def decryptString(ciphertext, key):
"""
Takes in a string and a key, decrypts with blowfish, and returns the plaintext string
TODO: Add different modes of operation (CBC, etc.)
"""
blowfish.genSubkeys(key)
ct = ciphertext
textGroups = []
while(ct != ""):
textGroups.append(ct[:8])
ct = ct[8:]
plaintext = ""
# ECB mode
for t in textGroups:
l, r = blowfish.strToInt(t[:4]), blowfish.strToInt(t[4:])
l, r = blowfish.encrypt(l, r)
l, r = blowfish.intToString(l), blowfish.intToString(r)
plaintext += l + r
return plaintext
def encryptString(plaintext, key):
"""
Takes in a string and a key, encrypts with blowfish, and returns the ciphertext string
TODO: Add different modes of operation (CBC, etc.)
"""
blowfish.genSubkeys(key)
# pad the plaintext
pt = plaintext + ((8 - (len(plaintext) % 8)) * chr(0))
print pt
textGroups = []
while(pt != ""):
textGroups.append(pt[:8])
pt = pt[8:]
ciphertext = ""
# ECB mode
for t in textGroups:
l, r = blowfish.strToInt(t[:4]), blowfish.strToInt(t[4:])
l, r = blowfish.encrypt(l, r)
l, r = blowfish.intToString(l), blowfish.intToString(r)
ciphertext += l + r
return ciphertext
