Java Code Examples for sun.security.util.ArrayUtil#blockSizeCheck()

/**
 * Performs encryption operation.
 *
 * <p>The input plain text <code>plain</code>, starting at
 * <code>plainOffset</code> and ending at
 * <code>(plainOffset + plainLen - 1)</code>, is encrypted.
 * The result is stored in <code>cipher</code>, starting at
 * <code>cipherOffset</code>.
 *
 * @param plain the buffer with the input data to be encrypted
 * @param plainOffset the offset in <code>plain</code>
 * @param plainLen the length of the input data
 * @param cipher the buffer for the result
 * @param cipherOffset the offset in <code>cipher</code>
 * @exception ProviderException if <code>plainLen</code> is not
 * a multiple of the <code>numBytes</code>
 * @return the length of the encrypted data
 */
int encrypt(byte[] plain, int plainOffset, int plainLen,
            byte[] cipher, int cipherOffset) {
    ArrayUtil.blockSizeCheck(plainLen, numBytes);
    ArrayUtil.nullAndBoundsCheck(plain, plainOffset, plainLen);
    ArrayUtil.nullAndBoundsCheck(cipher, cipherOffset, plainLen);

    int nShift = blockSize - numBytes;
    int loopCount = plainLen / numBytes;

    for (; loopCount > 0;
         plainOffset += numBytes, cipherOffset += numBytes,
         loopCount--) {
        embeddedCipher.encryptBlock(register, 0, k, 0);
        for (int i = 0; i < numBytes; i++) {
            cipher[i + cipherOffset] =
                (byte)(k[i] ^ plain[i + plainOffset]);
        }
        if (nShift != 0) {
            System.arraycopy(register, numBytes, register, 0, nShift);
        }
        System.arraycopy(k, 0, register, nShift, numBytes);
    }
    return plainLen;
}
 

/**
 * Performs encryption operation.
 *
 * <p>The input plain text <code>plain</code>, starting at
 * <code>plainOffset</code> and ending at
 * <code>(plainOffset + plainLen - 1)</code>, is encrypted.
 * The result is stored in <code>cipher</code>, starting at
 * <code>cipherOffset</code>.
 *
 * @param plain the buffer with the input data to be encrypted
 * @param plainOffset the offset in <code>plain</code>
 * @param plainLen the length of the input data
 * @param cipher the buffer for the result
 * @param cipherOffset the offset in <code>cipher</code>
 * @exception ProviderException if <code>plainLen</code> is not
 * a multiple of the block size
 * @return the length of the encrypted data
 */
int encrypt(byte[] plain, int plainOffset, int plainLen,
            byte[] cipher, int cipherOffset)
{
    ArrayUtil.blockSizeCheck(plainLen, blockSize);
    ArrayUtil.nullAndBoundsCheck(plain, plainOffset, plainLen);
    ArrayUtil.nullAndBoundsCheck(cipher, cipherOffset, plainLen);

    int i;
    int endIndex = plainOffset + plainLen;

    for (; plainOffset < endIndex;
         plainOffset += blockSize, cipherOffset += blockSize) {
        for (i = 0; i < blockSize; i++) {
            k[i] ^= plain[i + plainOffset];
        }
        embeddedCipher.encryptBlock(k, 0, cipher, cipherOffset);
        for (i = 0; i < blockSize; i++) {
            k[i] = (byte)(plain[i + plainOffset] ^ cipher[i + cipherOffset]);
        }
    }
    return plainLen;
}
 

/**
 * Performs decryption operation.
 *
 * <p>The input cipher text <code>cipher</code>, starting at
 * <code>cipherOffset</code> and ending at
 * <code>(cipherOffset + cipherLen - 1)</code>, is decrypted.
 * The result is stored in <code>plain</code>, starting at
 * <code>plainOffset</code>.
 *
 * @param cipher the buffer with the input data to be decrypted
 * @param cipherOffset the offset in <code>cipherOffset</code>
 * @param cipherLen the length of the input data
 * @param plain the buffer for the result
 * @param plainOffset the offset in <code>plain</code>
 * @exception ProviderException if <code>cipherLen</code> is not
 * a multiple of the block size
 * @return the length of the decrypted data
 */
int decrypt(byte[] cipher, int cipherOffset, int cipherLen,
            byte[] plain, int plainOffset)
{
    ArrayUtil.blockSizeCheck(cipherLen, blockSize);
    ArrayUtil.nullAndBoundsCheck(cipher, cipherOffset, cipherLen);
    ArrayUtil.nullAndBoundsCheck(plain, plainOffset, cipherLen);

    int i;
    int endIndex = cipherOffset + cipherLen;

    for (; cipherOffset < endIndex;
         plainOffset += blockSize, cipherOffset += blockSize) {
        embeddedCipher.decryptBlock(cipher, cipherOffset,
                               plain, plainOffset);
        for (i = 0; i < blockSize; i++) {
            plain[i + plainOffset] ^= k[i];
        }
        for (i = 0; i < blockSize; i++) {
            k[i] = (byte)(plain[i + plainOffset] ^ cipher[i + cipherOffset]);
        }
    }
    return cipherLen;
}
 

