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
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
|
/** @file
AES Wrapper Implementation over OpenSSL.
Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "InternalCryptLib.h"
#include <openssl/aes.h>
/**
Retrieves the size, in bytes, of the context buffer required for AES operations.
@return The size, in bytes, of the context buffer required for AES operations.
**/
UINTN
EFIAPI
AesGetContextSize (
VOID
)
{
//
// AES uses different key contexts for encryption and decryption, so here memory
// for 2 copies of AES_KEY is allocated.
//
return (UINTN) (2 * sizeof (AES_KEY));
}
/**
Initializes user-supplied memory as AES context for subsequent use.
This function initializes user-supplied memory pointed by AesContext as AES context.
In addtion, it sets up all AES key materials for subsequent encryption and decryption
operations.
There are 3 options for key length, 128 bits, 192 bits, and 256 bits.
If AesContext is NULL, then ASSERT().
If Key is NULL, then ASSERT().
If KeyLength is not valid, then ASSERT().
@param[out] AesContext Pointer to AES context being initialized.
@param[in] Key Pointer to the user-supplied AES key.
@param[in] KeyLength Length of AES key in bits.
@retval TRUE AES context initialization succeeded.
@retval FALSE AES context initialization failed.
**/
BOOLEAN
EFIAPI
AesInit (
OUT VOID *AesContext,
IN CONST UINT8 *Key,
IN UINTN KeyLength
)
{
AES_KEY *AesKey;
ASSERT (AesContext != NULL);
//
// AES Key Checking
//
ASSERT (Key != NULL);
ASSERT ((KeyLength == 128) || (KeyLength == 192) || (KeyLength == 256));
//
// Initialize AES encryption & decryption key schedule.
//
AesKey = (AES_KEY *) AesContext;
if (AES_set_encrypt_key (Key, (UINT32) KeyLength, AesKey) != 0) {
return FALSE;
}
if (AES_set_decrypt_key (Key, (UINT32) KeyLength, AesKey + 1) != 0) {
return FALSE;
}
return TRUE;
}
/**
Performs AES encryption on a data buffer of the specified size in ECB mode.
This function performs AES encryption on data buffer pointed by Input, of specified
size of InputSize, in ECB mode.
InputSize must be multiple of block size (16 bytes). This function does not perform
padding. Caller must perform padding, if necessary, to ensure valid input data size.
AesContext should be already correctly initialized by AesInit(). Behavior with
invalid AES context is undefined.
If AesContext is NULL, then ASSERT().
If Input is NULL, then ASSERT().
If InputSize is not multiple of block size (16 bytes), then ASSERT().
If Output is NULL, then ASSERT().
@param[in] AesContext Pointer to the AES context.
@param[in] Input Pointer to the buffer containing the data to be encrypted.
@param[in] InputSize Size of the Input buffer in bytes.
@param[out] Output Pointer to a buffer that receives the AES encryption output.
@retval TRUE AES encryption succeeded.
@retval FALSE AES encryption failed.
**/
BOOLEAN
EFIAPI
AesEcbEncrypt (
IN VOID *AesContext,
IN CONST UINT8 *Input,
IN UINTN InputSize,
OUT UINT8 *Output
)
{
AES_KEY *AesKey;
ASSERT (AesContext != NULL);
ASSERT (Input != NULL);
ASSERT ((InputSize % AES_BLOCK_SIZE) == 0);
ASSERT (Output != NULL);
AesKey = (AES_KEY *) AesContext;
//
// Perform AES data encryption with ECB mode (block-by-block)
//
while (InputSize > 0) {
AES_ecb_encrypt (Input, Output, AesKey, AES_ENCRYPT);
Input += AES_BLOCK_SIZE;
Output += AES_BLOCK_SIZE;
InputSize -= AES_BLOCK_SIZE;
}
return TRUE;
}
/**
Performs AES decryption on a data buffer of the specified size in ECB mode.
This function performs AES decryption on data buffer pointed by Input, of specified
size of InputSize, in ECB mode.
InputSize must be multiple of block size (16 bytes). This function does not perform
padding. Caller must perform padding, if necessary, to ensure valid input data size.
AesContext should be already correctly initialized by AesInit(). Behavior with
invalid AES context is undefined.
If AesContext is NULL, then ASSERT().
If Input is NULL, then ASSERT().
If InputSize is not multiple of block size (16 bytes), then ASSERT().
If Output is NULL, then ASSERT().
@param[in] AesContext Pointer to the AES context.
@param[in] Input Pointer to the buffer containing the data to be decrypted.
@param[in] InputSize Size of the Input buffer in bytes.
@param[out] Output Pointer to a buffer that receives the AES decryption output.
@retval TRUE AES decryption succeeded.
@retval FALSE AES decryption failed.
