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![Thomas Gleixner](/assets/img/avatar_default.png)
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>
118 lines
3.4 KiB
C
118 lines
3.4 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/dh.h>
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#include <crypto/kpp.h>
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#define DH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 4 * sizeof(int))
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static inline u8 *dh_pack_data(u8 *dst, u8 *end, const void *src, size_t size)
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{
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if (!dst || size > end - dst)
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return NULL;
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memcpy(dst, src, size);
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return dst + size;
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}
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static inline const u8 *dh_unpack_data(void *dst, const void *src, size_t size)
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{
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memcpy(dst, src, size);
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return src + size;
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}
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static inline unsigned int dh_data_size(const struct dh *p)
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{
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return p->key_size + p->p_size + p->q_size + p->g_size;
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}
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unsigned int crypto_dh_key_len(const struct dh *p)
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{
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return DH_KPP_SECRET_MIN_SIZE + dh_data_size(p);
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}
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EXPORT_SYMBOL_GPL(crypto_dh_key_len);
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int crypto_dh_encode_key(char *buf, unsigned int len, const struct dh *params)
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{
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u8 *ptr = buf;
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u8 * const end = ptr + len;
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struct kpp_secret secret = {
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.type = CRYPTO_KPP_SECRET_TYPE_DH,
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.len = len
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};
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if (unlikely(!len))
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return -EINVAL;
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ptr = dh_pack_data(ptr, end, &secret, sizeof(secret));
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ptr = dh_pack_data(ptr, end, ¶ms->key_size,
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sizeof(params->key_size));
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ptr = dh_pack_data(ptr, end, ¶ms->p_size, sizeof(params->p_size));
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ptr = dh_pack_data(ptr, end, ¶ms->q_size, sizeof(params->q_size));
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ptr = dh_pack_data(ptr, end, ¶ms->g_size, sizeof(params->g_size));
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ptr = dh_pack_data(ptr, end, params->key, params->key_size);
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ptr = dh_pack_data(ptr, end, params->p, params->p_size);
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ptr = dh_pack_data(ptr, end, params->q, params->q_size);
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ptr = dh_pack_data(ptr, end, params->g, params->g_size);
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if (ptr != end)
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return -EINVAL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_dh_encode_key);
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int crypto_dh_decode_key(const char *buf, unsigned int len, struct dh *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 < DH_KPP_SECRET_MIN_SIZE))
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return -EINVAL;
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ptr = dh_unpack_data(&secret, ptr, sizeof(secret));
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if (secret.type != CRYPTO_KPP_SECRET_TYPE_DH)
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return -EINVAL;
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ptr = dh_unpack_data(¶ms->key_size, ptr, sizeof(params->key_size));
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ptr = dh_unpack_data(¶ms->p_size, ptr, sizeof(params->p_size));
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ptr = dh_unpack_data(¶ms->q_size, ptr, sizeof(params->q_size));
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ptr = dh_unpack_data(¶ms->g_size, ptr, sizeof(params->g_size));
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if (secret.len != crypto_dh_key_len(params))
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return -EINVAL;
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/*
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* Don't permit the buffer for 'key' or 'g' to be larger than 'p', since
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* some drivers assume otherwise.
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*/
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if (params->key_size > params->p_size ||
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params->g_size > params->p_size || params->q_size > params->p_size)
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return -EINVAL;
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/* Don't allocate memory. Set pointers to data within
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* the given buffer
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*/
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params->key = (void *)ptr;
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params->p = (void *)(ptr + params->key_size);
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params->q = (void *)(ptr + params->key_size + params->p_size);
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params->g = (void *)(ptr + params->key_size + params->p_size +
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params->q_size);
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/*
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* Don't permit 'p' to be 0. It's not a prime number, and it's subject
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* to corner cases such as 'mod 0' being undefined or
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* crypto_kpp_maxsize() returning 0.
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*/
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if (memchr_inv(params->p, 0, params->p_size) == NULL)
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return -EINVAL;
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/* It is permissible to not provide Q. */
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if (params->q_size == 0)
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params->q = NULL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_dh_decode_key);
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