add HS256/384/512 hash support

pkg/client/rp/verifier_test.go

@@ -255,7 +255,11 @@ func TestVerifyIDToken(t *testing.T) {
 
 func TestVerifyAccessToken(t *testing.T) {
 	token, _ := tu.ValidAccessToken()
-	hash, err := oidc.ClaimHash(token, tu.SignatureAlgorithm)
+	sigAlgoRS256 := jose.RS256
+	hashRS256, err := oidc.ClaimHash(token, sigAlgoRS256)
+	require.NoError(t, err)
+	sigAlgoHS256 := jose.HS256
+	hashHS256, err := oidc.ClaimHash(token, sigAlgoHS256)
 	require.NoError(t, err)
 
 	type args struct {
@@ -272,18 +276,26 @@ func TestVerifyAccessToken(t *testing.T) {
 			name: "empty hash",
 		},
 		{
-			name: "success",
+			name: "success RS256",
 			args: args{
 				accessToken:  token,
-				atHash:       hash,
+				atHash:       hashRS256,
-				sigAlgorithm: tu.SignatureAlgorithm,
+				sigAlgorithm: sigAlgoRS256,
+			},
+		},
+		{
+			name: "success HS256",
+			args: args{
+				accessToken:  token,
+				atHash:       hashHS256,
+				sigAlgorithm: sigAlgoHS256,
 			},
 		},
 		{
 			name: "invalid algorithm",
 			args: args{
 				accessToken:  token,
-				atHash:       hash,
+				atHash:       hashRS256,
 				sigAlgorithm: "foo",
 			},
 			wantErr: true,
@@ -293,7 +305,7 @@ func TestVerifyAccessToken(t *testing.T) {
 			args: args{
 				accessToken:  token,
 				atHash:       "~~",
-				sigAlgorithm: tu.SignatureAlgorithm,
+				sigAlgorithm: sigAlgoRS256,
 			},
 			wantErr: true,
 		},

pkg/crypto/hash.go

@@ -15,11 +15,11 @@ var ErrUnsupportedAlgorithm = errors.New("unsupported signing algorithm")
 
 func GetHashAlgorithm(sigAlgorithm jose.SignatureAlgorithm) (hash.Hash, error) {
 	switch sigAlgorithm {
-	case jose.RS256, jose.ES256, jose.PS256:
+	case jose.RS256, jose.ES256, jose.PS256, jose.HS256:
 		return sha256.New(), nil
-	case jose.RS384, jose.ES384, jose.PS384:
+	case jose.RS384, jose.ES384, jose.PS384, jose.HS384:
 		return sha512.New384(), nil
-	case jose.RS512, jose.ES512, jose.PS512:
+	case jose.RS512, jose.ES512, jose.PS512, jose.HS512:
 		return sha512.New(), nil
 
 	// There is no published spec for this yet, but we have confirmation it will get published.

pkg/oidc/verifier.go

@@ -186,7 +186,7 @@ func toJoseSignatureAlgorithms(algorithms []string) []jose.SignatureAlgorithm {
 		out[i] = jose.SignatureAlgorithm(algorithms[i])
 	}
 	if len(out) == 0 {
-		out = append(out, jose.RS256, jose.ES256, jose.PS256)
+		out = append(out, jose.RS256, jose.ES256, jose.PS256, jose.RS256)
 	}
 	return out
 }