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@@ -1,533 +0,0 @@
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-/*
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- * AES-based functions
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- *
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- * - AES Key Wrap Algorithm (128-bit KEK) (RFC3394)
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- * - One-Key CBC MAC (OMAC1, i.e., CMAC) hash with AES-128
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- * - AES-128 CTR mode encryption
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- * - AES-128 EAX mode encryption/decryption
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- * - AES-128 CBC
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- *
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- * Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * Alternatively, this software may be distributed under the terms of BSD
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- * license.
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- *
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- * See README and COPYING for more details.
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- */
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-
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-#include "includes.h"
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-
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-#include "common.h"
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-#include "aes_wrap.h"
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-#include "crypto.h"
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-
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-#ifndef CONFIG_NO_AES_WRAP
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-
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-/**
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- * aes_wrap - Wrap keys with AES Key Wrap Algorithm (128-bit KEK) (RFC3394)
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- * @kek: 16-octet Key encryption key (KEK)
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- * @n: Length of the plaintext key in 64-bit units; e.g., 2 = 128-bit = 16
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- * bytes
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- * @plain: Plaintext key to be wrapped, n * 64 bits
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- * @cipher: Wrapped key, (n + 1) * 64 bits
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- * Returns: 0 on success, -1 on failure
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- */
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-int aes_wrap(const u8 *kek, int n, const u8 *plain, u8 *cipher)
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-{
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- u8 *a, *r, b[16];
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- int i, j;
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- void *ctx;
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-
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- a = cipher;
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- r = cipher + 8;
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-
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- /* 1) Initialize variables. */
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- os_memset(a, 0xa6, 8);
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- os_memcpy(r, plain, 8 * n);
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-
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- ctx = aes_encrypt_init(kek, 16);
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- if (ctx == NULL)
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- return -1;
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-
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- /* 2) Calculate intermediate values.
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- * For j = 0 to 5
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- * For i=1 to n
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- * B = AES(K, A | R[i])
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- * A = MSB(64, B) ^ t where t = (n*j)+i
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- * R[i] = LSB(64, B)
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- */
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- for (j = 0; j <= 5; j++) {
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- r = cipher + 8;
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- for (i = 1; i <= n; i++) {
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- os_memcpy(b, a, 8);
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- os_memcpy(b + 8, r, 8);
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- aes_encrypt(ctx, b, b);
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- os_memcpy(a, b, 8);
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- a[7] ^= n * j + i;
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- os_memcpy(r, b + 8, 8);
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- r += 8;
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- }
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- }
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- aes_encrypt_deinit(ctx);
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-
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- /* 3) Output the results.
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- *
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- * These are already in @cipher due to the location of temporary
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- * variables.
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- */
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-
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- return 0;
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-}
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-
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-#endif /* CONFIG_NO_AES_WRAP */
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-
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-
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-#ifndef CONFIG_NO_AES_UNWRAP
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-
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-/**
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- * aes_unwrap - Unwrap key with AES Key Wrap Algorithm (128-bit KEK) (RFC3394)
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- * @kek: Key encryption key (KEK)
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- * @n: Length of the plaintext key in 64-bit units; e.g., 2 = 128-bit = 16
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- * bytes
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- * @cipher: Wrapped key to be unwrapped, (n + 1) * 64 bits
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- * @plain: Plaintext key, n * 64 bits
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- * Returns: 0 on success, -1 on failure (e.g., integrity verification failed)
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- */
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-int aes_unwrap(const u8 *kek, int n, const u8 *cipher, u8 *plain)
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-{
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- u8 a[8], *r, b[16];
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- int i, j;
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- void *ctx;
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-
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- /* 1) Initialize variables. */
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- os_memcpy(a, cipher, 8);
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- r = plain;
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- os_memcpy(r, cipher + 8, 8 * n);
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-
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- ctx = aes_decrypt_init(kek, 16);
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- if (ctx == NULL)
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- return -1;
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-
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- /* 2) Compute intermediate values.
