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
|
/* SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0)
*
* Copyright 2008-2016 Freescale Semiconductor Inc.
* Copyright 2016 NXP
*
*/
#ifndef __RTA_KEY_CMD_H__
#define __RTA_KEY_CMD_H__
extern enum rta_sec_era rta_sec_era;
/* Allowed encryption flags for each SEC Era */
static const uint32_t key_enc_flags[] = {
ENC,
ENC | NWB | EKT | TK,
ENC | NWB | EKT | TK,
ENC | NWB | EKT | TK,
ENC | NWB | EKT | TK,
ENC | NWB | EKT | TK,
ENC | NWB | EKT | TK | PTS,
ENC | NWB | EKT | TK | PTS
};
static inline int
rta_key(struct program *program, uint32_t key_dst,
uint32_t encrypt_flags, uint64_t src, uint32_t length,
uint32_t flags)
{
uint32_t opcode = 0;
bool is_seq_cmd = false;
unsigned int start_pc = program->current_pc;
if (encrypt_flags & ~key_enc_flags[rta_sec_era]) {
pr_err("KEY: Flag(s) not supported by SEC Era %d\n",
USER_SEC_ERA(rta_sec_era));
goto err;
}
/* write cmd type */
if (flags & SEQ) {
opcode = CMD_SEQ_KEY;
is_seq_cmd = true;
} else {
opcode = CMD_KEY;
}
/* check parameters */
if (is_seq_cmd) {
if ((flags & IMMED) || (flags & SGF)) {
pr_err("SEQKEY: Invalid flag. SEC PC: %d; Instr: %d\n",
program->current_pc,
program->current_instruction);
goto err;
}
if ((rta_sec_era <= RTA_SEC_ERA_5) &&
((flags & VLF) || (flags & AIDF))) {
pr_err("SEQKEY: Flag(s) not supported by SEC Era %d\n",
USER_SEC_ERA(rta_sec_era));
goto err;
}
} else {
if ((flags & AIDF) || (flags & VLF)) {
pr_err("KEY: Invalid flag. SEC PC: %d; Instr: %d\n",
program->current_pc,
program->current_instruction);
goto err;
}
if ((flags & SGF) && (flags & IMMED)) {
pr_err("KEY: Invalid flag. SEC PC: %d; Instr: %d\n",
program->current_pc,
program->current_instruction);
goto err;
}
}
if ((encrypt_flags & PTS) &&
((encrypt_flags & ENC) || (encrypt_flags & NWB) ||
(key_dst == PKE))) {
pr_err("KEY: Invalid flag / destination. SEC PC: %d; Instr: %d\n",
program->current_pc, program->current_instruction);
goto err;
}
if (key_dst == AFHA_SBOX) {
if (rta_sec_era == RTA_SEC_ERA_7) {
pr_err("KEY: AFHA S-box not supported by SEC Era %d\n",
USER_SEC_ERA(rta_sec_era));
goto err;
}
if (flags & IMMED) {
pr_err("KEY: Invalid flag. SEC PC: %d; Instr: %d\n",
program->current_pc,
program->current_instruction);
goto err;
}
/*
* Sbox data loaded into the ARC-4 processor must be exactly
* 258 bytes long, or else a data sequence error is generated.
*/
if (length != 258) {
pr_err("KEY: Invalid length. SEC PC: %d; Instr: %d\n",
program->current_pc,
program->current_instruction);
goto err;
}
}
/* write key destination and class fields */
switch (key_dst) {
case (KEY1):
opcode |= KEY_DEST_CLASS1;
break;
case (KEY2):
opcode |= KEY_DEST_CLASS2;
break;
case (PKE):
opcode |= KEY_DEST_CLASS1 | KEY_DEST_PKHA_E;
break;
case (AFHA_SBOX):
opcode |= KEY_DEST_CLASS1 | KEY_DEST_AFHA_SBOX;
break;
case (MDHA_SPLIT_KEY):
opcode |= KEY_DEST_CLASS2 | KEY_DEST_MDHA_SPLIT;
break;
default:
pr_err("KEY: Invalid destination. SEC PC: %d; Instr: %d\n",
program->current_pc, program->current_instruction);
goto err;
}
/* write key length */
length &= KEY_LENGTH_MASK;
opcode |= length;
/* write key command specific flags */
if (encrypt_flags & ENC) {
/* Encrypted (black) keys must be padded to 8 bytes (CCM) or
* 16 bytes (ECB) depending on EKT bit. AES-CCM encrypted keys
* (EKT = 1) have 6-byte nonce and 6-byte MAC after padding.
*/
opcode |= KEY_ENC;
if (encrypt_flags & EKT) {
opcode |= KEY_EKT;
length = ALIGN(length, 8);
length += 12;
} else {
length = ALIGN(length, 16);
}
if (encrypt_flags & TK)
opcode |= KEY_TK;
}
if (encrypt_flags & NWB)
opcode |= KEY_NWB;
if (encrypt_flags & PTS)
opcode |= KEY_PTS;
/* write general command flags */
if (!is_seq_cmd) {
if (flags & IMMED)
opcode |= KEY_IMM;
if (flags & SGF)
opcode |= KEY_SGF;
} else {
if (flags & AIDF)
opcode |= KEY_AIDF;
if (flags & VLF)
opcode |= KEY_VLF;
}
__rta_out32(program, opcode);
program->current_instruction++;
if (flags & IMMED)
__rta_inline_data(program, src, flags & __COPY_MASK, length);
else
__rta_out64(program, program->ps, src);
return (int)start_pc;
err:
program->first_error_pc = start_pc;
program->current_instruction++;
return -EINVAL;
}
#endif /* __RTA_KEY_CMD_H__ */
|
