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| import sys
def genMsgLengthDescriptor(msg_bitsLenth):
'''
---args:
msg_bitsLenth : the bits length of raw message
--return:
16 hex-encoded string , i.e.64bits,8bytes which used to describe the bits length of raw message added after padding
'''
return __import__("struct").pack(">Q",msg_bitsLenth).encode("hex")
def reverse_hex_8bytes(hex_str):
'''
--args:
hex_str: a hex-encoded string with length 16 , i.e.8bytes
--return:
transform raw message descriptor to little-endian
'''
hex_str = "%016x"%int(hex_str,16)
assert len(hex_str)==16
return __import__("struct").pack("<Q",int(hex_str,16)).encode("hex")
def reverse_hex_4bytes(hex_str):
'''
--args:
hex_str: a hex-encoded string with length 8 , i.e.4bytes
--return:
transform 4 bytes message block to little-endian
'''
hex_str = "%08x"%int(hex_str,16)
assert len(hex_str)==8
return __import__("struct").pack("<L",int(hex_str,16)).encode("hex")
def deal_rawInputMsg(input_msg):
'''
--args:
input_msg : inputed a ascii-encoded string
--return:
a hex-encoded string which can be inputed to mathematical transformation function.
'''
ascii_list = [x.encode("hex") for x in input_msg]
length_msg_bytes = len(ascii_list)
length_msg_bits = len(ascii_list)*8
ascii_list.append('80')
while (len(ascii_list)*8+64)%512 != 0:
ascii_list.append('00')
ascii_list.append(reverse_hex_8bytes(genMsgLengthDescriptor(length_msg_bits)))
return "".join(ascii_list)
def getM16(hex_str,operatingBlockNum):
'''
--args:
hex_str : a hex-encoded string with length in integral multiple of 512bits
operatingBlockNum : message block number which is being operated , greater than 1
--return:
M : result of splited 64bytes into 4*16 message blocks with little-endian
'''
M = [int(reverse_hex_4bytes(hex_str[i:(i+8)]),16) for i in xrange(128*(operatingBlockNum-1),128*operatingBlockNum,8)]
return M
def T(i):
result = (int(4294967296*abs(__import__("math").sin(i))))&0xffffffff
return result
F = lambda x,y,z:((x&y)|((~x)&z))
G = lambda x,y,z:((x&z)|(y&(~z)))
H = lambda x,y,z:(x^y^z)
I = lambda x,y,z:(y^(x|(~z)))
RL = L = lambda x,n:(((x<<n)|(x>>(32-n)))&(0xffffffff))
def FF(a, b, c, d, x, s, ac):
a = (a+F ((b), (c), (d)) + (x) + (ac)&0xffffffff)&0xffffffff;
a = RL ((a), (s))&0xffffffff;
a = (a+b)&0xffffffff
return a
def GG(a, b, c, d, x, s, ac):
a = (a+G ((b), (c), (d)) + (x) + (ac)&0xffffffff)&0xffffffff;
a = RL ((a), (s))&0xffffffff;
a = (a+b)&0xffffffff
return a
def HH(a, b, c, d, x, s, ac):
a = (a+H ((b), (c), (d)) + (x) + (ac)&0xffffffff)&0xffffffff;
a = RL ((a), (s))&0xffffffff;
a = (a+b)&0xffffffff
return a
def II(a, b, c, d, x, s, ac):
