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
|
// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2014-2019, Linaro Limited
*/
#include <crypto/crypto.h>
#include <stdlib.h>
#include <string.h>
#include <tee_api_types.h>
#include <tee/tee_cryp_utl.h>
#include <trace.h>
#include <utee_defines.h>
#include "acipher_helpers.h"
TEE_Result crypto_acipher_alloc_dsa_keypair(struct dsa_keypair *s,
size_t key_size_bits __unused)
{
memset(s, 0, sizeof(*s));
if (!bn_alloc_max(&s->g))
return TEE_ERROR_OUT_OF_MEMORY;
if (!bn_alloc_max(&s->p))
goto err;
if (!bn_alloc_max(&s->q))
goto err;
if (!bn_alloc_max(&s->y))
goto err;
if (!bn_alloc_max(&s->x))
goto err;
return TEE_SUCCESS;
err:
crypto_bignum_free(&s->g);
crypto_bignum_free(&s->p);
crypto_bignum_free(&s->q);
crypto_bignum_free(&s->y);
return TEE_ERROR_OUT_OF_MEMORY;
}
TEE_Result crypto_acipher_alloc_dsa_public_key(struct dsa_public_key *s,
size_t key_size_bits __unused)
{
memset(s, 0, sizeof(*s));
if (!bn_alloc_max(&s->g))
return TEE_ERROR_OUT_OF_MEMORY;
if (!bn_alloc_max(&s->p))
goto err;
if (!bn_alloc_max(&s->q))
goto err;
if (!bn_alloc_max(&s->y))
goto err;
return TEE_SUCCESS;
err:
crypto_bignum_free(&s->g);
crypto_bignum_free(&s->p);
crypto_bignum_free(&s->q);
return TEE_ERROR_OUT_OF_MEMORY;
}
TEE_Result crypto_acipher_gen_dsa_key(struct dsa_keypair *key, size_t key_size)
{
dsa_key ltc_tmp_key = { };
int ltc_res = 0;
if (key_size != 8 * mp_unsigned_bin_size(key->p))
return TEE_ERROR_BAD_PARAMETERS;
ltc_res = mp_init_multi(<c_tmp_key.g, <c_tmp_key.p, <c_tmp_key.q,
<c_tmp_key.x, <c_tmp_key.y, NULL);
if (ltc_res)
return TEE_ERROR_OUT_OF_MEMORY;
/* Copy the key parameters */
mp_copy(key->g, ltc_tmp_key.g);
mp_copy(key->p, ltc_tmp_key.p);
mp_copy(key->q, ltc_tmp_key.q);
/* Generate the DSA key */
ltc_res = dsa_generate_key(NULL, find_prng("prng_crypto"),
<c_tmp_key);
if (ltc_res)
return TEE_ERROR_BAD_PARAMETERS;
/* Copy the key */
mp_copy(ltc_tmp_key.y, key->y);
mp_copy(ltc_tmp_key.x, key->x);
/* Free the temporary key */
dsa_free(<c_tmp_key);
return TEE_SUCCESS;
}
TEE_Result crypto_acipher_dsa_sign(uint32_t algo, struct dsa_keypair *key,
const uint8_t *msg, size_t msg_len,
uint8_t *sig, size_t *sig_len)
{
TEE_Result res;
size_t hash_size;
int ltc_res;
void *r, *s;
dsa_key ltc_key = {
.type = PK_PRIVATE,
.qord = mp_unsigned_bin_size(key->q),
.g = key->g,
.p = key->p,
.q = key->q,
.y = key->y,
.x = key->x,
};
if (algo != TEE_ALG_DSA_SHA1 &&
algo != TEE_ALG_DSA_SHA224 &&
algo != TEE_ALG_DSA_SHA256) {
res = TEE_ERROR_NOT_IMPLEMENTED;
goto err;
}
res = tee_alg_get_digest_size(TEE_DIGEST_HASH_TO_ALGO(algo),
&hash_size);
if (res != TEE_SUCCESS)
goto err;
if (mp_unsigned_bin_size(ltc_key.q) < hash_size)
hash_size = mp_unsigned_bin_size(ltc_key.q);
if (msg_len != hash_size) {
res = TEE_ERROR_SECURITY;
goto err;
}
if (*sig_len < 2 * mp_unsigned_bin_size(ltc_key.q)) {
*sig_len = 2 * mp_unsigned_bin_size(ltc_key.q);
res = TEE_ERROR_SHORT_BUFFER;
goto err;
}
ltc_res = mp_init_multi(&r, &s, NULL);
if (ltc_res != CRYPT_OK) {
res = TEE_ERROR_OUT_OF_MEMORY;
goto err;
}
ltc_res = dsa_sign_hash_raw(msg, msg_len, r, s, NULL,
find_prng("prng_crypto"), <c_key);
if (ltc_res == CRYPT_OK) {
*sig_len = 2 * mp_unsigned_bin_size(ltc_key.q);
memset(sig, 0, *sig_len);
mp_to_unsigned_bin(r, (uint8_t *)sig + *sig_len/2 -
mp_unsigned_bin_size(r));
mp_to_unsigned_bin(s, (uint8_t *)sig + *sig_len -
mp_unsigned_bin_size(s));
res = TEE_SUCCESS;
} else {
res = TEE_ERROR_GENERIC;
}
mp_clear_multi(r, s, NULL);
err:
return res;
}
TEE_Result crypto_acipher_dsa_verify(uint32_t algo, struct dsa_public_key *key,
const uint8_t *msg, size_t msg_len,
const uint8_t *sig, size_t sig_len)
{
TEE_Result res;
int ltc_stat, ltc_res;
void *r, *s;
dsa_key ltc_key = {
.type = PK_PUBLIC,
.qord = mp_unsigned_bin_size(key->q),
.g = key->g,
.p = key->p,
.q = key->q,
.y = key->y
};
if (algo != TEE_ALG_DSA_SHA1 &&
algo != TEE_ALG_DSA_SHA224 &&
algo != TEE_ALG_DSA_SHA256) {
res = TEE_ERROR_NOT_IMPLEMENTED;
goto err;
}
ltc_res = mp_init_multi(&r, &s, NULL);
if (ltc_res != CRYPT_OK) {
res = TEE_ERROR_OUT_OF_MEMORY;
goto err;
}
mp_read_unsigned_bin(r, (uint8_t *)sig, sig_len/2);
mp_read_unsigned_bin(s, (uint8_t *)sig + sig_len/2, sig_len/2);
ltc_res = dsa_verify_hash_raw(r, s, msg, msg_len, <c_stat, <c_key);
mp_clear_multi(r, s, NULL);
res = convert_ltc_verify_status(ltc_res, ltc_stat);
err:
return res;
}
|
