com.alipay.mychain.sdk.crypto.cipher

类 SM4CbcPkeyCipherV1.PKCS5Padding

java.lang.Object

com.alipay.mychain.sdk.crypto.cipher.SM4CbcPkeyCipherV1.PKCS5Padding

封闭类:

SM4CbcPkeyCipherV1

public static class SM4CbcPkeyCipherV1.PKCS5Padding
extends Object

方法概要

限定符和类型	方法和说明
int	padLength(int len) Determines how long the padding will be for a given input length.
void	padWithLen(byte[] in, int off, int len) Adds the given number of padding bytes to the data input.
int	unpad(byte[] in, int off, int len) Returns the index where the padding starts.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

方法详细资料

padWithLen

public void padWithLen(byte[] in,
                       int off,
                       int len)
                throws ShortBufferException

Adds the given number of padding bytes to the data input. The value of the padding bytes is determined by the specific padding mechanism that implements this interface.

参数:

in - the input buffer with the data to pad

off - the offset in in where the padding bytes are appended

len - the number of padding bytes to add

抛出:

ShortBufferException - if in is too small to hold the padding bytes

unpad

public int unpad(byte[] in,
                 int off,
                 int len)

Returns the index where the padding starts.

Given a buffer with padded data, this method returns the index where the padding starts.

参数:

in - the buffer with the padded data

off - the offset in in where the padded data starts

len - the length of the padded data

返回:

the index where the padding starts, or -1 if the input is not properly padded

padLength

public int padLength(int len)

Determines how long the padding will be for a given input length.

参数:

len - the length of the data to pad

返回:

the length of the padding