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Encapsulate SSH key helpers in useSshKeys hook
+102
-98
+102
-98
apps/web/src/hooks/useSshKeys.ts
+102
-98
apps/web/src/hooks/useSshKeys.ts
···
6
6
seedBase64: string;
7
7
};
8
8
9
-
function u32(n: number): Uint8Array {
10
-
return new Uint8Array([
11
-
(n >>> 24) & 0xff,
12
-
(n >>> 16) & 0xff,
13
-
(n >>> 8) & 0xff,
14
-
n & 0xff,
15
-
]);
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}
17
-
18
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function concatBytes(...arrays: Uint8Array[]): Uint8Array {
19
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const total = arrays.reduce((sum, arr) => sum + arr.length, 0);
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const out = new Uint8Array(total);
21
-
let offset = 0;
22
-
23
-
for (const arr of arrays) {
24
-
out.set(arr, offset);
25
-
offset += arr.length;
9
+
export function useSshKeys() {
10
+
function u32(n: number): Uint8Array {
11
+
return new Uint8Array([
12
+
(n >>> 24) & 0xff,
13
+
(n >>> 16) & 0xff,
14
+
(n >>> 8) & 0xff,
15
+
n & 0xff,
16
+
]);
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17
}
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18
28
-
return out;
29
-
}
19
+
function concatBytes(...arrays: Uint8Array[]): Uint8Array {
20
+
const total = arrays.reduce((sum, arr) => sum + arr.length, 0);
21
+
const out = new Uint8Array(total);
22
+
let offset = 0;
30
23
31
-
function sshString(bytes: Uint8Array): Uint8Array {
32
-
return concatBytes(u32(bytes.length), bytes);
33
-
}
24
+
for (const arr of arrays) {
25
+
out.set(arr, offset);
26
+
offset += arr.length;
27
+
}
34
28
35
-
function text(value: string): Uint8Array {
36
-
return new TextEncoder().encode(value);
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-
}
29
+
return out;
30
+
}
38
31
39
-
function randomU32(): number {
40
-
const buf = new Uint32Array(1);
41
-
crypto.getRandomValues(buf);
42
-
return buf[0]!;
43
-
}
32
+
function sshString(bytes: Uint8Array): Uint8Array {
33
+
return concatBytes(u32(bytes.length), bytes);
34
+
}
44
35
45
-
function wrapPem(label: string, bytes: Uint8Array): string {
46
-
const base64 = btoa(String.fromCharCode(...bytes));
47
-
const lines = base64.match(/.{1,70}/g)?.join("\n") ?? base64;
48
-
return `-----BEGIN ${label}-----\n${lines}\n-----END ${label}-----`;
49
-
}
36
+
function text(value: string): Uint8Array {
37
+
return new TextEncoder().encode(value);
38
+
}
50
39
51
-
function buildEd25519PublicKeyBlob(publicKey: Uint8Array): Uint8Array {
52
-
return concatBytes(sshString(text("ssh-ed25519")), sshString(publicKey));
53
-
}
40
+
function randomU32(): number {
41
+
const buf = new Uint32Array(1);
42
+
crypto.getRandomValues(buf);
43
+
return buf[0]!;
44
+
}
54
45
55
-
function buildOpenSSHEd25519PrivateKey(
56
-
publicKey: Uint8Array,
57
-
secretKey64: Uint8Array, // must be seed(32) || publicKey(32)
58
-
comment: string,
59
-
): string {
60
-
if (publicKey.length !== 32) {
61
-
throw new Error("Invalid Ed25519 public key length");
46
+
function wrapPem(label: string, bytes: Uint8Array): string {
47
+
const base64 = btoa(String.fromCharCode(...bytes));
48
+
const lines = base64.match(/.{1,70}/g)?.join("\n") ?? base64;
49
+
return `-----BEGIN ${label}-----\n${lines}\n-----END ${label}-----`;
62
50
}
63
51
64
-
if (secretKey64.length !== 64) {
65
-
throw new Error("Invalid Ed25519 secret key length");
52
+
function buildEd25519PublicKeyBlob(publicKey: Uint8Array): Uint8Array {
53
+
return concatBytes(sshString(text("ssh-ed25519")), sshString(publicKey));
66
54
}
67
55
68
-
const publicBlob = buildEd25519PublicKeyBlob(publicKey);
69
-
const checkint = randomU32();
70
-
const commentBytes = text(comment);
56
+
function buildOpenSSHEd25519PrivateKey(
57
+
publicKey: Uint8Array,
58
+
secretKey64: Uint8Array, // must be seed(32) || publicKey(32)
59
+
comment: string,
60
+
): string {
61
+
if (publicKey.length !== 32) {
62
+
throw new Error("Invalid Ed25519 public key length");
63
+
}
71
64
72
-
const privateSectionWithoutPadding = concatBytes(
