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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)









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Created 1996-2024 by Maxim Chirkov

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