int
ds_sha384_hash_is_equal(u_char * name_n,
u_char * rrdata,
size_t rrdatalen,
u_char * ds_hash,
size_t ds_hash_len)
{
u_char ds_digest[SHA384_DIGEST_LENGTH];
size_t namelen;
SHA512_CTX c;
size_t l_index;
u_char qc_name_n[NS_MAXCDNAME];
if (rrdata == NULL || ds_hash_len != SHA384_DIGEST_LENGTH)
return 0;
namelen = wire_name_length(name_n);
memcpy(qc_name_n, name_n, namelen);
l_index = 0;
lower_name(qc_name_n, &l_index);
memset(ds_digest, 0, SHA384_DIGEST_LENGTH);
SHA384_Init(&c);
SHA384_Update(&c, qc_name_n, namelen);
SHA384_Update(&c, rrdata, rrdatalen);
SHA384_Final(ds_digest, &c);
if (!memcmp(ds_digest, ds_hash, SHA384_DIGEST_LENGTH))
return 1;
return 0;
}
u_char *
nsec3_sha_hash_compute(u_char * name_n, u_char * salt,
size_t saltlen, size_t iter, u_char ** hash,
size_t * hashlen)
{
/*
* Assume that the caller has already performed all sanity checks
*/
SHA_CTX c;
size_t i;
size_t l_index;
int len = wire_name_length(name_n);
u_char qc_name_n[NS_MAXCDNAME];
memcpy(qc_name_n, name_n, len);
l_index = 0;
lower_name(qc_name_n, &l_index);
*hash = (u_char *) MALLOC(SHA_DIGEST_LENGTH * sizeof(u_char));
if (*hash == NULL)
return NULL;
*hashlen = SHA_DIGEST_LENGTH;
memset(*hash, 0, SHA_DIGEST_LENGTH);
/*
* IH(salt, x, 0) = H( x || salt)
*/
SHA1_Init(&c);
SHA1_Update(&c, qc_name_n, wire_name_length(qc_name_n));
SHA1_Update(&c, salt, saltlen);
SHA1_Final(*hash, &c);
/*
* IH(salt, x, k) = H(IH(salt, x, k-1) || salt)
*/
for (i = 0; i < iter; i++) {
SHA1_Init(&c);
SHA1_Update(&c, *hash, *hashlen);
SHA1_Update(&c, salt, saltlen);
SHA1_Final(*hash, &c);
}
return *hash;
}
/*
* Create the buffer over which the signature is to be verified
*/
static int
make_sigfield(u_char ** field,
size_t * field_length,
struct rrset_rec *rr_set,
struct rrset_rr *rr_sig, int is_a_wildcard)
{
struct rrset_rr *curr_rr;
size_t index;
size_t signer_length;
size_t owner_length;
u_int16_t type_n;
u_int16_t class_n;
u_int32_t ttl_n;
u_int16_t rdata_length_n;
u_char lowered_owner_n[NS_MAXCDNAME];
size_t l_index;
int retval;
if ((field == NULL) || (field_length == NULL) || (rr_set == NULL) ||
(rr_sig == NULL) || (rr_set->rrs_name_n == NULL) ||
(rr_set->rrs_sig == NULL) ||
(rr_set->rrs_sig->rr_rdata == NULL))
return VAL_BAD_ARGUMENT;
if ((retval = predict_sigbuflength(rr_set, field_length, &signer_length)) !=
VAL_NO_ERROR)
return retval;
*field = (u_char *) MALLOC(*field_length * sizeof(u_char));
if (*field == NULL)
return VAL_OUT_OF_MEMORY;
/*
* Make sure we are using the correct TTL
*/
memcpy(&ttl_n, &rr_sig->rr_rdata[TTL], sizeof(u_int32_t));
rr_set->rrs_ttl_h = ntohl(ttl_n);
/*
* While we're at it, we'll gather other common info, specifically
* network ordered numbers (type, class) and name length.
*/
owner_length = wire_name_length(rr_set->rrs_name_n);
if (owner_length == 0)
goto err;
memcpy(lowered_owner_n, rr_set->rrs_name_n, owner_length);
l_index = 0;
lower_name(lowered_owner_n, &l_index);
type_n = htons(rr_set->rrs_type_h);
class_n = htons(rr_set->rrs_class_h);
/*
* Copy in the SIG RDATA (up to the signature
*/
index = 0;
if ((index + SIGNBY + signer_length) > *field_length)
goto err;
memcpy(&(*field)[index], rr_sig->rr_rdata, SIGNBY + signer_length);
l_index = 0;
lower_name(&(*field)[index+SIGNBY], &l_index);
index += SIGNBY + signer_length;
/*
* For each record of data, copy in the envelope & the lower cased rdata
*/
for (curr_rr = rr_set->rrs_data; curr_rr;
curr_rr = curr_rr->rr_next) {
if (curr_rr->rr_rdata == NULL)
goto err;
/*
* Copy in the envelope information
*/
if (is_a_wildcard) {
/*
* Construct the original name
*/
u_char wcard_n[NS_MAXCDNAME];
u_char *np = lowered_owner_n;
int i;
size_t outer_len;
for (i = 0; i < is_a_wildcard; i++)
np += np[0] + 1;
outer_len = wire_name_length(np);
wcard_n[0] = (u_char) 1;
wcard_n[1] = '*';
if ((outer_len + 2) > sizeof(wcard_n))
goto err;
memcpy(&wcard_n[2], np, outer_len);
if ((index + outer_len + 2) > *field_length)
goto err;
memcpy(&(*field)[index], wcard_n, outer_len + 2);
index += outer_len + 2;
} else {
if ((index + owner_length) > *field_length)
goto err;
memcpy(&(*field)[index], lowered_owner_n, owner_length);
index += owner_length;
}
if ((index + sizeof(u_int16_t) + sizeof(u_int16_t) +
sizeof(u_int32_t))
> *field_length)
goto err;
memcpy(&(*field)[index], &type_n, sizeof(u_int16_t));
index += sizeof(u_int16_t);
memcpy(&(*field)[index], &class_n, sizeof(u_int16_t));
index += sizeof(u_int16_t);
memcpy(&(*field)[index], &ttl_n, sizeof(u_int32_t));
index += sizeof(u_int32_t);
/*
* Now the RR-specific info, the length and the data
*/
rdata_length_n = htons(curr_rr->rr_rdata_length);
if ((index + sizeof(u_int16_t) + curr_rr->rr_rdata_length)
> *field_length)
goto err;
memcpy(&(*field)[index], &rdata_length_n, sizeof(u_int16_t));
index += sizeof(u_int16_t);
memcpy(&(*field)[index], curr_rr->rr_rdata,
curr_rr->rr_rdata_length);
index += curr_rr->rr_rdata_length;
}
*field_length = index;
return VAL_NO_ERROR;
err:
FREE(*field);
*field = NULL;
*field_length = 0;
return VAL_BAD_ARGUMENT;
}
