SHA1 Hash on Hex String

I'm trying to hash a number, represented by hex string with Java security library. Meaning, If I have the String "AABBCCDD" I want to hash it not as this is an ascii input, which is 0x65, 0x65, 0x66, 0x66, 0x67, 0x67, 0x68, 0x68, but as four bytes - 0xAA, 0xBB, 0xCC, 0xDD. I managed to do it with low values such as "112233445566" (since bytes are signed in Java) but failed with high values.

Does someone know how to implement such thing?

Thanks, Binyamin


First convert your hex into byte[] using for example this: Convert a string representation of a hex dump to a byte array using Java?

After it use

byte[] data = hexStringToByteArray(hexData);
MessageDigest md = MessageDigest.getInstance("SHA-1");
md.update(data, 0, data.length);
byte[] sha1hash = md.digest();

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