用Java中的密钥计算HMAC-SHA512
我想专门构建一个函数,该函数生成带有此站点提供的密钥的HMAC:
http://www.freeformatter.com/hmac-
generator.html
Java 8库仅提供MessageDigest和KeyGenerator,它们均仅最多支持SH256。
谷歌也没有给我任何实现生成HMAC的结果。
有人知道实现吗?
我有这段代码来生成普通的SH256,但是我想这对我没有太大帮助:
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;
}
回答:
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");
}
}
}
从字节数组转换为十六进制请参阅本计算器答案:这里
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