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Add JSON marshalling and unmarshalling (#60)
* Add JSON marshalling and unmarshalling Signed-off-by: bytemare <3641580+bytemare@users.noreply.github.com> --------- Signed-off-by: bytemare <3641580+bytemare@users.noreply.github.com>
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Original file line number | Diff line number | Diff line change |
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// 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 | ||
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package group_test | ||
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import ( | ||
"bytes" | ||
"encoding" | ||
"encoding/hex" | ||
"strings" | ||
"testing" | ||
) | ||
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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 | ||
} | ||
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func testEncoding(t *testing.T, thing1, thing2 serde) { | ||
// empty string | ||
if err := thing2.DecodeHex(""); err == nil { | ||
t.Fatal("expected error on empty string") | ||
} | ||
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encoded := thing1.Encode() | ||
marshalled, _ := thing1.MarshalBinary() | ||
hexed := thing1.Hex() | ||
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jsoned, err := thing1.MarshalJSON() | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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if !bytes.Equal(encoded, marshalled) { | ||
t.Fatalf("Encode() and MarshalBinary() are expected to have the same output."+ | ||
"\twant: %v\tgot : %v", encoded, marshalled) | ||
} | ||
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if hex.EncodeToString(encoded) != hexed { | ||
t.Fatalf("Failed hex encoding, want %q, got %q", hex.EncodeToString(encoded), hexed) | ||
} | ||
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if err := thing2.Decode(nil); err == nil { | ||
t.Fatal("expected error on Decode() with nil input") | ||
} | ||
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if err := thing2.Decode(encoded); err != nil { | ||
t.Fatalf("Decode() failed on a valid encoding: %v. Value: %v", err, hex.EncodeToString(encoded)) | ||
} | ||
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if err := thing2.UnmarshalJSON(jsoned); err != nil { | ||
t.Fatalf("UnmarshalJSON() failed on a valid encoding: %v", err) | ||
} | ||
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if err := thing2.UnmarshalBinary(encoded); err != nil { | ||
t.Fatalf("UnmarshalBinary() failed on a valid encoding: %v", err) | ||
} | ||
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if err := thing2.DecodeHex(hexed); err != nil { | ||
t.Fatalf("DecodeHex() failed on valid hex encoding: %v", err) | ||
} | ||
} | ||
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func TestEncoding(t *testing.T) { | ||
testAll(t, func(group *testGroup) { | ||
g := group.group | ||
scalar := g.NewScalar().Random() | ||
testEncoding(t, scalar, g.NewScalar()) | ||
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scalar = g.NewScalar().Random() | ||
element := g.Base().Multiply(scalar) | ||
testEncoding(t, element, g.NewElement()) | ||
}) | ||
} | ||
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func testDecodingHexFails(t *testing.T, thing1, thing2 serde) { | ||
// empty string | ||
if err := thing2.DecodeHex(""); err == nil { | ||
t.Fatal("expected error on empty string") | ||
} | ||
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// malformed string | ||
hexed := thing1.Hex() | ||
malformed := []rune(hexed) | ||
malformed[0] = []rune("_")[0] | ||
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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) | ||
} | ||
} | ||
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func TestEncoding_Hex_Fails(t *testing.T) { | ||
testAll(t, func(group *testGroup) { | ||
g := group.group | ||
scalar := g.NewScalar().Random() | ||
testEncoding(t, scalar, g.NewScalar()) | ||
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scalar = g.NewScalar().Random() | ||
element := g.Base().Multiply(scalar) | ||
testEncoding(t, element, g.NewElement()) | ||
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// Hex fails | ||
testDecodingHexFails(t, scalar, g.NewScalar()) | ||
testDecodingHexFails(t, element, g.NewElement()) | ||
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// 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) | ||
} | ||
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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) | ||
} | ||
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if e.Equal(element) != 1 { | ||
t.Fatal(errExpectedEquality) | ||
} | ||
}) | ||
} |
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