404 lines
9.1 KiB
C
404 lines
9.1 KiB
C
/*
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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_VERIFY
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#include "wolfssl_ec_public_key.h"
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#include "wolfssl_util.h"
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#include <utils/debug.h>
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#include <wolfssl/wolfcrypt/ecc.h>
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#include <wolfssl/wolfcrypt/hash.h>
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#include <wolfssl/wolfcrypt/asn.h>
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typedef struct private_wolfssl_ec_public_key_t private_wolfssl_ec_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_wolfssl_ec_public_key_t {
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/**
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* Public interface
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*/
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wolfssl_ec_public_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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* 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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* Verification of a signature as in RFC 4754
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*/
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static bool verify_signature(private_wolfssl_ec_public_key_t *this,
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chunk_t hash, chunk_t signature)
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{
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int stat = 1, ret = -1;
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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 (wolfssl_mp_split(signature, &r, &s))
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{
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ret = wc_ecc_verify_hash_ex(&r, &s, hash.ptr, hash.len, &stat,
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&this->ec);
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}
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mp_free(&s);
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mp_free(&r);
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return ret == 0 && stat == 1;
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}
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/**
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* Verify a RFC 4754 signature for a specified curve and hash algorithm
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*/
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static bool verify_curve_signature(private_wolfssl_ec_public_key_t *this,
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signature_scheme_t scheme,
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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;
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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 = verify_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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* Verification of a DER encoded signature as in RFC 3279
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*/
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static bool verify_der_signature(private_wolfssl_ec_public_key_t *this,
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enum wc_HashType hash, chunk_t data,
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chunk_t signature)
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{
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chunk_t dgst;
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int stat = 1, ret = -1;
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signature = chunk_skip_zero(signature);
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if (wolfssl_hash_chunk(hash, data, &dgst))
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{
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ret = wc_ecc_verify_hash(signature.ptr, signature.len, dgst.ptr,
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dgst.len, &stat, &this->ec);
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}
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chunk_free(&dgst);
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return ret == 0 && stat == 1;
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}
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METHOD(public_key_t, get_type, key_type_t,
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private_wolfssl_ec_public_key_t *this)
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{
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return KEY_ECDSA;
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}
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METHOD(public_key_t, verify, bool,
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private_wolfssl_ec_public_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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#ifndef NO_SHA
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case SIGN_ECDSA_WITH_SHA1_DER:
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return verify_der_signature(this, WC_HASH_TYPE_SHA, 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_WITH_SHA256_DER:
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return verify_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 verify_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 verify_der_signature(this, WC_HASH_TYPE_SHA512, data,
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signature);
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#endif
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case SIGN_ECDSA_WITH_NULL:
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return verify_signature(this, data, signature);
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#ifndef NO_SHA256
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case SIGN_ECDSA_256:
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return verify_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 verify_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 verify_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 via wolfssl",
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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(public_key_t, encrypt, bool,
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private_wolfssl_ec_public_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 public key encryption not implemented");
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return FALSE;
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}
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METHOD(public_key_t, get_keysize, int,
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private_wolfssl_ec_public_key_t *this)
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{
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return this->keysize;
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}
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/**
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* Calculate fingerprint from an EC key, also used in ec private key.
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*/
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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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hasher_t *hasher;
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chunk_t key;
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int len;
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if (lib->encoding->get_cache(lib->encoding, type, ec, fp))
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{
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return TRUE;
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}
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switch (type)
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{
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case KEYID_PUBKEY_SHA1:
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case KEYID_PUBKEY_INFO_SHA1:
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/* need an additional byte for the point type */
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len = ec->dp->size * 2 + 1;
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if (type == KEYID_PUBKEY_INFO_SHA1)
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{
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/* additional space for algorithmIdentifier/bitString */
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len += 2 * MAX_SEQ_SZ + 2 * MAX_ALGO_SZ + TRAILING_ZERO;
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}
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key = chunk_alloca(len);
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len = wc_EccPublicKeyToDer(ec, key.ptr, key.len,
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type == KEYID_PUBKEY_INFO_SHA1);
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break;
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default:
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return FALSE;
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}
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if (len < 0)
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{
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return FALSE;
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}
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key.len = len;
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hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
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if (!hasher || !hasher->allocate_hash(hasher, key, fp))
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{
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DBG1(DBG_LIB, "SHA1 not supported, fingerprinting failed");
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DESTROY_IF(hasher);
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return FALSE;
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}
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hasher->destroy(hasher);
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lib->encoding->cache(lib->encoding, type, ec, *fp);
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return TRUE;
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}
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METHOD(public_key_t, get_fingerprint, bool,
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private_wolfssl_ec_public_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(public_key_t, get_encoding, bool,
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private_wolfssl_ec_public_key_t *this, cred_encoding_type_t type,
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chunk_t *encoding)
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{
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bool success = TRUE;
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int len;
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/* space for algorithmIdentifier/bitString + one byte for the point type */
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*encoding = chunk_alloc(2 * this->ec.dp->size + 2 * MAX_SEQ_SZ +
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2 * MAX_ALGO_SZ + TRAILING_ZERO + 1);
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len = wc_EccPublicKeyToDer(&this->ec, encoding->ptr, encoding->len, 1);
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if (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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encoding->len = len;
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if (type != PUBKEY_SPKI_ASN1_DER)
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{
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chunk_t asn1_encoding = *encoding;
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success = lib->encoding->encode(lib->encoding, type,
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NULL, encoding, CRED_PART_ECDSA_PUB_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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METHOD(public_key_t, get_ref, public_key_t*,
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private_wolfssl_ec_public_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(public_key_t, destroy, void,
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private_wolfssl_ec_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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lib->encoding->clear_cache(lib->encoding, &this->ec);
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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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* Generic private constructor
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*/
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static private_wolfssl_ec_public_key_t *create_empty()
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{
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private_wolfssl_ec_public_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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.verify = _verify,
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.encrypt = _encrypt,
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.get_keysize = _get_keysize,
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.equals = public_key_equals,
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.get_fingerprint = _get_fingerprint,
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.has_fingerprint = public_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_ecc_init(&this->ec) < 0)
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{
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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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* Described in header
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*/
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wolfssl_ec_public_key_t *wolfssl_ec_public_key_load(key_type_t type,
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va_list args)
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{
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private_wolfssl_ec_public_key_t *this;
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chunk_t blob = chunk_empty;
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word32 idx;
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int ret;
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while (TRUE)
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{
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switch (va_arg(args, builder_part_t))
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{
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case BUILD_BLOB_ASN1_DER:
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blob = va_arg(args, chunk_t);
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continue;
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case BUILD_END:
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break;
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default:
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return NULL;
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}
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break;
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}
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this = create_empty();
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if (!this)
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{
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return NULL;
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}
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idx = 0;
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ret = wc_EccPublicKeyDecode(blob.ptr, &idx, &this->ec, blob.len);
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if (ret < 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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return &this->public;
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}
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#endif /* HAVE_ECC_VERIFY */
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