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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.operator;

/**
 * Interface for ContentVerifiers that also support raw signatures that can be
 * verified using the digest of the calculated data.
 */
public interface RawContentVerifier
{
    /**
     * Verify that the expected signature value was derived from the passed in digest.
     *
     * @param digest digest calculated from the content.
     * @param expected expected value of the signature
     * @return true if the expected signature is derived from the digest, false otherwise.
     */
    boolean verify(byte[] digest, byte[] expected);
}