File	Doc	Category	Size	Date	Package
SignedObject.java	API Doc	Android 1.5 API	5747	Wed May 06 22:41:06 BST 2009	java.security

SignedObject

• java.lang.Object

Fields Summary
private static final long	serialVersionUID
private byte[]	content
private byte[]	signature
private String	thealgorithm

Constructors Summary

public SignedObject(Serializable object, PrivateKey signingKey, Signature signingEngine) Constructs a new instance of {@code SignedObject} with the target object, the private key and the engine to compute the signature. The given {@code object} is signed with the specified key and engine. param object the object to bes signed. param signingKey the private key, used to sign the {@code object}. param signingEngine the engine that performs the signature generation. throws IOException if a serialization error occurs. throws InvalidKeyException if the private key is not valid. throws SignatureException if signature generation failed. since Android 1.0 ByteArrayOutputStream baos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(baos); try { // Serialize oos.writeObject(object); oos.flush(); } finally { oos.close(); } content = baos.toByteArray(); signingEngine.initSign(signingKey); thealgorithm = signingEngine.getAlgorithm(); signingEngine.update(content); signature = signingEngine.sign();

Methods Summary
public java.lang.String	getAlgorithm() Returns the name of the algorithm of this {@code SignedObject}. return the name of the algorithm of this {@code SignedObject}. since Android 1.0 return thealgorithm;
public java.lang.Object	getObject() Returns the encapsulated object. Each time this method is invoked, the encapsulated object is deserialized before it is returned. return the encapsulated object. throws IOException if deserialization failed. throws ClassNotFoundException if the class of the encapsulated object can not be found. since Android 1.0 // deserialize our object ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream( content)); try { return ois.readObject(); } finally { ois.close(); }
public byte[]	getSignature() Returns the signature data of the encapsulated serialized object. return the signature data of the encapsulated serialized object. since Android 1.0 byte[] sig = new byte[signature.length]; System.arraycopy(signature, 0, sig, 0, signature.length); return sig;
private void	readObject(java.io.ObjectInputStream s) s.defaultReadObject(); byte[] tmp = new byte[content.length]; System.arraycopy(content, 0, tmp, 0, content.length); content = tmp; tmp = new byte[signature.length]; System.arraycopy(signature, 0, tmp, 0, signature.length); signature = tmp;
public boolean	verify(java.security.PublicKey verificationKey, java.security.Signature verificationEngine) Indicates whether the contained signature for the encapsulated object is valid. param verificationKey the public key to verify the signature. param verificationEngine the signature engine. return {@code true} if the contained signature for the encapsulated object is valid, {@code false} otherwise. throws InvalidKeyException if the public key is invalid. throws SignatureException if signature verification failed. since Android 1.0 verificationEngine.initVerify(verificationKey); verificationEngine.update(content); return verificationEngine.verify(signature);