/*%
* dst_s_dns_key_id() Function to calculate DNSSEC footprint from KEY record
* rdata
* Input:
* dns_key_rdata: the raw data in wire format
* rdata_len: the size of the input data
* Output:
* the key footprint/id calculated from the key data
*/
u_int16_t
dst_s_dns_key_id(const u_char *dns_key_rdata, const int rdata_len)
{
if (!dns_key_rdata)
return 0;
/* compute id */
if (dns_key_rdata[3] == KEY_RSA) /*%< Algorithm RSA */
return dst_s_get_int16((const u_char *)
&dns_key_rdata[rdata_len - 3]);
else if (dns_key_rdata[3] == KEY_HMAC_MD5)
/* compatibility */
return 0;
else
/* compute a checksum on the key part of the key rr */
return dst_s_id_calc(dns_key_rdata, rdata_len);
}
/*
* dst_s_dns_key_id() Function to calculated DNSSEC footprint from KEY record
* rdata (all of record)
* Input:
* dns_key_rdata: the raw data in wire format
* rdata_len: the size of the input data
* Output:
* the key footprint/id calculated from the key data
*/
u_int16_t
dst_s_dns_key_id(const u_char *dns_key_rdata, const unsigned rdata_len)
{
unsigned key_data = 4;
if (!dns_key_rdata || (rdata_len < key_data))
return 0;
/* check the extended parameters bit in the DNS Key RR flags */
if (dst_s_get_int16(dns_key_rdata) & DST_EXTEND_FLAG)
key_data += 2;
/* compute id */
if (dns_key_rdata[3] == KEY_RSA) /* Algorithm RSA */
return dst_s_get_int16((const u_char *)
&dns_key_rdata[rdata_len - 3]);
else
/* compute a checksum on the key part of the key rr */
return dst_s_id_calc(&dns_key_rdata[key_data],
(rdata_len - key_data));
}
