gnu.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.
PKCS7() - Trivial package-private constructor for use by the Factory class.
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byte[] | pad(byte[] in, int offset, int length) - Returns the byte sequence that should be appended to the designated input.
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void | setup()
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int | unpad(byte[] in, int offset, int length) - Returns the number of bytes to discard from a designated input buffer.
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PKCS7
(package private) PKCS7()
Trivial package-private constructor for use by the
Factory class.
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.
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.
Copyright © 2001, 2002, 2003
Free Software Foundation,
Inc. All Rights Reserved.