在java中使用密钥计算HMAC-SHA512 [英] Compute HMAC-SHA512 with secret key in java
问题描述
我想要兴奋地构建一个函数,它生成一个带有密钥的HMAC,就像这个站点提供的那样:
i want to build excatly a function which produces a HMAC with a secret key like this site provides:
http://www.freeformatter.com/hmac-generator.html
java 8 lib只提供MessageDigest和KeyGenerator,它们最多只支持SH256。
The java 8 lib only provides MessageDigest and KeyGenerator which both only supports up to SH256.
google也没有给我任何结果来生成HMAC。
Also google doesnt give me any result to an implementation to generate a HMAC.
有人知道实现吗?
我有这个代码生成一个普通的SH256,但我想这对我没什么帮助:
I have this code to generate an ordinary SH256 but i guess this doesnt help me much:
public static String get_SHA_512_SecurePassword(String passwordToHash) throws Exception {
String generatedPassword = null;
MessageDigest md = MessageDigest.getInstance("SHA-512");
byte[] bytes = md.digest(passwordToHash.getBytes("UTF-8"));
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.length; i++) {
sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
}
generatedPassword = sb.toString();
System.out.println(generatedPassword);
return generatedPassword;
}
推荐答案
希望这会有所帮助:
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
public class Test1 {
public static void main(String[] args) {
Mac sha512_HMAC = null;
String result = null;
String key = "Welcome1";
try{
byte [] byteKey = key.getBytes("UTF-8");
final String HMAC_SHA512 = "HmacSHA512";
sha512_HMAC = Mac.getInstance(HMAC_SHA512);
SecretKeySpec keySpec = new SecretKeySpec(byteKey, HMAC_SHA512);
sha512_HMAC.init(keySpec);
byte [] mac_data = sha512_HMAC.
doFinal("My message".getBytes("UTF-8"));
//result = Base64.encode(mac_data);
result = bytesToHex(mac_data);
System.out.println(result);
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidKeyException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
System.out.println("Done");
}
}
public static String bytesToHex(byte[] bytes) {
final char[] hexArray = "0123456789ABCDEF".toCharArray();
char[] hexChars = new char[bytes.length * 2];
for ( int j = 0; j < bytes.length; j++ ) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
}
要从字节数组转换为十六进制,请参阅此stackoverflow答案:此处
For converting from byte array to hex refer this stackoverflow answer : here
这篇关于在java中使用密钥计算HMAC-SHA512的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!