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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android.
Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add
an alternative (updated/complete) Bouncy Castle jar.
This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.
package org.spongycastle.operator;
import java.io.InputStream;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
/**
* General interface for an operator that is able to produce
* an InputStream that will decrypt a stream of encrypted data.
*/
public interface InputDecryptor
{
/**
* Return the algorithm identifier describing the encryption
* algorithm and parameters this decryptor can process.
*
* @return algorithm oid and parameters.
*/
AlgorithmIdentifier getAlgorithmIdentifier();
/**
* Wrap the passed in input stream encIn, returning an input stream
* that decrypts what it reads from encIn before returning it.
*
* @param encIn InputStream containing encrypted input.
* @return an decrypting InputStream
*/
InputStream getInputStream(InputStream encIn);
}