package org.bouncycastle.shaded.crypto.paddings;
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import java.security.SecureRandom;
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import org.bouncycastle.shaded.crypto.InvalidCipherTextException;
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/**
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* Block cipher padders are expected to conform to this interface
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*/
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public interface BlockCipherPadding
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{
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/**
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* Initialise the padder.
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*
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* @param random the source of randomness for the padding, if required.
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*/
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public void init(SecureRandom random)
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throws IllegalArgumentException;
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/**
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* Return the name of the algorithm the cipher implements.
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*
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* @return the name of the algorithm the cipher implements.
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*/
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public String getPaddingName();
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/**
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* add the pad bytes to the passed in block, returning the
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* number of bytes added.
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* <p>
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* Note: this assumes that the last block of plain text is always
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* passed to it inside in. i.e. if inOff is zero, indicating the
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* entire block is to be overwritten with padding the value of in
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* should be the same as the last block of plain text. The reason
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* for this is that some modes such as "trailing bit compliment"
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* base the padding on the last byte of plain text.
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* </p>
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*/
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public int addPadding(byte[] in, int inOff);
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/**
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* return the number of pad bytes present in the block.
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* @exception InvalidCipherTextException if the padding is badly formed
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* or invalid.
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*/
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public int padCount(byte[] in)
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throws InvalidCipherTextException;
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}
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