+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct dsa_st DSA;
+
+typedef struct DSA_SIG_st
+ {
+ BIGNUM *r;
+ BIGNUM *s;
+ } DSA_SIG;
+
+typedef struct dsa_method {
+ const char *name;
+ DSA_SIG * (*dsa_do_sign)(const unsigned char *dgst, int dlen, DSA *dsa);
+ int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
+ BIGNUM **rp);
+ int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
+ DSA_SIG *sig, DSA *dsa);
+ int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
+ BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
+ BN_MONT_CTX *in_mont);
+ int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx,
+ BN_MONT_CTX *m_ctx); /* Can be null */
+ int (*init)(DSA *dsa);
+ int (*finish)(DSA *dsa);
+ int flags;
+ char *app_data;
+} DSA_METHOD;
+
+struct dsa_st