^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/dh.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 DH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 4 * sizeof(int))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static inline u8 *dh_pack_data(u8 *dst, u8 *end, const void *src, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) if (!dst || size > end - dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) memcpy(dst, src, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) return dst + size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static inline const u8 *dh_unpack_data(void *dst, const void *src, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) memcpy(dst, src, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) return src + size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static inline unsigned int dh_data_size(const struct dh *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) return p->key_size + p->p_size + p->q_size + p->g_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) unsigned int crypto_dh_key_len(const struct dh *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return DH_KPP_SECRET_MIN_SIZE + dh_data_size(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) EXPORT_SYMBOL_GPL(crypto_dh_key_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) int crypto_dh_encode_key(char *buf, unsigned int len, const struct dh *params)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) u8 *ptr = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) u8 * const end = ptr + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct kpp_secret secret = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) .type = CRYPTO_KPP_SECRET_TYPE_DH,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) .len = len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (unlikely(!len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) ptr = dh_pack_data(ptr, end, &secret, sizeof(secret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) ptr = dh_pack_data(ptr, end, ¶ms->key_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) sizeof(params->key_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ptr = dh_pack_data(ptr, end, ¶ms->p_size, sizeof(params->p_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) ptr = dh_pack_data(ptr, end, ¶ms->q_size, sizeof(params->q_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ptr = dh_pack_data(ptr, end, ¶ms->g_size, sizeof(params->g_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) ptr = dh_pack_data(ptr, end, params->key, params->key_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ptr = dh_pack_data(ptr, end, params->p, params->p_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ptr = dh_pack_data(ptr, end, params->q, params->q_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ptr = dh_pack_data(ptr, end, params->g, params->g_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (ptr != end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) EXPORT_SYMBOL_GPL(crypto_dh_encode_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int crypto_dh_decode_key(const char *buf, unsigned int len, struct dh *params)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) const u8 *ptr = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct kpp_secret secret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (unlikely(!buf || len < DH_KPP_SECRET_MIN_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) ptr = dh_unpack_data(&secret, ptr, sizeof(secret));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (secret.type != CRYPTO_KPP_SECRET_TYPE_DH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) ptr = dh_unpack_data(¶ms->key_size, ptr, sizeof(params->key_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) ptr = dh_unpack_data(¶ms->p_size, ptr, sizeof(params->p_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ptr = dh_unpack_data(¶ms->q_size, ptr, sizeof(params->q_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) ptr = dh_unpack_data(¶ms->g_size, ptr, sizeof(params->g_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (secret.len != crypto_dh_key_len(params))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * Don't permit the buffer for 'key' or 'g' to be larger than 'p', since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * some drivers assume otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (params->key_size > params->p_size ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) params->g_size > params->p_size || params->q_size > params->p_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) /* Don't allocate memory. Set pointers to data within
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * the given buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) params->key = (void *)ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) params->p = (void *)(ptr + params->key_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) params->q = (void *)(ptr + params->key_size + params->p_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) params->g = (void *)(ptr + params->key_size + params->p_size +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) params->q_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * Don't permit 'p' to be 0. It's not a prime number, and it's subject
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * to corner cases such as 'mod 0' being undefined or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * crypto_kpp_maxsize() returning 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (memchr_inv(params->p, 0, params->p_size) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* It is permissible to not provide Q. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (params->q_size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) params->q = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) EXPORT_SYMBOL_GPL(crypto_dh_decode_key);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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