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KBKDF

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This commit is contained in:
Adam Ierymenko 2019-09-05 11:39:16 -07:00
parent 70648d006d
commit 44dd52d08f
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GPG key ID: C8877CF2D7A5D7F3
3 changed files with 47 additions and 13 deletions
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21
node/SHA512.cpp
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@ -274,4 +274,25 @@ void HMACSHA384(const uint8_t key[32],const void *msg,const unsigned int msglen,
SHA384(mac,outer,176); // H(output padded key | H(input padded key | msg))
}
void KBKDFHMACSHA384(const uint8_t key[32],const char label,const char context,const uint32_t iter,uint8_t out[32])
{
uint8_t kbkdfMsg[13];
uint8_t kbuf[48];
kbkdfMsg[0] = (uint8_t)(iter >> 24);
kbkdfMsg[1] = (uint8_t)(iter >> 16);
kbkdfMsg[2] = (uint8_t)(iter >> 8);
kbkdfMsg[3] = (uint8_t)iter;
kbkdfMsg[4] = (uint8_t)'Z';
kbkdfMsg[5] = (uint8_t)'T'; // preface our labels with something ZT-specific
kbkdfMsg[6] = (uint8_t)label;
kbkdfMsg[7] = 0;
kbkdfMsg[8] = (uint8_t)context;
kbkdfMsg[9] = 0;
kbkdfMsg[10] = 0;
kbkdfMsg[11] = 1;
kbkdfMsg[12] = 0; // key length: 256 bits as big-endian 32-bit value
HMACSHA384(key,&kbkdfMsg,sizeof(kbkdfMsg),kbuf);
memcpy(out,kbuf,32);
}
} // namespace ZeroTier