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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.crypto;

/**
 * Interface for a converter that produces a byte encoding for a char array.
 */
public interface CharToByteConverter
{
    /**
     * Return the type of the conversion.
     *
     * @return a type name for the conversion.
     */
    String getType();

    /**
     * Return a byte encoded representation of the passed in password.
     *
     * @param password the characters to encode.
     * @return a byte encoding of password.
     */
    byte[] convert(char[] password);
}