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Add JSON marshalling and unmarshalling (#60)
* Add JSON marshalling and unmarshalling Signed-off-by: bytemare <[email protected]> --------- Signed-off-by: bytemare <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| // SPDX-License-Identifier: MIT | ||
| // | ||
| // Copyright (C) 2024 Daniel Bourdrez. All Rights Reserved. | ||
| // | ||
| // This source code is licensed under the MIT license found in the | ||
| // LICENSE file in the root directory of this source tree or at | ||
| // https://spdx.org/licenses/MIT.html | ||
|
|
||
| package group_test | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding" | ||
| "encoding/hex" | ||
| "strings" | ||
| "testing" | ||
| ) | ||
|
|
||
| type serde interface { | ||
| Encode() []byte | ||
| Decode(data []byte) error | ||
| MarshalJSON() ([]byte, error) | ||
| UnmarshalJSON(data []byte) error | ||
| Hex() string | ||
| DecodeHex(h string) error | ||
| encoding.BinaryMarshaler | ||
| encoding.BinaryUnmarshaler | ||
| } | ||
|
|
||
| func testEncoding(t *testing.T, thing1, thing2 serde) { | ||
| // empty string | ||
| if err := thing2.DecodeHex(""); err == nil { | ||
| t.Fatal("expected error on empty string") | ||
| } | ||
|
|
||
| encoded := thing1.Encode() | ||
| marshalled, _ := thing1.MarshalBinary() | ||
| hexed := thing1.Hex() | ||
|
|
||
| jsoned, err := thing1.MarshalJSON() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| if !bytes.Equal(encoded, marshalled) { | ||
| t.Fatalf("Encode() and MarshalBinary() are expected to have the same output."+ | ||
| "\twant: %v\tgot : %v", encoded, marshalled) | ||
| } | ||
|
|
||
| if hex.EncodeToString(encoded) != hexed { | ||
| t.Fatalf("Failed hex encoding, want %q, got %q", hex.EncodeToString(encoded), hexed) | ||
| } | ||
|
|
||
| if err := thing2.Decode(nil); err == nil { | ||
| t.Fatal("expected error on Decode() with nil input") | ||
| } | ||
|
|
||
| if err := thing2.Decode(encoded); err != nil { | ||
| t.Fatalf("Decode() failed on a valid encoding: %v. Value: %v", err, hex.EncodeToString(encoded)) | ||
| } | ||
|
|
||
| if err := thing2.UnmarshalJSON(jsoned); err != nil { | ||
| t.Fatalf("UnmarshalJSON() failed on a valid encoding: %v", err) | ||
| } | ||
|
|
||
| if err := thing2.UnmarshalBinary(encoded); err != nil { | ||
| t.Fatalf("UnmarshalBinary() failed on a valid encoding: %v", err) | ||
| } | ||
|
|
||
| if err := thing2.DecodeHex(hexed); err != nil { | ||
| t.Fatalf("DecodeHex() failed on valid hex encoding: %v", err) | ||
| } | ||
| } | ||
|
|
||
| func TestEncoding(t *testing.T) { | ||
| testAll(t, func(group *testGroup) { | ||
| g := group.group | ||
| scalar := g.NewScalar().Random() | ||
| testEncoding(t, scalar, g.NewScalar()) | ||
|
|
||
| scalar = g.NewScalar().Random() | ||
| element := g.Base().Multiply(scalar) | ||
| testEncoding(t, element, g.NewElement()) | ||
| }) | ||
| } | ||
|
|
||
| func testDecodingHexFails(t *testing.T, thing1, thing2 serde) { | ||
| // empty string | ||
| if err := thing2.DecodeHex(""); err == nil { | ||
| t.Fatal("expected error on empty string") | ||
| } | ||
|
|
||
| // malformed string | ||
| hexed := thing1.Hex() | ||
| malformed := []rune(hexed) | ||
| malformed[0] = []rune("_")[0] | ||
|
|
||
| if err := thing2.DecodeHex(string(malformed)); err == nil { | ||
| t.Fatal("expected error on malformed string") | ||
| } else if !strings.HasSuffix(err.Error(), "DecodeHex: encoding/hex: invalid byte: U+005F '_'") { | ||
| t.Fatalf("unexpected error: %q", err) | ||
| } | ||
| } | ||
|
|
||
| func TestEncoding_Hex_Fails(t *testing.T) { | ||
| testAll(t, func(group *testGroup) { | ||
| g := group.group | ||
| scalar := g.NewScalar().Random() | ||
| testEncoding(t, scalar, g.NewScalar()) | ||
|
|
||
| scalar = g.NewScalar().Random() | ||
| element := g.Base().Multiply(scalar) | ||
| testEncoding(t, element, g.NewElement()) | ||
|
|
||
| // Hex fails | ||
| testDecodingHexFails(t, scalar, g.NewScalar()) | ||
| testDecodingHexFails(t, element, g.NewElement()) | ||
|
|
||
| // Doesn't yield the same decoded result | ||
| scalar = g.NewScalar().Random() | ||
| s := g.NewScalar() | ||
| if err := s.DecodeHex(scalar.Hex()); err != nil { | ||
| t.Fatalf("unexpected error on valid encoding: %s", err) | ||
| } | ||
|
|
||
| if s.Equal(scalar) != 1 { | ||
| t.Fatal(errExpectedEquality) | ||
| } | ||
|
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| element = g.Base().Multiply(scalar) | ||
| e := g.NewElement() | ||
| if err := e.DecodeHex(element.Hex()); err != nil { | ||
| t.Fatalf("unexpected error on valid encoding: %s", err) | ||
| } | ||
|
|
||
| if e.Equal(element) != 1 { | ||
| t.Fatal(errExpectedEquality) | ||
| } | ||
| }) | ||
| } |
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