meth);
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\& DSA_METHOD *DSA_OpenSSL(void);
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.Ve
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.Vb 4
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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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.Ve
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.Vb 4
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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(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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.Ve
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.Vb 3
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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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.Ve
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.Vb 6
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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(DSA *a, unsigned char **pp);
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\& int i2d_DSAPrivateKey(DSA *a, unsigned char **pp);
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\& int i2d_DSAparams(DSA *a,unsigned char **pp);
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.Ve
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.Vb 4
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\& int DSAparams_print(BIO *bp, DSA *x);
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\& int DSAparams_print_fp(FILE *fp, DSA *x);
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\& int DSA_print(BIO *bp, DSA *x, int off);
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\& int DSA_print_fp(FILE *bp, 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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DSA_generate_parameters(3);
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DSA_generate_key(3) describes how to
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generate a signature key. Signature generation and verification are
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described in DSA_sign(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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In public keys, \fBpriv_key\fR is \s-1NULL\s0.
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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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openssl_bn(3), openssl_dh(3), openssl_err(3), openssl_rand(3),
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openssl_rsa(3), openssl_sha(3), DSA_new(3),
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DSA_size(3),
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DSA_generate_parameters(3),
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DSA_dup_DH(3),
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DSA_generate_key(3),
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DSA_sign(3), DSA_set_method(3),
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DSA_get_ex_new_index(3),
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RSA_print(3)
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