11

我在 openssl 中创建了私钥/公钥，并签署了一些数据：

openssl genrsa -out private.pem 1024
openssl rsa -in private.pem -out public.pem -outform PEM -pubout
echo 'data to sign' > data.txt
openssl dgst -md5 < data.txt > hash
openssl rsautl -sign -inkey private.pem -keyform PEM -in hash  > signature

现在在 python 中，我正在尝试验证这些数据：

pubKey = open('public.pem').read()
data = open('data.txt').read()
signature = open('signature').read()

from Crypto import PublicKey
key = PublicKey.RSA.importKey(pubKey)
pub = key.publickey()
hash = MD5.new(data).hexdigest()
# here, hash is same, as contents of 'hash' file
print pub.verify(hash, signature) # <-- here

问题是，它pub.verify期望第二个参数是具有较大数字的单元素列表。而且我不知道如何将文件中的二进制数据转换signature为这个整数。每个关于 pycrypto 的示例都显示了从pycrypto 生成的签名，并key.sign()以 form 生成正确的签名(1832273432...2340234L, )。但我不知道如何使用外部签名。

如果有必要，以下是附加信息，我不知道如何解释：

简要技术资料：

  • 数字签名格式：PKCS#7 “Signed-Data”</li>
  • 公钥程序：DSS
  • 密钥长度：512 – 1024 位
  • 公共指数：2 +1
  • 公钥格式：X.509 v3 证书
  • MD（消息摘要）算法：MD5 或 RIPEMD-160 16
4

4 回答 4

8

Crypto.Signature模块是您想要的。从Crypto.Signature.PKCS1_v1_5文档中：

key = RSA.importKey(open('pubkey.der').read())
h = SHA.new(message)
verifier = PKCS1_v1_5.new(key)
if verifier.verify(h, signature):
   print "The signature is authentic."
else:
   print "The signature is not authentic."
于 2012-05-13T07:10:34.200 回答
8

我遇到了同样的问题，这里有两个示例，使用 openssl 和 python 生成和验证。希望这可以帮助某人...

重击：

#!/bin/bash
# Generate keys
openssl genrsa -out priv.pem
# Export public key
openssl rsa -pubout -in priv.pem -out pub.pem
# Create test file
echo test123 > test.txt
# Create SHA1 signature
openssl dgst -sha1 -sign priv.pem -out test.txt.sig test.txt
# Verify SHA1 signature
openssl dgst -sha1 -verify pub.pem -signature test.txt.sig test.txt

Python：

#!/usr/bin/python
from Crypto.Signature import PKCS1_v1_5
from Crypto.PublicKey import RSA
from Crypto.Hash import SHA
from Crypto import Random
# Read public key from file
fd = open('pub.pem', 'r')
key_data = fd.read()
fd.close()
# Load public key
key = RSA.importKey(key_data)
# Read test file
fd = open('test.txt', 'r')
message = fd.read()
fd.close()
# Create SHA1 hash object
h = SHA.new(message)
# Create PKCS1 handler
cipher = PKCS1_v1_5.new(key)
# Read signature file
fd = open('test.txt.sig', 'r')
signature = fd.read()
fd.close()
# Verify signature
print cipher.verify(h, signature)
# Read private key from file
fd = open('priv.pem', 'r')
priv_key_data = fd.read()
fd.close()
# Load private key
priv_key = RSA.importKey(priv_key_data)
# Create PKCS1 handler
priv_cipher = PKCS1_v1_5.new(priv_key)
# Sign hash of test file content and compare
signature2 = priv_cipher.sign(h)
if signature == signature2:
    print "Match!! :)"

经过更多阅读后，我了解到 ( https://en.wikipedia.org/wiki/PKCS_1 ) PKCS1_PSS 是应该用于创建签名的新方案。

这两个脚本都需要一些更改：

重击：

#!/bin/bash
# Generate keys
openssl genrsa -out priv.pem
# Export public key
openssl rsa -pubout -in priv.pem -out pub.pem
# Create test file
echo test123 > test.txt
# Create SHA1 signature
openssl dgst -sha1 -sigopt rsa_padding_mode:pss -sigopt rsa_pss_saltlen:-1 -sign priv.pem -out test.txt.sig test.txt
# Verify SHA1 signature
openssl dgst -sha1 -sigopt rsa_padding_mode:pss -sigopt rsa_pss_saltlen:-1 -verify pub.pem -signature test.txt.sig test.txt

Python：

#!/usr/bin/python
from Crypto.Signature import PKCS1_PSS
from Crypto.PublicKey import RSA
from Crypto.Hash import SHA
from Crypto import Random
# Read public key from file
fd = open('pub.pem', 'r')
key_data = fd.read()
fd.close()
# Load public key
key = RSA.importKey(key_data)
# Read test file
fd = open('test.txt', 'r')
message = fd.read()
fd.close()
# Create SHA1 hash object
h = SHA.new(message)
# Create PKCS1 handler
cipher = PKCS1_PSS.new(key)
# Read signature file
fd = open('test.txt.sig', 'r')
signature = fd.read()
fd.close()
# Verify signature
print cipher.verify(h, signature)
# Read private key from file
fd = open('priv.pem', 'r')
priv_key_data = fd.read()
fd.close()
# Load private key
priv_key = RSA.importKey(priv_key_data)
# Create PKCS1 handler
priv_cipher = PKCS1_PSS.new(priv_key)
# Sign hash of test file content and compare
signature2 = priv_cipher.sign(h)
# PKCS1_PSS signatures always differ!
#if signature == signature2:
#    print "Match!! :)"
于 2015-10-01T20:33:00.580 回答
0

这是解决方案。

from Crypto.Util import number
signature  = number.bytes_to_long(signature) #Convert the signature to long
print pub.verify(hash, (signature,) ) #Pass tuple to verify
于 2011-08-26T09:00:33.353 回答
-1

这篇文章给你最好的答案。 如何在 Python 中验证 RSA SHA1 签名？

pycrypto 无法验证 OpenSSL 创建的签名。你可以试试 M2Crypto。

于 2011-07-12T05:48:33.903 回答