package org.bouncycastle.shaded.crypto;
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/**
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* Ciphers producing a key stream which can be reset to particular points in the stream implement this.
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*/
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public interface SkippingCipher
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{
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/**
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* Skip numberOfBytes forwards, or backwards.
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*
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* @param numberOfBytes the number of bytes to skip (positive forward, negative backwards).
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* @return the number of bytes actually skipped.
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* @throws java.lang.IllegalArgumentException if numberOfBytes is an invalid value.
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*/
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long skip(long numberOfBytes);
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/**
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* Reset the cipher and then skip forward to a given position.
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*
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* @param position the number of bytes in to set the cipher state to.
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* @return the byte position moved to.
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*/
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long seekTo(long position);
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/**
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* Return the current "position" of the cipher
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*
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* @return the current byte position.
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*/
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long getPosition();
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}
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