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|
require 'spec_helper'
describe JSON::JWE do
let(:shared_key) { SecureRandom.hex 32 } # default shared key is too short
let(:private_key_path) { der_file_path 'rsa/private_key' }
describe '#content_type' do
let(:jwe) { JSON::JWE.new 'hello' }
it do
jwe.content_type.should == 'application/jose'
end
end
describe 'encrypt!' do
shared_examples_for :gcm_encryption_unsupported do
if gcm_supported?
skip 'GSM supported'
else
context 'when enc=A128GCM' do
before { jwe.enc = :A128GCM }
it do
expect do
jwe.encrypt! key
end.to raise_error JSON::JWE::UnexpectedAlgorithm
end
end
context 'when enc=A256GCM' do
before { jwe.enc = :A256GCM }
it do
expect do
jwe.encrypt! key
end.to raise_error JSON::JWE::UnexpectedAlgorithm
end
end
end
end
shared_examples_for :unexpected_algorithm_for_encryption do
it do
expect do
jwe.encrypt!(key).to_s # NOTE: encrypt! won't raise, but to_s does. might need to fix.
end.to raise_error JSON::JWE::UnexpectedAlgorithm
end
end
shared_examples_for :unsupported_algorithm_for_encryption do
it do
expect do
jwe.encrypt!(key).to_s # NOTE: encrypt! won't raise, but to_s does. might need to fix.
end.to raise_error NotImplementedError
end
end
context 'when plaintext given' do
let(:plain_text) { 'Hello World' }
let(:jwe) { JSON::JWE.new plain_text }
context 'when alg=RSA1_5' do
let(:key) { public_key }
before { jwe.alg = :'RSA1_5' }
it_behaves_like :gcm_encryption_unsupported
end
context 'when alg=RSA-OAEP' do
let(:key) { public_key }
before { jwe.alg = :'RSA-OAEP' }
it_behaves_like :gcm_encryption_unsupported
end
context 'when alg=dir' do
it :TODO
end
context 'when unknonw/unsupported algorithm given' do
let(:key) { public_key }
let(:alg) { :RSA1_5 }
let(:enc) { :'A128CBC-HS256' }
before { jwe.alg, jwe.enc = alg, enc }
context 'when alg=unknown' do
let(:alg) { :unknown }
it_behaves_like :unexpected_algorithm_for_encryption
end
context 'when enc=unknown' do
let(:enc) { :unknown }
it_behaves_like :unexpected_algorithm_for_encryption
end
[:A128KW, :A256KW, :'ECDH-ES', :'ECDH-ES+A128KW', :'ECDH-ES+A256KW'].each do |alg|
context "when alg=#{alg}" do
let(:alg) { alg }
it_behaves_like :unsupported_algorithm_for_encryption
end
end
end
end
context 'when jwt given' do
let(:plain_text) { jwt.to_s }
let(:jwt) { JSON::JWT.new(foo: :bar) }
let(:jwe) { JSON::JWE.new jwt }
context 'when alg=RSA-OAEP' do
let(:key) { public_key }
before { jwe.alg = :'RSA1_5' }
it_behaves_like :gcm_encryption_unsupported
end
context 'when alg=RSA-OAEP' do
let(:key) { public_key }
before { jwe.alg = :'RSA-OAEP' }
it_behaves_like :gcm_encryption_unsupported
end
end
end
describe 'decrypt!' do
let(:plain_text) { 'Hello World' }
let(:jwe_string) do
_jwe_ = JSON::JWE.new plain_text
_jwe_.alg, _jwe_.enc = alg, enc
_jwe_.encrypt! key
_jwe_.to_s
end
let(:jwe) do
_jwe_ = JSON::JWE.decode jwe_string, :skip_decryption
_jwe_.alg, _jwe_.enc = alg, enc
_jwe_
end
shared_examples_for :decryptable do
it do
jwe.decrypt! key
jwe.plain_text.should == plain_text
end
end
shared_examples_for :gcm_decryption_unsupported do
it do
expect do
jwe.decrypt! key
end.to raise_error JSON::JWE::UnexpectedAlgorithm
end
end
shared_examples_for :verify_cbc_authentication_tag do
let(:jwe_string) do
_jwe_ = JSON::JWE.new plain_text
_jwe_.alg, _jwe_.enc = alg, enc
_jwe_.encrypt! key
_jwe_.to_s + 'tampered'
end
it do
expect do
jwe.decrypt! key
end.to raise_error JSON::JWE::DecryptionFailed
end
end
shared_examples_for :verify_gcm_authentication_tag do
let(:jwe_string) do
_jwe_ = JSON::JWE.new plain_text
_jwe_.alg, _jwe_.enc = alg, enc
_jwe_.encrypt! key
header, key, iv, cipher_text, auth_tag = _jwe_.to_s.split('.')
