cx_ecfp.h

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/*******************************************************************************
 *   Ledger Nano S - Secure firmware
 *   (c) 2022 Ledger
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 ********************************************************************************/
 
#ifndef CX_ECFP_H
#define CX_ECFP_H
 
#ifdef HAVE_ECC
 
#include <stddef.h>
#include <stdint.h>
#include "lcx_ecfp.h"
 
#define CX_REG_ECC_SIZE 80
 
#if defined(BOLOS_RELEASE) && defined(HAVE_ECC_WITH_NO_RANDOMIZE)
#error HAVE_ECC_WITH_NO_RANDOMIZE not allowed for release
#endif  // HAVE_ECC_WITH_NO_RANDOMIZE
 
#define CX_BITLEN2BYTELEN(l) (((uint32_t) (l) + 7) >> 3)
 
/* Encoding/Decoding */
 
size_t cx_ecfp_encode_sig_der(uint8_t       *sig,
                              size_t         sig_len,
                              const uint8_t *r,
                              size_t         r_len,
                              const uint8_t *s,
                              size_t         s_len);
int    cx_ecfp_decode_sig_der(const uint8_t  *sig,
                              size_t          sig_len,
                              size_t          max_size,
                              const uint8_t **r,
                              size_t         *r_len,
                              const uint8_t **s,
                              size_t         *s_len);
 
#endif  // HAVE_ECC
 
#endif  // CX_ECFP_H