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JDK 1.1 Source Code Directory
JDK 1.1 source code directory contains Java source code for JDK 1.1 core classes:
"C:\fyicenter\jdk-1.1.8\src".
Here is the list of Java classes of the JDK 1.1 source code:
✍: FYIcenter
⏎ java/security/Signature.java
/* * @(#)Signature.java 1.50 01/12/10 * * Copyright 2002 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.security; import java.util.*; import java.io.*; /** * This Signature class is used to provide the functionality of a * digital signature algorithm, such as <tt>RSA with MD5</tt> or * <tt>DSA</tt>. Digital signatures are used for authentication and * integrity assurance of digital data. * * </dl> * * <p>Like other algorithm-based classes in Java Security, the * Signature class has two major components: * * <dl> * * <dt><b>Digital Signature API</b> (Application Program Interface) * * <dd>This is the interface of methods called by applications needing * digital signature services. The API consists of all public methods. * * <dt><b>Digital Signature SPI</b> (Service Provider Interface) * * <dd>This is the interface implemented by providers that supply * specific algorithms. It consists of all methods whose names are * prefixed by <code>engine</code>. Each such method is called by a * correspondingly-named public API method. For example, the * <code>engineSign</code> method is called by the * <code>sign</code> method. The SPI methods are abstract; * providers must supply a concrete implementation. * * </dl> * * <p>Also like other algorithm-based classes in Java Security, Signature * provides implementation-independent algorithms, whereby a caller * (application code) requests a particular signature algorithm * and is handed back a properly initialized Signature object. It is * also possible, if desired, to request a particular algorithm from a * particular provider. See the <code>getInstance </code> methods. * * <p>Thus, there are two ways to request a Signature algorithm object: by * specifying either just an algorithm name, or both an algorithm name * and a package provider. <ul> * * <li>If just an algorithm name is specified, the system will * determine if there is an implementation of the algorithm requested * available in the environment, and if there is more than one, if * there is a preferred one. * * <li>If both an algorithm name and a package provider are specified, * the system will determine if there is an implementation of the * algorithm in the package requested, and throw an exception if there * is not. * * </ul> * <p>A Signature object can be used to generate and verify digital * signatures. * * <p>There are three phases to the use of a Signature object for * either signing data or verifying a signature:<ol> * * <li>Initialization, with either * * <ul> * * <li>a public key, which initializes the signature for * verification (see <a href = "#initVerify">initVerify</a>), or * * <li>a private key, which initializes the signature for * signing (see <a href = "#initSign">initSign</a>). * * </ul><p> * * <li>Updating<p> * * <p>Depending on the type of initialization, this will update the * bytes to be signed or verified. See the <a href = * "#update(byte)">update</a> methods.<p> * * <li>Signing or Verifying * * <p>a signature on all updated bytes. See <a * href = "#sign">sign</a> and <a href = "#verify">verify</a>. * * </ol> * * @version 1.44 97/02/03 * @author Benjamin Renaud */ public abstract class Signature { /* Are we in debugging mode? */ private static boolean debug = false; /* The algorithm for this signature object. */ private String algorithm; /** * Possible <a href = "#state ">state </a> value, signifying that * this signature object has not yet been initialized. */ protected final static int UNINITIALIZED = 0; /** * Possible <a href = "#state ">state </a> value, signifying that * this signature object has been initialized for signing. */ protected final static int SIGN = 2; /** * Possible <a href = "#state ">state </a> value, signifying that * this signature object has been initialized for verification. */ protected final static int VERIFY = 3; /** * Current state of this signature object. */ protected int state = UNINITIALIZED; /** * Creates a Signature object for the specified algorithm. * * @param algorithm the standard string name of the algorithm. * See Appendix A in the <a href= * "../guide/security/CryptoSpec.html#AppA"> * Java Cryptography Architecture API Specification & Reference </a> * for information about standard algorithm names. */ protected Signature(String algorithm) { this.algorithm = algorithm; } /** * Generates a Signature object that implements the specified * algorithm. If the default provider package contains a Signature * subclass implementing the algorithm, an instance of that subclass * is returned. If the algorithm is not available in the default * package, other packages are searched. * * @param algorithm the standard name of the algorithm requested. * See Appendix A in the <a href= * "../guide/security/CryptoSpec.html#AppA"> * Java Cryptography Architecture API Specification & Reference </a> * for information about standard algorithm names. * * @return the new Signature object. * * @exception NoSuchAlgorithmException if the algorithm is * not available in the environment. */ public static Signature getInstance(String algorithm) throws NoSuchAlgorithmException { try { return (Signature)Security.getImpl(algorithm, "Signature", null); } catch(NoSuchProviderException e) { throw new InternalError("please send a bug report via " + System.getProperty("java.vendor.url.bug")); } } /** * Generates a Signature object implementing the specified * algorithm, as supplied from the specified provider, if such an * algorithm is available from the provider. * * @param algorithm the name of the algorithm requested. * See Appendix A in the <a href= * "../guide/security/CryptoSpec.html#AppA"> * Java Cryptography Architecture API Specification & Reference </a> * for information about standard algorithm names. * * @param provider the name of the provider. * * @return the new Signature object. * * @exception NoSuchAlgorithmException if the algorithm is * not available