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package cose
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"encoding/base64"
"math/big"
"reflect"
"testing"
)
func mustBase64ToBigInt(s string) *big.Int {
val, err := base64.RawURLEncoding.DecodeString(s)
if err != nil {
panic(err)
}
return new(big.Int).SetBytes(val)
}
func generateBogusECKey() *ecdsa.PublicKey {
return &ecdsa.PublicKey{
Curve: elliptic.P256(),
// x-coord is not on curve p-256
X: mustBase64ToBigInt("MKBCTNIcKUSDii11ySs3526iDZ8AiTo7Tu6KPAqx7D4"),
Y: mustBase64ToBigInt("4Etl6SRW2YiLUrN5vfvVHuhp7x8PxltmWWlbbM4IFyM"),
}
}
func TestNewVerifier(t *testing.T) {
// generate ecdsa key
ecdsaKey := generateTestECDSAKey(t).Public().(*ecdsa.PublicKey)
// generate ed25519 key
ed25519Key, _ := generateTestEd25519Key(t)
// generate rsa keys
rsaKey := generateTestRSAKey(t).Public().(*rsa.PublicKey)
var rsaKeyLowEntropy *rsa.PublicKey
if key, err := rsa.GenerateKey(rand.Reader, 1024); err != nil {
t.Fatalf("rsa.GenerateKey() error = %v", err)
} else {
rsaKeyLowEntropy = &key.PublicKey
}
// craft an EC public key with the x-coord not on curve
ecdsaKeyPointNotOnCurve := generateBogusECKey()
// craft an EC public key with a curve not supported by crypto/ecdh
ecdsaKeyUnsupportedCurve := &ecdsa.PublicKey{
Curve: ecdsaKey.Curve.Params(),
X: ecdsaKey.X,
Y: ecdsaKey.Y,
}
// run tests
tests := []struct {
name string
alg Algorithm
key crypto.PublicKey
want Verifier
wantErr string
}{
{
name: "ecdsa key verifier",
alg: AlgorithmES256,
key: ecdsaKey,
want: &ecdsaVerifier{
alg: AlgorithmES256,
key: ecdsaKey,
},
},
{
name: "ecdsa invalid public key",
alg: AlgorithmES256,
key: rsaKey,
wantErr: "ES256: invalid public key",
},
{
name: "ed25519 verifier",
alg: AlgorithmEdDSA,
key: ed25519Key,
want: &ed25519Verifier{
key: ed25519Key,
},
},
{
name: "ed25519 invalid public key",
alg: AlgorithmEdDSA,
key: rsaKey,
wantErr: "EdDSA: invalid public key",
},
{
name: "rsa verifier",
alg: AlgorithmPS256,
key: rsaKey,
want: &rsaVerifier{
alg: AlgorithmPS256,
key: rsaKey,
},
},
{
name: "rsa invalid public key",
alg: AlgorithmPS256,
key: ecdsaKey,
wantErr: "PS256: invalid public key",
},
{
name: "rsa key under minimum entropy",
alg: AlgorithmPS256,
key: rsaKeyLowEntropy,
wantErr: "RSA key must be at least 2048 bits long",
},
{
name: "unsupported rsa signing algorithm",
alg: AlgorithmRS256,
wantErr: "can't create new Verifier for RS256: no built-in implementation available: algorithm not supported",
},
{
name: "reserved algorithm",
alg: AlgorithmReserved,
wantErr: "can't create new Verifier for Reserved: can't be implemented: algorithm not supported",
},
{
name: "unassigned algorithm",
alg: -1,
wantErr: "can't create new Verifier for Algorithm(-1): unknown algorithm: algorithm not supported",
},
{
name: "bogus ecdsa public key (point not on curve)",
alg: AlgorithmES256,
key: ecdsaKeyPointNotOnCurve,
wantErr: "ES256: invalid public key",
},
{
name: "ecdsa public key with unsupported curve",
alg: AlgorithmES256,
key: ecdsaKeyUnsupportedCurve,
wantErr: "ES256: invalid public key: ecdsa: unsupported curve by crypto/ecdh",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got, err := NewVerifier(tt.alg, tt.key)
if err != nil && (err.Error() != tt.wantErr) {
t.Errorf("NewVerifier() error = %v, wantErr %v", err, tt.wantErr)
return
} else if err == nil && (tt.wantErr != "") {
t.Errorf("NewVerifier() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("NewVerifier() = %v, want %v", got, tt.want)
}
})
}
}
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