【微信开发-JavaWeb】SHA1算法

微信开发-SHA1算法

public static String getSha1(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'};

try {
MessageDigest 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 byte0 = md[i];
buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
buf[k++] = hexDigits[byte0 & 0xf];
}
return new String(buf);
} catch (Exception e) {
return null;
}
}