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- * For j = 5 to 0
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- * For i = n to 1
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- * B = AES-1(K, (A ^ t) | R[i]) where t = n*j+i
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- * A = MSB(64, B)
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- * R[i] = LSB(64, B)
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- */
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- for (j = 5; j >= 0; j--) {
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- r = plain + (n - 1) * 8;
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- for (i = n; i >= 1; i--) {
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- os_memcpy(b, a, 8);
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- b[7] ^= n * j + i;
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-
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- os_memcpy(b + 8, r, 8);
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- aes_decrypt(ctx, b, b);
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- os_memcpy(a, b, 8);
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- os_memcpy(r, b + 8, 8);
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- r -= 8;
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- }
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- }
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- aes_decrypt_deinit(ctx);
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-
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- /* 3) Output results.
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- *
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- * These are already in @plain due to the location of temporary
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- * variables. Just verify that the IV matches with the expected value.
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- */
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- for (i = 0; i < 8; i++) {
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- if (a[i] != 0xa6)
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- return -1;
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- }
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-
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- return 0;
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-}
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-
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-#endif /* CONFIG_NO_AES_UNWRAP */
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-
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-
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-#define BLOCK_SIZE 16
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-
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-#ifndef CONFIG_NO_AES_OMAC1
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-
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-static void gf_mulx(u8 *pad)
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-{
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- int i, carry;
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-
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- carry = pad[0] & 0x80;
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- for (i = 0; i < BLOCK_SIZE - 1; i++)
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- pad[i] = (pad[i] << 1) | (pad[i + 1] >> 7);
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- pad[BLOCK_SIZE - 1] <<= 1;
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- if (carry)
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- pad[BLOCK_SIZE - 1] ^= 0x87;
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-}
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-
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-
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-/**
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- * omac1_aes_128_vector - One-Key CBC MAC (OMAC1) hash with AES-128
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- * @key: 128-bit key for the hash operation
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- * @num_elem: Number of elements in the data vector
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- * @addr: Pointers to the data areas
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- * @len: Lengths of the data blocks
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- * @mac: Buffer for MAC (128 bits, i.e., 16 bytes)
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- * Returns: 0 on success, -1 on failure
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- *
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- * This is a mode for using block cipher (AES in this case) for authentication.
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- * OMAC1 was standardized with the name CMAC by NIST in a Special Publication
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- * (SP) 800-38B.
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- */
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-int omac1_aes_128_vector(const u8 *key, size_t num_elem,
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- const u8 *addr[], const size_t *len, u8 *mac)
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-{
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- void *ctx;
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- u8 cbc[BLOCK_SIZE], pad[BLOCK_SIZE];
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- const u8 *pos, *end;
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- size_t i, e, left, total_len;
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-
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- ctx = aes_encrypt_init(key, 16);
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- if (ctx == NULL)
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- return -1;
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- os_memset(cbc, 0, BLOCK_SIZE);
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-
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- total_len = 0;
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- for (e = 0; e < num_elem; e++)
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- total_len += len[e];
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- left = total_len;
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-
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- e = 0;
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- pos = addr[0];
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- end = pos + len[0];
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-
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- while (left >= BLOCK_SIZE) {
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- for (i = 0; i < BLOCK_SIZE; i++) {
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- cbc[i] ^= *pos++;
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- if (pos >= end) {
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- e++;
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- pos = addr[e];
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- end = pos + len[e];
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- }
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- }
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- if (left > BLOCK_SIZE)
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- aes_encrypt(ctx, cbc, cbc);
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- left -= BLOCK_SIZE;
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- }
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-
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- os_memset(pad, 0, BLOCK_SIZE);
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- aes_encrypt(ctx, pad, pad);
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- gf_mulx(pad);
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-
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- if (left || total_len == 0) {
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- for (i = 0; i < left; i++) {
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- cbc[i] ^= *pos++;
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- if (pos >= end) {
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- e++;
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- pos = addr[e];
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- end = pos + len[e];
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- }
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- }
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- cbc[left] ^= 0x80;
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- gf_mulx(pad);
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- }
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-
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- for (i = 0; i < BLOCK_SIZE; i++)
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- pad[i] ^= cbc[i];
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- aes_encrypt(ctx, pad, mac);
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- aes_encrypt_deinit(ctx);
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- return 0;
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-}
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-
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-
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-/**
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- * omac1_aes_128 - One-Key CBC MAC (OMAC1) hash with AES-128 (aka AES-CMAC)
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- * @key: 128-bit key for the hash operation
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- * @data: Data buffer for which a MAC is determined
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- * @data_len: Length of data buffer in bytes
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- * @mac: Buffer for MAC (128 bits, i.e., 16 bytes)
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- * Returns: 0 on success, -1 on failure
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- *
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- * This is a mode for using block cipher (AES in this case) for authentication.
