标签: pycrypto

我试图用Python 2.7.3 在Ubuntu 10.04(Lucid Lynx)上安装pycrypto2.6 .

我遇到以下错误:

running build
running build_py
running build_ext
running build_configure
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/home/pratibha/Desktop/pycrypto-2.6':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details
Traceback (most recent call last):
File "setup.py", line 456, in <module>
core.setup(**kw)
File "/usr/local/lib/python2.7/distutils/core.py", line 152, in setup
dist.run_commands()
File "/usr/local/lib/python2.7/distutils/dist.py", line 953, in run_commands
self.run_command(cmd)
File "/usr/local/lib/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run() …

我有一个自定义的EncryptedCharField,我希望在连接UI时基本上显示为CharField,但在数据库中存储/检索之前,它会加密/解密它.

该自定义字段的文件说要:

1. 加 __metaclass__ = models.SubfieldBase
2. 覆盖to_python以将数据从其原始存储转换为所需的格式
3. 覆盖get_prep_value以在存储db之前转换该值.

因此,您认为这很容易 - 只需要解密该值,然后再加密它.

松散地基于django片段,该字段的文档如下:

class EncryptedCharField(models.CharField):
  """Just like a char field, but encrypts the value before it enters the database, and    decrypts it when it
  retrieves it"""
  __metaclass__ = models.SubfieldBase
  def __init__(self, *args, **kwargs):
    super(EncryptedCharField, self).__init__(*args, **kwargs)
    cipher_type = kwargs.pop('cipher', 'AES')
    self.encryptor = Encryptor(cipher_type)

  def get_prep_value(self, value):
     return encrypt_if_not_encrypted(value, self.encryptor)

  def to_python(self, value):
    return decrypt_if_not_decrypted(value, self.encryptor)


def encrypt_if_not_encrypted(value, encryptor):
  if isinstance(value, EncryptedString):
    return value
  else:
    encrypted = encryptor.encrypt(value) …

我已经将pycrypto(版本2.3)安装到/usr/local/lib/python2.6/dist-packages/Crypto/,我可以在那里看到Random包.

但是当我尝试导入Crypto.Random时,它让我大吃一惊

from Crypto.Random import *
ImportError: No module named Random

有谁知道为什么会发生这种情况？谢谢.

import Crypto
import os
print(Crypto.__file__);
print (dir(Crypto));
print(os.listdir(os.path.dirname(Crypto.__file__)))

结果:

/usr/lib/python2.6/dist-packages/Crypto/__init__.pyc
['__all__', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__', '__revision__', '__version__']
['Hash', 'Protocol', 'PublicKey', 'test.py', 'Util', 'test.pyc', '__init__.pyc', '__init__.py', 'Cipher']

我打算在项目中使用PyCrypto,我想知道PyCrypto是否安全可靠,可以使用.如何根据各种加密算法(如RSA和AES)确保PyCrypto正确加密数据？

我试图弄清楚为什么我的Python客户端和Ruby服务器对如何加密数据存在分歧.我在Ruby代码和我的代码中看到的唯一区别是它们没有指定初始化向量,因此它回退到所有\ x0的默认值

当我尝试在没有iv的情况下实例化PyCrypto时它会给我一个错误.这是一个例子:

from Crypto.Cipher import AES
test = "Very, very confidential data"
key = b'Thirty Two Byte key, made Beef y' 

gryp = AES.new(key, AES.MODE_CBC)

(这个例子基本上是来自PyCrypto文档的示例代码而没有指定IV)文档说w/r/t IV"它是可选的,当它不存在时,它将被赋予全零的默认值." 但是我得到错误"ValueError:IV必须是16个字节长".

所以我可以指定IV,这不是问题,但我想弄清楚,如果它认为它不能使用默认值,如果我使用库的方式有其他错误.

我试图从Python 2.7.10 64位Windows版本的源代码编译pycrypto-2.6.1并面临以下错误.

Processing pycrypto-2.6.1.tar.gz
Writing c:\users\sivasuba\appdata\local\temp\easy_install-ecznz_\pycrypto-2.6.1\setup.cfg
Running pycrypto-2.6.1\setup.py -q bdist_egg --dist-dir c:\users\sivasuba\appdata\local\temp\easy_install-ecznz_\pycrypto-2.6.1\egg-dist-tmp-us3gka
warning: GMP or MPIR library not found; Not building Crypto.PublicKey._fastmath.
winrand.c
LINK : fatal error LNK1104: cannot open file 'python27.lib'
error: Setup script exited with error: command 'C:\\Users\\sivasuba\\AppData\\Local\\Programs\\Common\\Microsoft\\Visual C++ for Python\\9.0\\VC\\Bin\\amd64\\link.exe' failed with exit status 1104

谷歌搜索没有多大帮助.任何有关这方面的帮助将不胜感激.

PS我不是在寻找预先编译的二进制文件.要求是从源代码构建它.

