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问题:
I am trying to create a signature using the HMAC-SHA256 algorithm and this is my code.
I am using US ASCII encoding.
final Charset asciiCs = Charset.forName("US-ASCII");
final Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
final SecretKeySpec secret_key = new javax.crypto.spec.SecretKeySpec(asciiCs.encode("key").array(), "HmacSHA256");
final byte[] mac_data = sha256_HMAC.doFinal(asciiCs.encode("The quick brown fox jumps over the lazy dog").array());
String result = "";
for (final byte element : mac_data)
{
result += Integer.toString((element & 0xff) + 0x100, 16).substring(1);
}
System.out.println("Result:[" + result + "]");
The result that I am getting from the above code is:
f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
This is same as to that of shown in the wiki
HMAC_SHA256("key", "The quick brown fox jumps over the lazy dog") = 0x f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
except for the 0x
.
I am looking for ideas/comments if I am doing everything right or may be I can improve my code.
回答1:
The 0x just denotes that the characters after it represent a hex string.
0x1A == 1Ah == 26 == 1A
So the 0x is just to clarify what format the output is in, no need to worry about it.
回答2:
Here is my solution:
public static String encode(String key, String data) throws Exception {
Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
sha256_HMAC.init(secret_key);
return Hex.encodeHexString(sha256_HMAC.doFinal(data.getBytes("UTF-8")));
}
public static void main(String [] args) throws Exception {
System.out.println(encode("key", "The quick brown fox jumps over the lazy dog"));
}
Or you can return the hash encoded in Base64:
Base64.encodeBase64String(sha256_HMAC.doFinal(data.getBytes("UTF-8")));
The output in hex is as expected:
f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
回答3:
The answer that you got there is correct. One minor thing in the code above, you need to init(key) before you can call doFinal()
final Charset charSet = Charset.forName("US-ASCII");
final Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
final SecretKeySpec secret_key = new javax.crypto.spec.SecretKeySpec(charSet.encode("key").array(), "HmacSHA256");
try {
sha256_HMAC.init(secret_key);
} catch (InvalidKeyException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
...
回答4:
This is working fine for me
I have add dependency
compile 'commons-codec:commons-codec:1.9'
ref: http://mvnrepository.com/artifact/commons-codec/commons-codec/1.9
my function
public String encode(String key, String data) {
try {
Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
sha256_HMAC.init(secret_key);
return new String(Hex.encodeHex(sha256_HMAC.doFinal(data.getBytes("UTF-8"))));
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return null;
}
回答5:
If you're using Guava, its latest release now lets you use
Hashing.hmacSha256()
回答6:
Here is my solution:
public String HMAC_SHA256(String secret, String message)
{
String hash="";
try{
Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
SecretKeySpec secret_key = new SecretKeySpec(secret.getBytes(), "HmacSHA256");
sha256_HMAC.init(secret_key);
hash = Base64.encodeToString(sha256_HMAC.doFinal(message.getBytes()), Base64.DEFAULT);
}catch (Exception e)
{
}
return hash.trim();
}
回答7:
If but any chance you found a solution how to calculate HMAC-SHA256 here, but you're getting an exception like this one:
java.lang.NoSuchMethodError: No static method
encodeHexString([B)Ljava/lang/String; in class
Lorg/apache/commons/codec/binary/Hex; or its super classes
(declaration of 'org.apache.commons.codec.binary.Hex' appears in
/system/framework/org.apache.http.legacy.boot.jar)
Then use:
public static String encode(String key, String data) {
try {
Mac hmac = Mac.getInstance("HmacSHA256");
SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
hmac.init(secret_key);
return new String(Hex.encodeHex(hmac.doFinal(data.getBytes("UTF-8"))));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
回答8:
Java simple code to generate encoded(HMAC-x) signatures. (Tried using Java-8 and Eclipse)
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import com.sun.org.apache.xml.internal.security.utils.Base64;
/**
* Encryption class to show how to generate encoded(HMAC-x) signatures.
*
*/
public class Encryption {
public static void main(String args[]) {
String message = "This is my message.";
String key = "your_key";
String algorithm = "HmacMD5"; // OPTIONS= HmacSHA512, HmacSHA256, HmacSHA1, HmacMD5
try {
// 1. Get an algorithm instance.
Mac sha256_hmac = Mac.getInstance(algorithm);
// 2. Create secret key.
SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), algorithm);
// 3. Assign secret key algorithm.
sha256_hmac.init(secret_key);
// 4. Generate Base64 encoded cipher string.
String hash = Base64.encode(sha256_hmac.doFinal(message.getBytes("UTF-8")));
// You can use any other encoding format to get hash text in that encoding.
System.out.println(hash);
/**
* Here are the outputs for given algorithms:-
*
* HmacMD5 = hpytHW6XebJ/hNyJeX/A2w==
* HmacSHA1 = CZbtauhnzKs+UkBmdC1ssoEqdOw=
* HmacSHA256 =gCZJBUrp45o+Z5REzMwyJrdbRj8Rvfoy33ULZ1bySXM=
* HmacSHA512 = OAqi5yEbt2lkwDuFlO6/4UU6XmU2JEDuZn6+1pY4xLAq/JJGSNfSy1if499coG1K2Nqz/yyAMKPIx9C91uLj+w==
*/
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
}
}
}
NOTE: You can use any other encryption instead of Base64
(eg: ASCII
). Also you can try generating HmacMD5
, HmacSHA1
, HmacSHA256
, HmacSHA512
signatures.
回答9:
Try this
Sorry for being late, I have tried all above answers but none of them is giving me correct value, After doing the lot of R&D I have found a simple way that gives me exact value.
Declare this method in your class
private String hmacSha(String KEY, String VALUE, String SHA_TYPE) {
try {
SecretKeySpec signingKey = new SecretKeySpec(KEY.getBytes("UTF-8"), SHA_TYPE);
Mac mac = Mac.getInstance(SHA_TYPE);
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(VALUE.getBytes("UTF-8"));
byte[] hexArray = {(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7', (byte)'8', (byte)'9', (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f'};
byte[] hexChars = new byte[rawHmac.length * 2];
for ( int j = 0; j < rawHmac.length; j++ ) {
int v = rawHmac[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
catch (Exception ex) {
throw new RuntimeException(ex);
}
}
Use this like
Log.e("TAG", "onCreate: "+hmacSha("key","text","HmacSHA256"));
Verification
1.Android studio output
2. Online HMAC generator Output(Visit here for Online Genrator)