Created
July 31, 2014 07:27
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银联mac算法, 示例
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// 示例代码 | |
class SampleSM { | |
... | |
public byte[] generateUnpayMACImpl(byte[] data, SecureDESKey kd) | |
throws SMException { | |
data = ISOUtil.concat(data, new byte[8]); | |
int len = data.length - data.length % 8; | |
if (data.length != len) { | |
data = ISOUtil.trim(data, len); | |
} else { | |
data = ISOUtil.trim(data, len - 8); | |
} | |
byte[] mac = new byte[8]; | |
byte[] tmp = new byte[8]; | |
byte[] block = new byte[8]; | |
for (int i = 0; i < data.length / 8; i++) { | |
System.arraycopy(data, i * 8, tmp, 0, 8); | |
block = ISOUtil.xor(block, tmp); | |
} | |
block = ISOUtil.hexString(block).getBytes(); | |
System.arraycopy(block, 0, tmp, 0, 8); | |
Key mak = decryptFromLMK(kd); | |
mac = this.jceHandler.encryptData(tmp, mak); | |
System.arraycopy(block, 8, tmp, 0, 8); | |
tmp = ISOUtil.xor(mac, tmp); | |
mac = this.jceHandler.encryptData(tmp, mak); | |
block = ISOUtil.hexString(mac).getBytes(); | |
System.arraycopy(block, 0, mac, 0, 8); | |
return mac; | |
} | |
... | |
} |
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