Baguette/sodium.cr
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Add ability to use existing buffer for encrypt_easy.

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Didactic Drunk 2019-05-29 00:59:32 -07:00
parent b69f55456b
commit 484847d57f
1 changed files with 21 additions and 6 deletions
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27
src/cox/secret_key.cr
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@ -5,6 +5,7 @@ module Cox
property bytes : Bytes
KEY_LENGTH = LibSodium::SECRET_KEY_BYTES
MAC_BYTES = LibSodium::MAC_BYTES
def initialize(@bytes : Bytes)
if bytes.bytesize != KEY_LENGTH
@ -31,21 +32,35 @@ module Cox
end
def encrypt_easy(data : Bytes, nonce : Nonce) : Bytes
output = Bytes.new(data.bytesize + LibSodium::MAC_BYTES)
if LibSodium.crypto_secretbox_easy(output, data, data.bytesize, nonce.pointer, @bytes) != 0
output = Bytes.new(data.bytesize + MAC_BYTES)
encrypt_easy(data, output, nonce)
end
def encrypt_easy(src : Bytes, dst : Bytes, nonce : Nonce) : Bytes
if dst.bytesize != (src.bytesize + MAC_BYTES)
raise ArgumentError.new("dst.bytesize must be src.bytesize + MAC_BYTES, got #{dst.bytesize}")
end
if LibSodium.crypto_secretbox_easy(dst, src, src.bytesize, nonce.pointer, @bytes) != 0
raise Cox::Error.new("crypto_secretbox_easy")
end
output
dst
end
def decrypt_easy(data : Bytes, nonce : Nonce) : Bytes
output_size = data.bytesize - LibSodium::MAC_BYTES
output_size = data.bytesize - MAC_BYTES
raise Cox::DecryptionFailed.new("encrypted data too small #{data.bytesize}") if output_size <= 0
output = Bytes.new output_size
if LibSodium.crypto_secretbox_open_easy(output, data, data.bytesize, nonce.pointer, @bytes) != 0
decrypt_easy(data, output, nonce)
end
def decrypt_easy(src : Bytes, dst : Bytes, nonce : Nonce) : Bytes
if dst.bytesize != (src.bytesize - MAC_BYTES)
raise ArgumentError.new("dst.bytesize must be src.bytesize - MAC_BYTES, got #{dst.bytesize}")
end
if LibSodium.crypto_secretbox_open_easy(dst, src, src.bytesize, nonce.pointer, @bytes) != 0
raise Cox::DecryptionFailed.new("crypto_secretbox_easy")
end
output
dst
end
# TODO: encrypt_detached