wolfssl: Add wolfSSL plugin for cryptographic implementations
This commit is contained in:
Sean Parkinson
committed by
Tobias Brunner
Tobias Brunner
parent
6a995a63f5
commit
c92eade82c
@@ -0,0 +1,508 @@
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/*
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* Copyright (C) 2019 Sean Parkinson, wolfSSL Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "wolfssl_common.h"
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#ifdef HAVE_ECC_SIGN
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#include "wolfssl_ec_private_key.h"
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#include "wolfssl_ec_public_key.h"
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#include "wolfssl_util.h"
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#include <asn1/asn1.h>
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#include <asn1/oid.h>
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#include <utils/debug.h>
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#include <wolfssl/wolfcrypt/ecc.h>
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typedef struct private_wolfssl_ec_private_key_t private_wolfssl_ec_private_key_t;
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/**
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* Private data of a wolfssl_ec_private_key_t object.
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*/
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struct private_wolfssl_ec_private_key_t {
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/**
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* Public interface for this signer.
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*/
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wolfssl_ec_private_key_t public;
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/**
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* Key size
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*/
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int keysize;
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/**
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* EC key object
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*/
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ecc_key ec;
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/**
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* Random number generator
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*/
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WC_RNG rng;
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/**
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* reference count
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*/
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refcount_t ref;
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};
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/* from ec public key */
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bool wolfssl_ec_fingerprint(ecc_key *ec, cred_encoding_type_t type, chunk_t *fp);
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/**
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* Build a signature as in RFC 4754
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*/
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static bool build_signature(private_wolfssl_ec_private_key_t *this,
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chunk_t hash, chunk_t *signature)
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{
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bool success = FALSE;
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mp_int r, s;
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if (mp_init(&r) != 0)
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{
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return FALSE;
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}
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if (mp_init(&s) != 0)
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{
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mp_free(&r);
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return FALSE;
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}
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if (wc_ecc_sign_hash_ex(hash.ptr, hash.len, &this->rng, &this->ec, &r,
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&s) == 0)
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{
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success = wolfssl_mp_cat(this->ec.dp->size * 2, &r, &s, signature);
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}
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mp_free(&s);
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mp_free(&r);
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return success;
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}
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/**
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* Build a RFC 4754 signature for a specified curve and hash algorithm
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*/
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static bool build_curve_signature(private_wolfssl_ec_private_key_t *this,
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signature_scheme_t scheme, enum wc_HashType hash, ecc_curve_id curve_id,
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chunk_t data, chunk_t *signature)
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{
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bool success = FALSE;
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chunk_t dgst = chunk_empty;
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if (curve_id != this->ec.dp->id)
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{
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DBG1(DBG_LIB, "signature scheme %N not supported by private key",
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signature_scheme_names, scheme);
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return FALSE;
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}
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if (wolfssl_hash_chunk(hash, data, &dgst))
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{
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success = build_signature(this, dgst, signature);
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}
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chunk_free(&dgst);
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return success;
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}
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/**
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* Build a DER encoded signature as in RFC 3279
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*/
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static bool build_der_signature(private_wolfssl_ec_private_key_t *this,
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enum wc_HashType hash, chunk_t data, chunk_t *signature)
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{
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bool success = FALSE;
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chunk_t dgst = chunk_empty;
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int ret;
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word32 len;
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if (wolfssl_hash_chunk(hash, data, &dgst))
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{
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*signature = chunk_alloc(this->ec.dp->size * 2 + 10);
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len = signature->len;
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ret = wc_ecc_sign_hash(dgst.ptr, dgst.len, signature->ptr, &len,
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&this->rng, &this->ec);
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if (ret == 0)
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{
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signature->len = len;
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success = TRUE;
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}
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else
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{
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chunk_free(signature);
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}
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}
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chunk_free(&dgst);
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return success;
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}
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METHOD(private_key_t, sign, bool,
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private_wolfssl_ec_private_key_t *this, signature_scheme_t scheme,
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void *params, chunk_t data, chunk_t *signature)
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{
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switch (scheme)
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{
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case SIGN_ECDSA_WITH_NULL:
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return build_signature(this, data, signature);
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#ifndef NO_SHA
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case SIGN_ECDSA_WITH_SHA1_DER:
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return build_der_signature(this, WC_HASH_TYPE_SHA, data, signature);
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#endif
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#ifndef NO_SHA256
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case SIGN_ECDSA_WITH_SHA256_DER:
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return build_der_signature(this, WC_HASH_TYPE_SHA256, data,
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signature);
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#endif
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#ifdef WOLFSSL_SHA384
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case SIGN_ECDSA_WITH_SHA384_DER:
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return build_der_signature(this, WC_HASH_TYPE_SHA384, data,
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signature);
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#endif
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#ifdef WOLFSSL_SHA512
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case SIGN_ECDSA_WITH_SHA512_DER:
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return build_der_signature(this, WC_HASH_TYPE_SHA512, data,
