1 package ed448
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 "Ed448" }
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 0x0808 }
23 func (*scheme) SupportsContext() bool { return true }
24 func (*scheme) Oid() asn1.ObjectIdentifier {
25 return asn1.ObjectIdentifier{1, 3, 101, 113}
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 ctx := ""
42 if opts != nil {
43 ctx = opts.Context
44 }
45 return Sign(priv, message, ctx)
46 }
47
48 func (*scheme) Verify(
49 pk sign.PublicKey,
50 message, signature []byte,
51 opts *sign.SignatureOpts,
52 ) bool {
53 pub, ok := pk.(PublicKey)
54 if !ok {
55 panic(sign.ErrTypeMismatch)
56 }
57 ctx := ""
58 if opts != nil {
59 ctx = opts.Context
60 }
61 return Verify(pub, message, signature, ctx)
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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