CODEWITHSUNDEEP
crystal-lang
Shurikan117
Shurikan117

Reputation: 105

No overload matches 'Slice(UInt8)#+' with type Slice(UInt8) when running code

I'm new to Crystal and came across the error no overload matches 'Slice(UInt8)#+' with type Slice(UInt8) when running the following code,

require "openssl"
NAME = "Boy"

cipher = OpenSSL::Cipher.new("AES-256-CBC")
cipher.encrypt
key = cipher.random_key
iv = cipher.random_iv

# Username

encrypted_name = cipher.update(NAME) + cipher.final
puts encrypted_name

decipher = OpenSSL::Cipher.new("AES-256-CBC")
decipher.decrypt
decipher.key = key
decipher.iv = iv

# Username

plain_name = decipher.update(encrypted_name) + decipher.final

puts plain_name

Any help is appreciated. The online ver is here

Upvotes: 1

Views: 104

Answers (1)

rogerdpack
rogerdpack

Reputation: 66851

In the line that fails compilation you're "adding" two slices together.

According to this spec:

https://github.com/crystal-lang/crystal/blob/master/spec/std/openssl/cipher_spec.cr

You basically have to add that to an IO first then you can convert it to a string.

ex: https://gist.github.com/rdp/349161fd5b10208dc7445fb5d9beefae (though it seems to only work locally not on crystal play)

Upvotes: 1

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