RSA with OpenSSL
This commit is contained in:
Tobias Brunner
parent
144274ab20
commit
84770ded1e
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@ -8,7 +8,9 @@ plugin_LTLIBRARIES = libstrongswan-openssl.la
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libstrongswan_openssl_la_SOURCES = openssl_plugin.h openssl_plugin.c \
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openssl_crypter.c openssl_crypter.h \
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openssl_hasher.c openssl_hasher.h \
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openssl_diffie_hellman.c openssl_diffie_hellman.h
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openssl_diffie_hellman.c openssl_diffie_hellman.h \
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openssl_rsa_private_key.c openssl_rsa_private_key.h \
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openssl_rsa_public_key.c openssl_rsa_public_key.h
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libstrongswan_openssl_la_LDFLAGS = -module
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libstrongswan_openssl_la_LIBADD = -lssl
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@ -23,6 +23,8 @@
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#include "openssl_crypter.h"
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#include "openssl_hasher.h"
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#include "openssl_diffie_hellman.h"
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#include "openssl_rsa_private_key.h"
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#include "openssl_rsa_public_key.h"
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typedef struct private_openssl_plugin_t private_openssl_plugin_t;
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@ -48,6 +50,10 @@ static void destroy(private_openssl_plugin_t *this)
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(hasher_constructor_t)openssl_hasher_create);
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lib->crypto->remove_dh(lib->crypto,
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(dh_constructor_t)openssl_diffie_hellman_create);
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lib->creds->remove_builder(lib->creds,
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(builder_constructor_t)openssl_rsa_private_key_builder);
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lib->creds->remove_builder(lib->creds,
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(builder_constructor_t)openssl_rsa_public_key_builder);
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EVP_cleanup();
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@ -115,5 +121,11 @@ plugin_t *plugin_create()
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lib->crypto->add_dh(lib->crypto, MODP_8192_BIT,
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(dh_constructor_t)openssl_diffie_hellman_create);
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/* rsa */
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lib->creds->add_builder(lib->creds, CRED_PRIVATE_KEY, KEY_RSA,
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(builder_constructor_t)openssl_rsa_private_key_builder);
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lib->creds->add_builder(lib->creds, CRED_PUBLIC_KEY, KEY_RSA,
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(builder_constructor_t)openssl_rsa_public_key_builder);
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return &this->public.plugin;
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}
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@ -0,0 +1,422 @@
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/*
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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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* $Id$
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*/
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#include "openssl_rsa_private_key.h"
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#include "openssl_rsa_public_key.h"
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#include <debug.h>
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#include <openssl/evp.h>
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#include <openssl/rsa.h>
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/**
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* Public exponent to use for key generation.
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*/
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#define PUBLIC_EXPONENT 0x10001
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typedef struct private_openssl_rsa_private_key_t private_openssl_rsa_private_key_t;
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/**
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* Private data of a openssl_rsa_private_key_t object.
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*/
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struct private_openssl_rsa_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_rsa_private_key_t public;
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/**
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* RSA object from OpenSSL
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*/
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RSA *rsa;
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/**
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* Keyid formed as a SHA-1 hash of a privateKey object
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*/
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identification_t* keyid;
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/**
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* Keyid formed as a SHA-1 hash of a privateKeyInfo object
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*/
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identification_t* keyid_info;
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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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/**
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* shared functions, implemented in openssl_rsa_public_key.c
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*/
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bool openssl_rsa_public_key_build_id(RSA *rsa, identification_t **keyid,
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identification_t **keyid_info);
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openssl_rsa_public_key_t *openssl_rsa_public_key_create_from_n_e(BIGNUM *n, BIGNUM *e);
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/**
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* Build an EMPSA PKCS1 signature described in PKCS#1
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*/
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static bool build_emsa_pkcs1_signature(private_openssl_rsa_private_key_t *this,
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int type, chunk_t data, chunk_t *signature)
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{
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bool success = FALSE;
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const EVP_MD *hasher = EVP_get_digestbynid(type);
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if (!hasher)
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{
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return FALSE;
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}
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EVP_MD_CTX *ctx = EVP_MD_CTX_create();
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EVP_PKEY *key = EVP_PKEY_new();
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if (!ctx || !key)
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{
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goto error;
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}
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if (!EVP_PKEY_set1_RSA(key, this->rsa))
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{
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goto error;
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}
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if (!EVP_SignInit_ex(ctx, hasher, NULL))
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{
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goto error;
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}
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if (!EVP_SignUpdate(ctx, data.ptr, data.len))
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{
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goto error;
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}
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*signature = chunk_alloc(RSA_size(this->rsa));
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if (!EVP_SignFinal(ctx, signature->ptr, &signature->len, key))
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{
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goto error;
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}
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success = TRUE;
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error:
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if (key)
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{
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EVP_PKEY_free(key);
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}
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if (ctx)
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{
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EVP_MD_CTX_destroy(ctx);
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}
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return success;
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}
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/**
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* Implementation of openssl_rsa_private_key.destroy.
