def MGF1(mgfSeed, maskLen):
if maskLen > 2**32:
print("maskLen too large")
sys.exit()
hLen = 20 #sha1 outputs 20 bytes
T = bytearray()
#0 to \ceil (maskLen / hLen) - 1
#skip -1 because range does not include endpoint
for counter in range(math.ceil(maskLen / hLen)):
C = I2OSP(counter, 4)
#T = T || Hash(mgfSeed || C)
#T =
mgfSeed_bytearray = fc.hex_to_bytearray(mgfSeed)
T = T + fc.hex_to_bytearray(
hashlib.sha1(mgfSeed_bytearray + C).hexdigest())
#Output the leading maskLen octets of T as the octet string mask
return str(binascii.hexlify(T[:maskLen]))[2:][:-1]
def encode_key(p, q, e):
version = 0
n = p * q
d = modinv(e, (p - 1) * (q - 1))
exp1 = d % (p - 1) #FEL
exp2 = d % (q - 1) #FEL
coef = modinv(q, p) #CORRECT
pem = str(
der_encode(version) + der_encode(n) + der_encode(e) + der_encode(d) +
der_encode(p) + der_encode(q) + der_encode(exp1) + der_encode(exp2) +
der_encode(coef))
L = int(len(pem) / 2)
seq = "30"
if L > 127:
seq = seq + "81" + fc.int2hex(L).zfill(
2) if L < 256 else seq + "82" + fc.int2hex(L).zfill(4)
else:
seq = seq + fc.int2hex(L).zfill(2)
print(seq)
pem = base64.b64encode(fc.hex_to_bytearray(seq + pem))
return str(pem)[2:][:len(pem)]
def encode_key(p, q, e):
V = ''.join(map(encode_integer_tlv, compute_values(p, q, e)))
base64_key = base64.b64encode(fc.hex_to_bytearray(encode_sequence_tlv(V)))
return str(base64_key)[2:][:-1]
def test_hex_to_bytearray(self):
self.assertEqual(list(format_converter.hex_to_bytearray("000001f4")),
[0, 0, 1, 244])
def f(x_i, y_i):
x_bytearray = fc.hex_to_bytearray(x_i)
y_bytearray = fc.hex_to_bytearray(y_i)
return fc.hex_to_int(fc.hash_bytearray(x_bytearray + y_bytearray))
def hash(mgfSeed, val):
return hashlib.sha1(fc.hex_to_bytearray(mgfSeed) + val).hexdigest()
def transform_func(hex):
return fc.hash_bytearray(fc.hex_to_bytearray(hex))
def f(x_i, y_i):
#return fc.bytearray_to_int(fc.hash_bytearray(fc.hex_to_bytearray(x_i) + fc.hex_to_bytearray(y_i)))
x_bytearray = fc.hex_to_bytearray(x_i)
y_bytearray = fc.hex_to_bytearray(y_i)
return fc.hex_to_int(fc.hash_bytearray(x_bytearray + y_bytearray))
