用java中的密钥计算HMAC-SHA512
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Compute HMAC-SHA512 with secret key in java
提问by PowerFlower
i want to build excatly a function which produces a HMAC with a secret key like this site provides:
我想完全构建一个函数，该函数生成一个带有密钥的 HMAC，就像这个站点提供的：
http://www.freeformatter.com/hmac-generator.html
http://www.freeformatter.com/hmac-generator.html
The java 8 lib only provides MessageDigest and KeyGenerator which both only supports up to SH256.
java 8 lib 只提供 MessageDigest 和 KeyGenerator，两者都只支持最高 SH256。
Also google doesnt give me any result to an implementation to generate a HMAC.
此外，谷歌没有给我任何生成 HMAC 的实现结果。
Does someone know a implementation?
有人知道实现吗？
I have this code to generate an ordinary SH256 but i guess this doesnt help me much:
我有这个代码来生成一个普通的 SH256，但我想这对我没有多大帮助：
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;
}
采纳答案by dvsakgec
Hope this helps:
希望这可以帮助：
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
public class Test1 {
private static final String HMAC_SHA512 = "HmacSHA512";
public static void main(String[] args) {
Mac sha512Hmac;
String result;
final String key = "Welcome1";
try {
final byte[] byteKey = key.getBytes(StandardCharsets.UTF_8);
sha512Hmac = Mac.getInstance(HMAC_SHA512);
SecretKeySpec keySpec = new SecretKeySpec(byteKey, HMAC_SHA512);
sha512Hmac.init(keySpec);
byte[] macData = sha512Hmac.doFinal("My message".getBytes(StandardCharsets.UTF_8));
// Can either base64 encode or put it right into hex
result = Base64.getEncoder().encodeToString(macData);
//result = bytesToHex(macData);
} catch (UnsupportedEncodingException | InvalidKeyException | NoSuchAlgorithmException e) {
e.printStackTrace();
} finally {
// Put any cleanup here
System.out.println("Done");
}
}
}
For converting from byte array to hex refer this stackoverflow answer : here
要将字节数组转换为十六进制，请参阅此 stackoverflow 答案：此处
回答by Dhanendra Pratap Singh
The simplest way can be -
最简单的方法可以是——
private static final String HMAC_SHA512 = "HmacSHA512";
private static String toHexString(byte[] bytes) {
Formatter formatter = new Formatter();
for (byte b : bytes) {
formatter.format("%02x", b);
}
return formatter.toString();
}
public static String calculateHMAC(String data, String key)
throws SignatureException, NoSuchAlgorithmException, InvalidKeyException
{
SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), HMAC_SHA512);
Mac mac = Mac.getInstance(HMAC_SHA512);
mac.init(secretKeySpec);
return toHexString(mac.doFinal(data.getBytes()));
}
public static void main(String[] args) throws Exception {
String hmac = calculateHMAC("data", "key");
System.out.println(hmac);
}
You can change the HMAC_SHA512 variable to any of the Mac algorithm and the code will work the same way.
您可以将 HMAC_SHA512 变量更改为任何 Mac 算法，代码将以相同的方式工作。
