37 lines
1 KiB
Crystal
37 lines
1 KiB
Crystal
require "../lib_sodium"
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module Sodium::CryptoBox
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class Box
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include Wipe
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MAC_SIZE = LibSodium.crypto_box_macbytes
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# BUG: precompute size
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@[Wipe::Var]
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@bytes = Bytes.new(1)
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def initialize(@secret_key : SecretKey, @public_key : PublicKey)
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# TODO: precompute using crypto_box_beforenm
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end
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def encrypt_easy(src)
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encrypt_easy src.to_slice
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end
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def encrypt_easy(src : Bytes, dst = Bytes.new(src.bytesize + MAC_SIZE), nonce = Nonce.new)
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if LibSodium.crypto_box_easy(dst, src, src.bytesize, nonce.to_slice, @public_key.to_slice, @secret_key.to_slice) != 0
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raise Error.new("crypto_box_easy")
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end
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{nonce, dst}
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end
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def decrypt_easy(src : Bytes, dst = Bytes.new(src.bytesize - MAC_SIZE), nonce = Nonce.new) : Bytes
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if LibSodium.crypto_box_open_easy(dst, src, src.bytesize, nonce.to_slice, @public_key.to_slice, @secret_key.to_slice) != 0
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raise Error::DecryptionFailed.new("crypto_box_open_easy")
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end
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dst
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end
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# TODO detached
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end
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end
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