求sha1加密代碼！
請問誰能發(fā)一下那個sha1加密的java代碼
童年像是一場夢
2016-04-23
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2016-04-24
看著老師的敲就好了啊：
private static String SHA1(String str) {
if (str == null || str.length() == 0) {
return null;
}
char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
MessageDigest mdTemp;
try {
mdTemp = MessageDigest.getInstance("SHA1");
mdTemp.update(str.getBytes("UTF-8"));
byte[] md = mdTemp.digest();
int j = md.length;
char buf[] = new char[j * 2];
int k = 0;
for (int i = 0; i < j; i++) {
byte b0 = md[i];
buf[k++] = hexDigits[b0 >>> 4 & 0xf];
buf[k++] = hexDigits[b0 & 0xf];
}
return new String(buf);
} catch (Exception e) {
return null;
}
}