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This commit is contained in:
Adam Ierymenko 2019-07-17 16:53:33 -05:00
parent fe2215df00
commit 7e105343e2
5 changed files with 273 additions and 30 deletions
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74
node/Utils.cpp
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@ -55,9 +55,6 @@ namespace ZeroTier {
const char Utils::HEXCHARS[16] = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
const char Utils::BASE32CHARS[32] = { 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','2','3','4','5','6','7' };
const uint8_t Utils::BASE32BITS[256] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,26,27,28,29,30,31,0,0,0,0,0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,0,0,0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
// Crazy hack to force memory to be securely zeroed in spite of the best efforts of optimizing compilers.
static void _Utils_doBurn(volatile uint8_t *ptr,unsigned int len)
{
@ -174,4 +171,75 @@ void Utils::getSecureRandom(void *buf,unsigned int bytes)
#endif // __WINDOWS__ or not
}
int Utils::b32d(const char *encoded, uint8_t *result, int bufSize)
{
int buffer = 0;
int bitsLeft = 0;
int count = 0;
for (const uint8_t *ptr = (const uint8_t *)encoded;count<bufSize && *ptr; ++ptr) {
uint8_t ch = *ptr;
if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n' || ch == '-' || ch == '.') {
continue;
}
buffer <<= 5;
if (ch == '0') {
ch = 'O';
} else if (ch == '1') {
ch = 'L';
} else if (ch == '8') {
ch = 'B';
}
if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
ch = (ch & 0x1F) - 1;
} else if (ch >= '2' && ch <= '7') {
ch -= '2' - 26;
} else {
return -1;
}
buffer |= ch;
bitsLeft += 5;
if (bitsLeft >= 8) {
result[count++] = buffer >> (bitsLeft - 8);
bitsLeft -= 8;
}
}
if (count < bufSize)
result[count] = (uint8_t)0;
return count;
}
int Utils::b32e(const uint8_t *data,int length,char *result,int bufSize)
{
if (length < 0 || length > (1 << 28))
return -1;
int count = 0;
if (length > 0) {
int buffer = data[0];
int next = 1;
int bitsLeft = 8;
while (count < bufSize && (bitsLeft > 0 || next < length)) {
if (bitsLeft < 5) {
if (next < length) {
buffer <<= 8;
buffer |= data[next++] & 0xFF;
bitsLeft += 8;
} else {
int pad = 5 - bitsLeft;
buffer <<= pad;
bitsLeft += pad;
}
}
int index = 0x1F & (buffer >> (bitsLeft - 5));
bitsLeft -= 5;
result[count++] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"[index];
}
}
if (count < bufSize)
result[count] = (char)0;
return count;
}
} // namespace ZeroTier