1 // SPDX-License-Identifier: BSD-2-Clause
2 /*
3 * Copyright (C) 2018, ARM Limited
4 * Copyright (C) 2019, Linaro Limited
5 */
6
7 #include <assert.h>
8 #include <compiler.h>
9 #include <crypto/crypto.h>
10 #include <crypto/crypto_impl.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <string_ext.h>
14 #include <tee_api_types.h>
15 #include <utee_defines.h>
16 #include <util.h>
17
18 #include "sm3.h"
19
20 struct sm3_hmac_ctx {
21 struct crypto_mac_ctx mac_ctx;
22 struct sm3_context sm3_ctx;
23 };
24
25 static const struct crypto_mac_ops sm3_hmac_ops;
26
to_hmac_ctx(struct crypto_mac_ctx * ctx)27 static struct sm3_hmac_ctx *to_hmac_ctx(struct crypto_mac_ctx *ctx)
28 {
29 assert(ctx && ctx->ops == &sm3_hmac_ops);
30
31 return container_of(ctx, struct sm3_hmac_ctx, mac_ctx);
32 }
33
op_sm3_hmac_init(struct crypto_mac_ctx * ctx,const uint8_t * key,size_t len)34 static TEE_Result op_sm3_hmac_init(struct crypto_mac_ctx *ctx,
35 const uint8_t *key, size_t len)
36 {
37 sm3_hmac_init(&to_hmac_ctx(ctx)->sm3_ctx, key, len);
38
39 return TEE_SUCCESS;
40 }
41
op_sm3_hmac_update(struct crypto_mac_ctx * ctx,const uint8_t * data,size_t len)42 static TEE_Result op_sm3_hmac_update(struct crypto_mac_ctx *ctx,
43 const uint8_t *data, size_t len)
44 {
45 sm3_hmac_update(&to_hmac_ctx(ctx)->sm3_ctx, data, len);
46
47 return TEE_SUCCESS;
48 }
49
op_sm3_hmac_final(struct crypto_mac_ctx * ctx,uint8_t * digest,size_t len)50 static TEE_Result op_sm3_hmac_final(struct crypto_mac_ctx *ctx, uint8_t *digest,
51 size_t len)
52 {
53 struct sm3_hmac_ctx *c = to_hmac_ctx(ctx);
54 size_t hmac_size = TEE_SM3_HASH_SIZE;
55 uint8_t block_digest[TEE_SM3_HASH_SIZE] = { 0 };
56 uint8_t *tmp_digest = NULL;
57
58 if (len == 0)
59 return TEE_ERROR_BAD_PARAMETERS;
60
61 if (hmac_size > len)
62 tmp_digest = block_digest; /* use a tempory buffer */
63 else
64 tmp_digest = digest;
65
66 sm3_hmac_final(&c->sm3_ctx, tmp_digest);
67
68 if (hmac_size > len)
69 memcpy(digest, tmp_digest, len);
70
71 return TEE_SUCCESS;
72 }
73
op_sm3_hmac_free_ctx(struct crypto_mac_ctx * ctx)74 static void op_sm3_hmac_free_ctx(struct crypto_mac_ctx *ctx)
75 {
76 struct sm3_hmac_ctx *c = to_hmac_ctx(ctx);
77
78 memzero_explicit(&c->sm3_ctx, sizeof(c->sm3_ctx));
79 free(c);
80 }
81
op_sm3_hmac_copy_state(struct crypto_mac_ctx * dst_ctx,struct crypto_mac_ctx * src_ctx)82 static void op_sm3_hmac_copy_state(struct crypto_mac_ctx *dst_ctx,
83 struct crypto_mac_ctx *src_ctx)
84 {
85 struct sm3_hmac_ctx *src = to_hmac_ctx(src_ctx);
86 struct sm3_hmac_ctx *dst = to_hmac_ctx(dst_ctx);
87
88 dst->sm3_ctx = src->sm3_ctx;
89 }
90
91 static const struct crypto_mac_ops sm3_hmac_ops = {
92 .init = op_sm3_hmac_init,
93 .update = op_sm3_hmac_update,
94 .final = op_sm3_hmac_final,
95 .free_ctx = op_sm3_hmac_free_ctx,
96 .copy_state = op_sm3_hmac_copy_state,
97 };
98
crypto_hmac_sm3_alloc_ctx(struct crypto_mac_ctx ** ctx)99 TEE_Result crypto_hmac_sm3_alloc_ctx(struct crypto_mac_ctx **ctx)
100 {
101 struct sm3_hmac_ctx *c = NULL;
102
103 c = calloc(1, sizeof(*c));
104 if (!c)
105 return TEE_ERROR_OUT_OF_MEMORY;
106
107 c->mac_ctx.ops = &sm3_hmac_ops;
108
109 *ctx = &c->mac_ctx;
110
111 return TEE_SUCCESS;
112 }
113