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Util.cpp
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Util.cpp
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// util.cpp Copyright 2013 Owen Lynn <owen.lynn@gmail.com>
// Released under the GNU Public License V3
#include "Util.h"
#include "sha256.h"
// sorta dodgy - finds the 3rd 0x30 and then copies everything from
// there to the end.
std::string Utility::OSSLPublicKey2ZCPublicKey(const std::string &in)
{
std::string out;
unsigned int i=0,j=0;
while(i<in.length() && j<3) {
if (in[i] == 0x30) { ++j; }
++i;
}
if (i > 0 && j == 3) {
--i;
out = in.substr(i);
}
return out;
}
std::string Utility::StripAllWhitespace(const std::string &in)
{
std::string out;
for (unsigned int i=0; i<in.length(); ++i) {
if (!isspace(in[i])) {
out += in[i];
}
}
return out;
}
static const std::string base64_chars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
static inline bool is_base64(unsigned char c)
{
return (isalnum(c) || (c == '+') || (c == '/'));
}
std::string Utility::Base64Encode(const std::string &in)
{
std::string ret;
int i = 0;
int j = 0;
unsigned char char_array_3[3];
unsigned char char_array_4[4];
unsigned int in_len = in.length();
const unsigned char *p = (const unsigned char *)in.c_str();
while (in_len--) {
char_array_3[i++] = *(p++);
if (i == 3) {
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for(i = 0; i<4; i++) {
ret += base64_chars[char_array_4[i]];
}
i = 0;
}
}
if (i) {
for(j = i; j < 3; j++) {
char_array_3[j] = '\0';
}
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (j = 0; j < (i + 1); j++) {
ret += base64_chars[char_array_4[j]];
}
while((i++ < 3)) {
ret += '=';
}
}
return ret;
}
std::string Utility::Base64Decode(const std::string &raw)
{
std::string in = StripAllWhitespace(raw);
size_t in_len = in.size();
size_t i = 0;
size_t j = 0;
int k = 0;
unsigned char char_array_4[4], char_array_3[3];
std::string ret;
while (in_len-- && ( in[k] != '=') && is_base64(in[k])) {
char_array_4[i++] = in[k]; k++;
if (4 == i) {
for (i = 0; i<4; i++) {
char_array_4[i] = static_cast<unsigned char>(base64_chars.find(char_array_4[i]));
}
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (i = 0; i<3; i++) {
ret += char_array_3[i];
}
i = 0;
}
}
if (i) {
for (j = i; j<4; j++) {
char_array_4[j] = 0;
}
for (j = 0; j<4; j++) {
char_array_4[j] = static_cast<unsigned char>(base64_chars.find(char_array_4[j]));
}
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (j = 0; j < (i-1); j++) { ret += char_array_3[j]; }
}
return ret;
}
// there's no good automatic way to decode a hex string in std::C++
std::string Utility::HexDecode(const std::string &in)
{
std::string out;
if ((in.length() % 2) == 0) {
char buf[3] = {0,0,0};
for(unsigned int i=0; i<in.length(); i += 2) {
buf[0] = in[i];
buf[1] = in[i+1];
out.push_back((char)strtoul(buf,0,16));
}
}
return out;
}
std::string Utility::HexEncode(const std::string &in)
{
const char *tbl = "0123456789abcdef";
std::string out;
unsigned char hi,lo;
for(unsigned int i=0; i<in.length(); ++i) {
hi = ((unsigned char)in[i] >> 4);
lo = ((unsigned char)in[i] & 0x0f);
out.push_back(tbl[hi]);
out.push_back(tbl[lo]);
}
return out;
}
unsigned long Utility::ToSatoshis(double amount)
{
return (unsigned long)(amount * 1e8 + (amount < 0.0 ? -.5 : .5));
}
double Utility::FromSatoshis(unsigned long amount)
{
return ((double)amount / 1e8);
}
std::string Utility::Sha256Hash(const std::string &in)
{
std::string out;
unsigned char digest[32];
sha256_context ctx;
sha256_starts(&ctx);
sha256_update(&ctx,(unsigned char*)in.c_str(),in.length());
sha256_finish(&ctx,digest);
out.append((char *)digest,sizeof(digest));
return out;
}
long Utility::CheckSum(const std::string &in)
{
long sum = 0;
for(unsigned int i=0; i<in.length(); ++i) {
sum += (unsigned char)in[i];
}
return sum;
}