Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * The ChaCha stream cipher (RFC7539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 2015 Martin Willi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <crypto/algapi.h> // for crypto_xor_cpy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <crypto/chacha.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) void chacha_crypt_generic(u32 *state, u8 *dst, const u8 *src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 			  unsigned int bytes, int nrounds)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	/* aligned to potentially speed up crypto_xor() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	u8 stream[CHACHA_BLOCK_SIZE] __aligned(sizeof(long));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	while (bytes >= CHACHA_BLOCK_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 		chacha_block_generic(state, stream, nrounds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		crypto_xor_cpy(dst, src, stream, CHACHA_BLOCK_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		bytes -= CHACHA_BLOCK_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		dst += CHACHA_BLOCK_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		src += CHACHA_BLOCK_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (bytes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		chacha_block_generic(state, stream, nrounds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		crypto_xor_cpy(dst, src, stream, bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) EXPORT_SYMBOL(chacha_crypt_generic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) MODULE_LICENSE("GPL");