353 lines
8.0 KiB
C
353 lines
8.0 KiB
C
/*
|
|
* Copyright (C) 2009 Martin Willi
|
|
* 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.
|
|
*/
|
|
|
|
#include <openssl/opensslconf.h>
|
|
|
|
#ifndef OPENSSL_NO_EC
|
|
|
|
#include "openssl_ec_public_key.h"
|
|
#include "openssl_util.h"
|
|
|
|
#include <debug.h>
|
|
|
|
#include <openssl/evp.h>
|
|
#include <openssl/ecdsa.h>
|
|
#include <openssl/x509.h>
|
|
|
|
typedef struct private_openssl_ec_public_key_t private_openssl_ec_public_key_t;
|
|
|
|
/**
|
|
* Private data structure with signing context.
|
|
*/
|
|
struct private_openssl_ec_public_key_t {
|
|
/**
|
|
* Public interface for this signer.
|
|
*/
|
|
openssl_ec_public_key_t public;
|
|
|
|
/**
|
|
* EC key object
|
|
*/
|
|
EC_KEY *ec;
|
|
|
|
/**
|
|
* reference counter
|
|
*/
|
|
refcount_t ref;
|
|
};
|
|
|
|
/**
|
|
* Verification of a signature as in RFC 4754
|
|
*/
|
|
static bool verify_signature(private_openssl_ec_public_key_t *this,
|
|
chunk_t hash, chunk_t signature)
|
|
{
|
|
bool valid = FALSE;
|
|
ECDSA_SIG *sig;
|
|
|
|
sig = ECDSA_SIG_new();
|
|
if (sig)
|
|
{
|
|
/* split the signature chunk in r and s */
|
|
if (openssl_bn_split(signature, sig->r, sig->s))
|
|
{
|
|
valid = (ECDSA_do_verify(hash.ptr, hash.len, sig, this->ec) == 1);
|
|
}
|
|
ECDSA_SIG_free(sig);
|
|
}
|
|
return valid;
|
|
}
|
|
|
|
/**
|
|
* Verify a RFC 4754 signature for a specified curve and hash algorithm
|
|
*/
|
|
static bool verify_curve_signature(private_openssl_ec_public_key_t *this,
|
|
signature_scheme_t scheme, int nid_hash,
|
|
int nid_curve, chunk_t data, chunk_t signature)
|
|
{
|
|
const EC_GROUP *my_group;
|
|
EC_GROUP *req_group;
|
|
chunk_t hash;
|
|
bool valid;
|
|
|
|
req_group = EC_GROUP_new_by_curve_name(nid_curve);
|
|
if (!req_group)
|
|
{
|
|
DBG1(DBG_LIB, "signature scheme %N not supported in EC (required curve "
|
|
"not supported)", signature_scheme_names, scheme);
|
|
return FALSE;
|
|
}
|
|
my_group = EC_KEY_get0_group(this->ec);
|
|
if (EC_GROUP_cmp(my_group, req_group, NULL) != 0)
|
|
{
|
|
DBG1(DBG_LIB, "signature scheme %N not supported by private key",
|
|
signature_scheme_names, scheme);
|
|
return FALSE;
|
|
}
|
|
EC_GROUP_free(req_group);
|
|
if (!openssl_hash_chunk(nid_hash, data, &hash))
|
|
{
|
|
return FALSE;
|
|
}
|
|
valid = verify_signature(this, hash, signature);
|
|
chunk_free(&hash);
|
|
return valid;
|
|
}
|
|
|
|
/**
|
|
* Verification of a DER encoded signature as in RFC 3279
|
|
*/
|
|
static bool verify_der_signature(private_openssl_ec_public_key_t *this,
|
|
int nid_hash, chunk_t data, chunk_t signature)
|
|
{
|
|
chunk_t hash;
|
|
bool valid = FALSE;
|
|
|
|
/* remove any preceding 0-bytes from signature */
|
|
while (signature.len && signature.ptr[0] == 0x00)
|
|
{
|
|
signature = chunk_skip(signature, 1);
|
|
}
|
|
if (openssl_hash_chunk(nid_hash, data, &hash))
