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| 1 | +/* |
| 2 | +Copyright 2020 The Flux authors |
| 3 | +
|
| 4 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | +you may not use this file except in compliance with the License. |
| 6 | +You may obtain a copy of the License at |
| 7 | +
|
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +
|
| 10 | +Unless required by applicable law or agreed to in writing, software |
| 11 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | +See the License for the specific language governing permissions and |
| 14 | +limitations under the License. |
| 15 | +*/ |
| 16 | + |
| 17 | +package testutils |
| 18 | + |
| 19 | +import ( |
| 20 | + "crypto/ecdsa" |
| 21 | + "crypto/ed25519" |
| 22 | + "crypto/elliptic" |
| 23 | + "crypto/rand" |
| 24 | + "crypto/rsa" |
| 25 | + "crypto/x509" |
| 26 | + "encoding/pem" |
| 27 | + |
| 28 | + "golang.org/x/crypto/ssh" |
| 29 | +) |
| 30 | + |
| 31 | +// KeyPair holds the public and private key PEM block bytes. |
| 32 | +type KeyPair struct { |
| 33 | + PublicKey []byte |
| 34 | + PrivateKey []byte |
| 35 | +} |
| 36 | + |
| 37 | +type KeyPairGenerator interface { |
| 38 | + Generate() (*KeyPair, error) |
| 39 | +} |
| 40 | + |
| 41 | +type RSAGenerator struct { |
| 42 | + bits int |
| 43 | +} |
| 44 | + |
| 45 | +func NewRSAGenerator(bits int) KeyPairGenerator { |
| 46 | + return &RSAGenerator{bits} |
| 47 | +} |
| 48 | + |
| 49 | +func (g *RSAGenerator) Generate() (*KeyPair, error) { |
| 50 | + pk, err := rsa.GenerateKey(rand.Reader, g.bits) |
| 51 | + if err != nil { |
| 52 | + return nil, err |
| 53 | + } |
| 54 | + err = pk.Validate() |
| 55 | + if err != nil { |
| 56 | + return nil, err |
| 57 | + } |
| 58 | + pub, err := generatePublicKey(&pk.PublicKey) |
| 59 | + if err != nil { |
| 60 | + return nil, err |
| 61 | + } |
| 62 | + priv, err := encodePrivateKeyToPEM(pk) |
| 63 | + if err != nil { |
| 64 | + return nil, err |
| 65 | + } |
| 66 | + return &KeyPair{ |
| 67 | + PublicKey: pub, |
| 68 | + PrivateKey: priv, |
| 69 | + }, nil |
| 70 | +} |
| 71 | + |
| 72 | +type ECDSAGenerator struct { |
| 73 | + c elliptic.Curve |
| 74 | +} |
| 75 | + |
| 76 | +func NewECDSAGenerator(c elliptic.Curve) KeyPairGenerator { |
| 77 | + return &ECDSAGenerator{c} |
| 78 | +} |
| 79 | + |
| 80 | +func (g *ECDSAGenerator) Generate() (*KeyPair, error) { |
| 81 | + pk, err := ecdsa.GenerateKey(g.c, rand.Reader) |
| 82 | + if err != nil { |
| 83 | + return nil, err |
| 84 | + } |
| 85 | + pub, err := generatePublicKey(&pk.PublicKey) |
| 86 | + if err != nil { |
| 87 | + return nil, err |
| 88 | + } |
| 89 | + priv, err := encodePrivateKeyToPEM(pk) |
| 90 | + if err != nil { |
| 91 | + return nil, err |
| 92 | + } |
| 93 | + return &KeyPair{ |
| 94 | + PublicKey: pub, |
| 95 | + PrivateKey: priv, |
| 96 | + }, nil |
| 97 | +} |
| 98 | + |
| 99 | +type Ed25519Generator struct{} |
| 100 | + |
| 101 | +func NewEd25519Generator() KeyPairGenerator { |
| 102 | + return &Ed25519Generator{} |
| 103 | +} |
| 104 | + |
| 105 | +func (g *Ed25519Generator) Generate() (*KeyPair, error) { |
| 106 | + pk, pv, err := ed25519.GenerateKey(rand.Reader) |
| 107 | + if err != nil { |
| 108 | + return nil, err |
| 109 | + } |
| 110 | + pub, err := generatePublicKey(pk) |
| 111 | + if err != nil { |
| 112 | + return nil, err |
| 113 | + } |
| 114 | + priv, err := encodePrivateKeyToPEM(pv) |
| 115 | + if err != nil { |
| 116 | + return nil, err |
| 117 | + } |
| 118 | + return &KeyPair{ |
| 119 | + PublicKey: pub, |
| 120 | + PrivateKey: priv, |
| 121 | + }, nil |
| 122 | +} |
| 123 | + |
| 124 | +func generatePublicKey(pk interface{}) ([]byte, error) { |
| 125 | + b, err := ssh.NewPublicKey(pk) |
| 126 | + if err != nil { |
| 127 | + return nil, err |
| 128 | + } |
| 129 | + k := ssh.MarshalAuthorizedKey(b) |
| 130 | + return k, nil |
| 131 | +} |
| 132 | + |
| 133 | +// encodePrivateKeyToPEM encodes the given private key to a PEM block. |
| 134 | +// The encoded format is PKCS#8 for universal support of the most |
| 135 | +// common key types (rsa, ecdsa, ed25519). |
| 136 | +func encodePrivateKeyToPEM(pk interface{}) ([]byte, error) { |
| 137 | + b, err := x509.MarshalPKCS8PrivateKey(pk) |
| 138 | + if err != nil { |
| 139 | + return nil, err |
| 140 | + } |
| 141 | + block := pem.Block{ |
| 142 | + Type: "PRIVATE KEY", |
| 143 | + Bytes: b, |
| 144 | + } |
| 145 | + return pem.EncodeToMemory(&block), nil |
| 146 | +} |
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