in the package supplied by the requested * provider. * * @exception NoSuchProviderException if the provider is not * available in the environment. * * @see Provider */ public static Signature getInstance(String algorithm, String provider) throws NoSuchAlgorithmException, NoSuchProviderException { return (Signature)Security.getImpl(algorithm, "Signature", provider); } /** * Initializes this object for verification. If this method is called * again with a different argument, it negates the effect * of this call. * * @param publicKey the public key of the identity whose signature is * going to be verified. * * @exception InvalidKeyException if the key is invalid. */ public final void initVerify(PublicKey publicKey) throws InvalidKeyException { engineInitVerify(publicKey); state = VERIFY; } /** * Initialize this object for signing. If this method is called * again with a different argument, it negates the effect * of this call. * * @param privateKey the private key of the identity whose signature * is going to be generated. * * @exception InvalidKeyException if the key is invalid. */ public final void initSign(PrivateKey privateKey) throws InvalidKeyException { engineInitSign(privateKey); state = SIGN; } /** * Returns the signature bytes of all the data updated. The * signature returned is X.509-encoded. * * <p>A call to this method resets this signature object to the state * it was in when previously initialized for signing via a * call to <code>initSign(PrivateKey)</code>. That is, the object is * reset and available to generate another signature from the same * signer, if desired, via new calls to <code>update</code> and * <code>sign</code>. * * @return the signature bytes of the signing operation's result. * * @exception SignatureException if this signature object is not * initialized properly. */ public final byte[] sign() throws SignatureException { if (state == SIGN) { return engineSign(); } throw new SignatureException("object not initialized for " + "signing."); } /** * Verifies the passed-in signature. The signature bytes are expected * to be X.509-encoded. * * <p>A call to this method resets this signature object to the state * it was in when previously initialized for verification via a * call to <code>initVerify(PublicKey)</code>. That is, the object is * reset and available to verify another signature from the identity * whose public key was specified in the call to <code>initVerify</code>. * * @param signature the signature bytes to be verified. * * @return true if the signature was verified, false if not. * * @exception SignatureException if this signature object is not * initialized properly, or the passed-in signature is improperly * encoded or of the wrong type, etc. */ public final boolean verify(byte[] signature) throws SignatureException { if (state == VERIFY) { return engineVerify(signature); } throw new SignatureException("object not initialized for " + "verification."); } /** * Updates the data to be signed or verified by a byte. * * @param b the byte to use for the update. * * @exception SignatureException if this signature object is not * initialized properly. */ public final void update(byte b) throws SignatureException { if (state == VERIFY || state == SIGN) { engineUpdate(b); } else { throw new SignatureException("object not initialized for signature " + "or verification."); } } /** * Updates the data to be signed or verified, using the specified * array of bytes. * * @param data the byte array to use for the update. * * @exception SignatureException if this signature object is not * initialized properly. */ public final void update(byte[] data) throws SignatureException { update(data, 0, data.length); } /** * Updates the data to be signed or verified, using the specified * array of bytes, starting at the specified offset. * * @param data the array of bytes. * @param off the offset to start from in the array of bytes. * @param len the number of bytes to use, starting at offset. * * @exception SignatureException if this signature object is not * initialized properly. */ public final void update(byte[] data, int off, int len) throws SignatureException { if (state == SIGN || state == VERIFY) { engineUpdate(data, off, len); } else { throw new SignatureException("object not initialized for signature " + "or verification."); } } /** * Returns the name of the algorithm for this signature object. * * @return the name of the algorithm for this signature object. */ public final String getAlgorithm() { return algorithm; } /** * Returns a string representation of this signature object, * providing information that includes the state of the object * and the name of the algorithm used. * * @return a string representation of this signature object. */ public String toString() { String initState = ""; switch (state) { case UNINITIALIZED: initState = "<not initialized>"; break; case VERIFY: initState = "<initialized for verifying>"; break; case SIGN: initState = "<initialized for signing>"; break; } return "Signature object: " + getAlgorithm() + initState; } /** * Sets the specified algorithm parameter to the specified value. * This method supplies a general-purpose mechanism through * which it is possible to set the various parameters of this object. * A parameter may be any settable parameter for the algorithm, such as * a parameter size, or a source of random bits for signature generation * (if appropriate), or an indication of whether or not to perform * a specific but optional computation. A uniform algorithm-specific * naming scheme for each parameter is desirable but left unspecified * at this time. * * @param param the string identifier of the parameter. * @param value the parameter value. * * @exception InvalidParameterException if <code>param</code> is an * invalid parameter for this signature algorithm engine, * the parameter is already set * and cannot be set again, a security exception occurs, and so on. */ public final void setParameter(String param, Object value) throws InvalidParameterException { engineSetParameter(param, value); } /** * Gets the value of the specified algorithm parameter. This method * supplies a general-purpose mechanism through which it is possible