280 lines
5.8 KiB
C
280 lines
5.8 KiB
C
/*
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* Copyright (C) 2018 Tobias Brunner
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* HSR Hochschule fuer Technik Rapperswil
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "botan_ed_private_key.h"
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#include "botan_ed_public_key.h"
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#include "botan_util.h"
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#include <botan/build.h>
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#ifdef BOTAN_HAS_ED25519
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#include <asn1/asn1.h>
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#include <utils/debug.h>
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typedef struct private_private_key_t private_private_key_t;
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#define ED25519_KEY_LEN 32
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/**
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* Private data
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*/
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struct private_private_key_t {
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/**
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* Public interface
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*/
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private_key_t public;
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/**
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* Botan private key object
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*/
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botan_privkey_t key;
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/**
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* Reference count
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*/
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refcount_t ref;
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};
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METHOD(private_key_t, sign, bool,
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private_private_key_t *this, signature_scheme_t scheme,
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void *params, chunk_t data, chunk_t *signature)
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{
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switch (scheme)
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{
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case SIGN_ED25519:
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return botan_get_signature(this->key, "Pure", data, signature);
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default:
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DBG1(DBG_LIB, "signature scheme %N not supported via botan",
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signature_scheme_names, scheme);
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return FALSE;
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}
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}
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METHOD(private_key_t, decrypt, bool,
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private_private_key_t *this, encryption_scheme_t scheme,
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chunk_t crypto, chunk_t *plain)
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{
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DBG1(DBG_LIB, "EdDSA private key decryption not implemented");
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return FALSE;
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}
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METHOD(private_key_t, get_keysize, int,
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private_private_key_t *this)
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{
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return ED25519_KEY_LEN * 8;
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}
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METHOD(private_key_t, get_type, key_type_t,
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private_private_key_t *this)
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{
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return KEY_ED25519;
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}
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METHOD(private_key_t, get_public_key, public_key_t*,
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private_private_key_t *this)
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{
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botan_pubkey_t pubkey;
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if (botan_privkey_export_pubkey(&pubkey, this->key))
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{
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return NULL;
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}
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return botan_ed_public_key_adopt(pubkey);
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}
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METHOD(private_key_t, get_fingerprint, bool,
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private_private_key_t *this, cred_encoding_type_t type,
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chunk_t *fingerprint)
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{
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botan_pubkey_t pubkey;
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bool success = FALSE;
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/* check the cache before doing the export */
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if (lib->encoding->get_cache(lib->encoding, type, this, fingerprint))
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{
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return TRUE;
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}
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if (botan_privkey_export_pubkey(&pubkey, this->key))
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{
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return FALSE;
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}
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success = botan_get_fingerprint(pubkey, this, type, fingerprint);
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botan_pubkey_destroy(pubkey);
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return success;
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}
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METHOD(private_key_t, get_encoding, bool,
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private_private_key_t *this, cred_encoding_type_t type,
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chunk_t *encoding)
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{
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return botan_get_privkey_encoding(this->key, type, encoding);
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}
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METHOD(private_key_t, get_ref, private_key_t*,
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private_private_key_t *this)
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{
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ref_get(&this->ref);
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return &this->public;
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}
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METHOD(private_key_t, destroy, void,
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private_private_key_t *this)
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{
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if (ref_put(&this->ref))
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{
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lib->encoding->clear_cache(lib->encoding, this);
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botan_privkey_destroy(this->key);
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free(this);
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}
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}
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/**
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* Internal generic constructor
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*/
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static private_private_key_t *create_empty()
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{
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private_private_key_t *this;
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INIT(this,
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.public = {
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.get_type = _get_type,
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.sign = _sign,
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.decrypt = _decrypt,
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.get_keysize = _get_keysize,
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.get_public_key = _get_public_key,
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.equals = private_key_equals,
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.belongs_to = private_key_belongs_to,
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.get_fingerprint = _get_fingerprint,
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.has_fingerprint = private_key_has_fingerprint,
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.get_encoding = _get_encoding,
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.get_ref = _get_ref,
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.destroy = _destroy,
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},
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.ref = 1,
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);
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return this;
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}
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/*
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* Described in header
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*/
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private_key_t *botan_ed_private_key_adopt(botan_privkey_t key)
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{
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private_private_key_t *this;
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this = create_empty();
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this->key = key;
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return &this->public;
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}
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/*
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* Described in header
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*/
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private_key_t *botan_ed_private_key_gen(key_type_t type, va_list args)
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{
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private_private_key_t *this;
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botan_rng_t rng;
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while (TRUE)
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{
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switch (va_arg(args, builder_part_t))
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{
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case BUILD_KEY_SIZE:
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/* just ignore the key size */
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va_arg(args, u_int);
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continue;
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case BUILD_END:
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break;
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default:
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return NULL;
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}
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break;
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}
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if (!botan_get_rng(&rng, RNG_TRUE))
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{
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return NULL;
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}
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this = create_empty();
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if (botan_privkey_create(&this->key, "Ed25519", NULL, rng))
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{
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DBG1(DBG_LIB, "EdDSA private key generation failed");
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botan_rng_destroy(rng);
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free(this);
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return NULL;
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}
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botan_rng_destroy(rng);
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return &this->public;
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}
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/*
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* Described in header
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*/
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private_key_t *botan_ed_private_key_load(key_type_t type, va_list args)
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{
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private_private_key_t *this;
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chunk_t key = chunk_empty;
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while (TRUE)
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{
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switch (va_arg(args, builder_part_t))
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{
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case BUILD_EDDSA_PRIV_ASN1_DER:
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key = va_arg(args, chunk_t);
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continue;
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case BUILD_END:
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break;
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default:
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return NULL;
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}
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break;
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}
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/* PKCS#8-encoded keys are handled generically, so we only handle the
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* explicit case */
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if (asn1_unwrap(&key, &key) != ASN1_OCTET_STRING ||
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key.len != ED25519_KEY_LEN)
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{
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return NULL;
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}
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this = create_empty();
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if (botan_privkey_load_ed25519(&this->key, key.ptr))
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{
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free(this);
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return NULL;
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}
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return &this->public;
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}
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#endif
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