Ruby RSA 如何分段加密
创建的 key 长度为 1024 用公钥加密比较长的字符串时会异常。 如何对长文本进行分段加密？
message = "long long text"
pkey = OpenSSL::PKey::RSA.new 1024
pkey.public_encrypt(message)
时隔多日回来追加答案
MAX_ENCRYPT_LENGTH = 117
MAX_DECRYPT_LENGTH = 128
#分段加密
def encrypt_msg(key, message)
bytes_array = message.unpack("C*")
input_length = bytes_array.length
encryt_str, offset, i = "", 0, 0
begin
encryt_bytes = bytes_array[offset, MAX_ENCRYPT_LENGTH]
encryt_str << key.public_encrypt(encryt_bytes.pack("C*")) #加密
offset = (i += 1) * MAX_ENCRYPT_LENGTH
end while input_length - offset > 0
Base64::strict_encode64(encryt_str)
end
#分段解密
def decrypt_msg(key, message)
bytes_array = Base64::decode64 message
input_length = bytes_array.length
decryt_str, offset, i = "", 0, 0
begin
decryt_bytes = bytes_array[offset, MAX_DECRYPT_LENGTH]
decryt_str << key.private_decrypt(decryt_bytes) #解密
offset = (i += 1) * MAX_DECRYPT_LENGTH
end while input_length - offset > 0
decryt_str
end
An RSA key can only encrypt data of a certain size, related to the key size. What you want to do is not what you are doing. RSA is rarely used to encrypt data directly. Instead, a symmetric key (AES, 3DES, or other secure algorithm) is used to encrypt the data using a randomly generated key, and then that key is encrypted with RSA.
From https://groups.google.com/forum/#!topic/rubyonrails-talk/K8nzLZhOOMo
你这个很有用，我找到了类似的。
#!/usr/bin/env ruby
require 'openssl'
key = "1234567890123456"
alg = "AES-128-CBC"
iv = "6543210987654321"
aes = OpenSSL::Cipher::Cipher.new(alg)
aes.encrypt
aes.key = key
aes.iv = iv
File.open("foo.enc",'w') do |enc|
File.open("foo") do |f|
loop do
r = f.read(4096)
break unless r
cipher = aes.update(r)
enc << cipher
end
end
enc << aes.final
end
key.private_decrypt(decryt_bytes) 的参数是要求的 string 类型，但是 decryt_bytes 是 byte 类型的，这个解密方法我在使用中报错啊
解密的时候，出现了 OpenSSL::PKey::RSAError: padding check failed 的提示，不管是一个数字 1 还是一长串的 string，放在在线平台上是能解密出来的，不知道是不是 OpenSSL::PKey::RSA 更新后改了，毕竟这个帖子离现在都近 7 年了。 楼主要是有新方法还请更新告知下，谢谢！