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Linux/crypto/ecdh_helper.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * Copyright (c) 2016, Intel Corporation
  4  * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
  5  */
  6 #include <linux/kernel.h>
  7 #include <linux/export.h>
  8 #include <linux/err.h>
  9 #include <linux/string.h>
 10 #include <crypto/ecdh.h>
 11 #include <crypto/kpp.h>
 12 
 13 #define ECDH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + sizeof(short))
 14 
 15 static inline u8 *ecdh_pack_data(void *dst, const void *src, size_t sz)
 16 {
 17         memcpy(dst, src, sz);
 18         return dst + sz;
 19 }
 20 
 21 static inline const u8 *ecdh_unpack_data(void *dst, const void *src, size_t sz)
 22 {
 23         memcpy(dst, src, sz);
 24         return src + sz;
 25 }
 26 
 27 unsigned int crypto_ecdh_key_len(const struct ecdh *params)
 28 {
 29         return ECDH_KPP_SECRET_MIN_SIZE + params->key_size;
 30 }
 31 EXPORT_SYMBOL_GPL(crypto_ecdh_key_len);
 32 
 33 int crypto_ecdh_encode_key(char *buf, unsigned int len,
 34                            const struct ecdh *params)
 35 {
 36         u8 *ptr = buf;
 37         struct kpp_secret secret = {
 38                 .type = CRYPTO_KPP_SECRET_TYPE_ECDH,
 39                 .len = len
 40         };
 41 
 42         if (unlikely(!buf))
 43                 return -EINVAL;
 44 
 45         if (len != crypto_ecdh_key_len(params))
 46                 return -EINVAL;
 47 
 48         ptr = ecdh_pack_data(ptr, &secret, sizeof(secret));
 49         ptr = ecdh_pack_data(ptr, &params->key_size, sizeof(params->key_size));
 50         ecdh_pack_data(ptr, params->key, params->key_size);
 51 
 52         return 0;
 53 }
 54 EXPORT_SYMBOL_GPL(crypto_ecdh_encode_key);
 55 
 56 int crypto_ecdh_decode_key(const char *buf, unsigned int len,
 57                            struct ecdh *params)
 58 {
 59         const u8 *ptr = buf;
 60         struct kpp_secret secret;
 61 
 62         if (unlikely(!buf || len < ECDH_KPP_SECRET_MIN_SIZE))
 63                 return -EINVAL;
 64 
 65         ptr = ecdh_unpack_data(&secret, ptr, sizeof(secret));
 66         if (secret.type != CRYPTO_KPP_SECRET_TYPE_ECDH)
 67                 return -EINVAL;
 68 
 69         if (unlikely(len < secret.len))
 70                 return -EINVAL;
 71 
 72         ptr = ecdh_unpack_data(&params->key_size, ptr, sizeof(params->key_size));
 73         if (secret.len != crypto_ecdh_key_len(params))
 74                 return -EINVAL;
 75 
 76         /* Don't allocate memory. Set pointer to data
 77          * within the given buffer
 78          */
 79         params->key = (void *)ptr;
 80 
 81         return 0;
 82 }
 83 EXPORT_SYMBOL_GPL(crypto_ecdh_decode_key);
 84 

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