def decrypt(username):
print "-------------------------------------------"
sql_command = "SELECT private_exp,modulus FROM main WHERE username LIKE '%s'" %username
cursor.execute(sql_command)
result = cursor.fetchall()
exp = int(result[0][0])
modulus = int(result[0][1])
infilename = raw_input("Enter name of file to be decrypted : ")
f = open(infilename, "r")
text = ""
for line in f.readlines() :
line = line.strip()
text = text + line + "\n"
m = Toolkit.decrypt(text,exp,modulus)
if not(len(m) >0) :
print "-------------------------------------------"
print "Authentication Failure, This file is not for you"
print "-------------------------------------------"
start_session(username)
else :
outfilename = raw_input("Enter name of file to store decrypted message : ")
f = open(outfilename, "w", 0)
f.write(m)
print "-------------------------------------------"
print "Done! Your Decrypted file is ready."
print "-------------------------------------------"
start_session(username)
def verify_signature(username) :
infilename = raw_input("Enter name of the file : ")
signature_filename = raw_input("Enter name of the signature file : ")
name = raw_input("Enter name of creator : ")
sql_command = "SELECT public_exp, modulus FROM main WHERE username like '%s'" %name
cursor.execute(sql_command)
result = cursor.fetchall()
exp = int(result[0][0])
modulus = int(result[0][1])
file_text = ""
f = open(infilename, "r")
for line in f.readlines():
file_text = file_text + line
file_fingerprint = Toolkit.get_fingerprint(file_text)
f = open(signature_filename, "r")
signature_file_text = ""
for line in f.readlines():
signature_file_text = signature_file_text + line
try :
decrypted_signature = Toolkit.decrypt(signature_file_text, exp, modulus)
except Exception :
print "-------------------------------------------"
print "Verification Failed"
print "-------------------------------------------"
start_session(username)
if decrypted_signature == file_fingerprint :
print "-------------------------------------------"
print "Verification Successful!"
print "-------------------------------------------"
start_session(username)