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*/
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static key_type_t get_type(private_openssl_rsa_private_key_t *this)
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{
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return KEY_RSA;
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}
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/**
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* Implementation of openssl_rsa_private_key.destroy.
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*/
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static bool sign(private_openssl_rsa_private_key_t *this, signature_scheme_t scheme,
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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_DEFAULT:
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/* default is EMSA-PKCS1 using SHA1 */
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case SIGN_RSA_EMSA_PKCS1_SHA1:
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return build_emsa_pkcs1_signature(this, NID_sha1, data, signature);
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case SIGN_RSA_EMSA_PKCS1_SHA256:
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return build_emsa_pkcs1_signature(this, NID_sha256, data, signature);
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case SIGN_RSA_EMSA_PKCS1_SHA384:
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return build_emsa_pkcs1_signature(this, NID_sha384, data, signature);
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case SIGN_RSA_EMSA_PKCS1_SHA512:
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return build_emsa_pkcs1_signature(this, NID_sha512, data, signature);
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case SIGN_RSA_EMSA_PKCS1_MD5:
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return build_emsa_pkcs1_signature(this, NID_md5, data, signature);
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default:
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DBG1("signature scheme %N not supported in RSA",
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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 openssl_rsa_private_key.destroy.
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*/
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static bool decrypt(private_openssl_rsa_private_key_t *this,
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chunk_t crypto, chunk_t *plain)
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{
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DBG1("RSA 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 openssl_rsa_private_key.destroy.
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*/
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static size_t get_keysize(private_openssl_rsa_private_key_t *this)
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{
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return RSA_size(this->rsa);
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}
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/**
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* Implementation of openssl_rsa_private_key.destroy.
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*/
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static identification_t* get_id(private_openssl_rsa_private_key_t *this,
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id_type_t type)
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{
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switch (type)
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{
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case ID_PUBKEY_INFO_SHA1:
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return this->keyid_info;
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case ID_PUBKEY_SHA1:
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return this->keyid;
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default:
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return NULL;
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}
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}
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/**
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* Implementation of openssl_rsa_private_key.destroy.
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*/
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static openssl_rsa_public_key_t* get_public_key(private_openssl_rsa_private_key_t *this)
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{
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return openssl_rsa_public_key_create_from_n_e(this->rsa->n, this->rsa->e);
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}
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/**
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* Implementation of openssl_rsa_private_key.destroy.
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*/
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static bool belongs_to(private_openssl_rsa_private_key_t *this, public_key_t *public)
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{
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identification_t *keyid;
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if (public->get_type(public) != KEY_RSA)
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{
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return FALSE;
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}
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keyid = public->get_id(public, ID_PUBKEY_SHA1);
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if (keyid && keyid->equals(keyid, this->keyid))
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{
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return TRUE;
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}
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keyid = public->get_id(public, ID_PUBKEY_INFO_SHA1);
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if (keyid && keyid->equals(keyid, this->keyid_info))
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{
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return TRUE;
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}
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return FALSE;
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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 chunk_t get_encoding(private_openssl_rsa_private_key_t *this)
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{
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chunk_t enc = chunk_alloc(i2d_RSAPrivateKey(this->rsa, NULL));
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u_char *p = enc.ptr;
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i2d_RSAPrivateKey(this->rsa, &p);
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return enc;
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}
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/**
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* Implementation of openssl_rsa_private_key.destroy.
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*/
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static private_openssl_rsa_private_key_t* get_ref(private_openssl_rsa_private_key_t *this)
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{
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ref_get(&this->ref);
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return this;
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}
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/**
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* Implementation of openssl_rsa_private_key.destroy.
