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@RiANOl
Last active April 13, 2024 06:17
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AES128 / AES256 CBC with PKCS7Padding in Ruby
require "openssl"
require "digest"
def aes128_cbc_encrypt(key, data, iv)
key = Digest::MD5.digest(key) if(key.kind_of?(String) && 16 != key.bytesize)
iv = Digest::MD5.digest(iv) if(iv.kind_of?(String) && 16 != iv.bytesize)
aes = OpenSSL::Cipher.new('AES-128-CBC')
aes.encrypt
aes.key = key
aes.iv = iv
aes.update(data) + aes.final
end
def aes256_cbc_encrypt(key, data, iv)
key = Digest::SHA256.digest(key) if(key.kind_of?(String) && 32 != key.bytesize)
iv = Digest::MD5.digest(iv) if(iv.kind_of?(String) && 16 != iv.bytesize)
aes = OpenSSL::Cipher.new('AES-256-CBC')
aes.encrypt
aes.key = key
aes.iv = iv
aes.update(data) + aes.final
end
def aes128_cbc_decrypt(key, data, iv)
key = Digest::MD5.digest(key) if(key.kind_of?(String) && 16 != key.bytesize)
iv = Digest::MD5.digest(iv) if(iv.kind_of?(String) && 16 != iv.bytesize)
aes = OpenSSL::Cipher.new('AES-128-CBC')
aes.decrypt
aes.key = key
aes.iv = iv
aes.update(data) + aes.final
end
def aes256_cbc_decrypt(key, data, iv)
key = Digest::SHA256.digest(key) if(key.kind_of?(String) && 32 != key.bytesize)
iv = Digest::MD5.digest(iv) if(iv.kind_of?(String) && 16 != iv.bytesize)
aes = OpenSSL::Cipher.new('AES-256-CBC')
aes.decrypt
aes.key = key
aes.iv = iv
aes.update(data) + aes.final
end
@efreesen
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efreesen commented Feb 1, 2013

Hey in line 24 and 32 you are doing the digest again.

And thank you for the code ;)

@xxxazxxx
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@efreesen is right. there is problem on line 24 and 32.

it should be
aes.key = key

@fooledbyprimes
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Nice. If I want to encrypt using openssl command line and then decrypt in Ruby then I always get things messed up in the Ruby decypt code. I think it would be helpful to have the command line analogs for comparison for newbies.

@JasonBristol
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Thank you, this is helpful

@RiANOl
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Author

RiANOl commented Feb 4, 2014

Thanks, fixed

@awesome
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awesome commented Feb 8, 2014

awesome!

@nurettin
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nurettin commented Jan 7, 2017

How do you decrypt these in java?

@edgardo001
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thanks, it works in ruby ​​2.4 on windows 10!

@arslanaly47
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How to go for PKCS5 encrypting in Ruby? I can't find any information on this.

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