在Ruby / Rails中，如何解密由PKCS7加密和签名的字符串

问题描述

在中，它向您显示如何在发送之前加密URL参数它到PayPal。

  PAYPAL_CERT_PEM = File.read（＃{Rails.root} /certs/paypal_cert.pem）
 APP_CERT_PEM = File.read（＃{Rails.root} /certs/app_cert.pem）
 APP_KEY_PEM = File.read（＃{Rails.root} /certs/app_key.pem）
 def encrypt_for_paypal（values）
 signed = OpenSSL :: PKCS7 :: sign（OpenSSL :: X509 :: Certificate.new（APP_CERT_PEM），OpenSSL :: PKey :: RSA.new（APP_KEY_PEM，''），values.map {| k，v |＃{k} =＃{v}} .join（\\\
），[]，OpenSSL :: PKCS7 :: BINARY）
 OpenSSL :: PKCS7 :: encrypt （[OpenSSL :: X509 :: Certificate.new（PAYPAL_CERT_PEM）]，signed.to_der，OpenSSL :: Cipher :: Cipher :: new（DES3），OpenSSL :: PKCS7 :: BINARY）.to_s.gsub（ \\\
，）
 end 
  

假设我正在为PayPal编写代码服务器。我该如何解密这个字符串？在我看来，这段代码都是公钥标记字符串（以验证真实性），然后加密字符串（提供隐私）。

谢谢。

解决方案约翰，这里是使用ruby openssl加密/解密的例子。
注意它使用AES作为密码，因为DES3似乎被丢弃在我的ruby openssl版本中。
在字符串中调用gsub来替换换行符似乎打破了它，所以我已经把它留下了。
希望它帮助你。

  require'openssl'
 
 PAYPAL_CERT_PEM = File。 read（paypal_cert.pem）
 @paypal_cert = OpenSSL :: X509 :: Certificate.new（PAYPAL_CERT_PEM）
 
 APP_CERT_PEM = File.read（app_cert.pem）
 @app_cert = OpenSSL :: X509 :: Certificate.new（APP_CERT_PEM）
 
 APP_KEY_PEM = File.read（app_key.pem）
 @app_key = OpenSSL :: PKey :: RSA .new（APP_KEY_PEM，''）
 
 PAYPAL_KEY_PEM = File.read（paypal_key.pem）
 @paypal_key = OpenSSL :: PKey :: RSA.new（PAYPAL_KEY_PEM，''） 
 
 CERT_STORE = OpenSSL :: X509 :: Store.new 
 CERT_STORE.add_cert（@app_cert）
 
 data = Hash.new 
 data [' customer_id'] ='123456789'
 data ['customer_name'] ='史密斯先生'
 
 def encrypt_for_paypal（values）
 data_name_values = values.map {| k，v | ＃{k} =＃{v}} 
 
 signed_data = OpenSSL :: PKCS7 :: sign（@app_cert，@app_key，data_name_values.join（\\\
），[] OpenSSL :: PKCS7 :: BINARY）
 
 cypher = OpenSSL :: Cipher :: new（AES-128-CFB）
 
 encrypted_data = OpenSSL :: PKCS7 ::加密（[@ paypal_cert]，signed_data.to_der，cypher，OpenSSL :: PKCS7 :: BINARY）
 
 encrypted_data.to_s＃.gsub（\\\
，）
 end 
 
 def decrypt_by_paypal（encrypted_data）
 received_encrypted_data = OpenSSL :: PKCS7.new（encrypted_data）
 
 received_signed_data = received_encrypted_data.decrypt（@paypal_key，@paypal_cert）
 
 p7_received_signed_data = OpenSSL :: PKCS7.new（received_signed_data）
 
 p7_received_signed_data.verify（nil，CERT_STORE，nil，OpenSSL :: PKCS7 :: NOVERIFY）
 
 p7_received_signed_data.data 
 end 
 
 encrypted_txt = encrypt_for_paypal data 
 puts decrypt_by_paypal encrypted_txt 
  

In this RailsCast on PayPal it shows you how to encrypt a URL parameter before sending it to PayPal.

PAYPAL_CERT_PEM = File.read("#{Rails.root}/certs/paypal_cert.pem")
APP_CERT_PEM = File.read("#{Rails.root}/certs/app_cert.pem")
APP_KEY_PEM = File.read("#{Rails.root}/certs/app_key.pem")
def encrypt_for_paypal(values)
    signed = OpenSSL::PKCS7::sign(OpenSSL::X509::Certificate.new(APP_CERT_PEM),        OpenSSL::PKey::RSA.new(APP_KEY_PEM, ''), values.map { |k, v| "#{k}=#{v}" }.join("\n"), [], OpenSSL::PKCS7::BINARY)
    OpenSSL::PKCS7::encrypt([OpenSSL::X509::Certificate.new(PAYPAL_CERT_PEM)], signed.to_der, OpenSSL::Cipher::Cipher::new("DES3"),        OpenSSL::PKCS7::BINARY).to_s.gsub("\n", "")
end

Suppose I was writing the code for PayPal's server. How would I decrypt this string? It appears to me that this code both public-key signs the string (to verify authenticity) and then encrypts the string (to provide privacy). What would the code be for doing the reverse, decrypting and verifying authenticity?

Thanks.

解决方案

Hi John here is an example of encryption / decryption using ruby openssl.Note its using AES for the cypher as DES3 seemed to be dropped in my version of ruby openssl.Calling gsub on the string to replace newlines seemed to break it so i have left it commented out.Hope it helps you out.

require 'openssl'

PAYPAL_CERT_PEM = File.read("paypal_cert.pem")
@paypal_cert = OpenSSL::X509::Certificate.new(PAYPAL_CERT_PEM)

APP_CERT_PEM = File.read("app_cert.pem")
@app_cert = OpenSSL::X509::Certificate.new(APP_CERT_PEM)

APP_KEY_PEM = File.read("app_key.pem")
@app_key = OpenSSL::PKey::RSA.new(APP_KEY_PEM, '')

PAYPAL_KEY_PEM = File.read("paypal_key.pem")
@paypal_key = OpenSSL::PKey::RSA.new(PAYPAL_KEY_PEM, '')

CERT_STORE = OpenSSL::X509::Store.new
CERT_STORE.add_cert(@app_cert)

data = Hash.new
data['customer_id'] = '123456789'
data['customer_name'] = 'Mr Smith'

def encrypt_for_paypal(values)
data_name_values = values.map { |k, v| "#{k}=#{v}" }

signed_data = OpenSSL::PKCS7::sign(@app_cert, @app_key, data_name_values.join("\n"), [], OpenSSL::PKCS7::BINARY)

cypher = OpenSSL::Cipher::new("AES-128-CFB")

encrypted_data = OpenSSL::PKCS7::encrypt([@paypal_cert], signed_data.to_der, cypher, OpenSSL::PKCS7::BINARY)

encrypted_data.to_s #.gsub("\n", "")
end

def decrypt_by_paypal(encrypted_data)
received_encrypted_data = OpenSSL::PKCS7.new(encrypted_data)

received_signed_data = received_encrypted_data.decrypt(@paypal_key, @paypal_cert)

p7_received_signed_data = OpenSSL::PKCS7.new(received_signed_data)

p7_received_signed_data.verify(nil, CERT_STORE, nil, OpenSSL::PKCS7::NOVERIFY)

p7_received_signed_data.data
end

encrypted_txt = encrypt_for_paypal data
puts decrypt_by_paypal encrypted_txt

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