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# encoding: binary
# frozen_string_literal: true
RSpec.shared_examples "aead" do
let(:corrupt_ciphertext) { ciphertext.succ }
let(:trunc_ciphertext) { ciphertext[0, 20] }
let(:invalid_nonce) { nonce[0, nonce.bytesize / 2] } # too short!
let(:invalid_nonce_long) { nonce + nonce } # too long!
let(:nonce_error_regex) { /Nonce.*(Expected #{aead.nonce_bytes})/ }
let(:corrupt_ad) { ad.succ }
let(:trunc_ad) { ad[0, ad.bytesize / 2] }
let(:aead) { described_class.new(key) }
context "new" do
it "accepts strings" do
expect { described_class.new(key) }.to_not raise_error
end
it "raises on a nil key" do
expect { described_class.new(nil) }.to raise_error(TypeError)
end
it "raises on a short key" do
expect { described_class.new("hello") }.to raise_error RbNaCl::LengthError
end
it "raises on a long key" do
expect { described_class.new("hello" + key) }.to raise_error RbNaCl::LengthError
end
end
context "encrypt" do
it "encrypts a message" do
expect(aead.encrypt(nonce, message, ad)).to eq ciphertext
end
it "raises on a short nonce" do
expect do
aead.encrypt(invalid_nonce, message, ad)
end.to raise_error(RbNaCl::LengthError, nonce_error_regex)
end
it "raises on a long nonce" do
expect do
aead.encrypt(invalid_nonce_long, message, ad)
end.to raise_error(RbNaCl::LengthError, nonce_error_regex)
end
it "works with an empty message" do
expect do
aead.encrypt(nonce, nil, ad)
end.to_not raise_error
end
it "works with an empty additional data" do
expect do
aead.encrypt(nonce, message, nil)
end.to_not raise_error
end
end
context "decrypt" do
it "decrypts a message" do
expect(aead.decrypt(nonce, ciphertext, ad)).to eq message
end
it "raises on a truncated message to decrypt" do
expect do
aead.decrypt(nonce, trunc_ciphertext, ad)
end.to raise_error(RbNaCl::CryptoError, /Decryption failed. Ciphertext failed verification./)
end
it "raises on a corrupt ciphertext" do
expect do
aead.decrypt(nonce, corrupt_ciphertext, ad)
end.to raise_error(RbNaCl::CryptoError, /Decryption failed. Ciphertext failed verification./)
end
it "raises when the additional data is truncated" do
expect do
aead.decrypt(nonce, ciphertext, corrupt_ad)
end.to raise_error(RbNaCl::CryptoError, /Decryption failed. Ciphertext failed verification./)
end
it "raises when the additional data is corrupt " do
expect do
aead.decrypt(nonce, ciphertext, trunc_ad)
end.to raise_error(RbNaCl::CryptoError, /Decryption failed. Ciphertext failed verification./)
end
it "raises on a short nonce" do
expect do
aead.decrypt(invalid_nonce, message, ad)
end.to raise_error(RbNaCl::LengthError, nonce_error_regex)
end
it "raises on a long nonce" do
expect do
aead.decrypt(invalid_nonce_long, message, ad)
end.to raise_error(RbNaCl::LengthError, nonce_error_regex)
end
end
end
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