diff options
Diffstat (limited to 'crypto/src/crypto/engines/RSACoreEngine.cs')
| -rw-r--r-- | crypto/src/crypto/engines/RSACoreEngine.cs | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/crypto/src/crypto/engines/RSACoreEngine.cs b/crypto/src/crypto/engines/RSACoreEngine.cs index fd44e3cc1..5f6e98eea 100644 --- a/crypto/src/crypto/engines/RSACoreEngine.cs +++ b/crypto/src/crypto/engines/RSACoreEngine.cs @@ -9,13 +9,20 @@ namespace Org.BouncyCastle.Crypto.Engines /** * this does your basic RSA algorithm. */ - class RsaCoreEngine + public class RsaCoreEngine + : IRsa { private RsaKeyParameters key; private bool forEncryption; private int bitSize; - /** + private void CheckInitialised() + { + if (key == null) + throw new InvalidOperationException("RSA engine not initialised"); + } + + /** * initialise the RSA engine. * * @param forEncryption true if we are encrypting, false otherwise. @@ -47,6 +54,8 @@ namespace Org.BouncyCastle.Crypto.Engines */ public virtual int GetInputBlockSize() { + CheckInitialised(); + if (forEncryption) { return (bitSize - 1) / 8; @@ -64,7 +73,9 @@ namespace Org.BouncyCastle.Crypto.Engines */ public virtual int GetOutputBlockSize() { - if (forEncryption) + CheckInitialised(); + + if (forEncryption) { return (bitSize + 7) / 8; } @@ -77,7 +88,9 @@ namespace Org.BouncyCastle.Crypto.Engines int inOff, int inLen) { - int maxLength = (bitSize + 7) / 8; + CheckInitialised(); + + int maxLength = (bitSize + 7) / 8; if (inLen > maxLength) throw new DataLengthException("input too large for RSA cipher."); @@ -93,7 +106,9 @@ namespace Org.BouncyCastle.Crypto.Engines public virtual byte[] ConvertOutput( BigInteger result) { - byte[] output = result.ToByteArrayUnsigned(); + CheckInitialised(); + + byte[] output = result.ToByteArrayUnsigned(); if (forEncryption) { @@ -115,7 +130,9 @@ namespace Org.BouncyCastle.Crypto.Engines public virtual BigInteger ProcessBlock( BigInteger input) { - if (key is RsaPrivateCrtKeyParameters) + CheckInitialised(); + + if (key is RsaPrivateCrtKeyParameters) { // // we have the extra factors, use the Chinese Remainder Theorem - the author |