去年我在C#中编写了一次性密码(OTP)生成器.现在我需要在
Java中使用OTP生成器,但是我找不到Java中的等效函数.
这是我去年写的代码:(我知道这个OTP的安全性很低,但我不需要防弹的代码)
SHA1CryptoServiceProvider hash = new SHA1CryptoServiceProvider(); //first hash with sha1 byte[] hashPass = hash.ComputeHash(Encoding.ASCII.GetBytes(pass)); //pass is entered by user HMACMD5 hma = new HMACMD5(hashPass); // use the hashed value as a key to hmac OTPass = hma.ComputeHash(Encoding.ASCII.GetBytes(email + Counter(email)));// generate OTPass,Counter(email) is the counter of the user taken from database increaseCounter(email); // updating the counter this.SetLog(this.GetLog() + Environment.NewLine + "OTPass Generated: " + BitConverter.ToString(OTPass)); // OTP
这是我试图将C#转换为的Java代码:(这只是SHA1部分,我找不到如何用Java编写HMAC-MD5)
import java.io.*; import java.security.*; public class otp { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { System.out.println("Please enter your username:"); BufferedReader br = new BufferedReader(new InputStreamReader(system.in)); String username = br.readLine(); System.out.println("Please enter your password:"); String password = br.readLine(); try { MessageDigest md = MessageDigest.getInstance("SHA1"); String input = password; md.update(input.getBytes()); byte[] output = md.digest(); System.out.println(); System.out.println("SHA1(\""+input+"\") ="); System.out.println(" "+bytesToHex(output)); } catch (Exception e) { System.out.println("Exception: "+e); } } public static String bytesToHex(byte[] b) { char hexDigit[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'}; StringBuffer buf = new StringBuffer(); for (int j=0; j<b.length; j++) { buf.append(hexDigit[(b[j] >> 4) & 0x0f]); buf.append(hexDigit[b[j] & 0x0f]); } return buf.toString(); } }
感谢帮助
解决方法
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