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// Copyright 2022 Google LLC
//
// 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.
package signature_test
import (
"math/big"
"testing"
internal "github.com/tink-crypto/tink-go/v2/internal/signature"
commonpb "github.com/tink-crypto/tink-go/v2/proto/common_go_proto"
)
func TestValidatePublicExponent(t *testing.T) {
if err := internal.RSAValidPublicExponent(65537); err != nil {
t.Errorf("ValidPublicExponent(65537) err = %v, want nil", err)
}
}
func TestValidateInvalidPublicExponentFails(t *testing.T) {
if err := internal.RSAValidPublicExponent(3); err == nil {
t.Errorf("ValidPublicExponent(3) err = nil, want error")
}
}
func TestValidateModulusSizeInBits(t *testing.T) {
if err := internal.RSAValidModulusSizeInBits(2048); err != nil {
t.Errorf("ValidModulusSizeInBits(2048) err = %v, want nil", err)
}
}
func TestValidateInvalidModulusSizeInBitsFails(t *testing.T) {
if err := internal.RSAValidModulusSizeInBits(1024); err == nil {
t.Errorf("ValidModulusSizeInBits(1024) err = nil, want error")
}
}
func TestHashSafeForSignature(t *testing.T) {
for _, h := range []string{
"SHA256",
"SHA384",
"SHA512",
} {
t.Run(h, func(t *testing.T) {
if err := internal.HashSafeForSignature(h); err != nil {
t.Errorf("HashSafeForSignature(%q) err = %v, want nil", h, err)
}
})
}
}
func TestHashNotSafeForSignatureFails(t *testing.T) {
for _, h := range []string{
"SHA1",
"SHA224",
"MD5",
} {
t.Run(h, func(t *testing.T) {
if err := internal.HashSafeForSignature(h); err == nil {
t.Errorf("HashSafeForSignature(%q) err = nil, want error", h)
}
})
}
}
func TestValidateRSAPublicKeyParams(t *testing.T) {
f4 := new(big.Int).SetInt64(65537).Bytes()
invalidPubExponent := new(big.Int).SetInt64(65537 + 1).Bytes()
publicExponentTooLarge := make([]byte, 65)
publicExponentTooLarge[0] = 0xff
for _, tc := range []struct {
name string
hashType commonpb.HashType
modulusSizeBits int
pubExponent []byte
wantErr bool
}{
{
name: "valid",
hashType: commonpb.HashType_SHA256,
modulusSizeBits: 2048,
pubExponent: f4,
wantErr: false,
},
{
name: "hash unsafe for signature",
hashType: commonpb.HashType_SHA1,
modulusSizeBits: 2048,
pubExponent: f4,
wantErr: true,
},
{
name: "modulus size too small",
hashType: commonpb.HashType_SHA256,
modulusSizeBits: 1024,
pubExponent: f4,
wantErr: true,
},
{
name: "public exponent not F4",
hashType: commonpb.HashType_SHA256,
modulusSizeBits: 2048,
pubExponent: invalidPubExponent,
wantErr: true,
},
{
name: "public exponent too large",
hashType: commonpb.HashType_SHA256,
modulusSizeBits: 2048,
pubExponent: publicExponentTooLarge,
wantErr: true,
},
} {
t.Run(tc.name, func(t *testing.T) {
err := internal.ValidateRSAPublicKeyParams(tc.hashType, tc.modulusSizeBits, tc.pubExponent)
if tc.wantErr && err == nil {
t.Errorf("ValidateRSAPublicKeyParams(%v, %v, %v) err = nil, want error", tc.hashType, tc.modulusSizeBits, tc.pubExponent)
}
if !tc.wantErr && err != nil {
t.Errorf("ValidateRSAPublicKeyParams(%v, %v, %v) err = %v, want nil", tc.hashType, tc.modulusSizeBits, tc.pubExponent, err)
}
})
}
}
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