truncated_auth_tag = Base64.urlsafe_decode64(auth_tag).slice(0..-2)
truncated_auth_tag = Base64.urlsafe_encode64(truncated_auth_tag, padding: false)
[header, key, iv, cipher_text, truncated_auth_tag].join('.')
end
it do
expect do
jwe.decrypt! key
end.to raise_error JSON::JWE::DecryptionFailed
end
end
shared_examples_for :unexpected_algorithm_for_decryption do
it do
expect do
jwe.decrypt! key
end.to raise_error JSON::JWE::UnexpectedAlgorithm
end
end
shared_examples_for :unsupported_algorithm_for_decryption do
it do
expect do
jwe.decrypt! key
end.to raise_error NotImplementedError
end
end
context 'when alg=RSA1_5' do
let(:alg) { :RSA1_5 }
let(:key) { private_key }
context 'when enc=A128GCM' do
let(:enc) { :A128GCM }
if gcm_supported?
it_behaves_like :decryptable
it_behaves_like :verify_gcm_authentication_tag
else
it_behaves_like :gcm_decryption_unsupported
end
end
context 'when enc=A256GCM' do
let(:enc) { :A256GCM }
if gcm_supported?
it_behaves_like :decryptable
it_behaves_like :verify_gcm_authentication_tag
else
it_behaves_like :gcm_decryption_unsupported
end
end
context 'when enc=A128CBC-HS256' do
let(:enc) { :'A128CBC-HS256' }
it_behaves_like :decryptable
end
context 'when enc=A256CBC-HS512' do
let(:enc) { :'A256CBC-HS512' }
it_behaves_like :decryptable
end
end
context 'when alg=RSA-OAEP' do
let(:alg) { :'RSA-OAEP' }
let(:key) { private_key }
context 'when enc=A128GCM' do
let(:enc) { :A128GCM }
if gcm_supported?
it_behaves_like :decryptable
it_behaves_like :verify_gcm_authentication_tag
else
it_behaves_like :gcm_decryption_unsupported
end
end
context 'when enc=A256GCM' do
let(:enc) { :A256GCM }
if gcm_supported?
it_behaves_like :decryptable
it_behaves_like :verify_gcm_authentication_tag
else
it_behaves_like :gcm_decryption_unsupported
end
end
context 'when enc=A128CBC-HS256' do
let(:enc) { :'A128CBC-HS256' }
it_behaves_like :decryptable
it_behaves_like :verify_cbc_authentication_tag
end
context 'when enc=A256CBC-HS512' do
let(:enc) { :'A256CBC-HS512' }
it_behaves_like :decryptable
it_behaves_like :verify_cbc_authentication_tag
end
end
context 'when alg=dir' do
let(:alg) { :dir }
let(:key) { shared_key }
context 'when enc=A128GCM' do
let(:enc) { :A128GCM }
if gcm_supported?
it_behaves_like :decryptable
it_behaves_like :verify_gcm_authentication_tag
else
it_behaves_like :gcm_decryption_unsupported
end
end
context 'when enc=A256GCM' do
let(:enc) { :A256GCM }
if gcm_supported?
it_behaves_like :decryptable
it_behaves_like :verify_gcm_authentication_tag
else
it_behaves_like :gcm_decryption_unsupported
end
end
context 'when enc=A128CBC-HS256' do
let(:enc) { :'A128CBC-HS256' }
it_behaves_like :decryptable
it_behaves_like :verify_cbc_authentication_tag
end
context 'when enc=A256CBC-HS512' do
let(:enc) { :'A256CBC-HS512' }
it_behaves_like :decryptable
it_behaves_like :verify_cbc_authentication_tag
end
end
context 'when unknonw/unsupported algorithm given' do
let(:input) { 'header.key.iv.cipher_text.auth_tag' }
let(:key) { public_key }
let(:alg) { :RSA1_5 }
let(:enc) { :'A128CBC-HS256' }
context 'when alg=unknown' do
let(:alg) { :unknown }
it_behaves_like :unexpected_algorithm_for_decryption
end
context 'when enc=unknown' do
let(:enc) { :unknown }
it_behaves_like :unexpected_algorithm_for_decryption
end
[:A128KW, :A256KW, :'ECDH-ES', :'ECDH-ES+A128KW', :'ECDH-ES+A256KW'].each do |alg|
context "when alg=#{alg}" do
let(:alg) { alg }
it_behaves_like :unsupported_algorithm_for_decryption
end
end
end
end
end
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