73
-
u32(checkint),
74
-
u32(checkint),
75
-
sshString(text("ssh-ed25519")),
76
-
sshString(publicKey),
77
-
sshString(secretKey64),
78
-
sshString(commentBytes),
79
-
);
65
+
if (secretKey64.length !== 64) {
66
+
throw new Error("Invalid Ed25519 secret key length");
67
+
}
80
68
81
-
const blockSize = 8;
82
-
const remainder = privateSectionWithoutPadding.length % blockSize;
83
-
const padLen = remainder === 0 ? 0 : blockSize - remainder;
69
+
const publicBlob = buildEd25519PublicKeyBlob(publicKey);
70
+
const checkint = randomU32();
71
+
const commentBytes = text(comment);
84
72
85
-
const padding = new Uint8Array(padLen);
86
-
for (let i = 0; i < padLen; i++) {
87
-
padding[i] = i + 1;
88
-
}
73
+
const privateSectionWithoutPadding = concatBytes(
74
+
u32(checkint),
75
+
u32(checkint),
76
+
sshString(text("ssh-ed25519")),
77
+
sshString(publicKey),
78
+
sshString(secretKey64),
79
+
sshString(commentBytes),
80
+
);
89
81
90
-
const privateSection = concatBytes(privateSectionWithoutPadding, padding);
82
+
const blockSize = 8;
83
+
const remainder = privateSectionWithoutPadding.length % blockSize;
84
+
const padLen = remainder === 0 ? 0 : blockSize - remainder;
91
85
92
-
const opensshKey = concatBytes(
93
-
text("openssh-key-v1\0"),
94
-
sshString(text("none")), // ciphername
95
-
sshString(text("none")), // kdfname
96
-
sshString(new Uint8Array()), // kdfoptions
97
-
u32(1), // number of keys
98
-
sshString(publicBlob), // public key
99
-
sshString(privateSection), // private section
100
-
);
86
+
const padding = new Uint8Array(padLen);
87
+
for (let i = 0; i < padLen; i++) {
88
+
padding[i] = i + 1;
89
+
}
101
90
102
-
return wrapPem("OPENSSH PRIVATE KEY", opensshKey);
103
-
}
91
+
const privateSection = concatBytes(privateSectionWithoutPadding, padding);
104
92
105
-
export async function generateEd25519SSHKeyPair(
106
-
comment = "user@browser",
107
-
): Promise<SSHKeyPair> {
108
-
await sodium.ready;
93
+
const opensshKey = concatBytes(
94
+
text("openssh-key-v1\0"),
95
+
sshString(text("none")), // ciphername
96
+
sshString(text("none")), // kdfname
97
+
sshString(new Uint8Array()), // kdfoptions
98
+
u32(1), // number of keys
99
+
sshString(publicBlob), // public key
100
+
sshString(privateSection), // private section
101
+
);
109
102
110
-
const seed = new Uint8Array(32);
111
-
crypto.getRandomValues(seed);
103
+
return wrapPem("OPENSSH PRIVATE KEY", opensshKey);
104
+
}
112
105
113
-
const kp = sodium.crypto_sign_seed_keypair(seed);
106
+
async function generateEd25519SSHKeyPair(
107
+
comment = "user@browser",
108
+
): Promise<SSHKeyPair> {
109
+
await sodium.ready;
114
110
115
-
const publicKey = new Uint8Array(kp.publicKey);
111
+
const seed = new Uint8Array(32);
112
+
crypto.getRandomValues(seed);
116
113
117
-
const secretKey64 = concatBytes(seed, publicKey);
114
+
const kp = sodium.crypto_sign_seed_keypair(seed);
118
115
119
-
const publicBlob = buildEd25519PublicKeyBlob(publicKey);
116
+
const publicKey = new Uint8Array(kp.publicKey);
120
117
121
-
const publicKeyOpenSSH = `ssh-ed25519 ${sodium.to_base64(publicBlob, sodium.base64_variants.ORIGINAL)} ${comment}`;
118
+
const secretKey64 = concatBytes(seed, publicKey);
122
119
123
-
const privateKeyOpenSSH = buildOpenSSHEd25519PrivateKey(
124
-
publicKey,
125
-
secretKey64,
126
-
comment,
127
-
);
120
+
const publicBlob = buildEd25519PublicKeyBlob(publicKey);
121
+
122
+
const publicKeyOpenSSH = `ssh-ed25519 ${sodium.to_base64(publicBlob, sodium.base64_variants.ORIGINAL)} ${comment}`;
123
+
124
+
const privateKeyOpenSSH = buildOpenSSHEd25519PrivateKey(
125
+
publicKey,
126
+
secretKey64,
127
+
comment,
128
+
);
129
+
130
+
return {
131
+
publicKey: publicKeyOpenSSH,
132
+
privateKey: privateKeyOpenSSH,
133
+
seedBase64: sodium.to_base64(seed, sodium.base64_variants.ORIGINAL),
134
+
};
135
+
}
128
136
129
-
return {
130
-
publicKey: publicKeyOpenSSH,
131
-
privateKey: privateKeyOpenSSH,
132
-
seedBase64: sodium.to_base64(seed, sodium.base64_variants.ORIGINAL),
133
-
};
137
+
return { generateEd25519SSHKeyPair };
134
138
}