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 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 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 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 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 uint8_t block_digest[TEE_MAX_HASH_SIZE] = { 0 }; 56 uint8_t *tmp_digest = NULL; 57 size_t hmac_size = 0; 58 59 if (len == 0) 60 return TEE_ERROR_BAD_PARAMETERS; 61 62 hmac_size = mbedtls_md_get_size(mbedtls_md_info_from_ctx(&c->md_ctx)); 63 if (hmac_size > len) { 64 if (hmac_size > sizeof(block_digest)) 65 return TEE_ERROR_BAD_STATE; 66 tmp_digest = block_digest; /* use a tempory buffer */ 67 } else { 68 tmp_digest = digest; 69 } 70 71 if (mbedtls_md_hmac_finish(&c->md_ctx, tmp_digest)) 72 return TEE_ERROR_BAD_STATE; 73 74 if (hmac_size > len) 75 memcpy(digest, tmp_digest, len); 76 77 return TEE_SUCCESS; 78 } 79 80 static void mbed_hmac_free_ctx(struct crypto_mac_ctx *ctx) 81 { 82 struct mbed_hmac_ctx *c = to_hmac_ctx(ctx); 83 84 mbedtls_md_free(&c->md_ctx); 85 free(c); 86 } 87 88 static void mbed_hmac_copy_state(struct crypto_mac_ctx *dst_ctx, 89 struct crypto_mac_ctx *src_ctx) 90 { 91 struct mbed_hmac_ctx *src = to_hmac_ctx(src_ctx); 92 struct mbed_hmac_ctx *dst = to_hmac_ctx(dst_ctx); 93 94 if (mbedtls_md_clone(&dst->md_ctx, &src->md_ctx)) 95 panic(); 96 } 97 98 static const struct crypto_mac_ops mbed_hmac_ops = { 99 .init = mbed_hmac_init, 100 .update = mbed_hmac_update, 101 .final = mbed_hmac_final, 102 .free_ctx = mbed_hmac_free_ctx, 103 .copy_state = mbed_hmac_copy_state, 104 }; 105 106 static TEE_Result mbed_hmac_alloc_ctx(struct crypto_mac_ctx **ctx_ret, 107 mbedtls_md_type_t md_type) 108 { 109 int mbed_res = 0; 110 struct mbed_hmac_ctx *c = NULL; 111 const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_type); 112 113 if (!md_info) 114 return TEE_ERROR_NOT_SUPPORTED; 115 116 c = calloc(1, sizeof(*c)); 117 if (!c) 118 return TEE_ERROR_OUT_OF_MEMORY; 119 120 c->mac_ctx.ops = &mbed_hmac_ops; 121 mbed_res = mbedtls_md_setup(&c->md_ctx, md_info, 1); 122 if (mbed_res) { 123 free(c); 124 if (mbed_res == MBEDTLS_ERR_MD_ALLOC_FAILED) 125 return TEE_ERROR_OUT_OF_MEMORY; 126 return TEE_ERROR_NOT_SUPPORTED; 127 } 128 129 *ctx_ret = &c->mac_ctx; 130 131 return TEE_SUCCESS; 132 } 133 134 #if defined(CFG_CRYPTO_MD5) 135 TEE_Result crypto_hmac_md5_alloc_ctx(struct crypto_mac_ctx **ctx) 136 { 137 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_MD5); 138 } 139 #endif 140 141 #if defined(CFG_CRYPTO_SHA1) 142 TEE_Result crypto_hmac_sha1_alloc_ctx(struct crypto_mac_ctx **ctx) 143 { 144 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA1); 145 } 146 #endif 147 148 #if defined(CFG_CRYPTO_SHA224) 149 TEE_Result crypto_hmac_sha224_alloc_ctx(struct crypto_mac_ctx **ctx) 150 { 151 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA224); 152 } 153 #endif 154 155 #if defined(CFG_CRYPTO_SHA256) 156 TEE_Result crypto_hmac_sha256_alloc_ctx(struct crypto_mac_ctx **ctx) 157 { 158 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA256); 159 } 160 #endif 161 162 #if defined(CFG_CRYPTO_SHA384) 163 TEE_Result crypto_hmac_sha384_alloc_ctx(struct crypto_mac_ctx **ctx) 164 { 165 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA384); 166 } 167 #endif 168 169 #if defined(CFG_CRYPTO_SHA512) 170 TEE_Result crypto_hmac_sha512_alloc_ctx(struct crypto_mac_ctx **ctx) 171 { 172 return mbed_hmac_alloc_ctx(ctx, MBEDTLS_MD_SHA512); 173 } 174 #endif 175