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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCrypto open source project
//
// Copyright (c) 2023 Apple Inc. and the SwiftCrypto project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.md for the list of SwiftCrypto project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import Foundation
import XCTest
import Crypto
import _CryptoExtras
final class AESBlockFunctionTests: XCTestCase {
static let nistPlaintextChunks: [[UInt8]] = [
try! Array(hexString: "6bc1bee22e409f96e93d7e117393172a"),
try! Array(hexString: "ae2d8a571e03ac9c9eb76fac45af8e51"),
try! Array(hexString: "30c81c46a35ce411e5fbc1191a0a52ef"),
try! Array(hexString: "f69f2445df4f9b17ad2b417be66c3710")
]
func test128BitEncrypt() throws {
let key = SymmetricKey(
data: try! Array(hexString: "2b7e151628aed2a6abf7158809cf4f3c")
)
let encryptedChunks = [
try! Array(hexString: "3ad77bb40d7a3660a89ecaf32466ef97"),
try! Array(hexString: "f5d3d58503b9699de785895a96fdbaaf"),
try! Array(hexString: "43b1cd7f598ece23881b00e3ed030688"),
try! Array(hexString: "7b0c785e27e8ad3f8223207104725dd4")
]
// Fast-path
for (chunk, expected) in zip(Self.nistPlaintextChunks, encryptedChunks) {
var chunk = chunk
try AES.permute(&chunk, key: key)
XCTAssertEqual(chunk, expected)
}
// Slow-path
for (chunk, expected) in zip(Self.nistPlaintextChunks, encryptedChunks) {
var block = Block(wrapped: chunk)
try AES.permute(&block, key: key)
XCTAssertEqual(Array(block.wrapped), expected)
}
}
func test128BitDecrypt() throws {
let key = SymmetricKey(
data: try! Array(hexString: "2b7e151628aed2a6abf7158809cf4f3c")
)
let encryptedChunks = [
try! Array(hexString: "3ad77bb40d7a3660a89ecaf32466ef97"),
try! Array(hexString: "f5d3d58503b9699de785895a96fdbaaf"),
try! Array(hexString: "43b1cd7f598ece23881b00e3ed030688"),
try! Array(hexString: "7b0c785e27e8ad3f8223207104725dd4")
]
// Fast-path
for (chunk, expected) in zip(encryptedChunks, Self.nistPlaintextChunks) {
var chunk = chunk
try AES.inversePermute(&chunk, key: key)
XCTAssertEqual(chunk, expected)
}
// Slow-path
for (chunk, expected) in zip(encryptedChunks, Self.nistPlaintextChunks) {
var block = Block(wrapped: chunk)
try AES.inversePermute(&block, key: key)
XCTAssertEqual(Array(block.wrapped), expected)
}
}
func test192BitEncrypt() throws {
let key = SymmetricKey(
data: try! Array(hexString: "8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b")
)
let encryptedChunks = [
try! Array(hexString: "bd334f1d6e45f25ff712a214571fa5cc"),
try! Array(hexString: "974104846d0ad3ad7734ecb3ecee4eef"),
try! Array(hexString: "ef7afd2270e2e60adce0ba2face6444e"),
try! Array(hexString: "9a4b41ba738d6c72fb16691603c18e0e")
]
// Fast-path
for (chunk, expected) in zip(Self.nistPlaintextChunks, encryptedChunks) {
var chunk = chunk
try AES.permute(&chunk, key: key)
XCTAssertEqual(chunk, expected)
}
// Slow-path
for (chunk, expected) in zip(Self.nistPlaintextChunks, encryptedChunks) {
var block = Block(wrapped: chunk)
try AES.permute(&block, key: key)
XCTAssertEqual(Array(block.wrapped), expected)
}
}
func test192BitDecrypt() throws {
let key = SymmetricKey(
data: try! Array(hexString: "8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b")
)
let encryptedChunks = [
try! Array(hexString: "bd334f1d6e45f25ff712a214571fa5cc"),
try! Array(hexString: "974104846d0ad3ad7734ecb3ecee4eef"),
try! Array(hexString: "ef7afd2270e2e60adce0ba2face6444e"),
try! Array(hexString: "9a4b41ba738d6c72fb16691603c18e0e")
]
// Fast-path
for (chunk, expected) in zip(encryptedChunks, Self.nistPlaintextChunks) {
var chunk = chunk
try AES.inversePermute(&chunk, key: key)
XCTAssertEqual(chunk, expected)
