Class PKCS1Encoding
- java.lang.Object
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- org.gudy.bouncycastle.crypto.encodings.PKCS1Encoding
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- All Implemented Interfaces:
AsymmetricBlockCipher
public class PKCS1Encoding extends java.lang.Object implements AsymmetricBlockCipher
this does your basic PKCS 1 v1.5 padding - whether or not you should be using this depends on your application - see PKCS1 Version 2 for details.
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Field Summary
Fields Modifier and Type Field Description private AsymmetricBlockCipher
engine
private boolean
forEncryption
private boolean
forPrivateKey
private static int
HEADER_LENGTH
private java.security.SecureRandom
random
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Constructor Summary
Constructors Constructor Description PKCS1Encoding(AsymmetricBlockCipher cipher)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description private byte[]
decodeBlock(byte[] in, int inOff, int inLen)
private byte[]
encodeBlock(byte[] in, int inOff, int inLen)
int
getInputBlockSize()
returns the largest size an input block can be.int
getOutputBlockSize()
returns the maximum size of the block produced by this cipher.AsymmetricBlockCipher
getUnderlyingCipher()
void
init(boolean forEncryption, CipherParameters param)
initialise the cipher.byte[]
processBlock(byte[] in, int inOff, int inLen)
process the block of len bytes stored in in from offset inOff.
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Field Detail
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HEADER_LENGTH
private static int HEADER_LENGTH
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random
private java.security.SecureRandom random
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engine
private AsymmetricBlockCipher engine
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forEncryption
private boolean forEncryption
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forPrivateKey
private boolean forPrivateKey
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Constructor Detail
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PKCS1Encoding
public PKCS1Encoding(AsymmetricBlockCipher cipher)
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Method Detail
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getUnderlyingCipher
public AsymmetricBlockCipher getUnderlyingCipher()
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init
public void init(boolean forEncryption, CipherParameters param)
Description copied from interface:AsymmetricBlockCipher
initialise the cipher.- Specified by:
init
in interfaceAsymmetricBlockCipher
- Parameters:
forEncryption
- if true the cipher is initialised for encryption, if false for decryption.param
- the key and other data required by the cipher.
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getInputBlockSize
public int getInputBlockSize()
Description copied from interface:AsymmetricBlockCipher
returns the largest size an input block can be.- Specified by:
getInputBlockSize
in interfaceAsymmetricBlockCipher
- Returns:
- maximum size for an input block.
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getOutputBlockSize
public int getOutputBlockSize()
Description copied from interface:AsymmetricBlockCipher
returns the maximum size of the block produced by this cipher.- Specified by:
getOutputBlockSize
in interfaceAsymmetricBlockCipher
- Returns:
- maximum size of the output block produced by the cipher.
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processBlock
public byte[] processBlock(byte[] in, int inOff, int inLen) throws InvalidCipherTextException
Description copied from interface:AsymmetricBlockCipher
process the block of len bytes stored in in from offset inOff.- Specified by:
processBlock
in interfaceAsymmetricBlockCipher
- Parameters:
in
- the input datainOff
- offset into the in array where the data startsinLen
- the length of the block to be processed.- Returns:
- the resulting byte array of the encryption/decryption process.
- Throws:
InvalidCipherTextException
- data decrypts improperly.
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encodeBlock
private byte[] encodeBlock(byte[] in, int inOff, int inLen) throws InvalidCipherTextException
- Throws:
InvalidCipherTextException
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decodeBlock
private byte[] decodeBlock(byte[] in, int inOff, int inLen) throws InvalidCipherTextException
- Throws:
InvalidCipherTextException
- if the decrypted block is not in PKCS1 format.
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