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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.
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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.xml.security.utils;

public class EncryptionConstants {
    // Attributes that exist in XML Signature in the same way
    /** Tag of Attr Algorithm **/
    public static final String _ATT_ALGORITHM              = Constants._ATT_ALGORITHM;
    
    /** Tag of Attr Id**/
    public static final String _ATT_ID                     = Constants._ATT_ID;
    
    /** Tag of Attr Target **/
    public static final String _ATT_TARGET                 = Constants._ATT_TARGET;
    
    /** Tag of Attr Type **/
    public static final String _ATT_TYPE                   = Constants._ATT_TYPE;
    
    /** Tag of Attr URI **/
    public static final String _ATT_URI                    = Constants._ATT_URI;

    // Attributes new in XML Encryption
    /** Tag of Attr encoding **/
    public static final String _ATT_ENCODING               = "Encoding";
    
    /** Tag of Attr recipient **/
    public static final String _ATT_RECIPIENT              = "Recipient";
    
    /** Tag of Attr mimetype **/
    public static final String _ATT_MIMETYPE               = "MimeType";

    /** Tag of Element CarriedKeyName **/
    public static final String _TAG_CARRIEDKEYNAME         = "CarriedKeyName";
    
    /** Tag of Element CipherData **/
    public static final String _TAG_CIPHERDATA             = "CipherData";
    
    /** Tag of Element CipherReference **/
    public static final String _TAG_CIPHERREFERENCE        = "CipherReference";
    
    /** Tag of Element CipherValue **/
    public static final String _TAG_CIPHERVALUE            = "CipherValue";
    
    /** Tag of Element DataReference **/
    public static final String _TAG_DATAREFERENCE          = "DataReference";
    
    /** Tag of Element EncryptedData **/
    public static final String _TAG_ENCRYPTEDDATA          = "EncryptedData";
    
    /** Tag of Element EncryptedKey **/
    public static final String _TAG_ENCRYPTEDKEY           = "EncryptedKey";
    
    /** Tag of Element EncryptionMethod **/
    public static final String _TAG_ENCRYPTIONMETHOD       = "EncryptionMethod";
    
    /** Tag of Element EncryptionProperties **/
    public static final String _TAG_ENCRYPTIONPROPERTIES   = "EncryptionProperties";
    
    /** Tag of Element EncryptionProperty **/
    public static final String _TAG_ENCRYPTIONPROPERTY     = "EncryptionProperty";
    
    /** Tag of Element KeyReference **/
    public static final String _TAG_KEYREFERENCE           = "KeyReference";
    
    /** Tag of Element KeySize **/
    public static final String _TAG_KEYSIZE                = "KeySize";
    
    /** Tag of Element OAEPparams **/
    public static final String _TAG_OAEPPARAMS             = "OAEPparams";
    
    /** Tag of Element MGF **/
    public static final String _TAG_MGF                    = "MGF";
    
    /** Tag of Element ReferenceList **/
    public static final String _TAG_REFERENCELIST          = "ReferenceList";
    
    /** Tag of Element Transforms **/
    public static final String _TAG_TRANSFORMS             = "Transforms";
    
    /** Tag of Element AgreementMethod **/
    public static final String _TAG_AGREEMENTMETHOD        = "AgreementMethod";
    
    /** Tag of Element KA-Nonce **/
    public static final String _TAG_KA_NONCE               = "KA-Nonce";
    
    /** Tag of Element OriginatorKeyInfo **/
    public static final String _TAG_ORIGINATORKEYINFO      = "OriginatorKeyInfo";
    
    /** Tag of Element RecipientKeyInfo **/
    public static final String _TAG_RECIPIENTKEYINFO       = "RecipientKeyInfo";

    /** Field ENCRYPTIONSPECIFICATION_URL */
    public static final String ENCRYPTIONSPECIFICATION_URL = 
        "http://www.w3.org/TR/2001/WD-xmlenc-core-20010626/";

    /** The namespace of the 
     * 
     * XML Encryption Syntax and Processing */
    public static final String EncryptionSpecNS = 
        "http://www.w3.org/2001/04/xmlenc#";
    
    /**
     * The namespace of the XML Encryption 1.1 specification
     */
    public static final String EncryptionSpec11NS = 
        "http://www.w3.org/2009/xmlenc11#";

    /** URI for content*/
    public static final String TYPE_CONTENT                = EncryptionSpecNS + "Content";
    
    /** URI for element*/
    public static final String TYPE_ELEMENT                = EncryptionSpecNS + "Element";
    
    /** URI for mediatype*/
    public static final String TYPE_MEDIATYPE              = 
        "http://www.isi.edu/in-notes/iana/assignments/media-types/";

    /** Block Encryption - REQUIRED TRIPLEDES */
    public static final String ALGO_ID_BLOCKCIPHER_TRIPLEDES = 
        EncryptionConstants.EncryptionSpecNS + "tripledes-cbc";
    
