Same results for Encoding, but different results for hashing

Question

I am trying to compare results of hashing in java and python. i have a snippet of code for java and python both giving same output for Encoding with UTF-8 but giving different(kind of ) results for Hash with sha256.

JAVA code:

String hash = "hello" 
byte[] test = hash.getBytes();
MessageDigest sha = MessageDigest.getInstance("SHA-256");
byte[] key = sha.digest(hash.getBytes());

output: test ==> [104, 101, 108, 108, 111] key ==> [44, -14, 77, -70, 95, -80, -93, 14, 38, -24, 59, 42, -59, -71, -30, -98, 27, 22, 30, 92, 31, -89, 66, 94, 115, 4, 51, 98, -109, -117, -104, 36]

Python code:

hash = "hello"
test = list(bytearray(text.encode()))
m = hashlib.sha256()
m.update(hash.encode("UTF-8"))
data = m.digest()
key = list(data)

output: test ==> same as Java output key ==> [44, 242, 77, 186, 95, 176, 163, 14, 38, 232, 59, 42, 197, 185, 226, 158, 27, 22, 30, 92, 31, 167, 66, 94, 115, 4, 51, 98, 147, 139, 152, 36]

Note that it almost certainly doesn't matter for your input string, but you don't actually specify the encoding in the Java code and it will end up using the platform default encoding. It's better to make it explicit in the .getBytes() call: hash.getBytes(StandardCharsets.UTF_8). — Joachim Sauer
– Joachim Sauer, Commented Oct 17, 2019 at 17:46

Louis Wasserman · Accepted Answer · 2019-10-17 17:43:04Z

2

These are the same results. You're just printing them differently, in a way that uses signed bytes instead of unsigned bytes for Java.

answered Oct 17, 2019 at 17:43

Louis Wasserman

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