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 ); 112