gcrypt RSA public key implementation
This commit is contained in:
Martin Willi
parent
ff8d3ba355
commit
3240cab978
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@ -6,6 +6,7 @@ AM_CFLAGS = -rdynamic $(LIBGCRYPT_CFLAGS)
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plugin_LTLIBRARIES = libstrongswan-gcrypt.la
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libstrongswan_gcrypt_la_SOURCES = gcrypt_plugin.h gcrypt_plugin.c \
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gcrypt_rsa_public_key.h gcrypt_rsa_public_key.c \
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gcrypt_rsa_private_key.h gcrypt_rsa_private_key.c \
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gcrypt_dh.h gcrypt_dh.c \
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gcrypt_rng.h gcrypt_rng.c \
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@ -20,6 +20,7 @@
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#include "gcrypt_rng.h"
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#include "gcrypt_dh.h"
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#include "gcrypt_rsa_private_key.h"
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#include "gcrypt_rsa_public_key.h"
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#include <library.h>
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#include <debug.h>
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@ -107,6 +108,8 @@ static void destroy(private_gcrypt_plugin_t *this)
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(dh_constructor_t)gcrypt_dh_create);
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lib->creds->remove_builder(lib->creds,
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(builder_constructor_t)gcrypt_rsa_private_key_builder);
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lib->creds->remove_builder(lib->creds,
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(builder_constructor_t)gcrypt_rsa_public_key_builder);
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free(this);
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}
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@ -200,6 +203,8 @@ plugin_t *plugin_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)gcrypt_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)gcrypt_rsa_public_key_builder);
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return &this->public.plugin;
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}
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@ -55,10 +55,15 @@ struct private_gcrypt_rsa_private_key_t {
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refcount_t ref;
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};
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/**
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* Implemented in gcrypt_rsa_public_key.c
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*/
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public_key_t *gcrypt_rsa_public_key_create_from_sexp(gcry_sexp_t key);
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/**
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* find a token in a S-expression
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*/
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static chunk_t gcrypt_rsa_find_token(gcry_sexp_t sexp, char *name)
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chunk_t gcrypt_rsa_find_token(gcry_sexp_t sexp, char *name)
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{
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gcry_sexp_t token;
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chunk_t data = chunk_empty;
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@ -198,7 +203,7 @@ static identification_t* get_id(private_gcrypt_rsa_private_key_t *this,
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*/
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static public_key_t* get_public_key(private_gcrypt_rsa_private_key_t *this)
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{
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return NULL;
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return gcrypt_rsa_public_key_create_from_sexp(this->key);
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}
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/**
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@ -375,8 +380,8 @@ static private_gcrypt_rsa_private_key_t *gcrypt_rsa_private_key_create_empty()
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/**
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* build the keyids of a private/public key
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*/
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static bool gcrypt_rsa_build_keyids(gcry_sexp_t key, identification_t **keyid,
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identification_t **keyid_info)
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bool gcrypt_rsa_build_keyids(gcry_sexp_t key, identification_t **keyid,
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identification_t **keyid_info)
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{
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chunk_t publicKeyInfo, publicKey, hash;
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hasher_t *hasher;
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@ -0,0 +1,436 @@
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/*
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* Copyright (C) 2005-2009 Martin Willi
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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 <gcrypt.h>
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#include "gcrypt_rsa_public_key.h"
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#include <debug.h>
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#include <asn1/oid.h>
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#include <asn1/asn1.h>
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#include <asn1/asn1_parser.h>
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#include <asn1/pem.h>
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#include <crypto/hashers/hasher.h>
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typedef struct private_gcrypt_rsa_public_key_t private_gcrypt_rsa_public_key_t;
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/**
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* Private data structure with signing context.
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*/
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struct private_gcrypt_rsa_public_key_t {
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/**
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* Public interface for this signer.
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*/
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gcrypt_rsa_public_key_t public;
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/**
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* gcrypt S-expression representing an public RSA key
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*/
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gcry_sexp_t key;
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/**
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* Keyid formed as a SHA-1 hash of a publicKey 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 publicKeyInfo object
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*/
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identification_t* keyid_info;
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/**
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* reference counter
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*/
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refcount_t ref;
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};
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/**
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* Implemented in gcrypt_rsa_private_key.c
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*/
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chunk_t gcrypt_rsa_find_token(gcry_sexp_t sexp, char *name);
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bool gcrypt_rsa_build_keyids(gcry_sexp_t key, identification_t **keyid,
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identification_t **keyid_info);
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/**
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* Verification of an EMPSA PKCS1 signature described in PKCS#1
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*/
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static bool verify_pkcs1(private_gcrypt_rsa_public_key_t *this,
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hash_algorithm_t algorithm, char *hash_name,
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chunk_t data, chunk_t signature)
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{
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hasher_t *hasher;
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chunk_t hash;
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gcry_error_t err;
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gcry_sexp_t in, sig;
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hasher = lib->crypto->create_hasher(lib->crypto, algorithm);
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if (!hasher)
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{
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return FALSE;
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}
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hasher->allocate_hash(hasher, data, &hash);
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hasher->destroy(hasher);
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err = gcry_sexp_build(&in, NULL, "(data(flags pkcs1)(hash %s %b))",
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hash_name, hash.len, hash.ptr);
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chunk_free(&hash);
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if (err)
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{
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DBG1("building data S-expression failed: %s", gpg_strerror(err));
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return FALSE;
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}
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err = gcry_sexp_build(&sig, NULL, "(sig-val(rsa(s %b)))",
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signature.len, signature.ptr);
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if (err)
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{
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DBG1("building signature S-expression failed: %s", gpg_strerror(err));
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gcry_sexp_release(in);
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return FALSE;
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}
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err = gcry_pk_verify(sig, in, this->key);
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gcry_sexp_release(in);
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gcry_sexp_release(sig);
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if (err)
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{
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DBG1("RSA signature verification failed: %s", gpg_strerror(err));
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return FALSE;
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}
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return TRUE;
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}
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/**
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* Implementation of public_key_t.get_type.
