Package org.bouncycastle.crypto.engines
Class RSAEngine
- java.lang.Object
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- org.bouncycastle.crypto.engines.RSAEngine
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- All Implemented Interfaces:
AsymmetricBlockCipher
public class RSAEngine extends java.lang.Object implements AsymmetricBlockCipher
this does your basic RSA algorithm.
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Constructor Summary
Constructors Constructor Description RSAEngine()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getInputBlockSize()
Return the maximum size for an input block to this engine.int
getOutputBlockSize()
Return the maximum size for an output block to this engine.void
init(boolean forEncryption, CipherParameters param)
initialise the RSA engine.byte[]
processBlock(byte[] in, int inOff, int inLen)
Process a single block using the basic RSA algorithm.
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Method Detail
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init
public void init(boolean forEncryption, CipherParameters param)
initialise the RSA engine.- Specified by:
init
in interfaceAsymmetricBlockCipher
- Parameters:
forEncryption
- true if we are encrypting, false otherwise.param
- the necessary RSA key parameters.
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getInputBlockSize
public int getInputBlockSize()
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.- Specified by:
getInputBlockSize
in interfaceAsymmetricBlockCipher
- Returns:
- maximum size for an input block.
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getOutputBlockSize
public int getOutputBlockSize()
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.- Specified by:
getOutputBlockSize
in interfaceAsymmetricBlockCipher
- Returns:
- maximum size for an output block.
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processBlock
public byte[] processBlock(byte[] in, int inOff, int inLen)
Process a single block using the basic RSA algorithm.- Specified by:
processBlock
in interfaceAsymmetricBlockCipher
- Parameters:
in
- the input array.inOff
- the offset into the input buffer where the data starts.inLen
- the length of the data to be processed.- Returns:
- the result of the RSA process.
- Throws:
DataLengthException
- the input block is too large.
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