**/
BOOLEAN
EFIAPI
AesEcbDecrypt (
IN VOID *AesContext,
IN CONST UINT8 *Input,
IN UINTN InputSize,
OUT UINT8 *Output
)
{
AES_KEY *AesKey;
ASSERT (AesContext != NULL);
ASSERT (Input != NULL);
ASSERT ((InputSize % AES_BLOCK_SIZE) == 0);
ASSERT (Output != NULL);
AesKey = (AES_KEY *) AesContext;
//
// Perform AES data decryption with ECB mode (block-by-block)
//
while (InputSize > 0) {
AES_ecb_encrypt (Input, Output, AesKey + 1, AES_DECRYPT);
Input += AES_BLOCK_SIZE;
Output += AES_BLOCK_SIZE;
InputSize -= AES_BLOCK_SIZE;
}
return TRUE;
}
/**
Performs AES encryption on a data buffer of the specified size in CBC mode.
This function performs AES encryption on data buffer pointed by Input, of specified
size of InputSize, in CBC mode.
InputSize must be multiple of block size (16 bytes). This function does not perform
padding. Caller must perform padding, if necessary, to ensure valid input data size.
Initialization vector should be one block size (16 bytes).
AesContext should be already correctly initialized by AesInit(). Behavior with
invalid AES context is undefined.
If AesContext is NULL, then ASSERT().
If Input is NULL, then ASSERT().
If InputSize is not multiple of block size (16 bytes), then ASSERT().
If Ivec is NULL, then ASSERT().
If Output is NULL, then ASSERT().
@param[in] AesContext Pointer to the AES context.
@param[in] Input Pointer to the buffer containing the data to be encrypted.
@param[in] InputSize Size of the Input buffer in bytes.
@param[in] Ivec Pointer to initialization vector.
@param[out] Output Pointer to a buffer that receives the AES encryption output.
@retval TRUE AES encryption succeeded.
@retval FALSE AES encryption failed.
**/
BOOLEAN
EFIAPI
AesCbcEncrypt (
IN VOID *AesContext,
IN CONST UINT8 *Input,
IN UINTN InputSize,
IN CONST UINT8 *Ivec,
OUT UINT8 *Output
)
{
AES_KEY *AesKey;
UINT8 IvecBuffer[AES_BLOCK_SIZE];
ASSERT (AesContext != NULL);
ASSERT (Input != NULL);
ASSERT ((InputSize % AES_BLOCK_SIZE) == 0);
ASSERT (Ivec != NULL);
ASSERT (Output != NULL);
AesKey = (AES_KEY *) AesContext;
CopyMem (IvecBuffer, Ivec, AES_BLOCK_SIZE);
//
// Perform AES data encryption with CBC mode
//
AES_cbc_encrypt (Input, Output, (UINT32) InputSize, AesKey, IvecBuffer, AES_ENCRYPT);
return TRUE;
}
/**
Performs AES decryption on a data buffer of the specified size in CBC mode.
This function performs AES decryption on data buffer pointed by Input, of specified
size of InputSize, in CBC mode.
InputSize must be multiple of block size (16 bytes). This function does not perform
padding. Caller must perform padding, if necessary, to ensure valid input data size.
Initialization vector should be one block size (16 bytes).
AesContext should be already correctly initialized by AesInit(). Behavior with
invalid AES context is undefined.
If AesContext is NULL, then ASSERT().
If Input is NULL, then ASSERT().
If InputSize is not multiple of block size (16 bytes), then ASSERT().
If Ivec is NULL, then ASSERT().
If Output is NULL, then ASSERT().
@param[in] AesContext Pointer to the AES context.
@param[in] Input Pointer to the buffer containing the data to be encrypted.
@param[in] InputSize Size of the Input buffer in bytes.
@param[in] Ivec Pointer to initialization vector.
@param[out] Output Pointer to a buffer that receives the AES encryption output.
@retval TRUE AES decryption succeeded.
@retval FALSE AES decryption failed.
**/
BOOLEAN
EFIAPI
AesCbcDecrypt (
IN VOID *AesContext,
IN CONST UINT8 *Input,
IN UINTN InputSize,
IN CONST UINT8 *Ivec,
OUT UINT8 *Output
)
{
AES_KEY *AesKey;
UINT8 IvecBuffer[AES_BLOCK_SIZE];
ASSERT (AesContext != NULL);
ASSERT (Input != NULL);
ASSERT ((InputSize % AES_BLOCK_SIZE) == 0);
ASSERT (Ivec != NULL);
ASSERT (Output != NULL);
AesKey = (AES_KEY *) AesContext;
CopyMem (IvecBuffer, Ivec, AES_BLOCK_SIZE);
//
// Perform AES data decryption with CBC mode
//
AES_cbc_encrypt (Input, Output, (UINT32) InputSize, AesKey + 1, IvecBuffer, AES_DECRYPT);
return TRUE;
}
|