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*/
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static key_type_t get_type(private_gcrypt_rsa_public_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 public_key_t.verify.
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*/
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static bool verify(private_gcrypt_rsa_public_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_RSA_EMSA_PKCS1_MD5:
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return verify_pkcs1(this, HASH_MD5, "md5", data, signature);
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case SIGN_RSA_EMSA_PKCS1_SHA1:
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return verify_pkcs1(this, HASH_SHA1, "sha1", data, signature);
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case SIGN_RSA_EMSA_PKCS1_SHA256:
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return verify_pkcs1(this, HASH_SHA256, "sha256", data, signature);
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case SIGN_RSA_EMSA_PKCS1_SHA384:
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return verify_pkcs1(this, HASH_SHA384, "sha384", data, signature);
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case SIGN_RSA_EMSA_PKCS1_SHA512:
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return verify_pkcs1(this, HASH_SHA512, "sha512", data, signature);
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case SIGN_DEFAULT:
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/* parsing hash OID currently not supported by gcrypt, fall */
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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 public_key_t.get_keysize.
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*/
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static bool encrypt_(private_gcrypt_rsa_public_key_t *this, chunk_t crypto,
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chunk_t *plain)
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{
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DBG1("RSA public key encryption not implemented");
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return FALSE;
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}
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/**
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* Implementation of gcrypt_rsa_public_key.equals.
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*/
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static bool equals(private_gcrypt_rsa_public_key_t *this, public_key_t *other)
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{
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identification_t *keyid;
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if (&this->public.interface == other)
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{
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return TRUE;
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}
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if (other->get_type(other) != KEY_RSA)
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{
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return FALSE;
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}
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keyid = other->get_id(other, 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 = other->get_id(other, 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 public_key_t.get_keysize.
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*/
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static size_t get_keysize(private_gcrypt_rsa_public_key_t *this)
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{
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return gcry_pk_get_nbits(this->key) / 8;
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}
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/**
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* Implementation of public_key_t.get_id.
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*/
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static identification_t *get_id(private_gcrypt_rsa_public_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 public_key_t.get_encoding.
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*/
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static chunk_t get_encoding(private_gcrypt_rsa_public_key_t *this)
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{
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return asn1_wrap(ASN1_SEQUENCE, "mm",
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asn1_wrap(ASN1_INTEGER, "m", gcrypt_rsa_find_token(this->key, "n")),
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asn1_wrap(ASN1_INTEGER, "m", gcrypt_rsa_find_token(this->key, "e")));
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}
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/**
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* Implementation of public_key_t.get_ref.
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*/
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static public_key_t* get_ref(private_gcrypt_rsa_public_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 gcrypt_rsa_public_key.destroy.
