1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2023 Stormshield 5 * Copyright (c) 2023 Semihalf 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer, 12 * without modification. 13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 15 * redistribution must be conditioned upon including a substantially 16 * similar Disclaimer requirement for further binary redistribution. 17 * 18 * NO WARRANTY 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 23 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 24 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 27 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 29 * THE POSSIBILITY OF SUCH DAMAGES. 30 */ 31 32 #ifndef __OSSL_ARM__ 33 #define __OSSL_ARM__ 34 35 #include <crypto/openssl/ossl.h> 36 #include <crypto/openssl/ossl_cipher.h> 37 38 #include <opencrypto/cryptodev.h> 39 40 struct bsaes_key { 41 struct ossl_aes_keysched ks; 42 int converted; 43 #define BSAES_KEY_SIZE (128 * (RIJNDAEL_MAXNR - 1) + 2 * AES_BLOCK_LEN) 44 uint8_t bitslice[BSAES_KEY_SIZE] __aligned(8); 45 } __aligned(8); 46 47 ossl_cipher_encrypt_t ossl_bsaes_cbc_encrypt; 48 49 void AES_encrypt(const void *, void *, const void *); 50 51 static inline void 52 AES_CBC_ENCRYPT(const unsigned char *in, unsigned char *out, 53 size_t length, const void *key, unsigned char *iv, int encrypt) 54 { 55 struct bsaes_key bsks; 56 uint32_t iv32[4], scratch[4]; 57 58 /* 59 * bsaes_cbc_encrypt has some special requirements w.r.t input data. 60 * The key buffer, that normally holds round keys is used as a scratch 61 * space. 128 bytes per round of extra space is required. 62 * Another thing is that only decryption is supported. 63 * In the case of encryption block chaining has to be done in C. 64 */ 65 if (!encrypt) { 66 memcpy(&bsks.ks, key, sizeof(bsks.ks)); 67 bsks.converted = 0; 68 ossl_bsaes_cbc_encrypt(in, out, length, &bsks, iv, false); 69 return; 70 } 71 72 length /= AES_BLOCK_LEN; 73 memcpy(iv32, iv, AES_BLOCK_LEN); 74 75 while (length-- > 0) { 76 memcpy(scratch, in, AES_BLOCK_LEN); 77 78 /* XOR plaintext with IV. */ 79 scratch[0] ^= iv32[0]; 80 scratch[1] ^= iv32[1]; 81 scratch[2] ^= iv32[2]; 82 scratch[3] ^= iv32[3]; 83 84 AES_encrypt(scratch, out, key); 85 86 memcpy(iv32, out, AES_BLOCK_LEN); 87 in += AES_BLOCK_LEN; 88 out += AES_BLOCK_LEN; 89 } 90 91 memcpy(iv, iv32, AES_BLOCK_LEN); 92 } 93 94 #endif /* __OSSL_ARM__ */ 95