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- * OMAC1 was standardized with the name CMAC by NIST in a Special Publication
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- * (SP) 800-38B.
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- */
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-int omac1_aes_128(const u8 *key, const u8 *data, size_t data_len, u8 *mac)
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-{
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- return omac1_aes_128_vector(key, 1, &data, &data_len, mac);
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-}
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-
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-#endif /* CONFIG_NO_AES_OMAC1 */
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-
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-
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-#ifndef CONFIG_NO_AES_ENCRYPT_BLOCK
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-/**
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- * aes_128_encrypt_block - Perform one AES 128-bit block operation
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- * @key: Key for AES
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- * @in: Input data (16 bytes)
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- * @out: Output of the AES block operation (16 bytes)
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- * Returns: 0 on success, -1 on failure
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- */
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-int aes_128_encrypt_block(const u8 *key, const u8 *in, u8 *out)
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-{
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- void *ctx;
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- ctx = aes_encrypt_init(key, 16);
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- if (ctx == NULL)
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- return -1;
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- aes_encrypt(ctx, in, out);
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- aes_encrypt_deinit(ctx);
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- return 0;
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-}
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-#endif /* CONFIG_NO_AES_ENCRYPT_BLOCK */
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-
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-
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-#ifndef CONFIG_NO_AES_CTR
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-
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-/**
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- * aes_128_ctr_encrypt - AES-128 CTR mode encryption
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- * @key: Key for encryption (16 bytes)
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- * @nonce: Nonce for counter mode (16 bytes)
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- * @data: Data to encrypt in-place
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- * @data_len: Length of data in bytes
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- * Returns: 0 on success, -1 on failure
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- */
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-int aes_128_ctr_encrypt(const u8 *key, const u8 *nonce,
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- u8 *data, size_t data_len)
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-{
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- void *ctx;
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- size_t j, len, left = data_len;
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- int i;
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- u8 *pos = data;
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- u8 counter[BLOCK_SIZE], buf[BLOCK_SIZE];
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-
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- ctx = aes_encrypt_init(key, 16);
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- if (ctx == NULL)
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- return -1;
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- os_memcpy(counter, nonce, BLOCK_SIZE);
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-
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- while (left > 0) {
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- aes_encrypt(ctx, counter, buf);
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-
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- len = (left < BLOCK_SIZE) ? left : BLOCK_SIZE;
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- for (j = 0; j < len; j++)
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- pos[j] ^= buf[j];
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- pos += len;
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- left -= len;
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-
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- for (i = BLOCK_SIZE - 1; i >= 0; i--) {
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- counter[i]++;
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- if (counter[i])
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- break;
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- }
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- }
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- aes_encrypt_deinit(ctx);
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- return 0;
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-}
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-
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-#endif /* CONFIG_NO_AES_CTR */
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-
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-
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-#ifndef CONFIG_NO_AES_EAX
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-
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-/**
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- * aes_128_eax_encrypt - AES-128 EAX mode encryption
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- * @key: Key for encryption (16 bytes)
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- * @nonce: Nonce for counter mode
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- * @nonce_len: Nonce length in bytes
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- * @hdr: Header data to be authenticity protected
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- * @hdr_len: Length of the header data bytes
