1 files changed, 64 insertions, 0 deletions
diff --git a/external/nettle-3.3/nettle/rsa-verify.c b/external/nettle-3.3/nettle/rsa-verify.c
new file mode 100644
index 0000000..8484a85
--- /dev/null
+++ b/external/nettle-3.3/nettle/rsa-verify.c
@@ -0,0 +1,64 @@
+/* rsa-verify.c
+
+   Verifying RSA signatures.
+
+   Copyright (C) 2001, 2003 Niels Möller
+
+   This file is part of GNU Nettle.
+
+   GNU Nettle is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or both in parallel, as here.
+
+   GNU Nettle is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see http://www.gnu.org/licenses/.
+*/
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "rsa.h"
+
+#include "bignum.h"
+
+int
+_rsa_verify(const struct rsa_public_key *key,
+	    const mpz_t m,
+	    const mpz_t s)
+{
+  int res;
+  
+  mpz_t m1;
+  
+  if ( (mpz_sgn(s) <= 0)
+       || (mpz_cmp(s, key->n) >= 0) )
+    return 0;
+       
+  mpz_init(m1);
+  
+  mpz_powm(m1, s, key->e, key->n);
+
+  res = !mpz_cmp(m, m1);
+
+  mpz_clear(m1);
+
+  return res;
+}