gnu.javax.crypto.pad
Class PKCS7
- IPad
The implementation of the PKCS7 padding algorithm.
This algorithm is described for 8-byte blocks in [RFC-1423] and extended to
block sizes of up to 256 bytes in [PKCS-7].
References:
- RFC-1423: Privacy
Enhancement for Internet Electronic Mail: Part III: Algorithms, Modes, and
Identifiers.
- IETF.
- [PKCS-7]
PKCS #7: Cryptographic Message Syntax Standard - An RSA Laboratories
Technical Note.
- RSA Security.
byte[] | pad(byte[] in, int offset, int length)- Returns the byte sequence that should be appended to the designated input.
|
void | setup()- If any additional checks or resource setup must be done by the subclass,
then this is the hook for it.
|
int | unpad(byte[] in, int offset, int length)- Returns the number of bytes to discard from a designated input buffer.
|
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
pad
public byte[] pad(byte[] in,
int offset,
int length) Returns the byte sequence that should be appended to the designated input.
- pad in interface IPad
- pad in interface BasePad
in - the input buffer containing the bytes to pad.offset - the starting index of meaningful data in in.length - the number of meaningful bytes in in.
- the possibly 0-byte long sequence to be appended to the designated
input.
setup
public void setup()
If any additional checks or resource setup must be done by the subclass,
then this is the hook for it. This method will be called before the
BasePad.init(int) method returns.
- setup in interface BasePad
unpad
public int unpad(byte[] in,
int offset,
int length)
throws WrongPaddingException Returns the number of bytes to discard from a designated input buffer.
- unpad in interface IPad
- unpad in interface BasePad
in - the input buffer containing the bytes to unpad.offset - the starting index of meaningful data in in.length - the number of meaningful bytes in in.
- the number of bytes to discard, to the left of index position
offset + length in in. In other words, if
the return value of a successful invocation of this method is
result, then the unpadded byte sequence will be
offset + length - result bytes in in,
starting from index position offset.
PKCS7.java --
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