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- * @data: Data to encrypt in-place
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- * @data_len: Length of data in bytes
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- * @tag: 16-byte tag value
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- * Returns: 0 on success, -1 on failure
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- */
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-int aes_128_eax_encrypt(const u8 *key, const u8 *nonce, size_t nonce_len,
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- const u8 *hdr, size_t hdr_len,
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- u8 *data, size_t data_len, u8 *tag)
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-{
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- u8 *buf;
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- size_t buf_len;
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- u8 nonce_mac[BLOCK_SIZE], hdr_mac[BLOCK_SIZE], data_mac[BLOCK_SIZE];
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- int i, ret = -1;
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-
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- if (nonce_len > data_len)
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- buf_len = nonce_len;
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- else
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- buf_len = data_len;
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- if (hdr_len > buf_len)
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- buf_len = hdr_len;
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- buf_len += 16;
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-
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- buf = os_malloc(buf_len);
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- if (buf == NULL)
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- return -1;
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-
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- os_memset(buf, 0, 15);
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-
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- buf[15] = 0;
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- os_memcpy(buf + 16, nonce, nonce_len);
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- if (omac1_aes_128(key, buf, 16 + nonce_len, nonce_mac))
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- goto fail;
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-
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- buf[15] = 1;
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- os_memcpy(buf + 16, hdr, hdr_len);
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- if (omac1_aes_128(key, buf, 16 + hdr_len, hdr_mac))
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- goto fail;
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-
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- if (aes_128_ctr_encrypt(key, nonce_mac, data, data_len))
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- goto fail;
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- buf[15] = 2;
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- os_memcpy(buf + 16, data, data_len);
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- if (omac1_aes_128(key, buf, 16 + data_len, data_mac))
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- goto fail;
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-
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- for (i = 0; i < BLOCK_SIZE; i++)
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- tag[i] = nonce_mac[i] ^ data_mac[i] ^ hdr_mac[i];
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-
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- ret = 0;
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-fail:
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- os_free(buf);
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-
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- return ret;
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-}
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-
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-
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-/**
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- * aes_128_eax_decrypt - AES-128 EAX mode decryption
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- * @key: Key for decryption (16 bytes)
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- * @nonce: Nonce for counter mode
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- * @nonce_len: Nonce length in bytes
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- * @hdr: Header data to be authenticity protected
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- * @hdr_len: Length of the header data bytes
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- * @data: Data to encrypt in-place
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- * @data_len: Length of data in bytes
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- * @tag: 16-byte tag value
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- * Returns: 0 on success, -1 on failure, -2 if tag does not match
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- */
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-int aes_128_eax_decrypt(const u8 *key, const u8 *nonce, size_t nonce_len,
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- const u8 *hdr, size_t hdr_len,
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- u8 *data, size_t data_len, const u8 *tag)
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-{
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- u8 *buf;
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- size_t buf_len;
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- u8 nonce_mac[BLOCK_SIZE], hdr_mac[BLOCK_SIZE], data_mac[BLOCK_SIZE];
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- int i;
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-
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- if (nonce_len > data_len)
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- buf_len = nonce_len;
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- else
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- buf_len = data_len;
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- if (hdr_len > buf_len)
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- buf_len = hdr_len;
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- buf_len += 16;
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-