to * get the various parameters of this object. A parameter may be any * settable parameter for the algorithm, such as a parameter size, or * a source of random bits for signature generation (if appropriate), * or an indication of whether or not to perform a specific but optional * computation. A uniform algorithm-specific naming scheme for each * parameter is desirable but left unspecified at this time. * * @param param the string name of the parameter. * * @return the object that represents the parameter value, or null if * there is none. * * @exception InvalidParameterException if <code>param</code> is an invalid * parameter for this engine, or another exception occurs while * trying to get this parameter. */ public final Object getParameter(String param) throws InvalidParameterException { return engineGetParameter(param); } /** * <b>SPI</b>: Initializes this signature object with the specified * public key for verification operations. * * @param publicKey the public key of the identity whose signature is * going to be verified. * * @exception InvalidKeyException if the key is improperly * encoded, parameters are missing, and so on. */ protected abstract void engineInitVerify(PublicKey publicKey) throws InvalidKeyException; /** * <b>SPI</b>: Initializes this signature object with the specified * private key for signing operations. * * @param privateKey the private key of the identity whose signature * will be generated. * * @exception InvalidKeyException if the key is improperly * encoded, parameters are missing, and so on. */ protected abstract void engineInitSign(PrivateKey privateKey) throws InvalidKeyException; /** * <b>SPI</b>: Updates the data to be signed or verified * using the specified byte. * * @param b the byte to use for the update. * * @exception SignatureException if the engine is not initialized * properly. */ protected abstract void engineUpdate(byte b) throws SignatureException; /** * <b>SPI</b>: Updates the data to be signed or verified, using the * specified array of bytes, starting at the specified offset. * * @param data the array of bytes. * @param off the offset to start from in the array of bytes. * @param len the number of bytes to use, starting at offset. * * @exception SignatureException if the engine is not initialized * properly. */ protected abstract void engineUpdate(byte[] b, int off, int len) throws SignatureException; /** * <b>SPI</b>: Returns the signature bytes of all the data * updated so far. The signature returned is X.509-encoded. * For more information about the X.509 encoding, see * <a href = "../guide/security/cert2.html">X.509 certificates</a>. * * @return the signature bytes of the signing operation's result. * * @exception SignatureException if the engine is not * initialized properly. */ protected abstract byte[] engineSign() throws SignatureException; /** * <b>SPI</b>: Verifies the passed-in signature. The signature bytes * are expected to be X.509-encoded. For more information about the * X.509 encoding, see <a href = "../guide/security/cert2.html">X.509 * certificates</a>. * * @param sigBytes the signature bytes to be verified. * * @return true if the signature was verified, false if not. * * @exception SignatureException if the engine is not initialized * properly, or the passed-in signature is improperly encoded or * of the wrong type, etc. */ protected abstract boolean engineVerify(byte[] sigBytes) throws SignatureException; /** * <b>SPI</b>: Sets the specified algorithm parameter to the specified * value. This method supplies a general-purpose mechanism through * which it is possible to set the various parameters of this object. * A parameter may be any settable parameter for the algorithm, such as * a parameter size, or a source of random bits for signature generation * (if appropriate), or an indication of whether or not to perform * a specific but optional computation. A uniform algorithm-specific * naming scheme for each parameter is desirable but left unspecified * at this time. * * @param param the string identifier of the parameter. * * @param value the parameter value. * * @exception InvalidParameterException if <code>param</code> is an * invalid parameter for this signature algorithm engine, * the parameter is already set * and cannot be set again, a security exception occurs, and so on. */ protected abstract void engineSetParameter(String param, Object value) throws InvalidParameterException; /** * <b>SPI</b>: Gets the value of the specified algorithm parameter. * This method supplies a general-purpose mechanism through which it * is possible to get the various parameters of this object. A parameter * may be any settable parameter for the algorithm, such as a parameter * size, or a source of random bits for signature generation (if * appropriate), or an indication of whether or not to perform a * specific but optional computation. A uniform algorithm-specific * naming scheme for each parameter is desirable but left unspecified * at this time. * * @param param the string name of the parameter. * * @return the object that represents the parameter value, or null if * there is none. * * @exception InvalidParameterException if <code>param</code> is an * invalid parameter for this engine, or another exception occurs while * trying to get this parameter. */ protected abstract Object engineGetParameter(String param) throws InvalidParameterException; /** * Returns a clone if the implementation is cloneable. * * @return a clone if the implementation is cloneable. * * @exception CloneNotSupportedException if this is called * on an implementation that does not support <code>Cloneable</code>. */ public Object clone() throws CloneNotSupportedException { if (this instanceof Cloneable) { return super.clone(); } else { throw new CloneNotSupportedException(); } } // private debugging method. private static void debug(String statement) { if (debug) { System.err.println(statement); } } // private debugging method. private static void debug(Exception e) { if (debug) { e.printStackTrace(); } } }
⏎ java/security/Signature.java
⇒ Backup JDK 1.1 Installation Directory
2018-11-17, 38002👍, 0💬
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