Added stand-alone RSA/PSS implementation.

[BearSSL] / src / rsa / rsa_i32_pss_vrfy.c

diff --git a/src/rsa/rsa_i32_pss_vrfy.c b/src/rsa/rsa_i32_pss_vrfy.c
new file mode 100644 (file)
index 0000000..2e70d23
--- /dev/null
+++ b/src/rsa/rsa_i32_pss_vrfy.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2018 Thomas Pornin <pornin@bolet.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "inner.h"
+
+/* see bearssl_rsa.h */
+uint32_t
+br_rsa_i32_pss_vrfy(const unsigned char *x, size_t xlen,
+       const br_hash_class *hf_data, const br_hash_class *hf_mgf1,
+       const void *hash, size_t salt_len, const br_rsa_public_key *pk)
+{
+       unsigned char sig[BR_MAX_RSA_SIZE >> 3];
+
+       if (xlen > (sizeof sig)) {
+               return 0;
+       }
+       memcpy(sig, x, xlen);
+       if (!br_rsa_i32_public(sig, xlen, pk)) {
+               return 0;
+       }
+       return br_rsa_pss_sig_unpad(hf_data, hf_mgf1,
+               hash, salt_len, pk, sig);
+}