How do I encrypt and decrypt a string in python

Question

I have been looking for sometime on how to encrypt and decrypt a string  But most of it is in 2 7 and anything that is using 3 2 is not letting me print it or add it to a string   So what I m trying to do is the following   mystring    Hello stackoverflow   encoded   encode mystring  password   print encoded       jgAKLJK34t3g  a bunch of random letters    decoded   decode encoded  password   print decoded       Hello stackoverflow    Is there anyway of doing this  using python 3 X and when the string is encoded it s still a string  not any other variable type

User · Answer

I had troubles compiling all the most commonly mentioned cryptography libraries on my Windows 7 system and for Python 3.5.

This is the solution that finally worked for me.

from cryptography.fernet import Fernet
key = Fernet.generate_key() #this is your "password"
cipher_suite = Fernet(key)
encoded_text = cipher_suite.encrypt(b"Hello stackoverflow!")
decoded_text = cipher_suite.decrypt(encoded_text)

User · Answer

Encrypt Data First  we need to install the cryptography library  pip3 install cryptography   From the cryptography library  we need to import Fernet and start generating a key - this key is required for symmetric encryption decryption   To generate a key  we call the generate key   method   We only need to execute the above method once to generate a key    You need to keep this key in a safe place  If you lose the key  you won t be able to decrypt the data that was encrypted with this key    Once we have generated a key  we need to load the key with load key     Encrypt a Message This is a three step process   encode the message initialize the Fernet class pass the encoded message to encrypt   method  Below is a full working example of encrypting a message   from cryptography fernet import Fernet  def generate key         quot  quot  quot      Generates a key and save it into a file      quot  quot  quot      key   Fernet generate key       with open  quot secret key quot    quot wb quot   as key file          key file write key   def load key         quot  quot  quot      Load the previously generated key      quot  quot  quot      return open  quot secret key quot    quot rb quot   read    def encrypt message message        quot  quot  quot      Encrypts a message      quot  quot  quot      key   load key       encoded message   message encode       f   Fernet key      encrypted message   f encrypt encoded message       print encrypted message   if   name       quot   main   quot         generate key     execute only once      encrypt message  quot Hello stackoverflow  quot    output  b gAAAAABgLX7Zj-kn-We2BI c9NQhEtfJEnHUVhVqtiqjkDi5dgJafj- 8QUDyeNS2zsJTdBWg6SntRJOjOM1U5mIxxsGny7IEGqpVVdHwheTnwzSBlgpb80    Decrypt Data To decrypt the message  we just call the decrypt   method from the Fernet library  Remember  we also need to load the key as well  because the key is needed to decrypt the message  from cryptography fernet import Fernet  def load key         quot  quot  quot      Load the previously generated key      quot  quot  quot      return open  quot secret key quot    quot rb quot   read    def decrypt message encrypted message        quot  quot  quot      Decrypts an encrypted message      quot  quot  quot      key   load key       f   Fernet key      decrypted message   f decrypt encrypted message       print decrypted message decode     if   name       quot   main   quot       decrypt message b gAAAAABgLX7Zj-kn-We2BI c9NQhEtfJEnHUVhVqtiqjkDi5dgJafj- 8QUDyeNS2zsJTdBWg6SntRJOjOM1U5mIxxsGny7IEGqpVVdHwheTnwzSBlgpb80     output  Hello stackoverflow     Your password is in the secret key in a form similar to the password below  B8wtXqwBA zb2Iaz5pW8CIQIwGSYSFoBiLsVz-vTqzw

User · Answer

You may use Fernet as follows   from cryptography fernet import Fernet key   Fernet generate key   f   Fernet key  encrypt value   f encrypt b YourString   f decrypt encrypt value

User · Answer

You can do this easily by using the library cryptocode  Here is how you install  pip install cryptocode  Encrypting a message  example code   import cryptocode  encoded   cryptocode encrypt  quot mystring quot   quot mypassword quot      And then to decode it  decoded   cryptocode decrypt encoded   quot mypassword quot    Documentation can be found here