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*/
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static void destroy(private_openssl_rsa_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->rsa)
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{
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RSA_free(this->rsa);
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}
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DESTROY_IF(this->keyid);
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DESTROY_IF(this->keyid_info);
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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_rsa_private_key_t *openssl_rsa_private_key_create_empty(void)
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{
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private_openssl_rsa_private_key_t *this = malloc_thing(private_openssl_rsa_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_id = (identification_t* (*) (private_key_t *this,id_type_t))get_id;
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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.belongs_to = (bool (*) (private_key_t *this, public_key_t *public))belongs_to;
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this->public.interface.get_encoding = (chunk_t(*)(private_key_t*))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->keyid = NULL;
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this->keyid_info = 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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* Generate an RSA key of specified key size
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*/
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static openssl_rsa_private_key_t *generate(size_t key_size)
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{
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private_openssl_rsa_private_key_t *this = openssl_rsa_private_key_create_empty();
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this->rsa = RSA_generate_key(key_size, PUBLIC_EXPONENT, NULL, NULL);
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if (!openssl_rsa_public_key_build_id(this->rsa, &this->keyid, &this->keyid_info))
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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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/**
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* load private key from an ASN1 encoded blob
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*/
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static openssl_rsa_private_key_t *load(chunk_t blob)
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{
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u_char *p = blob.ptr;
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private_openssl_rsa_private_key_t *this = openssl_rsa_private_key_create_empty();
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this->rsa = d2i_RSAPrivateKey(NULL, (const u_char**)&p, blob.len);
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chunk_clear(&blob);
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if (!this->rsa)
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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 (!openssl_rsa_public_key_build_id(this->rsa, &this->keyid, &this->keyid_info))
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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 (!RSA_check_key(this->rsa))
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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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typedef struct private_builder_t private_builder_t;
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/**
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* Builder implementation for key loading/generation
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*/
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struct private_builder_t {
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/** implements the builder interface */
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builder_t public;
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/** loaded/generated private key */
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openssl_rsa_private_key_t *key;
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};
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/**
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* Implementation of builder_t.build
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*/
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static openssl_rsa_private_key_t *build(private_builder_t *this)
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{
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openssl_rsa_private_key_t *key = this->key;
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free(this);
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return key;
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}
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/**
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* Implementation of builder_t.add
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*/
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static void add(private_builder_t *this, builder_part_t part, ...)
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{
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va_list args;
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if (this->key)
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{
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DBG1("ignoring surplus build part %N", builder_part_names, part);
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return;
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}
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switch (part)
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{
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case BUILD_BLOB_ASN1_DER:
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{
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va_start(args, part);
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this->key = load(va_arg(args, chunk_t));
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va_end(args);
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break;
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}
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case BUILD_KEY_SIZE:
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{
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va_start(args, part);
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this->key = generate(va_arg(args, u_int));
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va_end(args);
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break;
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}
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default:
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DBG1("ignoring unsupported build part %N", builder_part_names, part);
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break;
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}
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}
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/**
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* Builder construction function
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*/
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builder_t *openssl_rsa_private_key_builder(key_type_t type)
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{
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private_builder_t *this;
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if (type != KEY_RSA)
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{
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return NULL;
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}
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this = malloc_thing(private_builder_t);
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this->key = NULL;
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this->public.add = (void(*)(builder_t *this, builder_part_t part, ...))add;
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this->public.build = (void*(*)(builder_t *this))build;
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return &this->public;
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}
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@ -0,0 +1,47 @@
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/*
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* Copyright (C) 2008 Tobias Brunner
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* Hochschule fuer Technik Rapperswil
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||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation; either version 2 of the License, or (at your
|
||||
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||||
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* for more details.
|
||||
*/
|
||||
|
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/**
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* @defgroup openssl_rsa_private_key openssl_rsa_private_key
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* @{ @ingroup openssl_p
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*/
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#ifndef OPENSSL_RSA_PRIVATE_KEY_H_
|
||||
#define OPENSSL_RSA_PRIVATE_KEY_H_
|
||||
|
||||
#include <credentials/keys/private_key.h>
|
||||
|
||||
typedef struct openssl_rsa_private_key_t openssl_rsa_private_key_t;
|
||||
|
||||
/**
|
||||
* private_key_t implementation of RSA algorithm using OpenSSL.
