boot/image-sig.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2013, Google Inc.
   4  */
   5
   6 #include <common.h>
   7 #include <log.h>
   8 #include <malloc.h>
   9 #include <asm/global_data.h>
  10 DECLARE_GLOBAL_DATA_PTR;
  11 #include <image.h>
  12 #include <relocate.h>
  13 #include <u-boot/ecdsa.h>
  14 #include <u-boot/rsa.h>
  15 #include <u-boot/hash-checksum.h>
  16
  17 #define IMAGE_MAX_HASHED_NODES          100
  18
  19 struct checksum_algo checksum_algos[] = {
  20         {
  21                 .name = "sha1",
  22                 .checksum_len = SHA1_SUM_LEN,
  23                 .der_len = SHA1_DER_LEN,
  24                 .der_prefix = sha1_der_prefix,
  25                 .calculate = hash_calculate,
  26         },
  27         {
  28                 .name = "sha256",
  29                 .checksum_len = SHA256_SUM_LEN,
  30                 .der_len = SHA256_DER_LEN,
  31                 .der_prefix = sha256_der_prefix,
  32                 .calculate = hash_calculate,
  33         },
  34 #ifdef CONFIG_SHA384
  35         {
  36                 .name = "sha384",
  37                 .checksum_len = SHA384_SUM_LEN,
  38                 .der_len = SHA384_DER_LEN,
  39                 .der_prefix = sha384_der_prefix,
  40                 .calculate = hash_calculate,
  41         },
  42 #endif
  43 #ifdef CONFIG_SHA512
  44         {
  45                 .name = "sha512",
  46                 .checksum_len = SHA512_SUM_LEN,
  47                 .der_len = SHA512_DER_LEN,
  48                 .der_prefix = sha512_der_prefix,
  49                 .calculate = hash_calculate,
  50         },
  51 #endif
  52
  53 };
  54
  55 struct checksum_algo *image_get_checksum_algo(const char *full_name)
  56 {
  57         int i;
  58         const char *name;
  59
  60         if (IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC)) {
  61                 static bool done;
  62
  63                 if (!done) {
  64                         done = true;
  65                         for (i = 0; i < ARRAY_SIZE(checksum_algos); i++) {
  66                                 struct checksum_algo *algo = &checksum_algos[i];
  67
  68                                 MANUAL_RELOC(algo->name);
  69                                 MANUAL_RELOC(algo->calculate);
  70                         }
  71                 }
  72         }
  73
  74         for (i = 0; i < ARRAY_SIZE(checksum_algos); i++) {
  75                 name = checksum_algos[i].name;
  76                 /* Make sure names match and next char is a comma */
  77                 if (!strncmp(name, full_name, strlen(name)) &&
  78                     full_name[strlen(name)] == ',')
  79                         return &checksum_algos[i];
  80         }
  81
  82         return NULL;
  83 }
  84
  85 struct crypto_algo *image_get_crypto_algo(const char *full_name)
  86 {
  87         struct crypto_algo *crypto, *end;
  88         const char *name;
  89
  90         if (IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC)) {
  91                 static bool done;
  92
  93                 if (!done) {
  94                         done = true;
  95                         crypto = ll_entry_start(struct crypto_algo, cryptos);
  96                         end = ll_entry_end(struct crypto_algo, cryptos);
  97                         for (; crypto < end; crypto++) {
  98                                 MANUAL_RELOC(crypto->name);
  99                                 MANUAL_RELOC(crypto->verify);
 100                         }
 101                 }
 102         }
 103
 104         /* Move name to after the comma */
 105         name = strchr(full_name, ',');
 106         if (!name)
 107                 return NULL;
 108         name += 1;
 109
 110         crypto = ll_entry_start(struct crypto_algo, cryptos);
 111         end = ll_entry_end(struct crypto_algo, cryptos);
 112         for (; crypto < end; crypto++) {
 113                 if (!strcmp(crypto->name, name))
 114                         return crypto;
 115         }
 116
 117         /* Not found */
 118         return NULL;
 119 }
 120
 121 struct padding_algo *image_get_padding_algo(const char *name)
 122 {
 123         struct padding_algo *padding, *end;
 124
 125         if (!name)
 126                 return NULL;
 127
 128         padding = ll_entry_start(struct padding_algo, paddings);
 129         end = ll_entry_end(struct padding_algo, paddings);
 130         for (; padding < end; padding++) {
 131                 if (!strcmp(padding->name, name))
 132                         return padding;
 133         }
 134
 135         return NULL;
 136 }