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 <kernel/panic.h>
12 #include <mbedtls/md.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <tee_api_types.h>
16 #include <utee_defines.h>
17 #include <util.h>
18
19 struct mbed_hmac_ctx {
20 struct crypto_mac_ctx mac_ctx;
21 mbedtls_md_context_t md_ctx;
22 };
23
24 static const struct crypto_mac_ops mbed_hmac_ops;
25
to_hmac_ctx(struct crypto_mac_ctx * ctx)26 static struct mbed_hmac_ctx *to_hmac_ctx(struct crypto_mac_ctx *ctx)
27 {
28 assert(ctx && ctx->ops == &mbed_hmac_ops);
29
30 return container_of(ctx, struct mbed_hmac_ctx, mac_ctx);
31 }
32
mbed_hmac_init(struct crypto_mac_ctx * ctx,const uint8_t * key,size_t len)33 static TEE_Result mbed_hmac_init(struct crypto_mac_ctx *ctx,
34 const uint8_t *key, size_t len)
35 {
36 if (mbedtls_md_hmac_starts(&to_hmac_ctx(ctx)->md_ctx, key, len))
37 return TEE_ERROR_BAD_STATE;
38
39 return TEE_SUCCESS;
40 }
41
mbed_hmac_update(struct crypto_mac_ctx * ctx,const uint8_t * data,size_t len)42 static TEE_Result mbed_hmac_update(struct crypto_mac_ctx *ctx,
43 const uint8_t *data, size_t len)
44 {
45 if (mbedtls_md_hmac_update(&to_hmac_ctx(ctx)->md_ctx, data, len))
46 return TEE_ERROR_BAD_STATE;
47
48 return TEE_SUCCESS;
49 }
50
mbed_hmac_final(struct crypto_mac_ctx * ctx,uint8_t * digest,size_t len)51 static TEE_Result mbed_hmac_final(struct crypto_mac_ctx *ctx, uint8_t *digest,
52 size_t len)
53 {
54 struct mbed_hmac_ctx *c = to_hmac_ctx(ctx);
55 size_t hmac_size = mbedtls_md_get_size(c->md_ctx.md_info);
56 uint8_t block_digest[TEE_MAX_HASH_SIZE] = { 0 };
57 uint8_t *tmp_digest = NULL;
58
59 if (len == 0)
60 return TEE_ERROR_BAD_PARAMETERS;
61
62 if (hmac_size > len) {
63 if (hmac_size > sizeof(block_digest))
64 return TEE_ERROR_BAD_STATE;
65 tmp_digest = block_digest; /* use a tempory buffer */
66 } else {
67 tmp_digest = digest;
68 }
69
70 if (mbedtls_md_hmac_finish(&c->md_ctx, tmp_digest))
71 return TEE_ERROR_BAD_STATE;
72
73 if (hmac_size > len)
74 memcpy(digest, tmp_digest, len);
75
76 return TEE_SUCCESS;
77 }
78
mbed_hmac_free_ctx(struct crypto_mac_ctx * ctx)79 static void mbed_hmac_free_ctx(struct crypto_mac_ctx *ctx)
80 {
81 struct mbed_hmac_ctx *c = to_hmac_ctx(ctx);
82
83 mbedtls_md_free(&c->md_ctx);
84 free(c);
85 }
86
mbed_hmac_copy_state(struct crypto_mac_ctx * dst_ctx,struct crypto_mac_ctx * src_ctx)87 static void mbed_hmac_copy_state(struct crypto_mac_ctx *dst_ctx,
88 struct crypto_mac_ctx *src_ctx)
89 {
90 struct mbed_hmac_ctx *src = to_hmac_ctx(src_ctx);
91 struct mbed_hmac_ctx *dst = to_hmac_ctx(dst_ctx);
92
93 if (mbedtls_md_clone(&dst->md_ctx, &src->md_ctx))
94 panic();
95 }
96
97 static const struct crypto_mac_ops mbed_hmac_ops = {
98 .init = mbed_hmac_init,
99 .update = mbed_hmac_update,
100 .final = mbed_hmac_final,
101 .free_ctx = mbed_hmac_free_ctx,
102 .copy_state = mbed_hmac_copy_state,
103 };
104
mbed_hmac_alloc_ctx(struct crypto_mac_ctx ** ctx_ret,mbedtls_md_type_t md_type)105 static TEE_Result mbed_hmac_alloc_ctx(struct crypto_mac_ctx **ctx_ret,
106 mbedtls_md_type_t md_type)
107 {
108 int mbed_res = 0;
109 struct mbed_hmac_ctx *c = NULL;
110 const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_type);
111
112 if (!md_info)
113 return TEE_ERROR_NOT_SUPPORTED;
114
115 c = calloc(1, sizeof(*c));
116 if (!c)
117 return TEE_ERROR_OUT_OF_MEMORY;
118
119 c->mac_ctx.ops = &mbed_hmac_ops;
120 mbed_res = mbedtls_md_setup(&c->md_ctx, md_info, 1);
121 if (mbed_res) {
122 free(c);
123 if (mbed_res == MBEDTLS_ERR_MD_ALLOC_FAILED)
124 return TEE_ERROR_OUT_OF_MEMORY;
125 return TEE_ERROR_NOT_SUPPORTED;
126 }
127
128 *ctx_ret = &c->mac_ctx;
129
130 return TEE_SUCCESS;
131 }
132
133 #if defined(CFG_CRYPTO_MD5)
crypto_hmac_md5_alloc_ctx(struct crypto_mac_ctx ** ctx)134 TEE_Result crypto_hmac_md5_alloc_ctx(struct crypto_mac_ctx **ctx)
135 {
136 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_MD5);
137 }
138 #endif
139
140 #if defined(CFG_CRYPTO_SHA1)
crypto_hmac_sha1_alloc_ctx(struct crypto_mac_ctx ** ctx)141 TEE_Result crypto_hmac_sha1_alloc_ctx(struct crypto_mac_ctx **ctx)
142 {
143 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA1);
144 }
145 #endif
146
147 #if defined(CFG_CRYPTO_SHA224)
crypto_hmac_sha224_alloc_ctx(struct crypto_mac_ctx ** ctx)148 TEE_Result crypto_hmac_sha224_alloc_ctx(struct crypto_mac_ctx **ctx)
149 {
150 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA224);
151 }
152 #endif
153
154 #if defined(CFG_CRYPTO_SHA256)
crypto_hmac_sha256_alloc_ctx(struct crypto_mac_ctx ** ctx)155 TEE_Result crypto_hmac_sha256_alloc_ctx(struct crypto_mac_ctx **ctx)
156 {
157 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA256);
158 }
159 #endif
160
161 #if defined(CFG_CRYPTO_SHA384)
crypto_hmac_sha384_alloc_ctx(struct crypto_mac_ctx ** ctx)162 TEE_Result crypto_hmac_sha384_alloc_ctx(struct crypto_mac_ctx **ctx)
163 {
164 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA384);
165 }
166 #endif
167
168 #if defined(CFG_CRYPTO_SHA512)
crypto_hmac_sha512_alloc_ctx(struct crypto_mac_ctx ** ctx)169 TEE_Result crypto_hmac_sha512_alloc_ctx(struct crypto_mac_ctx **ctx)
170 {
171 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA512);
172 }
173 #endif
174