    /** Block Encryption - REQUIRED AES-128 */
    public static final String ALGO_ID_BLOCKCIPHER_AES128 = 
        EncryptionConstants.EncryptionSpecNS + "aes128-cbc";
    
    /** Block Encryption - REQUIRED AES-256 */
    public static final String ALGO_ID_BLOCKCIPHER_AES256 = 
        EncryptionConstants.EncryptionSpecNS + "aes256-cbc";
    
    /** Block Encryption - OPTIONAL AES-192 */
    public static final String ALGO_ID_BLOCKCIPHER_AES192 = 
        EncryptionConstants.EncryptionSpecNS + "aes192-cbc";
    
    /** Block Encryption - OPTIONAL AES-128-GCM */
    public static final String ALGO_ID_BLOCKCIPHER_AES128_GCM = 
        "http://www.w3.org/2009/xmlenc11#aes128-gcm";
    
    /** Block Encryption - OPTIONAL AES-192-GCM */
    public static final String ALGO_ID_BLOCKCIPHER_AES192_GCM = 
        "http://www.w3.org/2009/xmlenc11#aes192-gcm";
    
    /** Block Encryption - OPTIONAL AES-256-GCM */
    public static final String ALGO_ID_BLOCKCIPHER_AES256_GCM = 
        "http://www.w3.org/2009/xmlenc11#aes256-gcm";

    /** Key Transport - REQUIRED RSA-v1.5*/
    public static final String ALGO_ID_KEYTRANSPORT_RSA15 = 
        EncryptionConstants.EncryptionSpecNS + "rsa-1_5";
    
    /** Key Transport - REQUIRED RSA-OAEP */
    public static final String ALGO_ID_KEYTRANSPORT_RSAOAEP = 
        EncryptionConstants.EncryptionSpecNS + "rsa-oaep-mgf1p";
    
    /** Key Transport - OPTIONAL RSA-OAEP_11 */
    public static final String ALGO_ID_KEYTRANSPORT_RSAOAEP_11 = 
        EncryptionConstants.EncryptionSpec11NS + "rsa-oaep";

    /** Key Agreement - OPTIONAL Diffie-Hellman */
    public static final String ALGO_ID_KEYAGREEMENT_DH = 
        EncryptionConstants.EncryptionSpecNS + "dh";

    /** Symmetric Key Wrap - REQUIRED TRIPLEDES KeyWrap */
    public static final String ALGO_ID_KEYWRAP_TRIPLEDES = 
        EncryptionConstants.EncryptionSpecNS + "kw-tripledes";
    
    /** Symmetric Key Wrap - REQUIRED AES-128 KeyWrap */
    public static final String ALGO_ID_KEYWRAP_AES128 = 
        EncryptionConstants.EncryptionSpecNS + "kw-aes128";
    
    /** Symmetric Key Wrap - REQUIRED AES-256 KeyWrap */
    public static final String ALGO_ID_KEYWRAP_AES256 = 
        EncryptionConstants.EncryptionSpecNS + "kw-aes256";
    
    /** Symmetric Key Wrap - OPTIONAL AES-192 KeyWrap */
    public static final String ALGO_ID_KEYWRAP_AES192 = 
        EncryptionConstants.EncryptionSpecNS + "kw-aes192";

    /** Message Authentication - RECOMMENDED XML Digital Signature */
    public static final String ALGO_ID_AUTHENTICATION_XMLSIGNATURE = 
        "http://www.w3.org/TR/2001/CR-xmldsig-core-20010419/";

    /** Canonicalization - OPTIONAL Canonical XML with Comments */
    public static final String ALGO_ID_C14N_WITHCOMMENTS = 
        "http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments";
    
    /** Canonicalization - OPTIONAL Canonical XML (omits comments) */
    public static final String ALGO_ID_C14N_OMITCOMMENTS = 
        "http://www.w3.org/TR/2001/REC-xml-c14n-20010315";

    /** Encoding - REQUIRED base64 */
    public static final String ALGO_ID_ENCODING_BASE64 = 
        "http://www.w3.org/2000/09/xmldsig#base64";
    
    /** MGF1 with SHA-1 */
    public static final String MGF1_SHA1 =
        EncryptionConstants.EncryptionSpec11NS + "mgf1sha1";
    
    /** MGF1 with SHA-224 */
    public static final String MGF1_SHA224 =
        EncryptionConstants.EncryptionSpec11NS + "mgf1sha224";
    
    /** MGF1 with SHA-256 */
    public static final String MGF1_SHA256 =
        EncryptionConstants.EncryptionSpec11NS + "mgf1sha256";
    
    /** MGF1 with SHA-384 */
    public static final String MGF1_SHA384 =
        EncryptionConstants.EncryptionSpec11NS + "mgf1sha384";
    
    /** MGF1 with SHA-512 */
    public static final String MGF1_SHA512 =
        EncryptionConstants.EncryptionSpec11NS + "mgf1sha512";


    private EncryptionConstants() {
        // we don't allow instantiation
    }

}