/**
 * Performs encryption operation.
 *
 * <p>The input plain text <code>in</code>, starting at <code>inOfs</code>
 * and ending at <code>(inOfs + len - 1)</code>, is encrypted. The result
 * is stored in <code>out</code>, starting at <code>outOfs</code>.
 *
 * @param in the buffer with the input data to be encrypted
 * @param inOfs the offset in <code>in</code>
 * @param len the length of the input data
 * @param out the buffer for the result
 * @param outOfs the offset in <code>out</code>
 * @exception ProviderException if <code>len</code> is not
 * a multiple of the block size
 * @return the number of bytes placed into the <code>out</code> buffer
 */
int encrypt(byte[] in, int inOfs, int len, byte[] out, int outOfs) {
    ArrayUtil.blockSizeCheck(len, blockSize);

    checkDataLength(processed, len);

    processAAD();

    if (len > 0) {
        ArrayUtil.nullAndBoundsCheck(in, inOfs, len);
        ArrayUtil.nullAndBoundsCheck(out, outOfs, len);

        gctrPAndC.update(in, inOfs, len, out, outOfs);
        processed += len;
        ghashAllToS.update(out, outOfs, len);
    }

    return len;
}
 

/**
 * Performs encryption operation.
 *
 * <p>The input plain text <code>plain</code>, starting at
 * <code>plainOffset</code> and ending at
 * <code>(plainOffset + plainLen - 1)</code>, is encrypted.
 * The result is stored in <code>cipher</code>, starting at
 * <code>cipherOffset</code>.
 *
 * @param plain the buffer with the input data to be encrypted
 * @param plainOffset the offset in <code>plain</code>
 * @param plainLen the length of the input data
 * @param cipher the buffer for the result
 * @param cipherOffset the offset in <code>cipher</code>
 * @exception ProviderException if <code>plainLen</code> is not
 * a multiple of the <code>numBytes</code>
 * @return the length of the encrypted data
 */
int encrypt(byte[] plain, int plainOffset, int plainLen,
            byte[] cipher, int cipherOffset) {
    ArrayUtil.blockSizeCheck(plainLen, numBytes);
    ArrayUtil.nullAndBoundsCheck(plain, plainOffset, plainLen);
    ArrayUtil.nullAndBoundsCheck(cipher, cipherOffset, plainLen);

    int nShift = blockSize - numBytes;
    int loopCount = plainLen / numBytes;

    for (; loopCount > 0 ;
         plainOffset += numBytes, cipherOffset += numBytes,
         loopCount--) {
        embeddedCipher.encryptBlock(register, 0, k, 0);
        if (nShift != 0) {
            System.arraycopy(register, numBytes, register, 0, nShift);
        }
        for (int i = 0; i < numBytes; i++) {
            register[nShift + i] = cipher[i + cipherOffset] =
                    (byte)(k[i] ^ plain[i + plainOffset]);
        }
    }
    return plainLen;
}
 

/**
 * Performs decryption operation.
 *
 * <p>The input cipher text <code>cipher</code>, starting at
 * <code>cipherOffset</code> and ending at
 * <code>(cipherOffset + cipherLen - 1)</code>, is decrypted.
 * The result is stored in <code>plain</code>, starting at
 * <code>plainOffset</code>.
 *
 * @param cipher the buffer with the input data to be decrypted
 * @param cipherOffset the offset in <code>cipherOffset</code>
 * @param cipherLen the length of the input data
 * @param plain the buffer for the result
 * @param plainOffset the offset in <code>plain</code>
 * @exception ProviderException if <code>cipherLen</code> is not
 * a multiple of the <code>numBytes</code>
 * @return the length of the decrypted data
 */
int decrypt(byte[] cipher, int cipherOffset, int cipherLen,
            byte[] plain, int plainOffset) {

    ArrayUtil.blockSizeCheck(cipherLen, numBytes);
    ArrayUtil.nullAndBoundsCheck(cipher, cipherOffset, cipherLen);
    ArrayUtil.nullAndBoundsCheck(plain, plainOffset, cipherLen);

    int nShift = blockSize - numBytes;
    int loopCount = cipherLen / numBytes;

    for (; loopCount > 0;
         plainOffset += numBytes, cipherOffset += numBytes,
         loopCount--) {
        embeddedCipher.encryptBlock(register, 0, k, 0);
        if (nShift != 0) {
            System.arraycopy(register, numBytes, register, 0, nShift);
        }
        for (int i = 0; i < numBytes; i++) {
            register[i + nShift] = cipher[i + cipherOffset];
            plain[i + plainOffset]
                = (byte)(cipher[i + cipherOffset] ^ k[i]);
        }
    }
    return cipherLen;
}
 

