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chg: [client] Check if hmac context exists

pull/23/head
Gerard Wagener 2018-12-20 14:41:56 +01:00
parent d413cc68dc
commit 081f3e027e
1 changed files with 7 additions and 5 deletions
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12
client/d4.c
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@ -199,12 +199,14 @@ void d4_transfert(d4_t* d4)
if ( nread > 0 ) {
d4_update_header(d4, nread);
//Do HMAC on header and payload. HMAC field is 0 during computation
hmac_sha256_update(d4->ctx, (const unsigned char*)&d4->header,
if (d4->ctx) {
hmac_sha256_update(d4->ctx, (const unsigned char*)&d4->header,
sizeof(d4_header_t));
hmac_sha256_update(d4->ctx, (const unsigned char*)buf, nread);
hmac_sha256_final(d4->ctx, hmac, SZHMAC);
//Add it to the header
memcpy(d4->header.hmac, hmac, SZHMAC);
hmac_sha256_update(d4->ctx, (const unsigned char*)buf, nread);
hmac_sha256_final(d4->ctx, hmac, SZHMAC);
//Add it to the header
memcpy(d4->header.hmac, hmac, SZHMAC);
}
n = 0;
n+=write(d4->destination.fd, &d4->header.version, sizeof(uint8_t));
n+=write(d4->destination.fd, &d4->header.type, sizeof(uint8_t));