1 package ed25519
2
3 import (
4 "crypto/rand"
5 "encoding/asn1"
6
7 "github.com/cloudflare/circl/sign"
8 )
9
10 var sch sign.Scheme = &scheme{}
11
12
13 func Scheme() sign.Scheme { return sch }
14
15 type scheme struct{}
16
17 func (*scheme) Name() string { return "Ed25519" }
18 func (*scheme) PublicKeySize() int { return PublicKeySize }
19 func (*scheme) PrivateKeySize() int { return PrivateKeySize }
20 func (*scheme) SignatureSize() int { return SignatureSize }
21 func (*scheme) SeedSize() int { return SeedSize }
22 func (*scheme) TLSIdentifier() uint { return 0x0807 }
23 func (*scheme) SupportsContext() bool { return false }
24 func (*scheme) Oid() asn1.ObjectIdentifier {
25 return asn1.ObjectIdentifier{1, 3, 101, 112}
26 }
27
28 func (*scheme) GenerateKey() (sign.PublicKey, sign.PrivateKey, error) {
29 return GenerateKey(rand.Reader)
30 }
31
32 func (*scheme) Sign(
33 sk sign.PrivateKey,
34 message []byte,
35 opts *sign.SignatureOpts,
36 ) []byte {
37 priv, ok := sk.(PrivateKey)
38 if !ok {
39 panic(sign.ErrTypeMismatch)
40 }
41 if opts != nil && opts.Context != "" {
42 panic(sign.ErrContextNotSupported)
43 }
44 return Sign(priv, message)
45 }
46
47 func (*scheme) Verify(
48 pk sign.PublicKey,
49 message, signature []byte,
50 opts *sign.SignatureOpts,
51 ) bool {
52 pub, ok := pk.(PublicKey)
53 if !ok {
54 panic(sign.ErrTypeMismatch)
55 }
56 if opts != nil {
57 if opts.Context != "" {
58 panic(sign.ErrContextNotSupported)
59 }
60 }
61 return Verify(pub, message, signature)
62 }
63
64 func (*scheme) DeriveKey(seed []byte) (sign.PublicKey, sign.PrivateKey) {
65 privateKey := NewKeyFromSeed(seed)
66 publicKey := make(PublicKey, PublicKeySize)
67 copy(publicKey, privateKey[SeedSize:])
68 return publicKey, privateKey
69 }
70
71 func (*scheme) UnmarshalBinaryPublicKey(buf []byte) (sign.PublicKey, error) {
72 if len(buf) < PublicKeySize {
73 return nil, sign.ErrPubKeySize
74 }
75 pub := make(PublicKey, PublicKeySize)
76 copy(pub, buf[:PublicKeySize])
77 return pub, nil
78 }
79
80 func (*scheme) UnmarshalBinaryPrivateKey(buf []byte) (sign.PrivateKey, error) {
81 if len(buf) < PrivateKeySize {
82 return nil, sign.ErrPrivKeySize
83 }
84 priv := make(PrivateKey, PrivateKeySize)
85 copy(priv, buf[:PrivateKeySize])
86 return priv, nil
87 }
88
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