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// SPDX-License-Identifier: GPL-2.0+
#define LOG_CATEGORY UCLASS_AES
#include <dm.h>
#include <malloc.h>
#include <log.h>
#include <uboot_aes.h>
#include <linux/string.h>
int dm_aes_get_available_key_slots(struct udevice *dev)
{
const struct aes_ops *ops;
if (!dev)
return -ENODEV;
ops = aes_get_ops(dev);
if (!ops->available_key_slots)
return -ENOSYS;
return ops->available_key_slots(dev);
}
int dm_aes_select_key_slot(struct udevice *dev, u32 key_size, u8 slot)
{
const struct aes_ops *ops;
if (!dev)
return -ENODEV;
ops = aes_get_ops(dev);
if (!ops->select_key_slot)
return -ENOSYS;
return ops->select_key_slot(dev, key_size, slot);
}
int dm_aes_set_key_for_key_slot(struct udevice *dev, u32 key_size, u8 *key, u8 slot)
{
const struct aes_ops *ops;
if (!dev)
return -ENODEV;
ops = aes_get_ops(dev);
if (!ops->set_key_for_key_slot)
return -ENOSYS;
return ops->set_key_for_key_slot(dev, key_size, key, slot);
}
int dm_aes_ecb_encrypt(struct udevice *dev, u8 *src, u8 *dst, u32 num_aes_blocks)
{
const struct aes_ops *ops;
if (!dev)
return -ENODEV;
ops = aes_get_ops(dev);
if (!ops->aes_ecb_encrypt)
return -ENOSYS;
return ops->aes_ecb_encrypt(dev, src, dst, num_aes_blocks);
}
int dm_aes_ecb_decrypt(struct udevice *dev, u8 *src, u8 *dst, u32 num_aes_blocks)
{
const struct aes_ops *ops;
if (!dev)
return -ENODEV;
ops = aes_get_ops(dev);
if (!ops->aes_ecb_decrypt)
return -ENOSYS;
return ops->aes_ecb_decrypt(dev, src, dst, num_aes_blocks);
}
int dm_aes_cbc_encrypt(struct udevice *dev, u8 *iv, u8 *src, u8 *dst, u32 num_aes_blocks)
{
const struct aes_ops *ops;
if (!dev)
return -ENODEV;
ops = aes_get_ops(dev);
if (!ops->aes_cbc_encrypt)
return -ENOSYS;
return ops->aes_cbc_encrypt(dev, iv, src, dst, num_aes_blocks);
}
int dm_aes_cbc_decrypt(struct udevice *dev, u8 *iv, u8 *src, u8 *dst, u32 num_aes_blocks)
{
const struct aes_ops *ops;
if (!dev)
return -ENODEV;
ops = aes_get_ops(dev);
if (!ops->aes_cbc_decrypt)
return -ENOSYS;
return ops->aes_cbc_decrypt(dev, iv, src, dst, num_aes_blocks);
}
static void left_shift_vector(u8 *in, u8 *out, int size)
{
int carry = 0;
int i;
for (i = size - 1; i >= 0; i--) {
out[i] = (in[i] << 1) | carry;
carry = in[i] >> 7; /* get most significant bit */
}
}
int dm_aes_cmac(struct udevice *dev, u8 *src, u8 *dst, u32 num_aes_blocks)
{
const u8 AES_CMAC_CONST_RB = 0x87; /* from RFC 4493, Figure 2.2 */
const u32 TMP_BUFFER_LEN = 128;
u8 tmp_block[AES128_KEY_LENGTH] = { };
u8 k1[AES128_KEY_LENGTH];
u8 *tmp_buffer;
int ret;
log_debug("%s: 0x%p -> %p blocks %d\n", __func__, src, dst, num_aes_blocks);
if (!num_aes_blocks) {
log_debug("%s: called with 0 blocks!\n", __func__);
return -1;
}
/* Compute K1 constant needed by AES-CMAC calculation */
ret = dm_aes_cbc_encrypt(dev, (u8 *)AES_ZERO_BLOCK, (u8 *)AES_ZERO_BLOCK, tmp_block, 1);
if (ret)
return -1;
left_shift_vector(tmp_block, k1, AES_BLOCK_LENGTH);
if ((tmp_block[0] >> 7) != 0) /* get MSB of L */
k1[AES128_KEY_LENGTH - 1] ^= AES_CMAC_CONST_RB;
/* Set what will be the initial IV as zero */
memset(tmp_block, 0, AES_BLOCK_LENGTH);
/* Process all blocks except last by calling engine several times per dma buffer size */
if (num_aes_blocks > 1) {
tmp_buffer = malloc(AES_BLOCK_LENGTH * min(num_aes_blocks - 1, TMP_BUFFER_LEN));
if (!tmp_buffer)
return -1;
while (num_aes_blocks > 1) {
u32 blocks = min(num_aes_blocks - 1, TMP_BUFFER_LEN);
/* Encrypt the current remaining set of blocks that fits in tmp buffer */
ret = dm_aes_cbc_encrypt(dev, tmp_block, src, tmp_buffer, blocks);
if (ret) {
free(tmp_buffer);
return -1;
}
num_aes_blocks -= blocks;
src += blocks * AES_BLOCK_LENGTH;
/* Copy the last encrypted block to tmp_block as IV */
memcpy(tmp_block, tmp_buffer + ((blocks - 1) * AES_BLOCK_LENGTH),
AES_BLOCK_LENGTH);
}
free(tmp_buffer);
}
if (num_aes_blocks != 1) {
log_debug("%s: left with %d blocks! must be 1\n", __func__, num_aes_blocks);
return -1;
}
/* XOR last IV with K1 */
aes_apply_cbc_chain_data(tmp_block, k1, tmp_block);
/* Encrypt the last src block already with tmp_block as IV and output to dst */
return dm_aes_cbc_encrypt(dev, tmp_block, src, dst, 1);
}
UCLASS_DRIVER(aes) = {
.id = UCLASS_AES,
.name = "aes",
};
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