|
||||
*/
|
||||
struct openssl_rsa_private_key_t {
|
||||
|
||||
/**
|
||||
* Implements private_key_t interface
|
||||
*/
|
||||
private_key_t interface;
|
||||
};
|
||||
|
||||
/**
|
||||
* Create the builder for a private key.
|
||||
*
|
||||
* @param type type of the key, must be KEY_RSA
|
||||
* @return builder instance
|
||||
*/
|
||||
builder_t *openssl_rsa_private_key_builder(key_type_t type);
|
||||
|
||||
#endif /*OPENSSL_RSA_PRIVATE_KEY_H_ @}*/
|
||||
|
|
@ -0,0 +1,433 @@
|
|||
/*
|
||||
* Copyright (C) 2008 Tobias Brunner
|
||||
* Hochschule fuer Technik Rapperswil
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation; either version 2 of the License, or (at your
|
||||
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||||
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* for more details.
|
||||
*
|
||||
* $Id$
|
||||
*/
|
||||
|
||||
#include "openssl_rsa_public_key.h"
|
||||
|
||||
#include <debug.h>
|
||||
|
||||
#include <openssl/evp.h>
|
||||
#include <openssl/rsa.h>
|
||||
#include <openssl/x509.h>
|
||||
|
||||
typedef struct private_openssl_rsa_public_key_t private_openssl_rsa_public_key_t;
|
||||
|
||||
/**
|
||||
* Private data structure with signing context.
|
||||
*/
|
||||
struct private_openssl_rsa_public_key_t {
|
||||
/**
|
||||
* Public interface for this signer.
|
||||
*/
|
||||
openssl_rsa_public_key_t public;
|
||||
|
||||
/**
|
||||
* RSA object from OpenSSL
|
||||
*/
|
||||
RSA *rsa;
|
||||
|
||||
/**
|
||||
* Keyid formed as a SHA-1 hash of a publicKeyInfo object
|
||||
*/
|
||||
identification_t *keyid_info;
|
||||
|
||||
/**
|
||||
* Keyid formed as a SHA-1 hash of a publicKey object
|
||||
*/
|
||||
identification_t *keyid;
|
||||
|
||||
/**
|
||||
* reference counter
|
||||
*/
|
||||
refcount_t ref;
|
||||
};
|
||||
|
||||
/**
|
||||
* Verification of an EMPSA PKCS1 signature described in PKCS#1
|
||||
*/
|
||||
static bool verify_emsa_pkcs1_signature(private_openssl_rsa_public_key_t *this,
|
||||
int type, chunk_t data, chunk_t signature)
|
||||
{
|
||||
bool valid = FALSE;
|
||||
const EVP_MD *hasher = EVP_get_digestbynid(type);
|
||||
if (!hasher)
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
EVP_MD_CTX *ctx = EVP_MD_CTX_create();
|
||||
EVP_PKEY *key = EVP_PKEY_new();
|
||||
if (!ctx || !key)
|
||||
{
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (!EVP_PKEY_set1_RSA(key, this->rsa))
|
||||
{
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (!EVP_VerifyInit_ex(ctx, hasher, NULL))
|
||||
{
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (!EVP_VerifyUpdate(ctx, data.ptr, data.len))
|
||||
{
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* remove any preceding 0-bytes from signature */
|
||||
while (signature.len && *(signature.ptr) == 0x00)
|
||||
{
|
||||
signature.len -= 1;
|
||||
signature.ptr++;
|
||||
}
|
||||
|
||||
valid = (EVP_VerifyFinal(ctx, signature.ptr, signature.len, key) == 1);
|
||||
|
||||
error:
|
||||
if (key)
|
||||
{
|
||||
EVP_PKEY_free(key);
|
||||
}
|
||||
if (ctx)
|
||||
{
|
||||
EVP_MD_CTX_destroy(ctx);
|
||||
}
|
||||
return valid;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of public_key_t.get_type.
|
||||
*/
|
||||
static key_type_t get_type(private_openssl_rsa_public_key_t *this)
|
||||
{
|
||||
return KEY_RSA;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of public_key_t.verify.
