インストール方法1 (READMEファイルに書いてある)
  1. PyCryptoからファイルをダウンロードし展開する
  2. 展開したディレクトリに移動する
    $ cd /home/yoshi/download/pycrypto-2.0.1
  3. ビルドする
    $ python setup.py build
  4. インストールする
    $ sudo python setup.py install
  5. 動くかテストする
    $ python test.py
$ sudo apt-get install python-crypto

# -*- coding: utf-8 -*-

import Crypto.Cipher.AES

# キーは16, 24, 32バイトの長さでなければならない
obj = Crypto.Cipher.AES.new('This is a key456', Crypto.Cipher.AES.MODE_ECB)
message = "The answer is no"  # 文字数は16の倍数でなければならない
ciphertext = obj.encrypt(message)
obj2 = Crypto.Cipher.AES.new('This is a key456', Crypto.Cipher.AES.MODE_ECB)
decrypt = obj2.decrypt(ciphertext)
print "message:", message
print "encrypt:", ciphertext
print "decrypt:", decrypt

import Crypto.Cipher.DES

# "abcdefgh" がキーになる(キーは8バイトの長さでなければならない)
obj = Crypto.Cipher.DES.new("abcdefgh", Crypto.Cipher.DES.MODE_ECB)
plain = "Guido van Rossum is a space alien."
# 文字数は8の倍数でなければエラーになるのでplainに6文字結合する
ciph = obj.encrypt(plain + "XXXXXX")
decrypt = obj.decrypt(ciph)
print "plain  :", plain
print "encrypt:", ciph
print "decrypt:", decrypt

message: The answer is no
encrypt: oq_{P+�Ή�=M�9
decrypt: The answer is no
plain  : Guido van Rossum is a space alien.
encrypt: ,�Nq�DY�T�pA���s��,�jب���I�5w61�dgb/
decrypt: Guido van Rossum is a space alien.XXXXXX

# -*- coding: utf-8 -*-

import Crypto.PublicKey.RSA
import Crypto.Util.randpool

pool = Crypto.Util.randpool.RandomPool()

# RSAオブジェクトをランダムな鍵で生成する
# 40bit(5文字)までを暗号化できるようにする
rsa = Crypto.PublicKey.RSA.generate(40, pool.get_bytes)

# 公開鍵を取得する
pub_rsa = rsa.publickey()

# RSAオブジェクトをタプルから生成する
# rsa.nが公開鍵、rsa.dが秘密鍵と思う
priv_rsa = Crypto.PublicKey.RSA.construct((rsa.n, rsa.e, rsa.d))

# 暗号化する
enc = pub_rsa.encrypt("hello", "")

# 復号する
dec = priv_rsa.decrypt(enc)

print "private: n=%d, e=%d, d=%d, p=%d, q=%d, u=%d" % \
      (rsa.n, rsa.e, rsa.d, rsa.p, rsa.q, rsa.u)
print "public: n=%d, e=%d" % (pub_rsa.n, pub_rsa.e)
print "encrypt:", enc
print "decrypt:", dec

# 署名する
text = "hello"
signature = priv_rsa.sign(text, "")
# 文字列が変わってないか調べる
print pub_rsa.verify(text, signature)
print pub_rsa.verify(text+"a", signature)

private: n=593139068983, e=65537, d=308700828273, p=593951, q=998633, u=854285
public: n=593139068983, e=65537
encrypt: ('\x82A\x85\x0bv',)
decrypt: hello

General overview of PyCrypto

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