sapling_util.cpp

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// Copyright (c) 2016-2020 The ZCash developers
// Copyright (c) 2020 The PIVX Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "sapling/sapling_util.h"
#include "sync.h"
 
#include <algorithm>
#include <librustzcash.h>
#include <stdexcept>
#include <iostream>
 
std::vector<unsigned char> convertIntToVectorLE(const uint64_t val_int) {
    std::vector<unsigned char> bytes;
 
    for(size_t i = 0; i < 8; i++) {
        bytes.push_back(val_int >> (i * 8));
    }
 
    return bytes;
}
 
// Convert bytes into boolean vector. (MSB to LSB)
std::vector<bool> convertBytesVectorToVector(const std::vector<unsigned char>& bytes) {
    std::vector<bool> ret;
    ret.resize(bytes.size() * 8);
 
    unsigned char c;
    for (size_t i = 0; i < bytes.size(); i++) {
        c = bytes.at(i);
        for (size_t j = 0; j < 8; j++) {
            ret.at((i*8)+j) = (c >> (7-j)) & 1;
        }
    }
 
    return ret;
}
 
// Convert boolean vector (big endian) to integer
uint64_t convertVectorToInt(const std::vector<bool>& v) {
    if (v.size() > 64) {
        throw std::length_error ("boolean vector can't be larger than 64 bits");
    }
 
    uint64_t result = 0;
    for (size_t i=0; i<v.size();i++) {
        if (v.at(i)) {
            result |= (uint64_t)1 << ((v.size() - 1) - i);
        }
    }
 
    return result;
}
 
uint256 random_uint256() {
    uint256 ret;
    randombytes_buf(ret.begin(), 32);
 
    return ret;
}