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u-boot-brain/arch/arm/mach-imx/cmd_dek.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2008-2015 Freescale Semiconductor, Inc.
*
* Command for encapsulating DEK blob
*/
#include <common.h>
#include <command.h>
#include <log.h>
#include <malloc.h>
#include <asm/byteorder.h>
#include <linux/compiler.h>
#include <fsl_sec.h>
#include <asm/arch/clock.h>
#include <mapmem.h>
#include <tee.h>
#ifdef CONFIG_IMX_SECO_DEK_ENCAP
#include <asm/arch/sci/sci.h>
#include <asm/arch/image.h>
#endif
#include <cpu_func.h>
/**
* blob_dek() - Encapsulate the DEK as a blob using CAM's Key
* @src: - Address of data to be encapsulated
* @dst: - Desination address of encapsulated data
* @len: - Size of data to be encapsulated
*
* Returns zero on success,and negative on error.
*/
#ifdef CONFIG_IMX_CAAM_DEK_ENCAP
static int blob_encap_dek(u32 src_addr, u32 dst_addr, u32 len)
{
u8 *src_ptr, *dst_ptr;
src_ptr = map_sysmem(src_addr, len / 8);
dst_ptr = map_sysmem(dst_addr, BLOB_SIZE(len / 8));
hab_caam_clock_enable(1);
u32 out_jr_size = sec_in32(CONFIG_SYS_FSL_JR0_ADDR +
FSL_CAAM_ORSR_JRa_OFFSET);
if (out_jr_size != FSL_CAAM_MAX_JR_SIZE)
sec_init();
if (!((len == 128) | (len == 192) | (len == 256))) {
debug("Invalid DEK size. Valid sizes are 128, 192 and 256b\n");
return -1;
}
len /= 8;
return blob_dek(src_ptr, dst_ptr, len);
}
#endif /* CONFIG_IMX_CAAM_DEK_ENCAP */
#ifdef CONFIG_IMX_OPTEE_DEK_ENCAP
#define PTA_DEK_BLOB_PTA_UUID {0xef477737, 0x0db1, 0x4a9d, \
{0x84, 0x37, 0xf2, 0xf5, 0x35, 0xc0, 0xbd, 0x92} }
#define OPTEE_BLOB_HDR_SIZE 8
static int blob_encap_dek(u32 src_addr, u32 dst_addr, u32 len)
{
struct udevice *dev = NULL;
struct tee_shm *shm_input, *shm_output;
struct tee_open_session_arg arg = {0};
struct tee_invoke_arg arg_func = {0};
const struct tee_optee_ta_uuid uuid = PTA_DEK_BLOB_PTA_UUID;
struct tee_param param[4] = {0};
int ret;
/* Get tee device */
dev = tee_find_device(NULL, NULL, NULL, NULL);
if (!dev) {
printf("Cannot get OP-TEE device\n");
return -1;
}
/* Set TA UUID */
tee_optee_ta_uuid_to_octets(arg.uuid, &uuid);
/* Open TA session */
ret = tee_open_session(dev, &arg, 0, NULL);
if (ret < 0) {
printf("Cannot open session with PTA Blob 0x%X\n", ret);
return -1;
}
/* Allocate shared input and output buffers for TA */
ret = tee_shm_register(dev, (void *)(ulong)src_addr, len / 8, 0x0, &shm_input);
if (ret < 0) {
printf("Cannot register input shared memory 0x%X\n", ret);
goto error;
}
ret = tee_shm_register(dev, (void *)(ulong)dst_addr,
BLOB_SIZE(len / 8) + OPTEE_BLOB_HDR_SIZE,
0x0, &shm_output);
if (ret < 0) {
printf("Cannot register output shared memory 0x%X\n", ret);
goto error;
}
param[0].u.memref.shm = shm_input;
param[0].u.memref.size = shm_input->size;
param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
param[1].u.memref.shm = shm_output;
param[1].u.memref.size = shm_output->size;
param[1].attr = TEE_PARAM_ATTR_TYPE_MEMREF_OUTPUT;
param[2].attr = TEE_PARAM_ATTR_TYPE_NONE;
param[3].attr = TEE_PARAM_ATTR_TYPE_NONE;
arg_func.func = 0;
arg_func.session = arg.session;
/* Generate DEK blob */
arg_func.session = arg.session;
ret = tee_invoke_func(dev, &arg_func, 4, param);
if (ret < 0)
printf("Cannot generate Blob with PTA DEK Blob 0x%X\n", ret);
error:
/* Free shared memory */
tee_shm_free(shm_input);
tee_shm_free(shm_output);
/* Close session */
ret = tee_close_session(dev, arg.session);
if (ret < 0)
printf("Cannot close session with PTA DEK Blob 0x%X\n", ret);
return ret;
}
#endif /* CONFIG_IMX_OPTEE_DEK_ENCAP */
#ifdef CONFIG_IMX_SECO_DEK_ENCAP
#define DEK_BLOB_KEY_ID 0x0
#define AHAB_PRIVATE_KEY 0x81
#define AHAB_VERSION 0x00
#define AHAB_MODE_CBC 0x67
#define AHAB_ALG_AES 0x55
#define AHAB_128_AES_KEY 0x10
#define AHAB_192_AES_KEY 0x18
#define AHAB_256_AES_KEY 0x20
#define AHAB_FLAG_KEK 0x80
#define AHAB_DEK_BLOB 0x01
#define DEK_BLOB_HDR_SIZE 8
#define SECO_PT 2U
static int blob_encap_dek(u32 src_addr, u32 dst_addr, u32 len)
{