|
||||
*/
|
||||
static bool verify(private_openssl_rsa_public_key_t *this, signature_scheme_t scheme,
|
||||
chunk_t data, chunk_t signature)
|
||||
{
|
||||
switch (scheme)
|
||||
{
|
||||
case SIGN_DEFAULT:
|
||||
/* default is EMSA-PKCS1 using SHA1 */
|
||||
case SIGN_RSA_EMSA_PKCS1_SHA1:
|
||||
return verify_emsa_pkcs1_signature(this, NID_sha1, data, signature);
|
||||
case SIGN_RSA_EMSA_PKCS1_SHA256:
|
||||
return verify_emsa_pkcs1_signature(this, NID_sha256, data, signature);
|
||||
case SIGN_RSA_EMSA_PKCS1_SHA384:
|
||||
return verify_emsa_pkcs1_signature(this, NID_sha384, data, signature);
|
||||
case SIGN_RSA_EMSA_PKCS1_SHA512:
|
||||
return verify_emsa_pkcs1_signature(this, NID_sha512, data, signature);
|
||||
case SIGN_RSA_EMSA_PKCS1_MD5:
|
||||
return verify_emsa_pkcs1_signature(this, NID_md5, data, signature);
|
||||
default:
|
||||
DBG1("signature scheme %N not supported in RSA",
|
||||
signature_scheme_names, scheme);
|
||||
return FALSE;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of public_key_t.get_keysize.
|
||||
*/
|
||||
static bool encrypt(private_openssl_rsa_public_key_t *this, chunk_t crypto, chunk_t *plain)
|
||||
{
|
||||
DBG1("RSA public key encryption not implemented");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of public_key_t.get_keysize.
|
||||
*/
|
||||
static size_t get_keysize(private_openssl_rsa_public_key_t *this)
|
||||
{
|
||||
return RSA_size(this->rsa);
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of public_key_t.get_id.
|
||||
*/
|
||||
static identification_t *get_id(private_openssl_rsa_public_key_t *this,
|
||||
id_type_t type)
|
||||
{
|
||||
switch (type)
|
||||
{
|
||||
case ID_PUBKEY_INFO_SHA1:
|
||||
return this->keyid_info;
|
||||
case ID_PUBKEY_SHA1:
|
||||
return this->keyid;
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Encodes the public key
|
||||
*/
|
||||
static chunk_t get_encoding_raw(RSA *rsa)
|
||||
{
|
||||
chunk_t enc = chunk_alloc(i2d_RSAPublicKey(rsa, NULL));
|
||||
u_char *p = enc.ptr;
|
||||
i2d_RSAPublicKey(rsa, &p);
|
||||
return enc;
|
||||
}
|
||||
|
||||
/**
|
||||
* Encodes the public key with the algorithm used
|
||||
*/
|
||||
static chunk_t get_encoding_with_algo(RSA *rsa)
|
||||
{
|
||||
u_char *p;
|
||||
chunk_t enc;
|
||||
X509_PUBKEY *pubkey = X509_PUBKEY_new();
|
||||
|
||||
ASN1_OBJECT_free(pubkey->algor->algorithm);
|
||||
pubkey->algor->algorithm = OBJ_nid2obj(NID_rsaEncryption);
|
||||
|
||||
if (pubkey->algor->parameter == NULL ||
|
||||
pubkey->algor->parameter->type != V_ASN1_NULL)
|
||||
{
|
||||
ASN1_TYPE_free(pubkey->algor->parameter);
|
||||
pubkey->algor->parameter = ASN1_TYPE_new();
|
||||
pubkey->algor->parameter->type = V_ASN1_NULL;
|
||||
}
|
||||
|
||||
enc = get_encoding_raw(rsa);
|
||||
M_ASN1_BIT_STRING_set(pubkey->public_key, enc.ptr, enc.len);
|
||||
chunk_free(&enc);
|
||||
|
||||
enc = chunk_alloc(i2d_X509_PUBKEY(pubkey, NULL));
|
||||
p = enc.ptr;
|
||||
i2d_X509_PUBKEY(pubkey, &p);
|
||||
X509_PUBKEY_free(pubkey);
|
||||
return enc;
|
||||
}
|
||||
|
||||
/*
|
||||
* Implementation of public_key_t.get_encoding.
|
||||
*/
|
||||
static chunk_t get_encoding(private_openssl_rsa_public_key_t *this)
|
||||
{
|
||||
return get_encoding_raw(this->rsa);
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of public_key_t.get_ref.
|
||||
*/
|
||||
static private_openssl_rsa_public_key_t* get_ref(private_openssl_rsa_public_key_t *this)
|
||||
{
|
||||
ref_get(&this->ref);
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of openssl_rsa_public_key.destroy.