|
|
{
|
|
valid = ECDSA_verify(0, hash.ptr, hash.len,
|
|
signature.ptr, signature.len, this->ec);
|
|
free(hash.ptr);
|
|
}
|
|
return valid;
|
|
}
|
|
|
|
METHOD(public_key_t, get_type, key_type_t,
|
|
private_openssl_ec_public_key_t *this)
|
|
{
|
|
return KEY_ECDSA;
|
|
}
|
|
|
|
METHOD(public_key_t, verify, bool,
|
|
private_openssl_ec_public_key_t *this, signature_scheme_t scheme,
|
|
chunk_t data, chunk_t signature)
|
|
{
|
|
switch (scheme)
|
|
{
|
|
case SIGN_ECDSA_WITH_SHA1_DER:
|
|
return verify_der_signature(this, NID_sha1, data, signature);
|
|
case SIGN_ECDSA_WITH_SHA256_DER:
|
|
return verify_der_signature(this, NID_sha256, data, signature);
|
|
case SIGN_ECDSA_WITH_SHA384_DER:
|
|
return verify_der_signature(this, NID_sha384, data, signature);
|
|
case SIGN_ECDSA_WITH_SHA512_DER:
|
|
return verify_der_signature(this, NID_sha512, data, signature);
|
|
case SIGN_ECDSA_WITH_NULL:
|
|
return verify_signature(this, data, signature);
|
|
case SIGN_ECDSA_256:
|
|
return verify_curve_signature(this, scheme, NID_sha256,
|
|
NID_X9_62_prime256v1, data, signature);
|
|
case SIGN_ECDSA_384:
|
|
return verify_curve_signature(this, scheme, NID_sha384,
|
|
NID_secp384r1, data, signature);
|
|
case SIGN_ECDSA_521:
|
|
return verify_curve_signature(this, scheme, NID_sha512,
|
|
NID_secp521r1, data, signature);
|
|
default:
|
|
DBG1(DBG_LIB, "signature scheme %N not supported in EC",
|
|
signature_scheme_names, scheme);
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
METHOD(public_key_t, encrypt, bool,
|
|
private_openssl_ec_public_key_t *this, encryption_scheme_t scheme,
|
|
chunk_t crypto, chunk_t *plain)
|
|
{
|
|
DBG1(DBG_LIB, "EC public key encryption not implemented");
|
|
return FALSE;
|
|
}
|
|
|
|
METHOD(public_key_t, get_keysize, size_t,
|
|
private_openssl_ec_public_key_t *this)
|
|
{
|
|
return EC_FIELD_ELEMENT_LEN(EC_KEY_get0_group(this->ec));
|
|
}
|
|
|
|
/**
|
|
* Calculate fingerprint from a EC_KEY, also used in ec private key.
|
|
*/
|
|
bool openssl_ec_fingerprint(EC_KEY *ec, cred_encoding_type_t type, chunk_t *fp)
|
|
{
|
|
hasher_t *hasher;
|
|
chunk_t key;
|
|
u_char *p;
|
|
|
|
if (lib->encoding->get_cache(lib->encoding, type, ec, fp))
|
|
{
|
|
return TRUE;
|
|
}
|
|
switch (type)
|
|
{
|
|
case KEYID_PUBKEY_SHA1:
|
|
key = chunk_alloc(i2o_ECPublicKey(ec, NULL));
|
|
p = key.ptr;
|
|
i2o_ECPublicKey(ec, &p);
|
|
break;
|
|
case KEYID_PUBKEY_INFO_SHA1:
|
|
key = chunk_alloc(i2d_EC_PUBKEY(ec, NULL));
|
|
p = key.ptr;
|
|
i2d_EC_PUBKEY(ec, &p);
|
|
break;
|
|
default:
|
|
return FALSE;
|
|
}
|
|
hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
|
|
if (!hasher)
|
|
{
|
|
DBG1(DBG_LIB, "SHA1 hash algorithm not supported, fingerprinting failed");
|
|
free(key.ptr);
|
|
return FALSE;
|
|
}
|
|
hasher->allocate_hash(hasher, key, fp);
|
|
hasher->destroy(hasher);
|
|
