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