// Copyright 2024 Espressif Systems (Shanghai) PTE LTD
//
// 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.

#include <Arduino.h>
#if ESP_IDF_VERSION_MAJOR < 5

#ifndef SHA1Builder_h
#define SHA1Builder_h

#include <Stream.h>
#include <WString.h>

#define SHA1_HASH_SIZE 20

class SHA1Builder {
  private:
    uint32_t total[2];            /* number of bytes processed  */
    uint32_t state[5];            /* intermediate digest state  */
    unsigned char buffer[64];     /* data block being processed */
    uint8_t hash[SHA1_HASH_SIZE]; /* SHA-1 result               */

    void process(const uint8_t* data);

  public:
    void begin();
    void add(const uint8_t* data, size_t len);
    void calculate();
    void getBytes(uint8_t* output);
};

#endif // SHA1Builder_h

#endif // ESP_IDF_VERSION_MAJOR < 5