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// Copyright 2025 OpenPubkey
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package pktoken
import (
"crypto/rand"
"crypto/rsa"
"testing"
"github.com/lestrrat-go/jwx/v2/jwa"
"github.com/lestrrat-go/jwx/v2/jwk"
"github.com/lestrrat-go/jwx/v2/jws"
"github.com/stretchr/testify/require"
)
func TestVerifySignedMessage_TypOverride(t *testing.T) {
// Generate a test RSA key pair
key, err := rsa.GenerateKey(rand.Reader, 2048)
require.NoError(t, err)
// Convert RSA public key to JWK and set "alg" to RS256
jwkKey, err := jwk.FromRaw(&key.PublicKey)
require.NoError(t, err)
err = jwkKey.Set(jwk.AlgorithmKey, jwa.RS256)
require.NoError(t, err, "failed to set JWK alg")
// Use a consistent payload for both Op and Cic
payload := []byte("consistent payload")
// Create a mock Cic signature with "rz" and "upk" claims
cicProtected := jws.NewHeaders()
require.NoError(t, cicProtected.Set(jws.AlgorithmKey, jwa.RS256))
require.NoError(t, cicProtected.Set(jws.TypeKey, "CIC"))
require.NoError(t, cicProtected.Set("rz", "test-randomness")) // Required "rz" claim
require.NoError(t, cicProtected.Set("upk", jwkKey)) // Required "upk" claim with matching alg
cicOsm, err := jws.Sign(payload, jws.WithKey(jwa.RS256, key, jws.WithProtectedHeaders(cicProtected)))
require.NoError(t, err, "failed to create mock Cic")
// Create a mock Op signature (required by PKToken)
opProtected := jws.NewHeaders()
require.NoError(t, opProtected.Set(jws.AlgorithmKey, jwa.RS256))
require.NoError(t, opProtected.Set(jws.TypeKey, "JWT")) // OIDC type
opToken, err := jws.Sign(payload, jws.WithKey(jwa.RS256, key, jws.WithProtectedHeaders(opProtected)))
require.NoError(t, err, "failed to create mock Op")
// Initialize PKToken with Op and Cic signatures
p, err := New(opToken, cicOsm)
require.NoError(t, err, "failed to create PKToken")
// Get the real hash to use as "kid"
hash, err := p.Hash()
require.NoError(t, err, "failed to compute PKToken hash")
// Test 1: Verify message with "osm" typ
osmProtected := jws.NewHeaders()
require.NoError(t, osmProtected.Set(jws.AlgorithmKey, jwa.RS256))
require.NoError(t, osmProtected.Set(jws.KeyIDKey, hash)) // Use real hash as "kid"
require.NoError(t, osmProtected.Set(jws.TypeKey, "osm"))
osm, err := jws.Sign([]byte("test message"), jws.WithKey(jwa.RS256, key, jws.WithProtectedHeaders(osmProtected)))
require.NoError(t, err, "failed to create mock osm")
result, err := p.VerifySignedMessage(osm)
require.NoError(t, err, "expected no error for osm")
require.Equal(t, "test message", string(result))
// Test 2: Verify message with "JWT" typ
jwtProtected := jws.NewHeaders()
require.NoError(t, jwtProtected.Set(jws.AlgorithmKey, jwa.RS256))
require.NoError(t, jwtProtected.Set(jws.KeyIDKey, hash)) // Use real hash as "kid"
require.NoError(t, jwtProtected.Set(jws.TypeKey, "JWT"))
jwtOsm, err := jws.Sign([]byte("jwt message"), jws.WithKey(jwa.RS256, key, jws.WithProtectedHeaders(jwtProtected)))
require.NoError(t, err, "failed to create mock JWT")
result, err = p.VerifySignedMessage(jwtOsm, WithTyp("JWT"))
require.NoError(t, err, "expected no error for JWT")
require.Equal(t, "jwt message", string(result))
// Test 3: Verify failure without typ override
_, err = p.VerifySignedMessage(jwtOsm) // Expects "osm" by default
require.Error(t, err, "expected error for mismatched typ")
}
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