Add flags for DH FIPS method.

Update/fix prototypes in fips.h

crypto/dh/dh.h

@@ -88,6 +88,21 @@
                                        * be used for all exponents.
                                        */
 
+/* If this flag is set the DH method is FIPS compliant and can be used
+ * in FIPS mode. This is set in the validated module method. If an
+ * application sets this flag in its own methods it is its reposibility
+ * to ensure the result is compliant.
+ */
+
+#define DH_FLAG_FIPS_METHOD			0x0400
+
+/* If this flag is set the operations normally disabled in FIPS mode are
+ * permitted it is then the applications responsibility to ensure that the
+ * usage is compliant.
+ */
+
+#define DH_FLAG_NON_FIPS_ALLOW			0x0400
+
 #ifdef  __cplusplus
 extern "C" {
 #endif

crypto/dh/dh_key.c

@@ -108,7 +108,7 @@ compute_key,
 dh_bn_mod_exp,
 dh_init,
 dh_finish,
-0,
+DH_FLAG_FIPS_METHOD,
 NULL,
 NULL
 };

fips/fips.h

@@ -74,6 +74,7 @@ struct evp_cipher_st;
 struct evp_cipher_ctx_st;
 struct ec_method_st;
 struct ecdsa_method;
+struct dh_method;
 
 int FIPS_module_mode_set(int onoff);
 int FIPS_module_mode(void);
@@ -275,16 +276,18 @@ const EVP_MD *FIPS_evp_ecdsa(void);
 const RSA_METHOD *FIPS_rsa_pkcs1_ssleay(void);
 int FIPS_rsa_generate_key_ex(RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
 
-struct ec_method_st *fips_ec_gf2m_simple_method(void);
-struct ec_method_st *fips_ec_gfp_simple_method(void);
-struct ec_method_st *fips_ec_gfp_mont_method(void);
-struct ec_method_st *fips_ec_gfp_nist_method(void);
+const struct ec_method_st *fips_ec_gf2m_simple_method(void);
+const struct ec_method_st *fips_ec_gfp_simple_method(void);
+const struct ec_method_st *fips_ec_gfp_mont_method(void);
+const struct ec_method_st *fips_ec_gfp_nist_method(void);
 
-struct ecdsa_method *FIPS_ecdsa_openssl(void);
-struct ecdh_method *FIPS_ecdh_openssl(void);
+const struct ecdsa_method *FIPS_ecdsa_openssl(void);
+const struct ecdh_method *FIPS_ecdh_openssl(void);
 
 int FIPS_ec_key_generate_key(struct ec_key_st *key);
 
+const struct dh_method *FIPS_dh_openssl(void);
+
 #endif
 
 /* Where necessary redirect standard OpenSSL APIs to FIPS versions */