|
||||
*/
|
||||
static void destroy(private_openssl_rsa_public_key_t *this)
|
||||
{
|
||||
if (ref_put(&this->ref))
|
||||
{
|
||||
if (this->rsa)
|
||||
{
|
||||
RSA_free(this->rsa);
|
||||
}
|
||||
DESTROY_IF(this->keyid);
|
||||
DESTROY_IF(this->keyid_info);
|
||||
free(this);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Generic private constructor
|
||||
*/
|
||||
static private_openssl_rsa_public_key_t *openssl_rsa_public_key_create_empty()
|
||||
{
|
||||
private_openssl_rsa_public_key_t *this = malloc_thing(private_openssl_rsa_public_key_t);
|
||||
|
||||
this->public.interface.get_type = (key_type_t (*)(public_key_t *this))get_type;
|
||||
this->public.interface.verify = (bool (*)(public_key_t *this, signature_scheme_t scheme, chunk_t data, chunk_t signature))verify;
|
||||
this->public.interface.encrypt = (bool (*)(public_key_t *this, chunk_t crypto, chunk_t *plain))encrypt;
|
||||
this->public.interface.get_keysize = (size_t (*) (public_key_t *this))get_keysize;
|
||||
this->public.interface.get_id = (identification_t* (*) (public_key_t *this,id_type_t))get_id;
|
||||
this->public.interface.get_encoding = (chunk_t(*)(public_key_t*))get_encoding;
|
||||
this->public.interface.get_ref = (public_key_t* (*)(public_key_t *this))get_ref;
|
||||
this->public.interface.destroy = (void (*)(public_key_t *this))destroy;
|
||||
|
||||
this->keyid = NULL;
|
||||
this->keyid_info = NULL;
|
||||
this->ref = 1;
|
||||
|
||||
return this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Build the RSA key identifier from n and e using SHA1 hashed publicKey(Info).
|
||||
* Also used in openssl_rsa_private_key.c.
|
||||
*/
|
||||
bool openssl_rsa_public_key_build_id(RSA *rsa, identification_t **keyid,
|
||||
identification_t **keyid_info)
|
||||
{
|
||||
chunk_t publicKeyInfo, publicKey, hash;
|
||||
hasher_t *hasher;
|
||||
|
||||
hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
|
||||
if (hasher == NULL)
|
||||
{
|
||||
DBG1("SHA1 hash algorithm not supported, unable to use RSA");
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
publicKey = get_encoding_raw(rsa);
|
||||
|
||||
hasher->allocate_hash(hasher, publicKey, &hash);
|
||||
*keyid = identification_create_from_encoding(ID_PUBKEY_SHA1, hash);
|
||||
chunk_free(&hash);
|
||||
|
||||
publicKeyInfo = get_encoding_with_algo(rsa);
|
||||
|
||||
hasher->allocate_hash(hasher, publicKeyInfo, &hash);
|
||||
*keyid_info = identification_create_from_encoding(ID_PUBKEY_INFO_SHA1, hash);
|
||||
chunk_free(&hash);
|
||||
|
||||
hasher->destroy(hasher);
|
||||
chunk_free(&publicKeyInfo);
|
||||
chunk_free(&publicKey);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
/**
|
||||
* Create a public key from BIGNUM values, used in openssl_rsa_private_key.c
|
||||
*/
|
||||
openssl_rsa_public_key_t *openssl_rsa_public_key_create_from_n_e(BIGNUM *n, BIGNUM *e)
|
||||
{
|
||||
private_openssl_rsa_public_key_t *this = openssl_rsa_public_key_create_empty();
|
||||
|
||||
this->rsa = RSA_new();
|
||||
this->rsa->n = BN_dup(n);
|
||||
this->rsa->e = BN_dup(e);
|
||||
|
||||
if (!openssl_rsa_public_key_build_id(this->rsa, &this->keyid, &this->keyid_info))
|
||||
{
|
||||
destroy(this);
|
||||
return NULL;
|
||||
}
|
||||
return &this->public;
|
||||
}
|
||||
|
||||
/**
|
||||
* Load a public key from an ASN1 encoded blob
|
||||
*/
|
||||
static openssl_rsa_public_key_t *load(chunk_t blob)
|
||||
{
|
||||
u_char *p = blob.ptr;
|
||||
private_openssl_rsa_public_key_t *this = openssl_rsa_public_key_create_empty();