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signature);
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#endif
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#ifndef NO_SHA256
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case SIGN_ECDSA_256:
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return build_curve_signature(this, scheme, WC_HASH_TYPE_SHA256,
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ECC_SECP256R1, data, signature);
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#endif
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#ifdef WOLFSSL_SHA384
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case SIGN_ECDSA_384:
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return build_curve_signature(this, scheme, WC_HASH_TYPE_SHA384,
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ECC_SECP384R1, data, signature);
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#endif
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#ifdef WOLFSSL_SHA512
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case SIGN_ECDSA_521:
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return build_curve_signature(this, scheme, WC_HASH_TYPE_SHA512,
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ECC_SECP521R1, data, signature);
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#endif
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default:
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DBG1(DBG_LIB, "signature scheme %N not supported",
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signature_scheme_names, scheme);
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return FALSE;
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}
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}
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METHOD(private_key_t, decrypt, bool,
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private_wolfssl_ec_private_key_t *this, encryption_scheme_t scheme,
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chunk_t crypto, chunk_t *plain)
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{
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DBG1(DBG_LIB, "EC private key decryption not implemented");
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return FALSE;
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}
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METHOD(private_key_t, get_keysize, int,
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private_wolfssl_ec_private_key_t *this)
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{
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return this->keysize;
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}
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METHOD(private_key_t, get_type, key_type_t,
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private_wolfssl_ec_private_key_t *this)
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{
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return KEY_ECDSA;
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}
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METHOD(private_key_t, get_public_key, public_key_t*,
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private_wolfssl_ec_private_key_t *this)
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{
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public_key_t *public;
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chunk_t key;
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int ret;
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key = chunk_alloc((this->keysize + 7) / 8 * 5);
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ret = wc_EccPublicKeyToDer(&this->ec, key.ptr, key.len, 1);
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if (ret < 0)
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{
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chunk_free(&key);
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return NULL;
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}
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key.len = ret;
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public = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_ECDSA,
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BUILD_BLOB_ASN1_DER, key, BUILD_END);
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free(key.ptr);
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return public;
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}
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METHOD(private_key_t, get_fingerprint, bool,
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private_wolfssl_ec_private_key_t *this, cred_encoding_type_t type,
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chunk_t *fingerprint)
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{
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return wolfssl_ec_fingerprint(&this->ec, type, fingerprint);
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}
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METHOD(private_key_t, get_encoding, bool,
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private_wolfssl_ec_private_key_t *this, cred_encoding_type_t type,
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chunk_t *encoding)
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{
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switch (type)
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{
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case PRIVKEY_ASN1_DER:
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case PRIVKEY_PEM:
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{
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bool success = TRUE;
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*encoding = chunk_alloc(this->keysize * 4 + 30);
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if (wc_EccPrivateKeyToDer(&this->ec, encoding->ptr,
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encoding->len) < 0)
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{
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chunk_free(encoding);
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return FALSE;
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}
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if (type == PRIVKEY_PEM)
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{
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chunk_t asn1_encoding = *encoding;
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success = lib->encoding->encode(lib->encoding, PRIVKEY_PEM,
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NULL, encoding, CRED_PART_ECDSA_PRIV_ASN1_DER,
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asn1_encoding, CRED_PART_END);
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chunk_clear(&asn1_encoding);
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}
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return success;
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}
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default:
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return FALSE;
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}
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}
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METHOD(private_key_t, get_ref, private_key_t*,
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private_wolfssl_ec_private_key_t *this)
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{
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ref_get(&this->ref);
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return &this->public.key;
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}
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METHOD(private_key_t, destroy, void,
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private_wolfssl_ec_private_key_t *this)
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{
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if (ref_put(&this->ref))
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{
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lib->encoding->clear_cache(lib->encoding, &this->ec);
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wc_FreeRng(&this->rng);
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wc_ecc_free(&this->ec);
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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_wolfssl_ec_private_key_t *create_empty(void)
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{
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private_wolfssl_ec_private_key_t *this;
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INIT(this,
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.public = {
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.key = {
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.get_type = _get_type,
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.sign = _sign,
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.decrypt = _decrypt,
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.get_keysize = _get_keysize,
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.get_public_key = _get_public_key,
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.equals = private_key_equals,
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.belongs_to = private_key_belongs_to,
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.get_fingerprint = _get_fingerprint,
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.has_fingerprint = private_key_has_fingerprint,
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.get_encoding = _get_encoding,
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.get_ref = _get_ref,
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.destroy = _destroy,
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},
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},
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.ref = 1,
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);
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if (wc_InitRng(&this->rng) < 0)
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{
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DBG1(DBG_LIB, "Random number generation init failed");
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free(this);
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return NULL;
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}
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return this;
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}
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/*
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* See header.
