#RSA公钥加密，加签；des 不同加密算法的加密解密方法

require 'base64'
require 'digest'

#一 rsa加签 base64编码
  def rsa_sign data, key
  rkey =OpenSSL::PKey::RSA.new key
  sign= rkey.sign('sha1',data)
  signature = Base64.encode64(sign)
  signature.gsub!("\n",'')
 end

  #二 rsa加密 并编码

def rsa_encrypt(public_key,data)
  rsa= OpenSSL::PKey::RSA.new(Base64.decode64(public_key))   #是否需要decode依赖传的数据
  #rsa=OpenSSL::Pkey::RSA.new(File.read('./public_key.pem'))
  rsa_data = rsa.public_encrypt(data)
  result =Base64.encode64(rsa_data)
  result.gsub!("\n",'')
end

#HSA加密方法整理
def digest_sha?(data,type)
  case type
    when 1
      Digest::SHA1.hexdigest(data)
    when 256
      Digest::SHA256.hexdigest(data)
    when 384
      Digest::SHA384.hexdigest(data)
    when 512
      Digest::SHA512.hexdigest(data)
  end
end

ALG='DES-EDE3'   # OpenSSL::Cipher::Cipher.ciphers : 可以获取ruby中所有支持的加解密

def des3_encrypt(des_key, des_text)
  des =OpenSSL::Cipher::Cipher.new(ALG)
  des.encrypt
  des.key=des_key
  result = des.update(des_text)
  result << des.final
  data=Base64.encode64(result)
  data.gsub!("\n",'')
end

def des3_decrypt(des_key,des_text)
  des =OpenSSL::Cipher::Cipher.new(ALG)
  des.decrypt
  des.padding=7           # set pckspadding1--7
  des.key=des_key
  text = Base64.decode64(des_text)
  result = des.update(text).gsub(/\t|\b|\n/,'')
  result << des.final
  result
end

require 'digest/md5'

#MD5加密
Digest::MD5.hexdigest(data)