mirror of
https://github.com/DrKLO/Telegram.git
synced 2024-12-22 22:45:18 +01:00
111 lines
3 KiB
C
111 lines
3 KiB
C
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/* Copyright (c) 2019, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <openssl/evp.h>
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#include <openssl/curve25519.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include "internal.h"
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// X25519 has no parameters to copy.
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static int pkey_x25519_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { return 1; }
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static int pkey_x25519_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
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X25519_KEY *key = OPENSSL_malloc(sizeof(X25519_KEY));
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if (key == NULL) {
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OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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if (!EVP_PKEY_set_type(pkey, EVP_PKEY_X25519)) {
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OPENSSL_free(key);
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return 0;
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}
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X25519_keypair(key->pub, key->priv);
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key->has_private = 1;
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OPENSSL_free(pkey->pkey.ptr);
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pkey->pkey.ptr = key;
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return 1;
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}
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static int pkey_x25519_derive(EVP_PKEY_CTX *ctx, uint8_t *out,
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size_t *out_len) {
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if (ctx->pkey == NULL || ctx->peerkey == NULL) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_KEYS_NOT_SET);
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return 0;
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}
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const X25519_KEY *our_key = ctx->pkey->pkey.ptr;
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const X25519_KEY *peer_key = ctx->peerkey->pkey.ptr;
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if (our_key == NULL || peer_key == NULL) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_KEYS_NOT_SET);
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return 0;
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}
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if (!our_key->has_private) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_NOT_A_PRIVATE_KEY);
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return 0;
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}
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if (out != NULL) {
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if (*out_len < 32) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL);
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return 0;
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}
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if (!X25519(out, our_key->priv, peer_key->pub)) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_PEER_KEY);
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return 0;
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}
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}
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*out_len = 32;
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return 1;
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}
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static int pkey_x25519_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) {
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switch (type) {
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case EVP_PKEY_CTRL_PEER_KEY:
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// |EVP_PKEY_derive_set_peer| requires the key implement this command,
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// even if it is a no-op.
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return 1;
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default:
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OPENSSL_PUT_ERROR(EVP, EVP_R_COMMAND_NOT_SUPPORTED);
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return 0;
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}
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}
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const EVP_PKEY_METHOD x25519_pkey_meth = {
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EVP_PKEY_X25519,
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NULL /* init */,
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pkey_x25519_copy,
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NULL /* cleanup */,
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pkey_x25519_keygen,
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NULL /* sign */,
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NULL /* sign_message */,
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NULL /* verify */,
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NULL /* verify_message */,
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NULL /* verify_recover */,
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NULL /* encrypt */,
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NULL /* decrypt */,
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pkey_x25519_derive,
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NULL /* paramgen */,
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pkey_x25519_ctrl,
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};
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