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