gnu.crypto.pad
Class PKCS1_V1_5
- IPad
A padding algorithm implementation of the EME-PKCS1-V1.5 encoding/decoding
algorithm as described in section 7.2 of RFC-3447. This is effectively an
Adapter over an instance of
EME_PKCS1_V1_5
initialised with
the RSA public shared modulus length (in bytes).
References:
- Public-Key Cryptography
Standards (PKCS) #1:
RSA Cryptography Specifications Version 2.1.
Jakob Jonsson and Burt Kaliski.
PKCS1_V1_5() - 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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boolean | selfTest() - A basic symmetric pad/unpad test.
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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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PKCS1_V1_5
(package private) PKCS1_V1_5()
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.
selfTest
public boolean selfTest()
A basic symmetric pad/unpad test.
- selfTest in interface IPad
- selfTest in interface BasePad
- true if the implementation passes a basic symmetric
self-test. Returns false otherwise.
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.