Source Code Cross Referenced for CipherProvider.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » iapi » services » crypto » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.iapi.services.crypto 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:
03:           Derby - Class org.apache.derby.iapi.services.crypto.CipherProvider
04:
05:           Licensed to the Apache Software Foundation (ASF) under one or more
06:           contributor license agreements.  See the NOTICE file distributed with
07:           this work for additional information regarding copyright ownership.
08:           The ASF licenses this file to you under the Apache License, Version 2.0
09:           (the "License"); you may not use this file except in compliance with
10:           the License.  You may obtain a copy of the License at
11:
12:              http://www.apache.org/licenses/LICENSE-2.0
13:
14:           Unless required by applicable law or agreed to in writing, software
15:           distributed under the License is distributed on an "AS IS" BASIS,
16:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17:           See the License for the specific language governing permissions and
18:           limitations under the License.
19:
20:         */
21:
22:        package org.apache.derby.iapi.services.crypto;
23:
24:        import java.security.Key;
25:
26:        import org.apache.derby.iapi.error.StandardException;
27:
28:        /**
29:         A CipherProvider is a wrapper for a Cipher class in JCE.
30:
31:         This service is only available when run on JDK1.2 or beyond.
32:         To use this service, either the SunJCE or an alternative clean room
33:         implementation of the JCE must be installed.
34:
35:         To use a CipherProvider to encrypt or decrypt, it needs 3 things:
36:         1) A CipherProvider that is initialized to ENCRYPT or DECRYPT
37:         2) A secret Key for the encryption/decryption
38:         3) An Initialization Vector (IvParameterSpec) that is used to create some
39:         randomness in the encryption
40:
41:         See $WS/docs/funcspec/mulan/configurableEncryption.html
42:
43:         See http://java.sun.com/products/JDK/1.1/docs/guide/security/CryptoSpec.html
44:         See http://java.sun.com/products/JDK/1.2/docs/guide/security/CryptoSpec.html
45:         See http://java.sun.com/products/jdk/1.2/jce/index.html
46:         */
47:
48:        public interface CipherProvider {
49:
50:            /**
51:            	Encrypt data - use only with Cipher that has been initialized with
52:            	CipherFactory.ENCRYPT.
53:
54:            	@return The number of bytes stored in ciphertext.
55:
56:            	@param cleartext the byte array containing the cleartext
57:            	@param offset encrypt from this byte offset in the cleartext
58:            	@param length encrypt this many bytes starting from offset
59:            	@param ciphertext the byte array to store the ciphertext
60:            	@param outputOffset the offset into the ciphertext array the output
61:            			should go
62:
63:            	If cleartext and ciphertext are the same array, caller must be careful
64:            	to not overwrite the cleartext before it is scrambled.
65:
66:            	@exception StandardException Standard Cloudscape Error Policy
67:             */
68:            int encrypt(byte[] cleartext, int offset, int length,
69:                    byte[] ciphertext, int outputOffset)
70:                    throws StandardException;
71:
72:            /**
73:            	Decrypt data - use only with Cipher that has been initialized with
74:            	CipherFactory.DECRYPT.
75:
76:            	@return The number of bytes stored in cleartext.
77:
78:            	@param ciphertext the byte array containing the ciphertext
79:            	@param offset decrypt from this byte offset in the ciphertext
80:            	@param length decrypt this many bytes starting from offset
81:            	@param cleartext the byte array to store the cleartext
82:            	@param outputOffset the offset into the cleartext array the output
83:            			should go
84:
85:            	If cleartext and ciphertext are the same array, caller must be careful
86:            	to not overwrite the ciphertext before it is un-scrambled.
87:
88:            	@exception StandardException Standard Cloudscape Error Policy
89:             */
90:            int decrypt(byte[] ciphertext, int offset, int length,
91:                    byte[] cleartext, int outputOffset)
92:                    throws StandardException;
93:
94:            /**
95:             	Returns the encryption block size used during creation of the encrypted database
96:             */
97:            public int getEncryptionBlockSize();
98:        }
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