eoskeys.c

/*
**  (c)maester.xyz
**  EOSIO keys and address CLang lib
**  No dependence except clib. Can be used on linux, windows, Android or iOS
*/

#include <stdlib.h>
#include <stdio.h>
#include "ecdsa.h"
#include "bignum256.h"
#include "hash.h"
#include "sha256.h"
#include "ripemd160.h"
#include "base58.h"


void eosPrivate2Address(const char privIn[64], char * privStr, char *addrStr)
{
    HashState hs; 
    uint8_t priv[32];
    uint8_t x[32];
    uint8_t y[32];
    uint8_t pub33[33];
    uint8_t hash[32];
    uint8_t pub37[37];
    uint8_t pub37Rev[37];
    uint8_t priv37[37];
    uint8_t priv37Rev[37];
    int i;

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

    if(y[0] % 2)
        pub33[32] = 0x03;
    else 
        pub33[32] = 0x02;
    
    memcpy(pub33, x, 32);

    ripemd160Begin(&hs);
    for(i=0; i<33; i++)
        ripemd160WriteByte(&hs, pub33[32-i]);
    ripemd160Finish(&hs);
    writeHashToByteArray(hash, &hs, true);

    for(i=0; i<4; i++)
    {
        pub37[i] = hash[3-i];
    }
    memcpy(pub37+4, pub33, 33);

    for(i=36; i>=0; i--)
        pub37Rev[i] = pub37[36-i];
    size_t len = 256;
    b58enc(addrStr, &len, pub37Rev, 37);
    addrStr[len] = 0;

//////////////////////////////////////////////
// Priv-WIF

    memcpy(priv37+4, priv, 32);
    priv37[36] = 0x80;


    sha256Begin(&hs);
    for(i=0; i<33; i++)
        sha256WriteByte(&hs, priv37[36-i]);
    sha256FinishDouble(&hs);    
    writeHashToByteArray(hash, &hs, true);

    for(i=0; i<4; i++)
    {
        priv37[i] = hash[3-i];
    }

    for(i=36; i>=0; i--)
        priv37Rev[i] = priv37[36-i];
    len = 256;
    b58enc(privStr, &len, priv37Rev, 37);
    privStr[len] = 0;
}