cmd/blob.c

   1 /*
   2  *
   3  * Command for encapsulating/decapsulating blob of memory.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <environment.h>
  11 #include <malloc.h>
  12 #include <asm/byteorder.h>
  13 #include <linux/compiler.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 /**
  18  * blob_decap() - Decapsulate the data as a blob
  19  * @key_mod:    - Pointer to key modifier/key
  20  * @src:        - Address of data to be decapsulated
  21  * @dst:        - Address of data to be decapsulated
  22  * @len:        - Size of data to be decapsulated
  23  *
  24  * Returns zero on success,and negative on error.
  25  */
  26 __weak int blob_decap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
  27 {
  28         return 0;
  29 }
  30
  31 /**
  32  * blob_encap() - Encapsulate the data as a blob
  33  * @key_mod:    - Pointer to key modifier/key
  34  * @src:        - Address of data to be encapsulated
  35  * @dst:        - Address of data to be encapsulated
  36  * @len:        - Size of data to be encapsulated
  37  *
  38  * Returns zero on success,and negative on error.
  39  */
  40 __weak int blob_encap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
  41 {
  42         return 0;
  43 }
  44
  45 /**
  46  * do_blob() - Handle the "blob" command-line command
  47  * @cmdtp:      Command data struct pointer
  48  * @flag:       Command flag
  49  * @argc:       Command-line argument count
  50  * @argv:       Array of command-line arguments
  51  *
  52  * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
  53  * on error.
  54  */
  55 static int do_blob(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  56 {
  57         ulong key_addr, src_addr, dst_addr, len;
  58         uint8_t *km_ptr, *src_ptr, *dst_ptr;
  59         int enc, ret = 0;
  60
  61         if (argc != 6)
  62                 return CMD_RET_USAGE;
  63
  64         if (!strncmp(argv[1], "enc", 3))
  65                 enc = 1;
  66         else if (!strncmp(argv[1], "dec", 3))
  67                 enc = 0;
  68         else
  69                 return CMD_RET_USAGE;
  70
  71         src_addr = simple_strtoul(argv[2], NULL, 16);
  72         dst_addr = simple_strtoul(argv[3], NULL, 16);
  73         len = simple_strtoul(argv[4], NULL, 16);
  74         key_addr = simple_strtoul(argv[5], NULL, 16);
  75
  76         km_ptr = (uint8_t *)(uintptr_t)key_addr;
  77         src_ptr = (uint8_t *)(uintptr_t)src_addr;
  78         dst_ptr = (uint8_t *)(uintptr_t)dst_addr;
  79
  80         if (enc)
  81                 ret = blob_encap(km_ptr, src_ptr, dst_ptr, len);
  82         else
  83                 ret = blob_decap(km_ptr, src_ptr, dst_ptr, len);
  84
  85         return ret;
  86 }
  87
  88 /***************************************************/
  89 static char blob_help_text[] =
  90         "enc src dst len km - Encapsulate and create blob of data\n"
  91         "                          $len bytes long at address $src and\n"
  92         "                          store the result at address $dst.\n"
  93         "                          $km is the address where the key\n"
  94         "                          modifier is stored.\n"
  95         "                          The modifier is required for generation\n"
  96         "                          /use as key for cryptographic operation.\n"
  97         "                          Key modifier should be 16 byte long.\n"
  98         "blob dec src dst len km - Decapsulate the  blob of data at address\n"
  99         "                          $src and store result of $len byte at\n"
 100         "                          addr $dst.\n"
 101         "                          $km is the address where the key\n"
 102         "                          modifier is stored.\n"
 103         "                          The modifier is required for generation\n"
 104         "                          /use as key for cryptographic operation.\n"
 105         "                          Key modifier should be 16 byte long.\n";
 106
 107 U_BOOT_CMD(
 108         blob, 6, 1, do_blob,
 109         "Blob encapsulation/decryption",
 110         blob_help_text
 111 );