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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <security/cryptoki.h>
#include <sys/crypto/common.h>
#include <des_impl.h>
#include <cryptoutil.h>
#include "softGlobal.h"
#include "softSession.h"
#include "softObject.h"
#include "softDH.h"
#include "softCrypt.h"
/*
* This function takes a converted big integer of the specified attribute
* as an octet string and stores it in the corresponding key object.
*/
static CK_RV
soft_genDHkey_set_attribute(soft_object_t *key, CK_ATTRIBUTE_TYPE type,
uchar_t *buf, uint32_t buflen, boolean_t public)
{
CK_RV rv = CKR_OK;
biginteger_t *dst = NULL;
biginteger_t src;
switch (type) {
case CKA_VALUE:
if (public)
dst = OBJ_PUB_DH_VALUE(key);
else
dst = OBJ_PRI_DH_VALUE(key);
break;
case CKA_PRIME:
dst = OBJ_PRI_DH_PRIME(key);
break;
case CKA_BASE:
dst = OBJ_PRI_DH_BASE(key);
break;
}
if ((rv = dup_bigint_attr(&src, buf, buflen)) != CKR_OK)
goto cleanexit;
/* Copy the attribute in the key object. */
copy_bigint_attr(&src, dst);
cleanexit:
/* No need to free big_value because dst holds it now after copy. */
return (rv);
}
/*
* This function covers the DH Key agreement.
*/
CK_RV
soft_dh_genkey_pair(soft_object_t *pubkey, soft_object_t *prikey)
{
CK_RV rv;
CK_ATTRIBUTE template;
uchar_t prime[MAX_KEY_ATTR_BUFLEN];
uint32_t prime_len = sizeof (prime);
uchar_t base[MAX_KEY_ATTR_BUFLEN];
uint32_t base_len = sizeof (base);
uint32_t value_bits;
uchar_t private_x[MAX_KEY_ATTR_BUFLEN];
uchar_t public_y[MAX_KEY_ATTR_BUFLEN];
DHbytekey k;
if ((pubkey->class != CKO_PUBLIC_KEY) ||
(pubkey->key_type != CKK_DH)) {
return (CKR_KEY_TYPE_INCONSISTENT);
}
if ((prikey->class != CKO_PRIVATE_KEY) ||
(prikey->key_type != CKK_DH)) {
return (CKR_KEY_TYPE_INCONSISTENT);
}
/* Get private-value length in bits */
template.pValue = malloc(sizeof (CK_ULONG));
if (template.pValue == NULL) {
return (CKR_HOST_MEMORY);
}
template.ulValueLen = sizeof (CK_ULONG);
rv = get_ulong_attr_from_object(OBJ_PRI_DH_VAL_BITS(prikey),
&template);
if (rv != CKR_OK) {
free(template.pValue);
return (rv);
}
#ifdef __sparcv9
/* LINTED */
value_bits = (uint32_t)(*((CK_ULONG *)(template.pValue)));
#else /* !__sparcv9 */
value_bits = *((CK_ULONG *)(template.pValue));
#endif /* __sparcv9 */
free(template.pValue);
/*
* The input to the first phase shall be the Diffie-Hellman
* parameters, which include prime, base, and private-value length.
*/
rv = soft_get_public_value(pubkey, CKA_PRIME, prime, &prime_len);
if (rv != CKR_OK) {
return (rv);
}
rv = soft_get_public_value(pubkey, CKA_BASE, base, &base_len);
if (rv != CKR_OK) {
goto ret;
}
/* Inputs to DH key pair generation. */
k.prime = prime;
k.prime_bits = CRYPTO_BYTES2BITS(prime_len);
k.base = base;
k.base_bytes = base_len;
k.value_bits = value_bits;
k.rfunc = (IS_TOKEN_OBJECT(pubkey) || IS_TOKEN_OBJECT(prikey)) ?
pkcs11_get_random : pkcs11_get_urandom;
/* Outputs from DH key pair generation. */
k.private_x = private_x;
k.public_y = public_y;
/* If value_bits is 0, it will return as same size as prime */
if ((rv = dh_genkey_pair(&k)) != CKR_OK) {
goto ret;
}
/*
* The integer public value y shall be converted to an octet
* string PV of length k, the public value.
*/
if ((rv = soft_genDHkey_set_attribute(pubkey, CKA_VALUE, public_y,
prime_len, B_TRUE)) != CKR_OK) {
goto ret;
}
/* Convert the big integer private value to an octet string. */
if ((rv = soft_genDHkey_set_attribute(prikey, CKA_VALUE, private_x,
CRYPTO_BITS2BYTES(k.value_bits), B_FALSE)) != CKR_OK) {
goto ret;
}
/* Convert the big integer prime to an octet string. */
if ((rv = soft_genDHkey_set_attribute(prikey, CKA_PRIME, prime,
CRYPTO_BITS2BYTES(k.prime_bits), B_FALSE)) != CKR_OK) {
goto ret;
}
/* Convert the big integer base to an octet string. */
if ((rv = soft_genDHkey_set_attribute(prikey, CKA_BASE, base,
k.base_bytes, B_FALSE)) != CKR_OK) {
goto ret;
}
/* Update private-value length in bits; could have been 0 before */
OBJ_PRI_DH_VAL_BITS(prikey) = k.value_bits;
ret:
return (rv);
}
/* ARGSUSED3 */
CK_RV
soft_dh_key_derive(soft_object_t *basekey, soft_object_t *secretkey,
void *publicvalue, size_t publicvaluelen)
{
CK_RV rv;
uchar_t privatevalue[MAX_KEY_ATTR_BUFLEN];
uint32_t privatevaluelen = sizeof (privatevalue);
uchar_t privateprime[MAX_KEY_ATTR_BUFLEN];
uint32_t privateprimelen = sizeof (privateprime);
uchar_t key[MAX_KEY_ATTR_BUFLEN];
uint32_t keylen;
DHbytekey k;
rv = soft_get_private_value(basekey, CKA_VALUE, privatevalue,
&privatevaluelen);
if (rv != CKR_OK) {
return (rv);
}
rv = soft_get_private_value(basekey, CKA_PRIME, privateprime,
&privateprimelen);
if (rv != CKR_OK) {
goto ret;
}
/* keylen may be 0 if CKA_VALUE_LEN did not specify */
keylen = OBJ_SEC_VALUE_LEN(secretkey);
if (keylen > sizeof (key)) { /* check for overflow */
rv = CKR_ATTRIBUTE_VALUE_INVALID;
goto ret;
}
k.prime = privateprime;
k.prime_bits = CRYPTO_BYTES2BITS(privateprimelen);
k.value_bits = CRYPTO_BYTES2BITS(privatevaluelen);
k.private_x = privatevalue;
k.public_y = publicvalue;
k.rfunc = NULL;
/* keylen may be modified if it was 0 or conflicts with key type */
rv = dh_key_derive(&k, secretkey->key_type, key, &keylen, 0);
if (rv != CKR_OK) {
goto ret;
}
if ((OBJ_SEC_VALUE(secretkey) = malloc(keylen)) == NULL) {
rv = CKR_HOST_MEMORY;
goto ret;
}
OBJ_SEC_VALUE_LEN(secretkey) = keylen;
(void) memcpy(OBJ_SEC_VALUE(secretkey), key, keylen);
ret:
return (rv);
}
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