1 /* 2 * Copyright 2021 NXP 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 */ 7 8 #include <stddef.h> 9 #include <string.h> 10 11 #include "caam.h" 12 #include <common/debug.h> 13 #include <drivers/auth/crypto_mod.h> 14 15 #include "hash.h" 16 #include "rsa.h" 17 18 #define LIB_NAME "NXP crypto" 19 20 /* 21 * Initialize the library and export the descriptor 22 */ 23 static void init(void) 24 { 25 /* Initialize NXP crypto library`:*/ 26 NOTICE("Initializing & configuring SEC block.\n"); 27 28 if (config_sec_block() < 0) { 29 ERROR("Init & config failure for caam.\n"); 30 } 31 } 32 33 /* 34 * Verify a signature. 35 * 36 * For IMG_PLAT - data points to a PKCS#1.5 encoded HASH 37 * sig_alg will be RSA or ECC 38 * Parameters are passed using the DER encoding format following the ASN.1 39 * structures detailed above. 40 */ 41 static int verify_signature(void *data_ptr, unsigned int data_len, 42 void *sig_ptr, unsigned int sig_len, 43 void *sign_alg, unsigned int sig_alg_len, 44 void *pk_ptr, unsigned int pk_len) 45 { 46 int ret = CRYPTO_SUCCESS; 47 48 enum sig_alg alg = *(enum sig_alg *)sign_alg; 49 50 switch (alg) { 51 case RSA: 52 NOTICE("Verifying RSA\n"); 53 ret = rsa_verify_signature(data_ptr, data_len, sig_ptr, sig_len, 54 pk_ptr, pk_len); 55 break; 56 case ECC: 57 default: 58 ret = CRYPTO_ERR_SIGNATURE; 59 break; 60 } 61 62 if (ret != 0) { 63 ERROR("RSA verification Failed\n"); 64 } 65 return ret; 66 67 } 68 69 /* 70 * Match a hash 71 * 72 * Digest info is passed as a table of SHA-26 hashes and digest_info_len 73 * is number of entries in the table 74 * This implementation is very specific to the CSF header parser ROTPK 75 * comparison. 76 */ 77 static int verify_hash(void *data_ptr, unsigned int data_len, 78 void *digest_info_ptr, unsigned int digest_info_len) 79 { 80 void *ctx = NULL; 81 int i = 0, ret = 0; 82 enum hash_algo algo = SHA256; 83 uint8_t hash[SHA256_BYTES] __aligned(CACHE_WRITEBACK_GRANULE) = {0}; 84 uint32_t digest_size = SHA256_BYTES; 85 uint8_t *hash_tbl = digest_info_ptr; 86 87 NOTICE("Verifying hash\n"); 88 ret = hash_init(algo, &ctx); 89 if (ret != 0) { 90 return CRYPTO_ERR_HASH; 91 } 92 93 /* Update hash with that of SRK table */ 94 ret = hash_update(algo, ctx, data_ptr, data_len); 95 if (ret != 0) { 96 return CRYPTO_ERR_HASH; 97 } 98 99 /* Copy hash at destination buffer */ 100 ret = hash_final(algo, ctx, hash, digest_size); 101 if (ret != 0) { 102 return CRYPTO_ERR_HASH; 103 } 104 105 VERBOSE("%s Calculated hash\n", __func__); 106 for (i = 0; i < SHA256_BYTES/4; i++) { 107 VERBOSE("%x\n", *((uint32_t *)hash + i)); 108 } 109 110 for (i = 0; i < digest_info_len; i++) { 111 if (memcmp(hash, (hash_tbl + (i * digest_size)), 112 digest_size) == 0) { 113 return CRYPTO_SUCCESS; 114 } 115 } 116 117 return CRYPTO_ERR_HASH; 118 } 119 120 /* 121 * Register crypto library descriptor 122 */ 123 REGISTER_CRYPTO_LIB(LIB_NAME, init, verify_signature, verify_hash, NULL, NULL, NULL, NULL); 124