Python HMAC-SHA1 vs Java HMAC-SHA1 different results

Question

I borrowed the HMAC-SHA1 Java code from http://tools.ietf.org/html/rfc6238 and adapted slightly to hardcode it to use one known key/message pair with known output.

I

Answer 1

I think the problem is that in Java, you're using the raw bytes as the key (only converting them to a hex string for output):

System.out.println("Key is..." + bytesToHex(keyBytes) + "\n");
// ...
SecretKeySpec macKey = new SecretKeySpec(keyBytes, "RAW");

But in Python, you're using the hex string:

k = "3132333435363738393031323334353637383930"

It looks like you can decode the hex string with:

raw_key = k.decode('hex')