406 lines
9.9 KiB
C
406 lines
9.9 KiB
C
/*
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* Copyright (C) 2009 Martin Willi
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* Copyright (C) 2008 Tobias Brunner
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "openssl_ec_private_key.h"
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#include "openssl_ec_public_key.h"
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#include "openssl_util.h"
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#include <debug.h>
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#include <openssl/evp.h>
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#include <openssl/ecdsa.h>
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#include <openssl/x509.h>
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typedef struct private_openssl_ec_private_key_t private_openssl_ec_private_key_t;
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/**
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* Private data of a openssl_ec_private_key_t object.
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*/
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struct private_openssl_ec_private_key_t {
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/**
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* Public interface for this signer.
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*/
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openssl_ec_private_key_t public;
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/**
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* EC key object
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*/
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EC_KEY *ec;
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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 ec public key */
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bool openssl_ec_fingerprint(EC_KEY *ec, key_encoding_type_t type, chunk_t *fp);
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/**
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* Build a signature as in RFC 4754
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*/
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static bool build_signature(private_openssl_ec_private_key_t *this,
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chunk_t hash, chunk_t *signature)
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{
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bool built = FALSE;
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ECDSA_SIG *sig;
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sig = ECDSA_do_sign(hash.ptr, hash.len, this->ec);
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if (sig)
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{
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/* concatenate BNs r/s to a signature chunk */
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built = openssl_bn_cat(EC_FIELD_ELEMENT_LEN(EC_KEY_get0_group(this->ec)),
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sig->r, sig->s, signature);
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ECDSA_SIG_free(sig);
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}
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return built;
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}
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/**
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* Build a RFC 4754 signature for a specified curve and hash algorithm
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*/
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static bool build_curve_signature(private_openssl_ec_private_key_t *this,
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signature_scheme_t scheme, int nid_hash,
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int nid_curve, chunk_t data, chunk_t *signature)
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{
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const EC_GROUP *my_group;
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EC_GROUP *req_group;
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chunk_t hash;
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bool built;
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req_group = EC_GROUP_new_by_curve_name(nid_curve);
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if (!req_group)
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{
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DBG1(DBG_LIB, "signature scheme %N not supported in EC (required curve "
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"not supported)", signature_scheme_names, scheme);
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return FALSE;
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}
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my_group = EC_KEY_get0_group(this->ec);
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if (EC_GROUP_cmp(my_group, req_group, NULL) != 0)
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{
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DBG1(DBG_LIB, "signature scheme %N not supported by private key",
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signature_scheme_names, scheme);
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return FALSE;
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}
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EC_GROUP_free(req_group);
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if (!openssl_hash_chunk(nid_hash, data, &hash))
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{
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return FALSE;
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}
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built = build_signature(this, hash, signature);
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chunk_free(&hash);
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return built;
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}
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/**
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* Build a DER encoded signature as in RFC 3279
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*/
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static bool build_der_signature(private_openssl_ec_private_key_t *this,
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int hash_nid, chunk_t data, chunk_t *signature)
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{
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chunk_t hash, sig;
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int siglen = 0;
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bool built;
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if (!openssl_hash_chunk(hash_nid, data, &hash))
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{
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return FALSE;
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}
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sig = chunk_alloc(ECDSA_size(this->ec));
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built = ECDSA_sign(0, hash.ptr, hash.len, sig.ptr, &siglen, this->ec) == 1;
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sig.len = siglen;
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if (built)
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{
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*signature = sig;
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}
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else
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{
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free(sig.ptr);
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}
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free(hash.ptr);
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return built;
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}
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/**
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* Implementation of private_key_t.sign.
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*/
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static bool sign(private_openssl_ec_private_key_t *this,
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signature_scheme_t scheme, 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_ECDSA_WITH_NULL:
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return build_signature(this, data, signature);
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case SIGN_ECDSA_WITH_SHA1_DER:
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return build_der_signature(this, NID_sha1, data, signature);
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case SIGN_ECDSA_WITH_SHA256_DER:
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return build_der_signature(this, NID_sha256, data, signature);
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case SIGN_ECDSA_WITH_SHA384_DER:
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return build_der_signature(this, NID_sha384, data, signature);
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case SIGN_ECDSA_WITH_SHA512_DER:
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return build_der_signature(this, NID_sha512, data, signature);
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case SIGN_ECDSA_256:
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return build_curve_signature(this, scheme, NID_sha256,
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NID_X9_62_prime256v1, data, signature);
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case SIGN_ECDSA_384:
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return build_curve_signature(this, scheme, NID_sha384,
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NID_secp384r1, data, signature);
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case SIGN_ECDSA_521:
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return build_curve_signature(this, scheme, NID_sha512,
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NID_secp521r1, data, signature);
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default:
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DBG1(DBG_LIB, "signature scheme %N not supported",
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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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/**
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* Implementation of private_key_t.destroy.
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*/
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static bool decrypt(private_openssl_ec_private_key_t *this,
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chunk_t crypto, chunk_t *plain)
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{
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DBG1(DBG_LIB, "EC private key decryption not implemented");
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return FALSE;
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}
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/**
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* Implementation of private_key_t.get_keysize.
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*/
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static size_t get_keysize(private_openssl_ec_private_key_t *this)
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{
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return EC_FIELD_ELEMENT_LEN(EC_KEY_get0_group(this->ec));
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}
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/**
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* Implementation of private_key_t.get_type.
