sodium.cr/src/cox.cr

66 lines
2.3 KiB
Crystal

require "random/secure"
module Cox
class Error < ::Exception
end
class VerificationFailed < Error
end
class DecryptionFailed < Error
end
end
require "./cox/*"
module Cox
def self.encrypt(data, nonce : Nonce, recipient_public_key : PublicKey, sender_secret_key : SecretKey)
data_buffer = data.to_slice
data_size = data_buffer.bytesize
output_buffer = Bytes.new(data_buffer.bytesize + LibSodium::MAC_SIZE)
if LibSodium.crypto_box_easy(output_buffer.to_unsafe, data_buffer, data_size, nonce.pointer, recipient_public_key.pointer, sender_secret_key.pointer) != 0
raise Error.new("crypto_box_easy")
end
output_buffer
end
def self.encrypt(data, recipient_public_key : PublicKey, sender_secret_key : SecretKey)
nonce = Nonce.new
{nonce, encrypt(data, nonce, recipient_public_key, sender_secret_key)}
end
def self.decrypt(data, nonce : Nonce, sender_public_key : PublicKey, recipient_secret_key : SecretKey)
data_buffer = data.to_slice
data_size = data_buffer.bytesize
output_buffer = Bytes.new(data_buffer.bytesize - LibSodium::MAC_SIZE)
if LibSodium.crypto_box_open_easy(output_buffer.to_unsafe, data_buffer.to_unsafe, data_size, nonce.pointer, sender_public_key.pointer, recipient_secret_key.pointer) != 0
raise DecryptionFailed.new("crypto_box_open_easy")
end
output_buffer
end
def self.sign_detached(message, secret_key : SignSecretKey)
message_buffer = message.to_slice
message_buffer_size = message_buffer.bytesize
signature_output_buffer = Bytes.new(LibSodium::SIGNATURE_SIZE)
if LibSodium.crypto_sign_detached(signature_output_buffer.to_unsafe, 0, message_buffer.to_unsafe, message_buffer_size, secret_key.pointer) != 0
raise Error.new("crypto_sign_detached")
end
signature_output_buffer
end
def self.verify_detached(signature, message, public_key : SignPublicKey)
signature_buffer = signature.to_slice
message_buffer = message.to_slice
message_buffer_size = message_buffer.bytesize
verified = LibSodium.crypto_sign_verify_detached(signature_buffer.to_unsafe, message_buffer.to_unsafe, message_buffer_size, public_key.pointer)
verified.zero?
end
end
if Cox::LibSodium.sodium_init() == -1
STDERR.puts("Failed to init libsodium")
exit(1)
end