Ethereum_Address_C_Lib/etherkeys.c at master · ELLIPAL/Ethereum_Address_C_Lib · GitHub

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/*
**  (C)ELLIPAL, Tong Chen
**
**  Ethereum private key to address
**     - CLang lib
**     - No dependence. Can be used on linux, windows, Android and iOS
*/


#include "ecdsa.h"
#include "bignum256.h"
#include "keccak.h"
#include "etherkeys.h"


void etherPrivate2Address(const char privStr[BN256_STR_LEN], char addrStr[ETH_ADD_STR_LEN])
{
    int i;
    uint8_t temp;
    uint8_t priv[32];
    uint8_t x[32];
    uint8_t y[32];
    uint8_t pub64[64];
    uint8_t outBuff[32];

    bigFromHexString(privStr, priv);
    ecPubkey(priv, x, y);

    memcpy(pub64, y, 32);
    memcpy(pub64+32, x, 32);

    for(i=0; i<32; i++)
    {
        temp = pub64[i];
        pub64[i] = pub64[63-i];
        pub64[63-i] = temp;
    }

    keccak256(outBuff, 32, pub64, 64);

#ifdef __DEBUG
    printf("PUB1: %s\n", pubStr128);
    printf("PUB:  ");
    for(i=0; i<64; i++)
        printf("%02x", pub64[63-i]);

    printf("\n\nKeccak: \n");
    for(i=0; i<32; i++)
        printf("%02x", outBuff[i]);

    printf("\n\n");
#endif


    sprintf(addrStr, "0x");
    for(i=0; i<20; i++)
        sprintf(addrStr+2+i*2, "%02x", outBuff[12+i]);
}