free(key.ptr);
|
|
lib->encoding->cache(lib->encoding, type, ec, *fp);
|
|
return TRUE;
|
|
}
|
|
|
|
METHOD(public_key_t, get_fingerprint, bool,
|
|
private_openssl_ec_public_key_t *this, cred_encoding_type_t type,
|
|
chunk_t *fingerprint)
|
|
{
|
|
return openssl_ec_fingerprint(this->ec, type, fingerprint);
|
|
}
|
|
|
|
METHOD(public_key_t, get_encoding, bool,
|
|
private_openssl_ec_public_key_t *this, cred_encoding_type_t type,
|
|
chunk_t *encoding)
|
|
{
|
|
u_char *p;
|
|
|
|
switch (type)
|
|
{
|
|
case PUBKEY_SPKI_ASN1_DER:
|
|
case PUBKEY_PEM:
|
|
{
|
|
bool success = TRUE;
|
|
|
|
*encoding = chunk_alloc(i2d_EC_PUBKEY(this->ec, NULL));
|
|
p = encoding->ptr;
|
|
i2d_EC_PUBKEY(this->ec, &p);
|
|
|
|
if (type == PUBKEY_PEM)
|
|
{
|
|
chunk_t asn1_encoding = *encoding;
|
|
|
|
success = lib->encoding->encode(lib->encoding, PUBKEY_PEM,
|
|
NULL, encoding, CRED_PART_ECDSA_PUB_ASN1_DER,
|
|
asn1_encoding, CRED_PART_END);
|
|
chunk_clear(&asn1_encoding);
|
|
}
|
|
return success;
|
|
}
|
|
default:
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
METHOD(public_key_t, get_ref, public_key_t*,
|
|
private_openssl_ec_public_key_t *this)
|
|
{
|
|
ref_get(&this->ref);
|
|
return &this->public.key;
|
|
}
|
|
|
|
METHOD(public_key_t, destroy, void,
|
|
private_openssl_ec_public_key_t *this)
|
|
{
|
|
if (ref_put(&this->ref))
|
|
{
|
|
if (this->ec)
|
|
{
|
|
lib->encoding->clear_cache(lib->encoding, this->ec);
|
|
EC_KEY_free(this->ec);
|
|
}
|
|
free(this);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generic private constructor
|
|
*/
|
|
static private_openssl_ec_public_key_t *create_empty()
|
|
{
|
|
private_openssl_ec_public_key_t *this;
|
|
|
|
INIT(this,
|
|
.public.key = {
|
|
.get_type = _get_type,
|
|
.verify = _verify,
|
|
.encrypt = _encrypt,
|
|
.get_keysize = _get_keysize,
|
|
.equals = public_key_equals,
|
|
.get_fingerprint = _get_fingerprint,
|
|
.has_fingerprint = public_key_has_fingerprint,
|
|
.get_encoding = _get_encoding,
|
|
.get_ref = _get_ref,
|
|
.destroy = _destroy,
|
|
},
|
|
.ref = 1,
|
|
);
|
|
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* See header.
|
|
*/
|
|
openssl_ec_public_key_t *openssl_ec_public_key_load(key_type_t type,
|
|
va_list args)
|
|
{
|
|
private_openssl_ec_public_key_t *this;
|
|
chunk_t blob = chunk_empty;
|
|
|
|
if (type != KEY_ECDSA)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
while (TRUE)
|
|
{
|
|
switch (va_arg(args, builder_part_t))
|
|
{
|
|
case BUILD_BLOB_ASN1_DER:
|
|
blob = va_arg(args, chunk_t);
|
|
continue;
|
|
case BUILD_END:
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
break;
|
|
}
|
|
this = create_empty();
|
|
this->ec = d2i_EC_PUBKEY(NULL, (const u_char**)&blob.ptr, blob.len);
|
|
if (!this->ec)
|
|
{
|
|
destroy(this);
|
|
return NULL;
|
|
}
|
|
return &this->public;
|
|
}
|
|
#endif /* OPENSSL_NO_EC */
|
|
|