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check for malformed b33

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orignal 2019-07-04 13:05:39 -04:00
parent 3acfb129cd
commit 3f0534134d
1 changed files with 5 additions and 0 deletions
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5
libi2pd/Blinding.cpp
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@ -139,6 +139,11 @@ namespace data
{
uint8_t addr[40]; // TODO: define length from b33
size_t l = i2p::data::Base32ToByteStream (b33.c_str (), b33.length (), addr, 40);
if (l < 32)
{
LogPrint (eLogError, "Blinding: malformed b33 ", b33);
return;
}
uint32_t checksum = crc32 (0, addr + 3, l - 3);
// checksum is Little Endian
addr[0] ^= checksum; addr[1] ^= (checksum >> 8); addr[2] ^= (checksum >> 16);