META-INF.modules.java.base.classes.com.sun.crypto.provider.ElectronicCodeBook Maven / Gradle / Ivy
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.crypto.provider;
import java.security.InvalidKeyException;
import java.security.ProviderException;
import sun.security.util.ArrayUtil;
import java.util.Objects;
import jdk.internal.HotSpotIntrinsicCandidate;
/**
* This class represents ciphers in electronic codebook (ECB) mode.
*
* This mode is implemented independently of a particular cipher.
* Ciphers to which this mode should apply (e.g., DES) must be
* plugged-in using the constructor.
*
*
NOTE: This class does not deal with buffering or padding.
*
* @author Gigi Ankeny
*/
final class ElectronicCodeBook extends FeedbackCipher {
ElectronicCodeBook(SymmetricCipher embeddedCipher) {
super(embeddedCipher);
}
/**
* Gets the name of the feedback mechanism
*
* @return the name of the feedback mechanism
*/
String getFeedback() {
return "ECB";
}
/**
* Resets the iv to its original value.
* This is used when doFinal is called in the Cipher class, so that the
* cipher can be reused (with its original iv).
*/
void reset() {
// empty
}
/**
* Save the current content of this cipher.
*/
void save() {}
/**
* Restores the content of this cipher to the previous saved one.
*/
void restore() {}
/**
* Initializes the cipher in the specified mode with the given key
* and iv.
*
* @param decrypting flag indicating encryption or decryption
* @param algorithm the algorithm name
* @param key the key
* @param iv the iv
*
* @exception InvalidKeyException if the given key is inappropriate for
* initializing this cipher
*/
void init(boolean decrypting, String algorithm, byte[] key, byte[] iv)
throws InvalidKeyException {
if ((key == null) || (iv != null)) {
throw new InvalidKeyException("Internal error");
}
embeddedCipher.init(decrypting, algorithm, key);
}
@HotSpotIntrinsicCandidate
private int implECBEncrypt(byte [] in, int inOff, int len, byte[] out, int outOff) {
for (int i = len; i >= blockSize; i -= blockSize) {
embeddedCipher.encryptBlock(in, inOff, out, outOff);
inOff += blockSize;
outOff += blockSize;
}
return len;
}
/**
* Performs encryption operation.
*
*
The input plain text in, starting at
* inOff and ending at * (inOff + len - 1),
* is encrypted. The result is stored in out, starting at
* outOff.
*
* @param in the buffer with the input data to be encrypted
* @param inOff the offset in plain
* @param len the length of the input data
* @param out the buffer for the result
* @param outOff the offset in cipher
* @exception ProviderException if len is not
* a multiple of the block size
* @return the length of the encrypted data
*/
int encrypt(byte[] in, int inOff, int len, byte[] out, int outOff) {
ArrayUtil.blockSizeCheck(len, blockSize);
ArrayUtil.nullAndBoundsCheck(in, inOff, len);
ArrayUtil.nullAndBoundsCheck(out, outOff, len);
return implECBEncrypt(in, inOff, len, out, outOff);
}
@HotSpotIntrinsicCandidate
private int implECBDecrypt(byte [] in, int inOff, int len, byte[] out, int outOff) {
for (int i = len; i >= blockSize; i -= blockSize) {
embeddedCipher.decryptBlock(in, inOff, out, outOff);
inOff += blockSize;
outOff += blockSize;
}
return len;
}
/**
* Performs decryption operation.
*
*
The input cipher text in, starting at
* inOff and ending at * (inOff + len - 1),
* is decrypted.The result is stored in out, starting at
* outOff.
*
* @param in the buffer with the input data to be decrypted
* @param inOff the offset in cipherOffset
* @param len the length of the input data
* @param out the buffer for the result
* @param outOff the offset in plain
* @exception ProviderException if len is not
* a multiple of the block size
* @return the length of the decrypted data
*/
int decrypt(byte[] in, int inOff, int len, byte[] out, int outOff) {
ArrayUtil.blockSizeCheck(len, blockSize);
ArrayUtil.nullAndBoundsCheck(in, inOff, len);
ArrayUtil.nullAndBoundsCheck(out, outOff, len);
return implECBDecrypt(in, inOff, len, out, outOff);
}
}