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)  * Copyright (c) 2016, Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <crypto/ecdh.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <crypto/kpp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #define ECDH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 2 * sizeof(short))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static inline u8 *ecdh_pack_data(void *dst, const void *src, size_t sz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	memcpy(dst, src, sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	return dst + sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static inline const u8 *ecdh_unpack_data(void *dst, const void *src, size_t sz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	memcpy(dst, src, sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	return src + sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) unsigned int crypto_ecdh_key_len(const struct ecdh *params)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	return ECDH_KPP_SECRET_MIN_SIZE + params->key_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) EXPORT_SYMBOL_GPL(crypto_ecdh_key_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int crypto_ecdh_encode_key(char *buf, unsigned int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 			   const struct ecdh *params)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	u8 *ptr = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	struct kpp_secret secret = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		.type = CRYPTO_KPP_SECRET_TYPE_ECDH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		.len = len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	if (unlikely(!buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	if (len != crypto_ecdh_key_len(params))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	ptr = ecdh_pack_data(ptr, &secret, sizeof(secret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	ptr = ecdh_pack_data(ptr, &params->curve_id, sizeof(params->curve_id));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	ptr = ecdh_pack_data(ptr, &params->key_size, sizeof(params->key_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	ecdh_pack_data(ptr, params->key, params->key_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) EXPORT_SYMBOL_GPL(crypto_ecdh_encode_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int crypto_ecdh_decode_key(const char *buf, unsigned int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 			   struct ecdh *params)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	const u8 *ptr = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	struct kpp_secret secret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	if (unlikely(!buf || len < ECDH_KPP_SECRET_MIN_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	ptr = ecdh_unpack_data(&secret, ptr, sizeof(secret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	if (secret.type != CRYPTO_KPP_SECRET_TYPE_ECDH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	if (unlikely(len < secret.len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	ptr = ecdh_unpack_data(&params->curve_id, ptr, sizeof(params->curve_id));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	ptr = ecdh_unpack_data(&params->key_size, ptr, sizeof(params->key_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	if (secret.len != crypto_ecdh_key_len(params))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	/* Don't allocate memory. Set pointer to data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	 * within the given buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	params->key = (void *)ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) EXPORT_SYMBOL_GPL(crypto_ecdh_decode_key);