1 files changed, 156 insertions, 0 deletions
diff --git a/src/rsa.cpp b/src/rsa.cpp
new file mode 100644
index 000000000..c11733aa3
--- /dev/null
+++ b/src/rsa.cpp
@@ -0,0 +1,156 @@
+/*************************************************
+* RSA Source File                                *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/rsa.h>
+#include <botan/numthry.h>
+#include <botan/keypair.h>
+#include <botan/parsing.h>
+
+namespace Botan {
+
+/*************************************************
+* RSA_PublicKey Constructor                      *
+*************************************************/
+RSA_PublicKey::RSA_PublicKey(const BigInt& mod, const BigInt& exp)
+   {
+   n = mod;
+   e = exp;
+   X509_load_hook();
+   }
+
+/*************************************************
+* RSA Public Operation                           *
+*************************************************/
+BigInt RSA_PublicKey::public_op(const BigInt& i) const
+   {
+   if(i >= n)
+      throw Invalid_Argument(algo_name() + "::public_op: input is too large");
+   return core.public_op(i);
+   }
+
+/*************************************************
+* RSA Encryption Function                        *
+*************************************************/
+SecureVector<byte> RSA_PublicKey::encrypt(const byte in[], u32bit len) const
+   {
+   BigInt i(in, len);
+   return BigInt::encode_1363(public_op(i), n.bytes());
+   }
+
+/*************************************************
+* RSA Verification Function                      *
+*************************************************/
+SecureVector<byte> RSA_PublicKey::verify(const byte in[], u32bit len) const
+   {
+   BigInt i(in, len);
+   return BigInt::encode(public_op(i));
+   }
+
+/*************************************************
+* Create a RSA private key                       *
+*************************************************/
+RSA_PrivateKey::RSA_PrivateKey(u32bit bits, u32bit exp)
+   {
+   if(bits < 128)
+      throw Invalid_Argument(algo_name() + ": Can't make a key that is only " +
+                             to_string(bits) + " bits long");
+   if(exp < 3 || exp % 2 == 0)
+      throw Invalid_Argument(algo_name() + ": Invalid encryption exponent");
+
+   e = exp;
+   p = random_prime((bits + 1) / 2, e);
+   q = random_prime(bits - p.bits(), e);
+   d = inverse_mod(e, lcm(p - 1, q - 1));
+
+   PKCS8_load_hook();
+   check_generated_private();
+
+   if(n.bits() != bits)
+      throw Self_Test_Failure(algo_name() + " private key generation failed");
+   }
+
+/*************************************************
+* RSA_PrivateKey Constructor                     *
+*************************************************/
+RSA_PrivateKey::RSA_PrivateKey(const BigInt& prime1, const BigInt& prime2,
+                               const BigInt& exp, const BigInt& d_exp,
+                               const BigInt& mod)
+   {
+   p = prime1;
+   q = prime2;
+   e = exp;
+   d = d_exp;
+   n = mod;
+
+   if(d == 0)
+      d = inverse_mod(e, lcm(p - 1, q - 1));
+
+   PKCS8_load_hook();
+   check_loaded_private();
+   }
+
+/*************************************************
+* RSA Private Operation                          *
+*************************************************/
+BigInt RSA_PrivateKey::private_op(const byte in[], u32bit length) const
+   {
+   BigInt i(in, length);
+   if(i >= n)
+      throw Invalid_Argument(algo_name() + "::private_op: input is too large");
+
+   BigInt r = core.private_op(i);
+   if(i != public_op(r))
+      throw Self_Test_Failure(algo_name() + " private operation check failed");
+   return r;
+   }
+
+/*************************************************
+* RSA Decryption Operation                       *
+*************************************************/
+SecureVector<byte> RSA_PrivateKey::decrypt(const byte in[], u32bit len) const
+   {
+   return BigInt::encode(private_op(in, len));
+   }
+
+/*************************************************
+* RSA Signature Operation                        *
+*************************************************/
+SecureVector<byte> RSA_PrivateKey::sign(const byte in[], u32bit len) const
+   {
+   return BigInt::encode_1363(private_op(in, len), n.bytes());
+   }
+
+/*************************************************
+* Check Private RSA Parameters                   *
+*************************************************/
+bool RSA_PrivateKey::check_key(bool strong) const
+   {
+   if(!IF_Scheme_PrivateKey::check_key(strong))
+      return false;
+
+   if(!strong)
+      return true;
+
+   if((e * d) % lcm(p - 1, q - 1) != 1)
+      return false;
+
+   try {
+      KeyPair::check_key(get_pk_encryptor(*this, "EME1(SHA-1)"),
+                         get_pk_decryptor(*this, "EME1(SHA-1)")
+         );
+
+      KeyPair::check_key(get_pk_signer(*this, "EMSA4(SHA-1)"),
+                         get_pk_verifier(*this, "EMSA4(SHA-1)")
+         );
+      }
+   catch(Self_Test_Failure)
+      {
+      return false;
+      }
+
+   return true;
+   }
+
+}