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- buf = os_malloc(buf_len);
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- if (buf == NULL)
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- return -1;
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-
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- os_memset(buf, 0, 15);
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-
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- buf[15] = 0;
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- os_memcpy(buf + 16, nonce, nonce_len);
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- if (omac1_aes_128(key, buf, 16 + nonce_len, nonce_mac)) {
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- os_free(buf);
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- return -1;
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- }
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-
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- buf[15] = 1;
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- os_memcpy(buf + 16, hdr, hdr_len);
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- if (omac1_aes_128(key, buf, 16 + hdr_len, hdr_mac)) {
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- os_free(buf);
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- return -1;
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- }
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-
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- buf[15] = 2;
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- os_memcpy(buf + 16, data, data_len);
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- if (omac1_aes_128(key, buf, 16 + data_len, data_mac)) {
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- os_free(buf);
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- return -1;
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- }
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-
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- os_free(buf);
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-
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- for (i = 0; i < BLOCK_SIZE; i++) {
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- if (tag[i] != (nonce_mac[i] ^ data_mac[i] ^ hdr_mac[i]))
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- return -2;
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- }
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-
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- return aes_128_ctr_encrypt(key, nonce_mac, data, data_len);
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-}
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-
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-#endif /* CONFIG_NO_AES_EAX */
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-
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-
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-#ifndef CONFIG_NO_AES_CBC
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-
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-/**
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- * aes_128_cbc_encrypt - AES-128 CBC encryption
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- * @key: Encryption key
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- * @iv: Encryption IV for CBC mode (16 bytes)
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- * @data: Data to encrypt in-place
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- * @data_len: Length of data in bytes (must be divisible by 16)
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- * Returns: 0 on success, -1 on failure
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- */
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-int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
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-{
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- void *ctx;
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- u8 cbc[BLOCK_SIZE];
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- u8 *pos = data;
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- int i, j, blocks;
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-
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- ctx = aes_encrypt_init(key, 16);
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- if (ctx == NULL)
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- return -1;
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- os_memcpy(cbc, iv, BLOCK_SIZE);
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-
|
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- blocks = data_len / BLOCK_SIZE;
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|
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- for (i = 0; i < blocks; i++) {
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|
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- for (j = 0; j < BLOCK_SIZE; j++)
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- cbc[j] ^= pos[j];
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- aes_encrypt(ctx, cbc, cbc);
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- os_memcpy(pos, cbc, BLOCK_SIZE);
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- pos += BLOCK_SIZE;
|
|
|
- }
|
|
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- aes_encrypt_deinit(ctx);
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|
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- return 0;
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|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/**
|
|
|
- * aes_128_cbc_decrypt - AES-128 CBC decryption
|
|
|
- * @key: Decryption key
|
|
|
- * @iv: Decryption IV for CBC mode (16 bytes)
|
|
|
- * @data: Data to decrypt in-place
|
|
|
- * @data_len: Length of data in bytes (must be divisible by 16)
|
|
|
- * Returns: 0 on success, -1 on failure
|
|
|
- */
|
|
|
-int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
|
|
|
-{
|
|
|
- void *ctx;
|
|
|
- u8 cbc[BLOCK_SIZE], tmp[BLOCK_SIZE];
|
|
|
- u8 *pos = data;
|
|
|
- int i, j, blocks;
|
|
|
-
|
|
|
- ctx = aes_decrypt_init(key, 16);
|
|
|
- if (ctx == NULL)
|
|
|
- return -1;
|
|
|
- os_memcpy(cbc, iv, BLOCK_SIZE);
|
|
|
-
|
|
|
- blocks = data_len / BLOCK_SIZE;
|
|
|
- for (i = 0; i < blocks; i++) {
|
|
|
- os_memcpy(tmp, pos, BLOCK_SIZE);
|
|
|
- aes_decrypt(ctx, pos, pos);
|
|
|
- for (j = 0; j < BLOCK_SIZE; j++)
|
|
|
- pos[j] ^= cbc[j];
|
|
|
- os_memcpy(cbc, tmp, BLOCK_SIZE);
|
|
|
- pos += BLOCK_SIZE;
|
|
|
- }
|
|
|
- aes_decrypt_deinit(ctx);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-#endif /* CONFIG_NO_AES_CBC */
|