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import sha
def bin2long(s):
return reduce( lambda x,y:(x<<8L)+y, map(ord, s))
def long2bin(l):
res = ""
for byte in range(128):
res += chr((l >> (1024 - (byte + 1) * 8)) & 0xff)
return res
def rsa_pub1024(src, mod):
return long2bin(pow(bin2long(src), 65537, bin2long(mod)))
def decrypt_block(src, mod):
if len(src) != 128 and len(src) != 202:
return None
dest = rsa_pub1024(src[:128], mod)
hash = sha.new(dest[1:107])
if len(src) == 202:
hash.update(src[131:192])
result = hash.digest()
if result == dest[107:127]:
return dest
return None
def validate_cert(cert, key):
buf = decrypt_block(cert[8:], key)
if buf is None:
return None
return buf[36:107] + cert[139:196]
def read_random():
try:
fd = open("/dev/urandom", "r")
buf = fd.read(8)
fd.close()
return buf
except:
return None
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