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*/
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static void destroy(private_gcrypt_rsa_public_key_t *this)
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{
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if (ref_put(&this->ref))
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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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gcry_sexp_release(this->key);
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free(this);
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}
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}
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/**
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* Generic private constructor
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*/
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static private_gcrypt_rsa_public_key_t *gcrypt_rsa_public_key_create_empty()
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{
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private_gcrypt_rsa_public_key_t *this = malloc_thing(private_gcrypt_rsa_public_key_t);
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this->public.interface.get_type = (key_type_t (*)(public_key_t *this))get_type;
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this->public.interface.verify = (bool (*)(public_key_t *this, signature_scheme_t scheme, chunk_t data, chunk_t signature))verify;
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this->public.interface.encrypt = (bool (*)(public_key_t *this, chunk_t crypto, chunk_t *plain))encrypt_;
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this->public.interface.equals = (bool (*) (public_key_t*, public_key_t*))equals;
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this->public.interface.get_keysize = (size_t (*) (public_key_t *this))get_keysize;
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this->public.interface.get_id = (identification_t* (*) (public_key_t *this,id_type_t))get_id;
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this->public.interface.get_encoding = (chunk_t(*)(public_key_t*))get_encoding;
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this->public.interface.get_ref = (public_key_t* (*)(public_key_t *this))get_ref;
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this->public.interface.destroy = (void (*)(public_key_t *this))destroy;
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this->key = NULL;
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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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* Create a public key from a S-expression, used in gcrypt_rsa_private_key
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*/
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public_key_t *gcrypt_rsa_public_key_create_from_sexp(gcry_sexp_t key)
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{
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private_gcrypt_rsa_public_key_t *this;
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gcry_error_t err;
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chunk_t n, e;
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this = gcrypt_rsa_public_key_create_empty();
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n = gcrypt_rsa_find_token(key, "n");
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e = gcrypt_rsa_find_token(key, "e");
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err = gcry_sexp_build(&this->key, NULL, "(public-key(rsa(n %b)(e %b)))",
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n.len, n.ptr, e.len, e.ptr);
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chunk_free(&n);
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chunk_free(&e);
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if (err)
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{
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DBG1("loading public key failed: %s", gpg_strerror(err));
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free(this);
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return NULL;
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}
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if (!gcrypt_rsa_build_keyids(this->key, &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.interface;
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}
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/**
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* ASN.1 definition of RSApublicKey
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*/
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static const asn1Object_t pubkeyObjects[] = {
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{ 0, "RSAPublicKey", ASN1_SEQUENCE, ASN1_OBJ }, /* 0 */
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{ 1, "modulus", ASN1_INTEGER, ASN1_BODY }, /* 1 */
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{ 1, "publicExponent", ASN1_INTEGER, ASN1_BODY }, /* 2 */
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{ 0, "exit", ASN1_EOC, ASN1_EXIT }
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};
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#define PUB_KEY_RSA_PUBLIC_KEY 0
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#define PUB_KEY_MODULUS 1
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#define PUB_KEY_EXPONENT 2
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/**
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* Load a public key from an ASN1 encoded blob
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*/
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static gcrypt_rsa_public_key_t *load(chunk_t blob)
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{
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private_gcrypt_rsa_public_key_t *this;
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asn1_parser_t *parser;
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chunk_t object, n, e;
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int objectID;
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bool success = FALSE;
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gcry_error_t err;
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parser = asn1_parser_create(pubkeyObjects, blob);
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while (parser->iterate(parser, &objectID, &object))
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{
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switch (objectID)
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{
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case PUB_KEY_MODULUS:
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n = object;
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break;
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case PUB_KEY_EXPONENT:
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e = object;
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break;
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}
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}
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success = parser->success(parser);
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parser->destroy(parser);
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if (!success)
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{
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return NULL;
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}
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this = gcrypt_rsa_public_key_create_empty();
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err = gcry_sexp_build(&this->key, NULL, "(public-key(rsa(n %b)(e %b)))",
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n.len, n.ptr, e.len, e.ptr);
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if (err)
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{
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DBG1("loading public key failed: %s", gpg_strerror(err));
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free(this);
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return NULL;
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}
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if (!gcrypt_rsa_build_keyids(this->key, &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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typedef struct private_builder_t private_builder_t;
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/**
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* Builder implementation for key loading
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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 public key */
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gcrypt_rsa_public_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 gcrypt_rsa_public_key_t *build(private_builder_t *this)
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{
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gcrypt_rsa_public_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
|
||||
*/
|
||||
static void add(private_builder_t *this, builder_part_t part, ...)
|
||||
{
|
||||
if (!this->key)
|
||||
{
|
||||
va_list args;
|
||||
|
||||
switch (part)
|
||||
{
|
||||
case BUILD_BLOB_ASN1_DER:
|
||||
{
|
||||
va_start(args, part);
|
||||
this->key = load(va_arg(args, chunk_t));
|
||||
va_end(args);
|
||||
return;
|
||||
}
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (this->key)
|
||||
{
|
||||
destroy((private_gcrypt_rsa_public_key_t*)this->key);
|
||||
}
|
||||
builder_cancel(&this->public);
|
||||
}
|
||||
|
||||
/**
|
||||
* Builder construction function
|
||||
*/
|
||||
builder_t *gcrypt_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 +1,47 @@
|
|||
/*
|
||||
* Copyright (C) 2009 Martin Willi
|
||||
* 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.
|
||||
*/
|
||||
|
||||
/**
|
||||
* @defgroup gcrypt_rsa_public_key gcrypt_rsa_public_key
|
||||
* @{ @ingroup gcrypt_p
|
||||
*/
|
||||
|
||||
#ifndef GCRYPT_RSA_PUBLIC_KEY_H_
|
||||
#define GCRYPT_RSA_PUBLIC_KEY_H_
|
||||
|
||||
typedef struct gcrypt_rsa_public_key_t gcrypt_rsa_public_key_t;
|
||||
|
||||
#include <credentials/keys/public_key.h>
|
||||
|
||||
/**
|
||||
* public_key_t implementation of RSA algorithm using libgcrypt.
|
||||
*/
|
||||
struct gcrypt_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 *gcrypt_rsa_public_key_builder(key_type_t type);
|
||||
|
||||
#endif /** GCRYPT_RSA_PUBLIC_KEY_H_ @}*/
|
||||
Loading…
Reference in New Issue