void
hmac_init(struct hmac_ctx *ctx,
const struct hash_desc *h,
const u_char *key, size_t key_len)
{
int k;
ctx->h = h;
ctx->hmac_digest_size = h->hash_digest_size;
/* Prepare the two pads for the HMAC */
memset(ctx->buf1, '\0', h->hash_block_size);
if (key_len <= h->hash_block_size)
{
memcpy(ctx->buf1, key, key_len);
}
else
{
h->hash_init(&ctx->hash_ctx);
h->hash_update(&ctx->hash_ctx, key, key_len);
h->hash_final(ctx->buf1, &ctx->hash_ctx);
}
memcpy(ctx->buf2, ctx->buf1, h->hash_block_size);
for (k = 0; k < h->hash_block_size; k++)
{
ctx->buf1[k] ^= HMAC_IPAD;
ctx->buf2[k] ^= HMAC_OPAD;
}
hmac_reinit(ctx);
}
void
hmac_init(struct hmac_ctx *ctx,
const struct hash_desc *h,
const u_char *key, size_t key_len)
{
#ifndef HAVE_LIBNSS
int k;
#endif
ctx->h = h;
ctx->hmac_digest_len = h->hash_digest_len;
#ifdef HAVE_LIBNSS
/* DBG(DBG_CRYPT, DBG_log("NSS: hmac init")); */
SECStatus status;
PK11SymKey *symkey=NULL, *tkey1=NULL;
/* PK11SymKey *tkey1=NULL; */
unsigned int klen;
chunk_t hmac_opad, hmac_ipad, hmac_pad;
memcpy(&symkey, key, key_len);
klen = PK11_GetKeyLength(symkey);
hmac_opad = hmac_pads(HMAC_OPAD,HMAC_BUFSIZE);
hmac_ipad = hmac_pads(HMAC_IPAD,HMAC_BUFSIZE);
hmac_pad = hmac_pads(0x00,HMAC_BUFSIZE-klen);
if(klen > HMAC_BUFSIZE)
{
tkey1 = PK11_Derive_osw(symkey, nss_key_derivation_mech(h)
, NULL, CKM_CONCATENATE_BASE_AND_DATA, CKA_DERIVE, 0);
}
else
{
tkey1 = symkey;
}
PK11SymKey *tkey2 = pk11_derive_wrapper_osw(tkey1, CKM_CONCATENATE_BASE_AND_DATA
, hmac_pad,CKM_XOR_BASE_AND_DATA, CKA_DERIVE, HMAC_BUFSIZE);
PR_ASSERT(tkey2!=NULL);
ctx->ikey = pk11_derive_wrapper_osw(tkey2, CKM_XOR_BASE_AND_DATA
, hmac_ipad,nss_hash_mech(h), CKA_DIGEST, 0);
PR_ASSERT(ctx->ikey !=NULL);
ctx->okey = pk11_derive_wrapper_osw(tkey2, CKM_XOR_BASE_AND_DATA
, hmac_opad,nss_hash_mech(h), CKA_DIGEST, 0);
PR_ASSERT(ctx->okey !=NULL);
if(tkey1!=symkey) {
PK11_FreeSymKey(tkey1);
}
PK11_FreeSymKey(tkey2);
freeanychunk(hmac_opad);
freeanychunk(hmac_ipad);
freeanychunk(hmac_pad);
ctx->ctx_nss = PK11_CreateDigestContext(nss_hash_oid(h));
PR_ASSERT(ctx->ctx_nss!=NULL);
status=PK11_DigestBegin(ctx->ctx_nss);
PR_ASSERT(status==SECSuccess);
status=PK11_DigestKey(ctx->ctx_nss, ctx->ikey);
PR_ASSERT(status==SECSuccess);
#else
/* Prepare the two pads for the HMAC */
memset(ctx->buf1, '\0', HMAC_BUFSIZE);
if (key_len <= HMAC_BUFSIZE)
{
memcpy(ctx->buf1, key, key_len);
}
else
{
h->hash_init(&ctx->hash_ctx);
h->hash_update(&ctx->hash_ctx, key, key_len);
h->hash_final(ctx->buf1, &ctx->hash_ctx);
}
memcpy(ctx->buf2, ctx->buf1, HMAC_BUFSIZE);
for (k = 0; k < HMAC_BUFSIZE; k++)
{
ctx->buf1[k] ^= HMAC_IPAD;
ctx->buf2[k] ^= HMAC_OPAD;
}
hmac_reinit(ctx);
#endif
}