blob: d3f22a1afc908fd16c7ff41873c4aa133ccea092 [file] [log] [blame]
Ruchika Guptac5de15c2014-10-07 15:46:20 +05301/*
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
15DECLARE_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 */
55static int do_blob(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
56{
57 uint32_t 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 *)key_addr;
77 src_ptr = (uint8_t *)src_addr;
78 dst_ptr = (uint8_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/***************************************************/
89static 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"
gaurav rana7ee8c472015-02-25 09:37:09 +053093 " $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"
Ruchika Guptac5de15c2014-10-07 15:46:20 +053098 "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"
gaurav rana7ee8c472015-02-25 09:37:09 +0530101 " $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";
Ruchika Guptac5de15c2014-10-07 15:46:20 +0530106
107U_BOOT_CMD(
108 blob, 6, 1, do_blob,
109 "Blob encapsulation/decryption",
110 blob_help_text
111);