可能重复:
未找到PyCrypto和GMP库错误[Mac OS 10.6.3]

我正在尝试在ubuntu上安装pycrypto,但它会抛出错误

hom@PC71:~/Desktop/pycrypto-2.3$ sudo python setup.py build
running build
running build_py
running build_ext
warning: GMP library not found; Not building Crypto.PublicKey._fastmath.
building 'Crypto.Hash.MD2' extension
gcc -pthread -fno-strict-aliasing -fwrapv -Wall -Wstrict-prototypes -fPIC -std=c99 -O3 -fomit-frame-pointer -Isrc/ -I/usr/include/python2.6 -c src/MD2.c -o build/temp.linux-i686-2.6/src/MD2.o
src/MD2.c:31: fatal error: Python.h: No such file or directory
compilation terminated.
error: command 'gcc' failed with exit status 1

我已经安装了python-dev工具.

我试图了解PyCrypto如何在项目中使用,但我还没有完全理解初始化向量(IV)的重要性.我发现在解码字符串时我可以使用错误的IV,除了前16个字节(块大小)之外我似乎仍然收到消息.我只是错误地使用它或不理解某些东西？

这是一个示例代码,用于演示:

import Crypto
import Crypto.Random
from Crypto.Cipher import AES

def pad_data(data):
    if len(data) % 16 == 0:
        return data
    databytes = bytearray(data)
    padding_required = 15 - (len(databytes) % 16)
    databytes.extend(b'\x80')
    databytes.extend(b'\x00' * padding_required)
    return bytes(databytes)

def unpad_data(data):
    if not data:
        return data

    data = data.rstrip(b'\x00')
    if data[-1] == 128: # b'\x80'[0]:
        return data[:-1]
    else:
        return data


def generate_aes_key():
    rnd = Crypto.Random.OSRNG.posix.new().read(AES.block_size)
    return rnd

def encrypt(key, iv, data):
    aes = AES.new(key, AES.MODE_CBC, iv)
    data = pad_data(data)
    return aes.encrypt(data)

def decrypt(key, …

我正在创建执行不同任务的各种流程.其中一个,只有其中一个,有一个安全模块,可以创建PyCrypto对象.所以我的程序启动,创建各种进程,处理消息的进程使用安全模块解密,我得到以下错误:

   firstSymKeybin = self.cipher.decrypt(encFirstSymKeybin, '')
  File "/usr/local/lib/python2.7/dist-packages/Crypto/Cipher/PKCS1_v1_5.py", line 206, in decrypt
    m = self._key.decrypt(ct)
  File "/usr/local/lib/python2.7/dist-packages/Crypto/PublicKey/RSA.py", line 174, in decrypt
    return pubkey.pubkey.decrypt(self, ciphertext)
  File "/usr/local/lib/python2.7/dist-packages/Crypto/PublicKey/pubkey.py", line 93, in decrypt
    plaintext=self._decrypt(ciphertext)
  File "/usr/local/lib/python2.7/dist-packages/Crypto/PublicKey/RSA.py", line 235, in _decrypt
    r = getRandomRange(1, self.key.n-1, randfunc=self._randfunc)
  File "/usr/local/lib/python2.7/dist-packages/Crypto/Util/number.py", line 123, in getRandomRange
    value = getRandomInteger(bits, randfunc)
  File "/usr/local/lib/python2.7/dist-packages/Crypto/Util/number.py", line 104, in getRandomInteger
    S = randfunc(N>>3)
  File "/usr/local/lib/python2.7/dist-packages/Crypto/Random/_UserFriendlyRNG.py", line 187, in read
    return self._singleton.read(bytes)
  File "/usr/local/lib/python2.7/dist-packages/Crypto/Random/_UserFriendlyRNG.py", line 163, in read
    return _UserFriendlyRNG.read(self, bytes)
  File "/usr/local/lib/python2.7/dist-packages/Crypto/Random/_UserFriendlyRNG.py", line …

我用pycrypto生成了一个公钥和私钥,然后使用export key将它们保存到一个文件中:

from Crypto.PublicKey import RSA
bits=2048
new_key = RSA.generate(bits, e=65537)

prv = open('keymac.pem','w')
prv.write(new_key.exportKey('PEM'))
prv.close()
pub = open('pubmac.pem', 'w')
pub.write(new_key.publickey().exportKey('PEM'))
pub.close()

我使用公钥加密文件(参见http://insiderattack.blogspot.com/2014/07/encrypted-file-transfer-utility-in.html#comment-form)

当我读取文件解密时,我得到"密文不正确".

我在Deepal Jayasekara示例的解密代码周围添加了一个try-except块:

try:
    encryptedonetimekey = filetodecrypt.read(512)
    privatekey = open("keymac.pem", 'r').read()
    rsaofprivatekey = RSA.importKey(privatekey)
    pkcs1ofprivatekey = PKCS1_OAEP.new(rsaofprivatekey)
    aesonetimekey = pkcs1ofprivatekey.decrypt(encryptedonetimekey)

   except Exception as decrypprivkeyerr:
       print "Decryption of the one time key using the private key        failed!!"
       print "Key error == %s" %decrypprivkeyerr
     raise Exception("Decryption using Private key failed error = %s" %decrypprivkeyerr)

我错过了什么吗？我应该以不同方式保存私钥吗？我没有正确读取私钥吗？