HexTranslator.java
资源名称:security.rar [点击查看]
上传用户:lior1029
上传日期:2013-05-07
资源大小:209k
文件大小:2k
源码类别:
CA认证
开发平台:
Java
- package org.bouncycastle.util.encoders;
- /**
- * Converters for going from hex to binary and back. Note: this class assumes ASCII processing.
- */
- public class HexTranslator
- implements Translator
- {
- private static final byte[] hexTable =
- {
- (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7',
- (byte)'8', (byte)'9', (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f'
- };
- /**
- * size of the output block on encoding produced by getDecodedBlockSize()
- * bytes.
- */
- public int getEncodedBlockSize()
- {
- return 2;
- }
- public int encode(
- byte[] in,
- int inOff,
- int length,
- byte[] out,
- int outOff)
- {
- for (int i = 0, j = 0; i < length; i++, j += 2)
- {
- out[outOff + j] = hexTable[(in[inOff] >> 4) & 0x0f];
- out[outOff + j + 1] = hexTable[in[inOff] & 0x0f];
- inOff++;
- }
- return length * 2;
- }
- /**
- * size of the output block on decoding produced by getEncodedBlockSize()
- * bytes.
- */
- public int getDecodedBlockSize()
- {
- return 1;
- }
- public int decode(
- byte[] in,
- int inOff,
- int length,
- byte[] out,
- int outOff)
- {
- int halfLength = length / 2;
- byte left, right;
- for (int i = 0; i < halfLength; i++)
- {
- left = in[inOff + i * 2];
- right = in[inOff + i * 2 + 1];
- if (left < (byte)'a')
- {
- out[outOff] = (byte)((left - '0') << 4);
- }
- else
- {
- out[outOff] = (byte)((left - 'a' + 10) << 4);
- }
- if (right < (byte)'a')
- {
- out[outOff] += (byte)(right - '0');
- }
- else
- {
- out[outOff] += (byte)(right - 'a' + 10);
- }
- outOff++;
- }
- return halfLength;
- }
- }