User · Answer

Try this   Python Cryptography Toolkit  pycrypto  is required    pip install pycrypto   Code   from Crypto Cipher import AES from base64 import b64encode  b64decode   class Crypt       def   init   self  salt  SlTKeYOpHygTYkP3            self salt   salt encode  utf8           self enc dec method    utf-8       def encrypt self  str to enc  str key           try              aes obj   AES new str key  AES MODE CFB  self salt              hx enc   aes obj encrypt str to enc encode  utf8                mret   b64encode hx enc  decode self enc dec method              return mret         except ValueError as value error              if value error args 0      IV must be 16 bytes long                   raise ValueError  Encryption Error  SALT must be 16 characters long               elif value error args 0      AES key must be either 16  24  or 32 bytes long                   raise ValueError  Encryption Error  Encryption key must be either 16  24  or 32 characters long               else                  raise ValueError value error       def decrypt self  enc str  str key           try              aes obj   AES new str key encode  utf8    AES MODE CFB  self salt              str tmp   b64decode enc str encode self enc dec method               str dec   aes obj decrypt str tmp              mret   str dec decode self enc dec method              return mret         except ValueError as value error              if value error args 0      IV must be 16 bytes long                   raise ValueError  Decryption Error  SALT must be 16 characters long               elif value error args 0      AES key must be either 16  24  or 32 bytes long                   raise ValueError  Decryption Error  Encryption key must be either 16  24  or 32 characters long               else                  raise ValueError value error    Usage           test crpt   Crypt           test text      Lorem ipsum dolor sit amet  consectetur adipisicing elit  sed do eiusmod tempor incididunt ut labore et dolore magna aliqua  Ut enim ad minim veniam  quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur  Excepteur sint occaecat cupidatat non proident  sunt in culpa qui officia deserunt mollit anim id est laborum  Lorem ipsum dolor sit amet  consectetur adipisicing elit  sed do eiusmod tempor incididunt ut labore et dolore magna aliqua  Ut enim ad minim veniam  quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur  Excepteur sint occaecat cupidatat non proident  sunt in culpa qui officia deserunt mollit anim id est laborum  Lorem ipsum dolor sit amet  consectetur adipisicing elit  sed do eiusmod tempor incididunt ut labore et dolore magna aliqua  Ut enim ad minim veniam  quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat  Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur  Excepteur sint occaecat cupidatat non proident  sunt in culpa qui officia deserunt mollit anim id est laborum              test key    MyKey4TestingYnP          test enc text   test crpt encrypt test text  test key          test dec text   test crpt decrypt test enc text  test key          print f Encrypted  test enc text   Decrypted  test dec text

User · Answer

For Decryption        def decrypt my key KEY  my iv IV  encryptText encrypttext            key   binascii unhexlify my key          iv   binascii unhexlify my iv          encryptor   AES new key  AES MODE CBC  iv  segment size 128     Initialize encryptor         result   encryptor decrypt binascii a2b hex encryptText           padder   PKCS7Padder           decryptText padder decode result                return              plain   encryptText             key   binascii hexlify key              iv   binascii hexlify iv              decryptedTest   decryptText

User · Answer

Although its very old  but I thought of sharing another idea to do this  from Crypto Cipher import AES     from Crypto Hash import SHA256  password     quot anything quot       hash obj   SHA256 new password encode  utf-8        hkey   hash obj digest    def encrypt info       msg   info     BLOCK SIZE   16     PAD    quot   quot      padding   lambda s  s    BLOCK SIZE - len s    BLOCK SIZE    PAD     cipher   AES new hkey  AES MODE ECB      result   cipher encrypt padding msg  encode  utf-8        return result    msg    quot Hello stackoverflow  quot  cipher text   encrypt msg  print cipher text   def decrypt info       msg   info     PAD    quot   quot      decipher   AES new hkey  AES MODE ECB      pt   decipher decrypt msg  decode  utf-8       pad index   pt find PAD      result   pt   pad index      return result  plaintext   decrypt cipher text  print plaintext   Outputs   gt  b  xcb x0b x8c xdc  n xdd x80 xa6  xacu x1dEg  x8e xa2 xaf x80 xea x95 x80 x02 x13 x1aem xcb xf40 xdb    gt  Hello stackoverflow

User · Answer

For Encryption    def encrypt my key KEY  my iv IV  my plain text PLAIN TEXT            key   binascii unhexlify  ce975de9294067470d1684442555767fcb007c5a3b89927714e449c3f66cb2a4          iv   binascii unhexlify  9aaecfcf7e82abb8118d8e567d42ee86           padder   PKCS7Padder          padded text   padder encode my plain text         encryptor   AES new key  AES MODE CBC  iv  segment size 128     Initialize encryptor       result   encryptor encrypt padded text          return             plain   my plain text            key   binascii hexlify key             iv   binascii hexlify iv             ciphertext   result

User · Answer

Take a look at PyCrypto  It supports Python 3 2 and does exactly what you want   From their pip website    gt  gt  gt  from Crypto Cipher import AES  gt  gt  gt  obj   AES new  This is a key123   AES MODE CFB   This is an IV456    gt  gt  gt  message    The answer is no   gt  gt  gt  ciphertext   obj encrypt message   gt  gt  gt  ciphertext   xd6 x83 x8dd VT x92 xaa A x05 xe0 x9b x8b xf1   gt  gt  gt  obj2   AES new  This is a key123   AES MODE CFB   This is an IV456    gt  gt  gt  obj2 decrypt ciphertext   The answer is no    If you want to encrypt a message of an arbitrary size use AES MODE CFB instead of AES MODE CBC

[python] How do I encrypt and decrypt a string in python?

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