base58Decode

Decodes a Base58 encoded string back into its original raw byte array. This is a standalone utility function from base58.h, crucial for converting user-provided addresses or keys into the binary format required by the library.

Parameters

Parameter	Type	Description
b58	const String&	The input string encoded in Base58.
output	uint8_t*	A pointer to the buffer where the decoded raw bytes will be stored.
outLen	size_t&	An input/output parameter. Initially, it must hold the capacity of the output buffer. On success, it will be updated with the actual number of decoded bytes.

Return Value

• bool: Returns true if the decoding is successful, false otherwise (e.g., invalid Base58 characters).

Example Code (main.cpp)

#include <Arduino.h>
#include "base58.h" // Include the standalone header

void setup() {
    Serial.begin(115200);
    delay(1000);

    Serial.println("\n=== base58Decode Example ===");

    String publicKeyBase58 = "So11111111111111111111111111111111111111112"; // Solana System Program ID
    uint8_t decodedBuffer[32]; // A Solana public key is 32 bytes
    size_t decodedLength = sizeof(decodedBuffer); // Set the capacity

    Serial.println("Decoding: " + publicKeyBase58);

    if (base58Decode(publicKeyBase58, decodedBuffer, decodedLength)) {
        Serial.println("✅ Decoding successful!");
        Serial.print("   -> Decoded length: ");
        Serial.println(decodedLength);
        Serial.print("   -> Decoded data (hex): ");
        for (size_t i = 0; i < decodedLength; i++) {
            if (decodedBuffer[i] < 16) Serial.print("0");
            Serial.print(decodedBuffer[i], HEX);
        }
        Serial.println();
    } else {
        Serial.println("❌ Decoding failed. Check the input string.");
    }
}

void loop() {
    // Can be left empty
}