355 lines
7.4 KiB
C
355 lines
7.4 KiB
C
/*
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* Copyright (C) 2019 Sean Parkinson, wolfSSL Inc.
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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 "wolfssl_common.h"
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#ifdef HAVE_ED25519
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#include "wolfssl_ed_private_key.h"
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#include <utils/debug.h>
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#include <wolfssl/wolfcrypt/ed25519.h>
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#include <wolfssl/wolfcrypt/asn.h>
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typedef struct private_private_key_t private_private_key_t;
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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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* Key object
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*/
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ed25519_key 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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/* from ed public key */
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bool wolfssl_ed_fingerprint(ed25519_key *key, cred_encoding_type_t type,
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chunk_t *fp);
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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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word32 len;
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byte dummy[1];
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int ret;
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if (scheme != SIGN_ED25519)
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{
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DBG1(DBG_LIB, "signature scheme %N not supported by %N key",
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signature_scheme_names, scheme, key_type_names, KEY_ED25519);
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return FALSE;
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}
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if (!data.ptr && !data.len)
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{
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data.ptr = dummy;
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}
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len = ED25519_SIG_SIZE;
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*signature = chunk_alloc(len);
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ret = wc_ed25519_sign_msg(data.ptr, data.len, signature->ptr, &len,
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&this->key);
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return ret == 0;
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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_SIZE * 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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public_key_t *public;
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chunk_t key;
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word32 len = ED25519_PUB_KEY_SIZE;
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key = chunk_alloca(len);
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if (wc_ed25519_export_public(&this->key, key.ptr, &len) != 0)
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{
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return NULL;
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}
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public = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_ED25519,
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BUILD_EDDSA_PUB, key, BUILD_END);
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return public;
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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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return wolfssl_ed_fingerprint(&this->key, type, fingerprint);
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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, chunk_t *encoding)
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{
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int ret;
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switch (type)
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{
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case PRIVKEY_ASN1_DER:
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case PRIVKEY_PEM:
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{
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bool success = TRUE;
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/* +4 is for the two octet strings */
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*encoding = chunk_alloc(ED25519_PRV_KEY_SIZE + 2 * MAX_SEQ_SZ +
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MAX_VERSION_SZ + MAX_ALGO_SZ + 4);
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ret = wc_Ed25519PrivateKeyToDer(&this->key, encoding->ptr,
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encoding->len);
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if (ret < 0)
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{
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chunk_free(encoding);
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return FALSE;
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}
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encoding->len = ret;
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if (type == PRIVKEY_PEM)
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{
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chunk_t asn1_encoding = *encoding;
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success = lib->encoding->encode(lib->encoding, PRIVKEY_PEM,
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NULL, encoding, CRED_PART_EDDSA_PRIV_ASN1_DER,
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asn1_encoding, CRED_PART_END);
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chunk_clear(&asn1_encoding);
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}
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return success;
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}
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default:
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return FALSE;
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}
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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->key);
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wc_ed25519_free(&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_internal()
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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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if (wc_ed25519_init(&this->key) != 0)
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{
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free(this);
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this = NULL;
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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 *wolfssl_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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WC_RNG rng;
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int ret;
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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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this = create_internal();
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if (!this)
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{
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return NULL;
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}
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if (wc_InitRng(&rng) != 0)
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{
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DBG1(DBG_LIB, "initializing random failed");
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destroy(this);
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return NULL;
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}
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ret = wc_ed25519_make_key(&rng, ED25519_KEY_SIZE, &this->key);
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wc_FreeRng(&rng);
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if (ret < 0)
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{
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DBG1(DBG_LIB, "generating %N key failed", key_type_names, type);
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destroy(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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/**
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* Fix the internal state if only the private key is set
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*/
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static int set_public_key(private_private_key_t *this)
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{
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int ret = 0;
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if (!this->key.pubKeySet)
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{
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ret = wc_ed25519_make_public(&this->key, this->key.p,
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ED25519_PUB_KEY_SIZE);
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if (ret == 0)
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{
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/* put public key after private key in the same buffer */
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memmove(this->key.k + ED25519_KEY_SIZE, this->key.p,
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ED25519_PUB_KEY_SIZE);
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this->key.pubKeySet = 1;
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}
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}
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return ret;
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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 *wolfssl_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 blob = chunk_empty, priv = chunk_empty;
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int idx;
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int ret = -1;
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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_BLOB_ASN1_DER:
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blob = va_arg(args, chunk_t);
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continue;
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case BUILD_EDDSA_PRIV_ASN1_DER:
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priv = 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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this = create_internal();
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if (!this)
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{
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return NULL;
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}
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if (priv.len)
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{
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/* check for ASN.1 wrapped key (Octet String == 0x04) */
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if (priv.len == ED25519_KEY_SIZE + 2 && priv.ptr[0] == 0x04 &&
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priv.ptr[1] == ED25519_KEY_SIZE)
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{
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priv = chunk_skip(priv, 2);
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}
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ret = wc_ed25519_import_private_only(priv.ptr, priv.len, &this->key);
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}
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else if (blob.len)
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{
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idx = 0;
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ret = wc_Ed25519PrivateKeyDecode(blob.ptr, &idx, &this->key, blob.len);
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}
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if (ret == 0)
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{
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ret = set_public_key(this);
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}
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if (ret != 0)
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{
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destroy(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 /* HAVE_ED25519 */
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