libcrypto backwards compatibility

configure.ac

@@ -26,6 +26,10 @@ AC_CHECK_LIB([crypto],
 	[EVP_MD_CTX_free],
 	[AC_DEFINE([HAVE_EVP_MD_CTX_FREE], [],
 	 [Libcrypto has EVP_MD_CTX_free])])
+AC_CHECK_LIB([crypto],
+	[RSA_set0_key],
+	[AC_DEFINE([HAVE_RSA_SET0_KEY], [],
+	 [Libcrypto has RSA_set0_key])])
 
 AC_CHECK_PROGS(BASE64, [base64], [no])
 test "$BASE64" == "no" && AC_MSG_ERROR([Required program 'base64' not found.])

src/vmod_crypto.c

@@ -124,7 +124,7 @@ fini(void)
 
 /*
  * ------------------------------------------------------------
- * libcryto housekeeping
+ * libcryto compat
  */
 
 #ifndef HAVE_EVP_MD_CTX_FREE
@@ -132,6 +132,37 @@ fini(void)
 #define EVP_MD_CTX_new() EVP_MD_CTX_create()
 #endif
 
+#ifndef HAVE_RSA_SET0_KEY
+/* from openssl crypto/rsa/rsa_lib.c */
+static int
+RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
+{
+    /* If the fields n and e in r are NULL, the corresponding input
+     * parameters MUST be non-NULL for n and e.	 d may be
+     * left NULL (in case only the public key is used).
+     */
+    if ((r->n == NULL && n == NULL)
+	|| (r->e == NULL && e == NULL))
+	return 0;
+
+    if (n != NULL) {
+	BN_free(r->n);
+	r->n = n;
+    }
+    if (e != NULL) {
+	BN_free(r->e);
+	r->e = e;
+    }
+    if (d != NULL) {
+	BN_clear_free(r->d);
+	r->d = d;
+	BN_set_flags(r->d, BN_FLG_CONSTTIME);
+    }
+
+    return 1;
+}
+#endif
+
 /*
  * ------------------------------------------------------------
  * $Object key()