sc_err_t err;
sc_rm_mr_t mr_input, mr_output;
struct generate_key_blob_hdr hdr;
u8 in_size, out_size;
u8 *src_ptr, *dst_ptr;
int ret = 0;
int i;
/* Set sizes */
in_size = sizeof(struct generate_key_blob_hdr) + len / 8;
out_size = BLOB_SIZE(len / 8) + DEK_BLOB_HDR_SIZE;
/* Get src and dst virtual addresses */
src_ptr = map_sysmem(src_addr, in_size);
dst_ptr = map_sysmem(dst_addr, out_size);
/* Check addr input */
if (!(src_ptr && dst_ptr)) {
debug("src_addr or dst_addr invalid\n");
return -1;
}
/* Build key header */
hdr.version = AHAB_VERSION;
hdr.length_lsb = sizeof(struct generate_key_blob_hdr) + len / 8;
hdr.length_msb = 0x00;
hdr.tag = AHAB_PRIVATE_KEY;
hdr.flags = AHAB_DEK_BLOB;
hdr.algorithm = AHAB_ALG_AES;
hdr.mode = AHAB_MODE_CBC;
switch (len) {
case 128:
hdr.size = AHAB_128_AES_KEY;
break;
case 192:
hdr.size = AHAB_192_AES_KEY;
break;
case 256:
hdr.size = AHAB_256_AES_KEY;
break;
default:
/* Not supported */
debug("Invalid DEK size. Valid sizes are 128, 192 and 256b\n");
return -1;
}
/* Build input message */
memmove((void *)(src_ptr + sizeof(struct generate_key_blob_hdr)),
(void *)src_ptr, len / 8);
memcpy((void *)src_ptr, (void *)&hdr,
sizeof(struct generate_key_blob_hdr));
/* Flush the cache before triggering the CAAM DMA */
flush_dcache_range(src_addr, src_addr + in_size);
/* Find input memory region */
err = sc_rm_find_memreg((-1), &mr_input, src_addr & ~(CONFIG_SYS_CACHELINE_SIZE - 1),
ALIGN(src_addr + in_size, CONFIG_SYS_CACHELINE_SIZE));
if (err) {
printf("Error: find memory region 0x%X\n", src_addr);
return -ENOMEM;
}
/* Find output memory region */
err = sc_rm_find_memreg((-1), &mr_output, dst_addr & ~(CONFIG_SYS_CACHELINE_SIZE - 1),
ALIGN(dst_addr + out_size, CONFIG_SYS_CACHELINE_SIZE));
if (err) {
printf("Error: find memory region 0x%X\n", dst_addr);
return -ENOMEM;
}
/* Set memory region permissions for SECO */
err = sc_rm_set_memreg_permissions(-1, mr_input, SECO_PT,
SC_RM_PERM_FULL);
if (err) {
printf("Set permission failed for input memory region\n");
ret = -EPERM;
goto error;
}
err = sc_rm_set_memreg_permissions(-1, mr_output, SECO_PT,
SC_RM_PERM_FULL);
if (err) {
printf("Set permission failed for output memory region\n");
ret = -EPERM;
goto error;
}
/* Flush output data before SECO operation */
flush_dcache_range((ulong)dst_ptr, (ulong)(dst_ptr +
roundup(out_size, ARCH_DMA_MINALIGN)));
/* Generate DEK blob */
err = sc_seco_gen_key_blob((-1), 0x0, src_addr, dst_addr, out_size);
if (err) {
ret = -EPERM;
goto error;
}
/* Invalidate output buffer */
invalidate_dcache_range((ulong)dst_ptr, (ulong)(dst_ptr +
roundup(out_size, ARCH_DMA_MINALIGN)));
printf("DEK Blob\n");
for (i = 0; i < DEK_BLOB_HDR_SIZE + BLOB_SIZE(len / 8); i++)
printf("%02X", dst_ptr[i]);
printf("\n");
error:
/* Remove memory region permission to SECO */
err = sc_rm_set_memreg_permissions(-1, mr_input, SECO_PT,
SC_RM_PERM_NONE);
if (err) {
printf("Error: remove permission failed for input\n");
ret = -EPERM;
}
err = sc_rm_set_memreg_permissions(-1, mr_output, SECO_PT,
SC_RM_PERM_NONE);
if (err) {
printf("Error: remove permission failed for output\n");
ret = -EPERM;
}
return ret;
}
#endif /* CONFIG_IMX_SECO_DEK_ENCAP */
/**
* do_dek_blob() - Handle the "dek_blob" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int do_dek_blob(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
uint32_t src_addr, dst_addr, len;
if (argc != 4)
return CMD_RET_USAGE;
src_addr = simple_strtoul(argv[1], NULL, 16);
dst_addr = simple_strtoul(argv[2], NULL, 16);
len = simple_strtoul(argv[3], NULL, 10);
return blob_encap_dek(src_addr, dst_addr, len);
}
/***************************************************/
static char dek_blob_help_text[] =
"src dst len - Encapsulate and create blob of data\n"
" $len bits long at address $src and\n"
" store the result at address $dst.\n";
U_BOOT_CMD(
dek_blob, 4, 1, do_dek_blob,
"Data Encryption Key blob encapsulation",
dek_blob_help_text
);
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