Java method which can provide the same output as Python method for HMAC-SHA256 in Hex

2024/4/15 1:51:25

I am now trying to encode the string using HMAC-SHA256 using Java. The encoded string required to match another set of encoded string generated by Python using, myPolicy, hashlib.sha256).hexdigest(). I have tried

    Mac sha256_HMAC = Mac.getInstance("HmacSHA256");SecretKeySpec secretKey = new SecretKeySpec(secret.getBytes(), "HmacSHA256");sha256_HMAC.init(secretKey);byte[] hash = sha256_HMAC.doFinal(policy.getBytes());byte[] hexB = new Hex().encode(hash);String check = Hex.encodeHexString(hash);String sha256 = DigestUtils.sha256Hex(secret.getBytes());

after I print them out, hash, hexB, check and sha256 didn't provide the same result as the following Python encryption method, myPolicy, hashlib.sha256).hexdigest()

So, I have try to looking for the library or something that work similar to the above Python function. Can anybody help me out?


Are you sure your key and input are identical and correctly encoded in both java and python?

HMAC-SHA256 works the same on both platforms.


Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
SecretKeySpec secretKey = new SecretKeySpec("1234".getBytes(), "HmacSHA256");
byte[] hash = sha256_HMAC.doFinal("test".getBytes());
String check = Hex.encodeHexString(hash);
System.out.println(new String(check));Output


print"1234", "test", hashlib.sha256).hexdigest();Output

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