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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2016, Intel Corporation
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* Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <crypto/ecdh.h>
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#include <crypto/kpp.h>
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#define ECDH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 2 * sizeof(short))
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static inline u8 *ecdh_pack_data(void *dst, const void *src, size_t sz)
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{
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memcpy(dst, src, sz);
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return dst + sz;
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}
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static inline const u8 *ecdh_unpack_data(void *dst, const void *src, size_t sz)
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{
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memcpy(dst, src, sz);
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return src + sz;
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}
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unsigned int crypto_ecdh_key_len(const struct ecdh *params)
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{
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return ECDH_KPP_SECRET_MIN_SIZE + params->key_size;
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}
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EXPORT_SYMBOL_GPL(crypto_ecdh_key_len);
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int crypto_ecdh_encode_key(char *buf, unsigned int len,
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const struct ecdh *params)
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{
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u8 *ptr = buf;
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struct kpp_secret secret = {
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.type = CRYPTO_KPP_SECRET_TYPE_ECDH,
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.len = len
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};
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if (unlikely(!buf))
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return -EINVAL;
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if (len != crypto_ecdh_key_len(params))
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return -EINVAL;
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ptr = ecdh_pack_data(ptr, &secret, sizeof(secret));
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ptr = ecdh_pack_data(ptr, ¶ms->curve_id, sizeof(params->curve_id));
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ptr = ecdh_pack_data(ptr, ¶ms->key_size, sizeof(params->key_size));
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ecdh_pack_data(ptr, params->key, params->key_size);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_ecdh_encode_key);
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int crypto_ecdh_decode_key(const char *buf, unsigned int len,
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struct ecdh *params)
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{
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const u8 *ptr = buf;
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struct kpp_secret secret;
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if (unlikely(!buf || len < ECDH_KPP_SECRET_MIN_SIZE))
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return -EINVAL;
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ptr = ecdh_unpack_data(&secret, ptr, sizeof(secret));
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if (secret.type != CRYPTO_KPP_SECRET_TYPE_ECDH)
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return -EINVAL;
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ptr = ecdh_unpack_data(¶ms->curve_id, ptr, sizeof(params->curve_id));
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ptr = ecdh_unpack_data(¶ms->key_size, ptr, sizeof(params->key_size));
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if (secret.len != crypto_ecdh_key_len(params))
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return -EINVAL;
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/* Don't allocate memory. Set pointer to data
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* within the given buffer
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*/
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params->key = (void *)ptr;
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_ecdh_decode_key);
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