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*/
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wolfssl_ec_private_key_t *wolfssl_ec_private_key_gen(key_type_t type,
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va_list args)
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{
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private_wolfssl_ec_private_key_t *this;
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u_int key_size = 0;
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ecc_curve_id curve_id;
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while (TRUE)
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{
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switch (va_arg(args, builder_part_t))
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{
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case BUILD_KEY_SIZE:
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key_size = va_arg(args, u_int);
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continue;
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case BUILD_END:
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break;
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default:
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return NULL;
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}
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break;
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}
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if (!key_size)
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{
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return NULL;
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}
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this = create_empty();
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this->keysize = key_size;
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switch (key_size)
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{
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case 256:
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curve_id = ECC_SECP256R1;
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break;
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case 384:
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curve_id = ECC_SECP384R1;
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break;
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case 521:
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curve_id = ECC_SECP521R1;
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break;
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default:
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DBG1(DBG_LIB, "EC private key size %d not supported", key_size);
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destroy(this);
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return NULL;
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}
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if (wc_ecc_make_key_ex(&this->rng, (key_size + 7) / 8, &this->ec,
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curve_id) < 0)
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{
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DBG1(DBG_LIB, "EC private key generation failed", key_size);
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destroy(this);
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return NULL;
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}
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return &this->public;
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}
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/**
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* See header.
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*/
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wolfssl_ec_private_key_t *wolfssl_ec_private_key_load(key_type_t type,
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va_list args)
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{
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private_wolfssl_ec_private_key_t *this;
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chunk_t params = chunk_empty;
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chunk_t key = chunk_empty;
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chunk_t alg_id = chunk_empty;
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word32 idx;
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int oid;
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while (TRUE)
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{
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switch (va_arg(args, builder_part_t))
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{
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case BUILD_BLOB_ALGID_PARAMS:
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params = va_arg(args, chunk_t);
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continue;
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case BUILD_BLOB_ASN1_DER:
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key = va_arg(args, chunk_t);
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continue;
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case BUILD_END:
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break;
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default:
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return NULL;
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}
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break;
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}
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if (key.ptr == NULL)
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{
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return NULL;
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}
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this = create_empty();
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idx = 0;
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if (wc_EccPrivateKeyDecode(key.ptr, &idx, &this->ec, key.len) < 0)
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{
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destroy(this);
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return NULL;
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}
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switch (this->ec.dp->id)
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{
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case ECC_SECP256R1:
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this->keysize = 256;
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break;
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case ECC_SECP384R1:
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this->keysize = 384;
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break;
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case ECC_SECP521R1:
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this->keysize = 521;
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break;
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default:
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break;
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}
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if (params.ptr)
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{
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/* if ECParameters is passed, check we guessed correct */
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alg_id = asn1_algorithmIdentifier_params(OID_EC_PUBLICKEY,
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chunk_clone(params));
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if (asn1_unwrap(¶ms, ¶ms) == ASN1_OID)
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{
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oid = asn1_known_oid(params);
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switch (oid)
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{
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case OID_PRIME256V1:
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if (this->ec.dp->id != ECC_SECP256R1)
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{
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oid = OID_UNKNOWN;
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}
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break;
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case OID_SECT384R1:
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if (this->ec.dp->id != ECC_SECP384R1)
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{
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oid = OID_UNKNOWN;
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}
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break;
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case OID_SECT521R1:
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if (this->ec.dp->id != ECC_SECP521R1)
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{
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oid = OID_UNKNOWN;
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}
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break;
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default:
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oid = OID_UNKNOWN;
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break;
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}
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}
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chunk_free(&alg_id);
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if (oid == OID_UNKNOWN)
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{
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DBG1(DBG_LIB, "parameters do not match private key data");
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destroy(this);
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return NULL;
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}
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}
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return &this->public;
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}
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#endif /* HAVE_ECC_SIGN */
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Reference in New Issue
Block a user