/**
 * Performs decryption operation.
 *
 * <p>The input cipher text <code>in</code>, starting at
 * <code>inOfs</code> and ending at <code>(inOfs + len - 1)</code>,
 * is decrypted. The result is stored in <code>out</code>, starting at
 * <code>outOfs</code>.
 *
 * @param in the buffer with the input data to be decrypted
 * @param inOfs the offset in <code>in</code>
 * @param len the length of the input data
 * @param out the buffer for the result
 * @param outOfs the offset in <code>out</code>
 * @exception ProviderException if <code>len</code> is not
 * a multiple of the block size
 * @return the number of bytes placed into the <code>out</code> buffer
 */
int decrypt(byte[] in, int inOfs, int len, byte[] out, int outOfs) {
    ArrayUtil.blockSizeCheck(len, blockSize);

    checkDataLength(ibuffer.size(), len);

    processAAD();

    if (len > 0) {
        // store internally until decryptFinal is called because
        // spec mentioned that only return recovered data after tag
        // is successfully verified
        ArrayUtil.nullAndBoundsCheck(in, inOfs, len);
        ibuffer.write(in, inOfs, len);
    }
    return 0;
}
 

/**
 * Performs encryption operation.
 *
 * <p>The input plain text <code>plain</code>, starting at
 * <code>plainOffset</code> and ending at
 * <code>(plainOffset + plainLen - 1)</code>, is encrypted.
 * The result is stored in <code>cipher</code>, starting at
 * <code>cipherOffset</code>.
 *
 * @param plain the buffer with the input data to be encrypted
 * @param plainOffset the offset in <code>plain</code>
 * @param plainLen the length of the input data
 * @param cipher the buffer for the result
 * @param cipherOffset the offset in <code>cipher</code>
 * @exception ProviderException if <code>len</code> is not
 * a multiple of the block size
 * @return the length of the encrypted data
 */
int encrypt(byte[] plain, int plainOffset, int plainLen,
            byte[] cipher, int cipherOffset) {
    if (plainLen <= 0) {
        return plainLen;
    }
    ArrayUtil.blockSizeCheck(plainLen, blockSize);
    ArrayUtil.nullAndBoundsCheck(plain, plainOffset, plainLen);
    ArrayUtil.nullAndBoundsCheck(cipher, cipherOffset, plainLen);
    return implEncrypt(plain, plainOffset, plainLen,
                       cipher, cipherOffset);
}
 

/**
 * Performs decryption operation.
 *
 * <p>The input cipher text <code>cipher</code>, starting at
 * <code>cipherOffset</code> and ending at
 * <code>(cipherOffset + cipherLen - 1)</code>, is decrypted.
 * The result is stored in <code>plain</code>, starting at
 * <code>plainOffset</code>.
 *
 * <p>It is also the application's responsibility to make sure that
 * <code>init</code> has been called before this method is called.
 * (This check is omitted here, to avoid double checking.)
 *
 * @param cipher the buffer with the input data to be decrypted
 * @param cipherOffset the offset in <code>cipherOffset</code>
 * @param cipherLen the length of the input data
 * @param plain the buffer for the result
 * @param plainOffset the offset in <code>plain</code>
 * @exception ProviderException if <code>len</code> is not
 * a multiple of the block size
 * @return the length of the decrypted data
 */
int decrypt(byte[] cipher, int cipherOffset, int cipherLen,
            byte[] plain, int plainOffset) {
    if (cipherLen <= 0) {
        return cipherLen;
    }
    ArrayUtil.blockSizeCheck(cipherLen, blockSize);
    ArrayUtil.nullAndBoundsCheck(cipher, cipherOffset, cipherLen);
    ArrayUtil.nullAndBoundsCheck(plain, plainOffset, cipherLen);
    return implDecrypt(cipher, cipherOffset, cipherLen, plain, plainOffset);
}
 

/**
 * Performs encryption operation.
 *
 * <p>The input plain text <code>in</code>, starting at
 * <code>inOff</code> and ending at * <code>(inOff + len - 1)</code>,
 * is encrypted. The result is stored in <code>out</code>, starting at
 * <code>outOff</code>.
 *
 * @param in the buffer with the input data to be encrypted
 * @param inOff the offset in <code>plain</code>
 * @param len the length of the input data
 * @param out the buffer for the result
 * @param outOff the offset in <code>cipher</code>
 * @exception ProviderException if <code>len</code> 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);
}
 

/**
  * Performs decryption operation.
  *
  * <p>The input cipher text <code>in</code>, starting at
  * <code>inOff</code> and ending at * <code>(inOff + len - 1)</code>,
  * is decrypted.The result is stored in <code>out</code>, starting at
  * <code>outOff</code>.
  *
  * @param in the buffer with the input data to be decrypted
  * @param inOff the offset in <code>cipherOffset</code>
  * @param len the length of the input data
  * @param out the buffer for the result
  * @param outOff the offset in <code>plain</code>
  * @exception ProviderException if <code>len</code> 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);
}