Reversing an algorithm

[Thekid]

Hi,
This code works fine but what I need is to reverse the algorithm somehow. Is there a simple solution to this? I would need to take numbers in the format as the printed out answer and have them reversed so the code would print out the answer in the format as the 'serial numbers' are in:

from hashlib import md5
evalCrossTotal = lambda strMD5: sum(map(lambda x: int(x, 16), strMD5))
def encryptString(strString, strPassword):
    # strString is the content of the entire file with serials
    strPasswordMD5 = md5(strPassword).hexdigest()
    intMD5Total = evalCrossTotal(strPasswordMD5)
    arrEncryptedValues = []
    for i in range(len(strString)):
        arrEncryptedValues.append(
            str(ord(strString[i]) + int(strPasswordMD5[i%32], 16) - intMD5Total)
        )
        intMD5Total = evalCrossTotal(
            md5(strString[0:i+1]).hexdigest()[0:16] +
            md5(str(intMD5Total)).hexdigest()[0:16]
        )
    return ' '.join(arrEncryptedValues)
# serial numbers
strString = """99Z-KH5-OEM-240-1.1
   QGG-V33-OEM-0B1-1.1
   Z93-Z29-OEM-BNX-1.1
   IQ0-PZI-OEM-PK0-1.1
   UM4-VDL-OEM-B9O-1.1
   L0S-4R2-OEM-UQL-1.1
   JBL-EYQ-OEM-ABB-1.1
   NL1-3V3-OEM-L4C-1.1
   7CQ-1ZR-OEM-U3I-1.1
   XX0-IHL-OEM-5XK-1.1
   KJQ-RXG-OEM-TW8-1.1
   OZR-LW1-OEM-5EM-1.1
   0B8-6K5-OEM-EFN-1.1
   OE2-20L-OEM-SSI-1.1
   0ME-HAE-OEM-9XB-1.1"""
print encryptString(strString, "strPassword")
 
 

Results(partial answer print out for the sake of space):

-195 -208 -172 -218 -143 -99 -164 -230 -185 -150 -137 -196 -188 -134 -195 -223 -212 -235 -185 -251 -249 -202 -226 -127 -163 -154 -203 -167 -216 -170 -162 -149 -139 -124 -172 -149 -184 -156 -159 -167 -138 -211 -227 -173 -171 -217 -124 -142 -218 -166 -181 -142 -205 -173 -124 -166 -156 -223 -123 -161 -134 -202 -200 -182 -
 

Instead, I would need to take numbers in the above format and have them print out in this format:

   99Z-KH5-OEM-240-1.1
   QGG-V33-OEM-0B1-1.1
   Z93-Z29-OEM-BNX-1.1
   IQ0-PZI-OEM-PK0-1.1
   UM4-VDL-OEM-B9O-1.1
   L0S-4R2-OEM-UQL-1.1
   JBL-EYQ-OEM-ABB-1.1
   NL1-3V3-OEM-L4C-1.1
   7CQ-1ZR-OEM-U3I-1.1
   XX0-IHL-OEM-5XK-1.1
   KJQ-RXG-OEM-TW8-1.1
   OZR-LW1-OEM-5EM-1.1
   0B8-6K5-OEM-EFN-1.1
   OE2-20L-OEM-SSI-1.1
   0ME-HAE-OEM-9XB-1.1"""
 

Any suggestions?

[Smygis]

I love you're excessive use of comments.

Yeah its super simple. md5 is a one way hash. You cant reverse it.

[Thekid]

I love you're excessive use of comments.

Yeah its super simple. md5 is a one way hash. You cant reverse it.

I'll be sure and give that as my answer. If you don't understand what I'm asking, please check with me and I will clarify it.

[pbmods]

Heya, TheKid.

Care to tell us why you want to crack this encryption algorithm?

[RedSon]

Is this question about how to make the ouput change? Or is it an encryption question?