7ee8c4795d
This patch does the following: 1. The function names for encapsulation and decapsulation were inconsitent in freescale's implementation and cmd_blob file. This patch corrects the issues. 2. The function protopye is also modified to change the length parameter from u8 to u32 to allow encapsulation and decapsulation of larger images. 3. Modified the description of km paramter in the command usage for better readability. Signed-off-by: Gaurav Rana <gaurav.rana@freescale.com> Reviewed-by: Ruchika Gupta <ruchika.gupta@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com>
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/*
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*
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* Command for encapsulating/decapsulating blob of memory.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <malloc.h>
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#include <asm/byteorder.h>
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#include <linux/compiler.h>
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DECLARE_GLOBAL_DATA_PTR;
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/**
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* blob_decap() - Decapsulate the data as a blob
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* @key_mod: - Pointer to key modifier/key
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* @src: - Address of data to be decapsulated
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* @dst: - Address of data to be decapsulated
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* @len: - Size of data to be decapsulated
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*
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* Returns zero on success,and negative on error.
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*/
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__weak int blob_decap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
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{
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return 0;
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}
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/**
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* blob_encap() - Encapsulate the data as a blob
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* @key_mod: - Pointer to key modifier/key
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* @src: - Address of data to be encapsulated
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* @dst: - Address of data to be encapsulated
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* @len: - Size of data to be encapsulated
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*
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* Returns zero on success,and negative on error.
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*/
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__weak int blob_encap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
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{
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return 0;
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}
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/**
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* do_blob() - Handle the "blob" command-line command
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* @cmdtp: Command data struct pointer
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* @flag: Command flag
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* @argc: Command-line argument count
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* @argv: Array of command-line arguments
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*
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* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
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* on error.
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*/
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static int do_blob(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
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{
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uint32_t key_addr, src_addr, dst_addr, len;
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uint8_t *km_ptr, *src_ptr, *dst_ptr;
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int enc, ret = 0;
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if (argc != 6)
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return CMD_RET_USAGE;
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if (!strncmp(argv[1], "enc", 3))
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enc = 1;
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else if (!strncmp(argv[1], "dec", 3))
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enc = 0;
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else
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return CMD_RET_USAGE;
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src_addr = simple_strtoul(argv[2], NULL, 16);
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dst_addr = simple_strtoul(argv[3], NULL, 16);
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len = simple_strtoul(argv[4], NULL, 16);
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key_addr = simple_strtoul(argv[5], NULL, 16);
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km_ptr = (uint8_t *)key_addr;
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src_ptr = (uint8_t *)src_addr;
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dst_ptr = (uint8_t *)dst_addr;
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if (enc)
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ret = blob_encap(km_ptr, src_ptr, dst_ptr, len);
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else
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ret = blob_decap(km_ptr, src_ptr, dst_ptr, len);
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return ret;
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}
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/***************************************************/
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static char blob_help_text[] =
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"enc src dst len km - Encapsulate and create blob of data\n"
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" $len bytes long at address $src and\n"
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" store the result at address $dst.\n"
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" $km is the address where the key\n"
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" modifier is stored.\n"
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" The modifier is required for generation\n"
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" /use as key for cryptographic operation.\n"
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" Key modifier should be 16 byte long.\n"
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"blob dec src dst len km - Decapsulate the blob of data at address\n"
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" $src and store result of $len byte at\n"
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" addr $dst.\n"
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" $km is the address where the key\n"
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" modifier is stored.\n"
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" The modifier is required for generation\n"
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" /use as key for cryptographic operation.\n"
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" Key modifier should be 16 byte long.\n";
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U_BOOT_CMD(
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blob, 6, 1, do_blob,
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"Blob encapsulation/decryption",
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blob_help_text
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);
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