diff options
Diffstat (limited to 'arch/arm/cpu/armv7/tegra20/crypto.c')
| -rw-r--r-- | arch/arm/cpu/armv7/tegra20/crypto.c | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/arch/arm/cpu/armv7/tegra20/crypto.c b/arch/arm/cpu/armv7/tegra20/crypto.c deleted file mode 100644 index 5f0b240e27..0000000000 --- a/arch/arm/cpu/armv7/tegra20/crypto.c +++ /dev/null @@ -1,230 +0,0 @@ -/* - * Copyright (c) 2011 The Chromium OS Authors. - * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com> - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - */ - -#include <common.h> -#include <asm/errno.h> -#include "crypto.h" -#include "aes.h" - -static u8 zero_key[16]; - -#define AES_CMAC_CONST_RB 0x87 /* from RFC 4493, Figure 2.2 */ - -enum security_op { - SECURITY_SIGN = 1 << 0, /* Sign the data */ - SECURITY_ENCRYPT = 1 << 1, /* Encrypt the data */ -}; - -static void debug_print_vector(char *name, u32 num_bytes, u8 *data) -{ - u32 i; - - debug("%s [%d] @0x%08x", name, num_bytes, (u32)data); - for (i = 0; i < num_bytes; i++) { - if (i % 16 == 0) - debug(" = "); - debug("%02x", data[i]); - if ((i+1) % 16 != 0) - debug(" "); - } - debug("\n"); -} - -/** - * Apply chain data to the destination using EOR - * - * Each array is of length AES_AES_KEY_LENGTH. - * - * \param cbc_chain_data Chain data - * \param src Source data - * \param dst Destination data, which is modified here - */ -static void apply_cbc_chain_data(u8 *cbc_chain_data, u8 *src, u8 *dst) -{ - int i; - - for (i = 0; i < 16; i++) - *dst++ = *src++ ^ *cbc_chain_data++; -} - -/** - * Encrypt some data with AES. - * - * \param key_schedule Expanded key to use - * \param src Source data to encrypt - * \param dst Destination buffer - * \param num_aes_blocks Number of AES blocks to encrypt - */ -static void encrypt_object(u8 *key_schedule, u8 *src, u8 *dst, - u32 num_aes_blocks) -{ - u8 tmp_data[AES_KEY_LENGTH]; - u8 *cbc_chain_data; - u32 i; - - cbc_chain_data = zero_key; /* Convenient array of 0's for IV */ - - for (i = 0; i < num_aes_blocks; i++) { - debug("encrypt_object: block %d of %d\n", i, num_aes_blocks); - debug_print_vector("AES Src", AES_KEY_LENGTH, src); - - /* Apply the chain data */ - apply_cbc_chain_data(cbc_chain_data, src, tmp_data); - debug_print_vector("AES Xor", AES_KEY_LENGTH, tmp_data); - - /* encrypt the AES block */ - aes_encrypt(tmp_data, key_schedule, dst); - debug_print_vector("AES Dst", AES_KEY_LENGTH, dst); - - /* Update pointers for next loop. */ - cbc_chain_data = dst; - src += AES_KEY_LENGTH; - dst += AES_KEY_LENGTH; - } -} - -/** - * Shift a vector left by one bit - * - * \param in Input vector - * \param out Output vector - * \param size Length of vector in bytes - */ -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 */ - } -} - -/** - * Sign a block of data, putting the result into dst. - * - * \param key Input AES key, length AES_KEY_LENGTH - * \param key_schedule Expanded key to use - * \param src Source data of length 'num_aes_blocks' blocks - * \param dst Destination buffer, length AES_KEY_LENGTH - * \param num_aes_blocks Number of AES blocks to encrypt - */ -static void sign_object(u8 *key, u8 *key_schedule, u8 *src, u8 *dst, - u32 num_aes_blocks) -{ - u8 tmp_data[AES_KEY_LENGTH]; - u8 left[AES_KEY_LENGTH]; - u8 k1[AES_KEY_LENGTH]; - u8 *cbc_chain_data; - unsigned i; - - cbc_chain_data = zero_key; /* Convenient array of 0's for IV */ - - /* compute K1 constant needed by AES-CMAC calculation */ - for (i = 0; i < AES_KEY_LENGTH; i++) - tmp_data[i] = 0; - - encrypt_object(key_schedule, tmp_data, left, 1); - debug_print_vector("AES(key, nonce)", AES_KEY_LENGTH, left); - - left_shift_vector(left, k1, sizeof(left)); - debug_print_vector("L", AES_KEY_LENGTH, left); - - if ((left[0] >> 7) != 0) /* get MSB of L */ - k1[AES_KEY_LENGTH-1] ^= AES_CMAC_CONST_RB; - debug_print_vector("K1", AES_KEY_LENGTH, k1); - - /* compute the AES-CMAC value */ - for (i = 0; i < num_aes_blocks; i++) { - /* Apply the chain data */ - apply_cbc_chain_data(cbc_chain_data, src, tmp_data); - - /* for the final block, XOR K1 into the IV */ - if (i == num_aes_blocks - 1) - apply_cbc_chain_data(tmp_data, k1, tmp_data); - - /* encrypt the AES block */ - aes_encrypt(tmp_data, key_schedule, dst); - - debug("sign_obj: block %d of %d\n", i, num_aes_blocks); - debug_print_vector("AES-CMAC Src", AES_KEY_LENGTH, src); - debug_print_vector("AES-CMAC Xor", AES_KEY_LENGTH, tmp_data); - debug_print_vector("AES-CMAC Dst", AES_KEY_LENGTH, dst); - - /* Update pointers for next loop. */ - cbc_chain_data = dst; - src += AES_KEY_LENGTH; - } - - debug_print_vector("AES-CMAC Hash", AES_KEY_LENGTH, dst); -} - -/** - * Encrypt and sign a block of data (depending on security mode). - * - * \param key Input AES key, length AES_KEY_LENGTH - * \param oper Security operations mask to perform (enum security_op) - * \param src Source data - * \param length Size of source data - * \param sig_dst Destination address for signature, AES_KEY_LENGTH bytes - */ -static int encrypt_and_sign(u8 *key, enum security_op oper, u8 *src, - u32 length, u8 *sig_dst) -{ - u32 num_aes_blocks; - u8 key_schedule[AES_EXPAND_KEY_LENGTH]; - - debug("encrypt_and_sign: length = %d\n", length); - debug_print_vector("AES key", AES_KEY_LENGTH, key); - - /* - * The only need for a key is for signing/checksum purposes, so - * if not encrypting, expand a key of 0s. - */ - aes_expand_key(oper & SECURITY_ENCRYPT ? key : zero_key, key_schedule); - - num_aes_blocks = (length + AES_KEY_LENGTH - 1) / AES_KEY_LENGTH; - - if (oper & SECURITY_ENCRYPT) { - /* Perform this in place, resulting in src being encrypted. */ - debug("encrypt_and_sign: begin encryption\n"); - encrypt_object(key_schedule, src, src, num_aes_blocks); - debug("encrypt_and_sign: end encryption\n"); - } - - if (oper & SECURITY_SIGN) { - /* encrypt the data, overwriting the result in signature. */ - debug("encrypt_and_sign: begin signing\n"); - sign_object(key, key_schedule, src, sig_dst, num_aes_blocks); - debug("encrypt_and_sign: end signing\n"); - } - - return 0; -} - -int sign_data_block(u8 *source, unsigned length, u8 *signature) -{ - return encrypt_and_sign(zero_key, SECURITY_SIGN, source, - length, signature); -} |
