Class OAEPEncoding
java.lang.Object
org.gudy.bouncycastle.crypto.encodings.OAEPEncoding
- All Implemented Interfaces:
AsymmetricBlockCipher
Optimal Asymmetric Encryption Padding (OAEP) - see PKCS 1 V 2.
-
Field Summary
FieldsModifier and TypeFieldDescriptionprivate byte[]
private AsymmetricBlockCipher
private boolean
private Digest
private SecureRandom
-
Constructor Summary
ConstructorsConstructorDescriptionOAEPEncoding
(AsymmetricBlockCipher cipher) OAEPEncoding
(AsymmetricBlockCipher cipher, Digest hash) OAEPEncoding
(AsymmetricBlockCipher cipher, Digest hash, byte[] encodingParams) -
Method Summary
Modifier and TypeMethodDescriptionbyte[]
decodeBlock
(byte[] in, int inOff, int inLen) byte[]
encodeBlock
(byte[] in, int inOff, int inLen) int
returns the largest size an input block can be.int
returns the maximum size of the block produced by this cipher.void
init
(boolean forEncryption, CipherParameters param) initialise the cipher.private void
ItoOSP
(int i, byte[] sp) int to octet string.private byte[]
maskGeneratorFunction1
(byte[] Z, int zOff, int zLen, int length) mask generator function, as described in PKCS1v2.byte[]
processBlock
(byte[] in, int inOff, int inLen) process the block of len bytes stored in in from offset inOff.
-
Field Details
-
defHash
private byte[] defHash -
hash
-
engine
-
random
-
forEncryption
private boolean forEncryption
-
-
Constructor Details
-
OAEPEncoding
-
OAEPEncoding
-
OAEPEncoding
-
-
Method Details
-
getUnderlyingCipher
-
init
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.
-
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.
-
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.
-
processBlock
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.
-
encodeBlock
- Throws:
InvalidCipherTextException
-
decodeBlock
- Throws:
InvalidCipherTextException
- if the decryypted block turns out to be badly formatted.
-
ItoOSP
private void ItoOSP(int i, byte[] sp) int to octet string. -
maskGeneratorFunction1
private byte[] maskGeneratorFunction1(byte[] Z, int zOff, int zLen, int length) mask generator function, as described in PKCS1v2.
-