a = (a+I ((b), (c), (d)) + (x) + (ac)&0xffffffff)&0xffffffff;
a = RL ((a), (s))&0xffffffff;
a = (a+b)&0xffffffff
return a
def show_md5(A,B,C,D):
return "".join( [ "".join(__import__("re").findall(r"..","%08x"%i)[::-1]) for i in (A,B,C,D) ] )
def run_md5(A=0x67452301,B=0xefcdab89,C=0x98badcfe,D=0x10325476,readyMsg=""):
a = A
b = B
c = C
d = D
for i in xrange(0,len(readyMsg)/128):
M = getM16(readyMsg,i+1)
for i in xrange(16):
exec "M"+str(i)+"=M["+str(i)+"]"
a=FF(a,b,c,d,M0,7,0xd76aa478L)
d=FF(d,a,b,c,M1,12,0xe8c7b756L)
c=FF(c,d,a,b,M2,17,0x242070dbL)
b=FF(b,c,d,a,M3,22,0xc1bdceeeL)
a=FF(a,b,c,d,M4,7,0xf57c0fafL)
d=FF(d,a,b,c,M5,12,0x4787c62aL)
c=FF(c,d,a,b,M6,17,0xa8304613L)
b=FF(b,c,d,a,M7,22,0xfd469501L)
a=FF(a,b,c,d,M8,7,0x698098d8L)
d=FF(d,a,b,c,M9,12,0x8b44f7afL)
c=FF(c,d,a,b,M10,17,0xffff5bb1L)
b=FF(b,c,d,a,M11,22,0x895cd7beL)
a=FF(a,b,c,d,M12,7,0x6b901122L)
d=FF(d,a,b,c,M13,12,0xfd987193L)
c=FF(c,d,a,b,M14,17,0xa679438eL)
b=FF(b,c,d,a,M15,22,0x49b40821L)
a=GG(a,b,c,d,M1,5,0xf61e2562L)
d=GG(d,a,b,c,M6,9,0xc040b340L)
c=GG(c,d,a,b,M11,14,0x265e5a51L)
b=GG(b,c,d,a,M0,20,0xe9b6c7aaL)
a=GG(a,b,c,d,M5,5,0xd62f105dL)
d=GG(d,a,b,c,M10,9,0x02441453L)
c=GG(c,d,a,b,M15,14,0xd8a1e681L)
b=GG(b,c,d,a,M4,20,0xe7d3fbc8L)
a=GG(a,b,c,d,M9,5,0x21e1cde6L)
d=GG(d,a,b,c,M14,9,0xc33707d6L)
c=GG(c,d,a,b,M3,14,0xf4d50d87L)
b=GG(b,c,d,a,M8,20,0x455a14edL)
a=GG(a,b,c,d,M13,5,0xa9e3e905L)
d=GG(d,a,b,c,M2,9,0xfcefa3f8L)
c=GG(c,d,a,b,M7,14,0x676f02d9L)
b=GG(b,c,d,a,M12,20,0x8d2a4c8aL)
a=HH(a,b,c,d,M5,4,0xfffa3942L)
d=HH(d,a,b,c,M8,11,0x8771f681L)
c=HH(c,d,a,b,M11,16,0x6d9d6122L)
b=HH(b,c,d,a,M14,23,0xfde5380c)
a=HH(a,b,c,d,M1,4,0xa4beea44L)
d=HH(d,a,b,c,M4,11,0x4bdecfa9L)
c=HH(c,d,a,b,M7,16,0xf6bb4b60L)
b=HH(b,c,d,a,M10,23,0xbebfbc70L)
a=HH(a,b,c,d,M13,4,0x289b7ec6L)
d=HH(d,a,b,c,M0,11,0xeaa127faL)
c=HH(c,d,a,b,M3,16,0xd4ef3085L)
b=HH(b,c,d,a,M6,23,0x04881d05L)
a=HH(a,b,c,d,M9,4,0xd9d4d039L)
d=HH(d,a,b,c,M12,11,0xe6db99e5L)
c=HH(c,d,a,b,M15,16,0x1fa27cf8L)
b=HH(b,c,d,a,M2,23,0xc4ac5665L)
a=II(a,b,c,d,M0,6,0xf4292244L)
d=II(d,a,b,c,M7,10,0x432aff97L)
c=II(c,d,a,b,M14,15,0xab9423a7L)
b=II(b,c,d,a,M5,21,0xfc93a039L)
a=II(a,b,c,d,M12,6,0x655b59c3L)
d=II(d,a,b,c,M3,10,0x8f0ccc92L)
c=II(c,d,a,b,M10,15,0xffeff47dL)
b=II(b,c,d,a,M1,21,0x85845dd1L)
a=II(a,b,c,d,M8,6,0x6fa87e4fL)
d=II(d,a,b,c,M15,10,0xfe2ce6e0L)
c=II(c,d,a,b,M6,15,0xa3014314L)
b=II(b,c,d,a,M13,21,0x4e0811a1L)
a=II(a,b,c,d,M4,6,0xf7537e82L)
d=II(d,a,b,c,M11,10,0xbd3af235L)
c=II(c,d,a,b,M2,15,0x2ad7d2bbL)
b=II(b,c,d,a,M9,21,0xeb86d391L)
A += a
B += b
C += c
D += d
A = A&0xffffffff
B = B&0xffffffff
C = C&0xffffffff
D = D&0xffffffff
a = A
b = B
c = C
d = D
return show_md5(a,b,c,d)
|