}
// Slow-path
for (chunk, expected) in zip(encryptedChunks, Self.nistPlaintextChunks) {
var block = Block(wrapped: chunk)
try AES.inversePermute(&block, key: key)
XCTAssertEqual(Array(block.wrapped), expected)
}
}
func test256BitEncrypt() throws {
let key = SymmetricKey(
data: try! Array(
hexString: "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"
)
)
let encryptedChunks = [
try! Array(hexString: "f3eed1bdb5d2a03c064b5a7e3db181f8"),
try! Array(hexString: "591ccb10d410ed26dc5ba74a31362870"),
try! Array(hexString: "b6ed21b99ca6f4f9f153e7b1beafed1d"),
try! Array(hexString: "23304b7a39f9f3ff067d8d8f9e24ecc7")
]
// Fast-path
for (chunk, expected) in zip(Self.nistPlaintextChunks, encryptedChunks) {
var chunk = chunk
try AES.permute(&chunk, key: key)
XCTAssertEqual(chunk, expected)
}
// Slow-path
for (chunk, expected) in zip(Self.nistPlaintextChunks, encryptedChunks) {
var block = Block(wrapped: chunk)
try AES.permute(&block, key: key)
XCTAssertEqual(Array(block.wrapped), expected)
}
}
func test256BitDecrypt() throws {
let key = SymmetricKey(
data: try! Array(
hexString: "603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"
)
)
let encryptedChunks = [
try! Array(hexString: "f3eed1bdb5d2a03c064b5a7e3db181f8"),
try! Array(hexString: "591ccb10d410ed26dc5ba74a31362870"),
try! Array(hexString: "b6ed21b99ca6f4f9f153e7b1beafed1d"),
try! Array(hexString: "23304b7a39f9f3ff067d8d8f9e24ecc7")
]
// Fast-path
for (chunk, expected) in zip(encryptedChunks, Self.nistPlaintextChunks) {
var chunk = chunk
try AES.inversePermute(&chunk, key: key)
XCTAssertEqual(chunk, expected)
}
// Slow-path
for (chunk, expected) in zip(encryptedChunks, Self.nistPlaintextChunks) {
var block = Block(wrapped: chunk)
try AES.inversePermute(&block, key: key)
XCTAssertEqual(Array(block.wrapped), expected)
}
}
func testRejectInvalidBlockSizes() throws {
let key = SymmetricKey(size: .bits128)
for blockSize in 0..<32 {
if blockSize == 16 { continue }
var chunk = Array(repeating: UInt8(0), count: blockSize)
// Fast-path
XCTAssertThrowsError(try AES.permute(&chunk, key: key))
XCTAssertThrowsError(try AES.inversePermute(&chunk, key: key))
// Slow-path
var block = Block(wrapped: chunk)
XCTAssertThrowsError(try AES.permute(&block, key: key))
XCTAssertThrowsError(try AES.inversePermute(&block, key: key))
}
}
func testRejectsInvalidKeySizes() throws {
var chunk = Array(repeating: UInt8(0), count: 16)
for keySizeInBits in stride(from: 128, through: 256, by: 8) {
if [128, 192, 256].contains(keySizeInBits) { continue }
let key = SymmetricKey(size: .init(bitCount: keySizeInBits))
// Fast-path
XCTAssertThrowsError(try AES.permute(&chunk, key: key))
XCTAssertThrowsError(try AES.inversePermute(&chunk, key: key))
// Slow-path
var block = Block(wrapped: chunk)
XCTAssertThrowsError(try AES.permute(&block, key: key))
XCTAssertThrowsError(try AES.inversePermute(&block, key: key))
}
}
}
// We use this for testing. Specifically, there's a slow path in the code
// which ArraySlice and Data will not hit (for Collections that don't implement
// withContiguousMutableStorageIfAvailable). This is a simple Collection that wraps
// an ArraySlice but does not expose that method, so hits the slow path.
struct Block: MutableCollection {
var wrapped: ArraySlice<UInt8>
init(wrapped: ArraySlice<UInt8>) {
self.wrapped = wrapped
}
init(wrapped: [UInt8]) {
self.wrapped = wrapped[...]
}
var startIndex: Int { wrapped.startIndex }
var endIndex: Int { wrapped.endIndex }
func index(after index: Int) -> Int {
return index + 1
}
subscript(position: Int) -> UInt8 {
get {
self.wrapped[position]
}
set {
self.wrapped[position] = newValue
}
}
}
|