|
||||
|
||||
this->rsa = d2i_RSAPublicKey(NULL, (const u_char**)&p, blob.len);
|
||||
|
||||
chunk_clear(&blob);
|
||||
|
||||
if (!this->rsa)
|
||||
{
|
||||
destroy(this);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (!openssl_rsa_public_key_build_id(this->rsa, &this->keyid, &this->keyid_info))
|
||||
{
|
||||
destroy(this);
|
||||
return NULL;
|
||||
}
|
||||
return &this->public;
|
||||
}
|
||||
|
||||
typedef struct private_builder_t private_builder_t;
|
||||
/**
|
||||
* Builder implementation for key loading
|
||||
*/
|
||||
struct private_builder_t {
|
||||
/** implements the builder interface */
|
||||
builder_t public;
|
||||
/** loaded public key */
|
||||
openssl_rsa_public_key_t *key;
|
||||
};
|
||||
|
||||
/**
|
||||
* Implementation of builder_t.build
|
||||
*/
|
||||
static openssl_rsa_public_key_t *build(private_builder_t *this)
|
||||
{
|
||||
openssl_rsa_public_key_t *key = this->key;
|
||||
|
||||
free(this);
|
||||
return key;
|
||||
}
|
||||
|
||||
/**
|
||||
* Implementation of builder_t.add
|
||||
*/
|
||||
static void add(private_builder_t *this, builder_part_t part, ...)
|
||||
{
|
||||
va_list args;
|
||||
|
||||
if (this->key)
|
||||
{
|
||||
DBG1("ignoring surplus build part %N", builder_part_names, part);
|
||||
return;
|
||||
}
|
||||
|
||||
switch (part)
|
||||
{
|
||||
case BUILD_BLOB_ASN1_DER:
|
||||
{
|
||||
va_start(args, part);
|
||||
this->key = load(va_arg(args, chunk_t));
|
||||
va_end(args);
|
||||
break;
|
||||
}
|
||||
default:
|
||||
DBG1("ignoring unsupported build part %N", builder_part_names, part);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Builder construction function
|
||||
*/
|
||||
builder_t *openssl_rsa_public_key_builder(key_type_t type)
|
||||
{
|
||||
private_builder_t *this;
|
||||
|
||||
if (type != KEY_RSA)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
this = malloc_thing(private_builder_t);
|
||||
|
||||
this->key = NULL;
|
||||
this->public.add = (void(*)(builder_t *this, builder_part_t part, ...))add;
|
||||
this->public.build = (void*(*)(builder_t *this))build;
|
||||
|
||||
return &this->public;
|
||||
}
|
||||
|
||||
|
|
@ -0,0 +1,49 @@
|
|||
/*
|
||||
* Copyright (C) 2008 Tobias Brunner
|
||||
* Hochschule fuer Technik Rapperswil
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation; either version 2 of the License, or (at your
|
||||
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||||
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* for more details.
|
||||
*
|
||||
* $Id$
|
||||
*/
|
||||
|
||||
/**
|
||||
* @defgroup openssl_rsa_public_key openssl_rsa_public_key
|
||||
* @{ @ingroup openssl_p
|
||||
*/
|
||||
|
||||
#ifndef OPENSSL_RSA_PUBLIC_KEY_H_
|
||||
#define OPENSSL_RSA_PUBLIC_KEY_H_
|
||||
|
||||
typedef struct openssl_rsa_public_key_t openssl_rsa_public_key_t;
|
||||
|
||||
#include <credentials/keys/public_key.h>
|
||||
|
||||
/**
|
||||
* public_key_t implementation of RSA algorithm using libgmp.
|
||||
*/
|
||||
struct openssl_rsa_public_key_t {
|
||||
|
||||
/**
|
||||
* Implements the public_key_t interface
|
||||
*/
|
||||
public_key_t interface;
|
||||
};
|
||||
|
||||
/**
|
||||
* Create the builder for a public key.
|
||||
*
|
||||
* @param type type of the key, must be KEY_RSA
|
||||
* @return builder instance
|
||||
*/
|
||||
builder_t *openssl_rsa_public_key_builder(key_type_t type);
|
||||
|
||||
#endif /*OPENSSL_RSA_PUBLIC_KEY_H_ @}*/
|
||||
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Reference in New Issue