Make DSA_METHOD opaque

Move the dsa_method structure out of the public header file, and provide
getter and setter functions for creating and modifying custom DSA_METHODs.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Stephen Henson <steve@openssl.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/crypto/dsa/dsa_locl.h b/crypto/dsa/dsa_locl.h
index 9b25634ae3..657fbff64f 100644
--- a/crypto/dsa/dsa_locl.h
+++ b/crypto/dsa/dsa_locl.h
@@ -77,6 +77,32 @@ struct dsa_st {
     CRYPTO_RWLOCK *lock;
 };
 
+struct dsa_method {
+    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);
+    /* Can be null */
+    int (*bn_mod_exp) (DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
+                       const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
+    int (*init) (DSA *dsa);
+    int (*finish) (DSA *dsa);
+    int flags;
+    void *app_data;
+    /* If this is non-NULL, it is used to generate DSA parameters */
+    int (*dsa_paramgen) (DSA *dsa, int bits,
+                         const unsigned char *seed, int seed_len,
+                         int *counter_ret, unsigned long *h_ret,
+                         BN_GENCB *cb);
+    /* If this is non-NULL, it is used to generate DSA keys */
+    int (*dsa_keygen) (DSA *dsa);
+};
+
 int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
                          const EVP_MD *evpmd, const unsigned char *seed_in,
                          size_t seed_len, unsigned char *seed_out,