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*/
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static key_type_t get_type(private_openssl_ec_private_key_t *this)
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{
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return KEY_ECDSA;
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}
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/**
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* Implementation of private_key_t.get_public_key.
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*/
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static public_key_t* get_public_key(private_openssl_ec_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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u_char *p;
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key = chunk_alloc(i2d_EC_PUBKEY(this->ec, NULL));
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p = key.ptr;
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i2d_EC_PUBKEY(this->ec, &p);
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public = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_ECDSA,
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BUILD_BLOB_ASN1_DER, key, BUILD_END);
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free(key.ptr);
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return public;
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}
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/**
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* Implementation of private_key_t.get_fingerprint.
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*/
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static bool get_fingerprint(private_openssl_ec_private_key_t *this,
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key_encoding_type_t type, chunk_t *fingerprint)
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{
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return openssl_ec_fingerprint(this->ec, type, fingerprint);
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}
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/**
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* Implementation of private_key_t.get_encoding.
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*/
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static bool get_encoding(private_openssl_ec_private_key_t *this,
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key_encoding_type_t type, chunk_t *encoding)
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{
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u_char *p;
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switch (type)
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{
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case KEY_PRIV_ASN1_DER:
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case KEY_PRIV_PEM:
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{
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bool success = TRUE;
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*encoding = chunk_alloc(i2d_ECPrivateKey(this->ec, NULL));
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p = encoding->ptr;
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i2d_ECPrivateKey(this->ec, &p);
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if (type == KEY_PRIV_PEM)
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{
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chunk_t asn1_encoding = *encoding;
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success = lib->encoding->encode(lib->encoding, KEY_PRIV_PEM,
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NULL, encoding, KEY_PART_ECDSA_PRIV_ASN1_DER,
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asn1_encoding, KEY_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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/**
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* Implementation of private_key_t.get_ref.
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*/
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static private_key_t* get_ref(private_openssl_ec_private_key_t *this)
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{
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ref_get(&this->ref);
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return &this->public.interface;
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}
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/**
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* Implementation of private_key_t.destroy.
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*/
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static void destroy(private_openssl_ec_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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if (this->ec)
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{
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lib->encoding->clear_cache(lib->encoding, this->ec);
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EC_KEY_free(this->ec);
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}
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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_openssl_ec_private_key_t *create_empty(void)
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{
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private_openssl_ec_private_key_t *this = malloc_thing(private_openssl_ec_private_key_t);
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this->public.interface.get_type = (key_type_t (*)(private_key_t *this))get_type;
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this->public.interface.sign = (bool (*)(private_key_t *this, signature_scheme_t scheme, chunk_t data, chunk_t *signature))sign;
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this->public.interface.decrypt = (bool (*)(private_key_t *this, chunk_t crypto, chunk_t *plain))decrypt;
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this->public.interface.get_keysize = (size_t (*) (private_key_t *this))get_keysize;
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this->public.interface.get_public_key = (public_key_t* (*)(private_key_t *this))get_public_key;
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this->public.interface.equals = private_key_equals;
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this->public.interface.belongs_to = private_key_belongs_to;
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this->public.interface.get_fingerprint = (bool(*)(private_key_t*, key_encoding_type_t type, chunk_t *fp))get_fingerprint;
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this->public.interface.has_fingerprint = (bool(*)(private_key_t*, chunk_t fp))private_key_has_fingerprint;
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this->public.interface.get_encoding = (bool(*)(private_key_t*, key_encoding_type_t type, chunk_t *encoding))get_encoding;
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this->public.interface.get_ref = (private_key_t* (*)(private_key_t *this))get_ref;
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this->public.interface.destroy = (void (*)(private_key_t *this))destroy;
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this->ec = NULL;
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this->ref = 1;
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return this;
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}
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/**
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* See header.
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*/
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openssl_ec_private_key_t *openssl_ec_private_key_gen(key_type_t type,
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va_list args)
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{
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private_openssl_ec_private_key_t *this;
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u_int key_size = 0;
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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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key_size = 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 (!key_size)
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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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switch (key_size)
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{
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case 256:
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this->ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
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break;
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case 384:
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this->ec = EC_KEY_new_by_curve_name(NID_secp384r1);
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break;
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case 521:
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this->ec = EC_KEY_new_by_curve_name(NID_secp521r1);
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break;
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default:
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DBG1(DBG_LIB, "EC private key size %d not supported", key_size);
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destroy(this);
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return NULL;
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}
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if (EC_KEY_generate_key(this->ec) != 1)
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{
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DBG1(DBG_LIB, "EC private key generation failed", key_size);
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destroy(this);
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return NULL;
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}
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/* encode as a named curve key (no parameters), uncompressed public key */
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EC_KEY_set_asn1_flag(this->ec, OPENSSL_EC_NAMED_CURVE);
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EC_KEY_set_conv_form(this->ec, POINT_CONVERSION_UNCOMPRESSED);
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return &this->public;
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}
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/**
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* See header.
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*/
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openssl_ec_private_key_t *openssl_ec_private_key_load(key_type_t type,
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va_list args)
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{
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private_openssl_ec_private_key_t *this;
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chunk_t blob = 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_BLOB_ASN1_DER:
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blob = 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_empty();
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this->ec = d2i_ECPrivateKey(NULL, (const u_char**)&blob.ptr, blob.len);
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if (!this->ec)
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{
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destroy(this);
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return NULL;
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}
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if (!EC_KEY_check_key(this->ec))
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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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