class oracle:
def __init__(self):
self.rsa = RSA()
self.pub,self.priv = self.rsa.keygen(l=512) # 1024 bits key
def getpubkey(self):
return self.pub
def iseven(self,ct):
return ord(self.rsa.decrypt(ct,self.priv)[-1]) & 1 == 0
#!/usr/bin/env python
from c39 import RSA # RSA
from c36 import i2s, s2i
if __name__ == "__main__":
msg = "attack after the breakfast"
rsa = RSA()
pub,priv = rsa.keygen()
C = rsa.encrypt(msg,pub)
assert rsa.decrypt(C,priv) == msg, "bug in my RSA, decryption didn't provide the same clear text"
S = 3 # lowest possible S
C1 = list() # the cipher text is a list
for ct in C: # lets iterate over the ciphertext
C1.append(i2s((pow(S,pub[0],pub[1])*s2i(ct)) % pub[1])) #
if C1 != C: # the C1 has to be different the C
P1 = rsa.decrypt(C1,priv)
print i2s((s2i(P1)/S)%pub[1])
else:
print "something wrong C1 and C should be different"
raise Exception("e not equal 3")
pkcs15 = PKCS15()
dgst = hashlib.sha1(mesg).digest()
keylen = len(i2s(n))
getcontext().prec = keylen * 8
# this is the valid beginning
forge = "\x00\x01%s\x00%s" % ("\xff" * 8, dgst)
# this will be garbge
garbage = "\x00" * (keylen - 8 - len(dgst) - 13)
whole = s2i(forge+garbage)
cr = int(pow(whole,Decimal(1)/Decimal(3)))+1
return i2s(cr)
if __name__ == "__main__":
message = "hi mom"
re = RSA()
pub1,priv1 = re.keygen(l=512,s=False)
rs = RSAsign()
sign = rs.make(message,priv1)
assert rs.verify(message,sign,pub1), "signature algo wrong"
signf = [ forging(message,pub1) ]
if rs.verify(message,signf,pub1):
print "ok"
if count % 10 == 0:
sys.stdout.write("%s \r" % (count))
sys.stdout.flush()
count += 1
return s1
if __name__ == "__main__":
rsa = RSA()
pkcs = PKCS15t2()
# clear text message
text = "kick it, CC"
# 256 bit key generation
(pubkey, prvkey) = rsa.keygen(256)
# padding PKCS#1 1.5
m = pkcs.pad(text, len(i2s(pubkey[1])))
# encrypting
c = rsa.encrypt(m, pubkey)
m1 = rsa.decrypt(c, prvkey)
assert (m == "\x00"+m1), "PKCS#1 1.5 implementation failure"
assert (text == pkcs.unpad("\x00"+m1)), "RSA implementation failure"
# Bleichenbacher
print b_step2a(pubkey, prvkey, c, oracle)
