1 files changed, 78 insertions, 0 deletions
diff --git a/Crypto/src/crypto/engines/RsaEngine.cs b/Crypto/src/crypto/engines/RsaEngine.cs
new file mode 100644
index 000000000..7e6dfb163
--- /dev/null
+++ b/Crypto/src/crypto/engines/RsaEngine.cs
@@ -0,0 +1,78 @@
+using System;
+
+namespace Org.BouncyCastle.Crypto.Engines
+{
+ /**
+ * this does your basic RSA algorithm.
+ */
+ public class RsaEngine
+ : IAsymmetricBlockCipher
+ {
+ private RsaCoreEngine core;
+
+ public string AlgorithmName
+ {
+ get { return "RSA"; }
+ }
+
+ /**
+ * initialise the RSA engine.
+ *
+ * @param forEncryption true if we are encrypting, false otherwise.
+ * @param param the necessary RSA key parameters.
+ */
+ public void Init(
+ bool forEncryption,
+ ICipherParameters parameters)
+ {
+ if (core == null)
+ core = new RsaCoreEngine();
+
+ core.Init(forEncryption, parameters);
+ }
+
+ /**
+ * Return the maximum size for an input block to this engine.
+ * For RSA this is always one byte less than the key size on
+ * encryption, and the same length as the key size on decryption.
+ *
+ * @return maximum size for an input block.
+ */
+ public int GetInputBlockSize()
+ {
+ return core.GetInputBlockSize();
+ }
+
+ /**
+ * Return the maximum size for an output block to this engine.
+ * For RSA this is always one byte less than the key size on
+ * decryption, and the same length as the key size on encryption.
+ *
+ * @return maximum size for an output block.
+ */
+ public int GetOutputBlockSize()
+ {
+ return core.GetOutputBlockSize();
+ }
+
+ /**
+ * Process a single block using the basic RSA algorithm.
+ *
+ * @param inBuf the input array.
+ * @param inOff the offset into the input buffer where the data starts.
+ * @param inLen the length of the data to be processed.
+ * @return the result of the RSA process.
+ * @exception DataLengthException the input block is too large.
+ */
+ public byte[] ProcessBlock(
+ byte[] inBuf,
+ int inOff,
+ int inLen)
+ {
+ if (core == null)
+ throw new InvalidOperationException("RSA engine not initialised");
+
+ return core.ConvertOutput(core.ProcessBlock(core.ConvertInput(inBuf, inOff, inLen)));
+ }
+ }
+}
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