I'm looking for an implementation of the SHA-256 hash function written in Python. I want to use it to get a better understanding of how the SHA-256 function works, and I think Python is the ideal language for this. Pseudo-code has the limitation that I can't run/test it, to see what my modifications of the code do to the output.
I'm writing a SHA256 implementation in Python, padding, parsing and message schedule seem to work fine, my problem lies in the hash computation. Currently I'm just trying to calculate the working variable 'a'.This is the value I get (In hex)
Expected Output, according to this:
Here is my code:
Set the working variables to the constants specified in FIPS-180
a = int('6a09e667', 16)b = int('bb67ae85', 16)c = int('3c6ef372', 16)d = int('a54ff53a', 16)e = int('510e527f', 16)f = int('9b05688c', 16)g = int('1f83d9ab', 16)h = int('5be0cd19', 16)
Set the two important variables that depend on value t:
W = int('61626380', 16)K = int('428a2f98', 16)
From the pseudo code on wikipedia:
S1 = hash.ROTR(e, 6) ^ hash.ROTR(e, 11) ^ hash.ROTR(e, 25)ch = (e & f) ^ ((~e) & g)#((e1) & g)temp1 = (h + S1 + ch + K + W) % math.pow(2, 32)S0 = hash.ROTR(a, 2) ^ hash.ROTR(a, 13) ^ hash.ROTR(a, 22)maj = (a & b) ^ (a & c) ^ (b & c)temp2 = (S0 + maj) % math.pow(2, 32)a = int((temp1 + temp2) % math.pow(2, 32))
@staticmethoddef ROTR(x, n, w=32): return (x >> n) | (x << w - n)
Or, split into functions, like specified in FIPS-180 (Prodcuces the same output)
T1 = int((h + hash.SIGMA1(e) + hash.Ch(e, f, g) + hash.K[t] + W) % math.pow(2, 32))T2 = int((hash.SIGMA0(a) + hash.Maj(a, b, c)) % math.pow(2, 32))a = int((T1 + T2) % math.pow(2, 32))
@staticmethoddef ROTR(x, n, w=32): return (x >> n) | (x << w - n)def SIGMA0(x): return hash.ROTR(x, 2) ^ hash.ROTR(x, 13) ^ hash.ROTR(x, 22)def SIGMA1(x): return hash.ROTR(x, 6) ^ hash.ROTR(x, 11) ^ hash.ROTR(x, 25)def Ch(x, y, z): return (x & y) ^ (~x & z)def Maj(x, y, z): return (x & y) ^ (x & z) ^ (y & z)
I'm using Python 3 btw. Thanks in advance.
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I'm afraid this is all there is to ask, but if more elaboration is needed please do not hesitate to tell me in a comment.
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