Error "SHA1Class SHA1" on an ESP32 when including HTTPClient.h

[ksaye]

I am trying to use the HMACSHA256 signing capability on an ESP32 but I also need the HTTPClient.

When I include the HTTPClient.h, which depends on WiFiClientSecure.h in your sample, I get a redeclaration issue.

Sample code:

  /*
    ArduinoBearSSL SHA256
  
    This sketch demonstrates how to create a SHA256 hash and HMAC
    for an input string.
  
    This example code is in the public domain.
  */
  
  #include <HTTPClient.h>
  #include <ArduinoBearSSL.h>
  #include "SHA256.h"
  
  #ifdef ARDUINO_ARCH_MEGAAVR
  // Create the object
  SHA256Class SHA256;
  #endif
  
  void setup() {
    Serial.begin(9600);
    while (!Serial);
  
    // expect 0xE3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855
    printSHA256("");
  
    // expect 0xD7A8FBB307D7809469CA9ABCB0082E4F8D5651E46D3CDB762D02D0BF37C9E592
    printSHA256("The quick brown fox jumps over the lazy dog");
  
    // expect 0xB613679A0814D9EC772F95D778C35FC5FF1697C493715653C6C712144292C5AD
    printHMACSHA256("", "");
  
    // expect 0xF7BC83F430538424B13298E6AA6FB143EF4D59A14946175997479DBC2D1A3CD8
    printHMACSHA256("key", "The quick brown fox jumps over the lazy dog");
  }
  
  void loop() {
  }
  
  void printSHA256(const char* str) {
    Serial.print("SHA256 of '");
    Serial.print(str);
    Serial.print("' is 0x");
  
    SHA256.beginHash();
    SHA256.print(str);
    SHA256.endHash();
  
    printResult();
  }
  
  void printHMACSHA256(const char* secret, const char* str) {
    Serial.print("HMAC-SHA256 of '");
    Serial.print(str);
    Serial.print("' with secret '");
    Serial.print(secret);
    Serial.print("' is 0x");
  
    SHA256.beginHmac(secret);
    SHA256.print(str);
    SHA256.endHmac();
  
    printResult();
  }
  
  void printResult()
  {
    while (SHA256.available()) {
      byte b = SHA256.read();
  
      if (b < 16) {
        Serial.print("0");
      }
  
      Serial.print(b, HEX);
    }
    Serial.println();
  }

Error:

  In file included from d:\Onedrive - Microsoft\Documents\Arduino\libraries\ArduinoBearSSL\src/ArduinoBearSSL.h:35,
                   from C:\Users\kevinsay\AppData\Local\Temp\.arduinoIDE-unsaved2023911-24336-1vv5l1k.d1vj\SHA256\SHA256.ino:11:
  d:\Onedrive - Microsoft\Documents\Arduino\libraries\ArduinoBearSSL\src/SHA1.h:50:18: error: 'SHA1Class SHA1' redeclared as different kind of symbol
   extern SHA1Class SHA1;
                    ^~~~
  In file included from C:\Users\kevinsay\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11/tools/sdk/esp32s3/include/hal/include/hal/sha_types.h:25,
                   from C:\Users\kevinsay\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11/tools/sdk/esp32s3/include/mbedtls/port/include/sha512_alt.h:28,
                   from C:\Users\kevinsay\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11/tools/sdk/esp32s3/include/mbedtls/mbedtls/include/mbedtls/sha512.h:69,
                   from C:\Users\kevinsay\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11/tools/sdk/esp32s3/include/mbedtls/mbedtls/include/mbedtls/entropy.h:34,
                   from C:\Users\kevinsay\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11\libraries\WiFiClientSecure\src/ssl_client.h:11,
                   from C:\Users\kevinsay\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11\libraries\WiFiClientSecure\src/WiFiClientSecure.h:26,
                   from C:\Users\kevinsay\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11\libraries\HTTPClient\src/HTTPClient.h:37,
                   from C:\Users\kevinsay\AppData\Local\Temp\.arduinoIDE-unsaved2023911-24336-1vv5l1k.d1vj\SHA256\SHA256.ino:10:
  C:\Users\kevinsay\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.11/tools/sdk/esp32s3/include/esp_rom/include/esp32s3/rom/sha.h:25:5: note: previous declaration 'SHA_TYPE SHA1'
       SHA1 = 0,
       ^~~~
  
  exit status 1
  
  Compilation error: exit status 1

[KevinNelSL]

@ksaye did you ever resolve this?

[pennam]

@KevinNelSL you can try to use this PR #89

[elasticdotventures]

This fixed the issue for me. Thanks!