This repository has been archived by the owner on Feb 7, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 182
/
aes.ts
226 lines (180 loc) · 5.61 KB
/
aes.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
import { AES_asm, AES_mode } from './aes.asm';
import { _heap_init, _heap_write, is_bytes } from '../other/utils';
import { IllegalArgumentError, SecurityError } from '../other/errors';
export class AES {
public readonly heap: Uint8Array;
public readonly asm: AES_asm;
private readonly mode: string;
public padding: boolean; // TODO: This should be `private readonly`, hacking for AES-CFB?!
public pos: number = 0;
public len: number = 0;
constructor(key: Uint8Array, iv: Uint8Array | undefined, padding = true, mode: AES_mode, heap?: Uint8Array, asm?: AES_asm) {
this.mode = mode;
// The AES "worker"
this.heap = heap ? heap : _heap_init().subarray(AES_asm.HEAP_DATA);
this.asm = asm ? asm : new AES_asm(null, this.heap.buffer);
// The AES object state
this.pos = 0;
this.len = 0;
// Key
const keylen = key.length;
if (keylen !== 16 && keylen !== 24 && keylen !== 32) throw new IllegalArgumentError('illegal key size');
const keyview = new DataView(key.buffer, key.byteOffset, key.byteLength);
this.asm.set_key(
keylen >> 2,
keyview.getUint32(0),
keyview.getUint32(4),
keyview.getUint32(8),
keyview.getUint32(12),
keylen > 16 ? keyview.getUint32(16) : 0,
keylen > 16 ? keyview.getUint32(20) : 0,
keylen > 24 ? keyview.getUint32(24) : 0,
keylen > 24 ? keyview.getUint32(28) : 0,
);
// IV
if (iv !== undefined) {
if (iv.length !== 16) throw new IllegalArgumentError('illegal iv size');
let ivview = new DataView(iv.buffer, iv.byteOffset, iv.byteLength);
this.asm.set_iv(ivview.getUint32(0), ivview.getUint32(4), ivview.getUint32(8), ivview.getUint32(12));
} else {
this.asm.set_iv(0, 0, 0, 0);
}
this.padding = padding;
}
AES_Encrypt_process(data: Uint8Array): Uint8Array {
if (!is_bytes(data)) throw new TypeError("data isn't of expected type");
let asm = this.asm;
let heap = this.heap;
let amode = AES_asm.ENC[this.mode];
let hpos = AES_asm.HEAP_DATA;
let pos = this.pos;
let len = this.len;
let dpos = 0;
let dlen = data.length || 0;
let rpos = 0;
let rlen = (len + dlen) & -16;
let wlen = 0;
let result = new Uint8Array(rlen);
while (dlen > 0) {
wlen = _heap_write(heap, pos + len, data, dpos, dlen);
len += wlen;
dpos += wlen;
dlen -= wlen;
wlen = asm.cipher(amode, hpos + pos, len);
if (wlen) result.set(heap.subarray(pos, pos + wlen), rpos);
rpos += wlen;
if (wlen < len) {
pos += wlen;
len -= wlen;
} else {
pos = 0;
len = 0;
}
}
this.pos = pos;
this.len = len;
return result;
}
AES_Encrypt_finish(): Uint8Array {
let asm = this.asm;
let heap = this.heap;
let amode = AES_asm.ENC[this.mode];
let hpos = AES_asm.HEAP_DATA;
let pos = this.pos;
let len = this.len;
let plen = 16 - (len % 16);
let rlen = len;
if (this.hasOwnProperty('padding')) {
if (this.padding) {
for (let p = 0; p < plen; ++p) {
heap[pos + len + p] = plen;
}
len += plen;
rlen = len;
} else if (len % 16) {
throw new IllegalArgumentError('data length must be a multiple of the block size');
}
} else {
len += plen;
}
const result = new Uint8Array(rlen);
if (len) asm.cipher(amode, hpos + pos, len);
if (rlen) result.set(heap.subarray(pos, pos + rlen));
this.pos = 0;
this.len = 0;
return result;
}
AES_Decrypt_process(data: Uint8Array): Uint8Array {
if (!is_bytes(data)) throw new TypeError("data isn't of expected type");
let asm = this.asm;
let heap = this.heap;
let amode = AES_asm.DEC[this.mode];
let hpos = AES_asm.HEAP_DATA;
let pos = this.pos;
let len = this.len;
let dpos = 0;
let dlen = data.length || 0;
let rpos = 0;
let rlen = (len + dlen) & -16;
let plen = 0;
let wlen = 0;
if (this.padding) {
plen = len + dlen - rlen || 16;
rlen -= plen;
}
const result = new Uint8Array(rlen);
while (dlen > 0) {
wlen = _heap_write(heap, pos + len, data, dpos, dlen);
len += wlen;
dpos += wlen;
dlen -= wlen;
wlen = asm.cipher(amode, hpos + pos, len - (!dlen ? plen : 0));
if (wlen) result.set(heap.subarray(pos, pos + wlen), rpos);
rpos += wlen;
if (wlen < len) {
pos += wlen;
len -= wlen;
} else {
pos = 0;
len = 0;
}
}
this.pos = pos;
this.len = len;
return result;
}
AES_Decrypt_finish(): Uint8Array {
let asm = this.asm;
let heap = this.heap;
let amode = AES_asm.DEC[this.mode];
let hpos = AES_asm.HEAP_DATA;
let pos = this.pos;
let len = this.len;
let rlen = len;
if (len > 0) {
if (len % 16) {
if (this.hasOwnProperty('padding')) {
throw new IllegalArgumentError('data length must be a multiple of the block size');
} else {
len += 16 - (len % 16);
}
}
asm.cipher(amode, hpos + pos, len);
if (this.hasOwnProperty('padding') && this.padding) {
let pad = heap[pos + rlen - 1];
if (pad < 1 || pad > 16 || pad > rlen) throw new SecurityError('bad padding');
let pcheck = 0;
for (let i = pad; i > 1; i--) pcheck |= pad ^ heap[pos + rlen - i];
if (pcheck) throw new SecurityError('bad padding');
rlen -= pad;
}
}
const result = new Uint8Array(rlen);
if (rlen > 0) {
result.set(heap.subarray(pos, pos + rlen));
}
this.pos = 0;
this.len = 0;
return result;
}
}