android開發中MD5和SHA1加密執行個體

首先，我們來分享MD5和SHA1加密的函數。

public class MD5 {

private static String key = "a6U&1$Ip[Jr/sed]Rfvn=O>Mz+}lXN*%-gLcGD|0";

//MD5加密執行個體
public static String getMD5(String str) throws NoSuchAlgorithmException {
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
e.printStackTrace();
return "";
}
char[] charArray = str.toCharArray();
byte[] byteArray = new byte[charArray.length];
for (int i = 0; i < charArray.length; i++) {
byteArray[i] = (byte) charArray[i];
}
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; i++) {
int val = ((int) md5Bytes[i]) & 0xff;
if (val < 16) {
hexValue.append("0");
}
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}



public static String byte2hex(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length() == 1) {
hs = hs + "0" + stmp;
} else {
hs = hs + stmp;
}
}
return hs;
}

//SHA1 加密執行個體
public static  String encryptToSHA(String info) {
byte[] digesta = null;
try {
// 得到一個SHA-1的訊息摘要
MessageDigest alga = MessageDigest.getInstance("SHA-1");
// 添加要進行計算摘要的資訊
alga.update(info.getBytes());
// 得到該摘要
digesta = alga.digest();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
// 將摘要轉為字串
String rs = byte2hex(digesta);
return rs + key;
}
}