438 lines
11 KiB
C
438 lines
11 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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#include <sys/zfs_context.h>
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#include <sys/crypto/icp.h>
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#include <sys/crypto/spi.h>
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#include <modes/modes.h>
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#include <aes/aes_impl.h>
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/*
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* Initialize AES encryption and decryption key schedules.
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*
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* Parameters:
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* cipherKey User key
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* keyBits AES key size (128, 192, or 256 bits)
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* keysched AES key schedule to be initialized, of type aes_key_t.
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* Allocated by aes_alloc_keysched().
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*/
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void
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aes_init_keysched(const uint8_t *cipherKey, uint_t keyBits, void *keysched)
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{
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aes_impl_ops_t *ops = aes_impl_get_ops();
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aes_key_t *newbie = keysched;
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uint_t keysize, i, j;
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union {
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uint64_t ka64[4];
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uint32_t ka32[8];
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} keyarr;
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switch (keyBits) {
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case 128:
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newbie->nr = 10;
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break;
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case 192:
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newbie->nr = 12;
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break;
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case 256:
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newbie->nr = 14;
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break;
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default:
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/* should never get here */
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return;
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}
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keysize = CRYPTO_BITS2BYTES(keyBits);
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/*
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* Generic C implementation requires byteswap for little endian
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* machines, various accelerated implementations for various
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* architectures may not.
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*/
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if (!ops->needs_byteswap) {
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/* no byteswap needed */
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if (IS_P2ALIGNED(cipherKey, sizeof (uint64_t))) {
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for (i = 0, j = 0; j < keysize; i++, j += 8) {
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/* LINTED: pointer alignment */
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keyarr.ka64[i] = *((uint64_t *)&cipherKey[j]);
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}
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} else {
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bcopy(cipherKey, keyarr.ka32, keysize);
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}
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} else {
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/* byte swap */
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for (i = 0, j = 0; j < keysize; i++, j += 4) {
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keyarr.ka32[i] =
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htonl(*(uint32_t *)(void *)&cipherKey[j]);
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}
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}
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ops->generate(newbie, keyarr.ka32, keyBits);
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newbie->ops = ops;
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/*
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* Note: if there are systems that need the AES_64BIT_KS type in the
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* future, move setting key schedule type to individual implementations
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*/
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newbie->type = AES_32BIT_KS;
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}
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/*
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* Encrypt one block using AES.
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* Align if needed and (for x86 32-bit only) byte-swap.
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*
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* Parameters:
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* ks Key schedule, of type aes_key_t
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* pt Input block (plain text)
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* ct Output block (crypto text). Can overlap with pt
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*/
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int
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aes_encrypt_block(const void *ks, const uint8_t *pt, uint8_t *ct)
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{
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aes_key_t *ksch = (aes_key_t *)ks;
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const aes_impl_ops_t *ops = ksch->ops;
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if (IS_P2ALIGNED2(pt, ct, sizeof (uint32_t)) && !ops->needs_byteswap) {
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/* LINTED: pointer alignment */
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ops->encrypt(&ksch->encr_ks.ks32[0], ksch->nr,
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/* LINTED: pointer alignment */
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(uint32_t *)pt, (uint32_t *)ct);
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} else {
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uint32_t buffer[AES_BLOCK_LEN / sizeof (uint32_t)];
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/* Copy input block into buffer */
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if (ops->needs_byteswap) {
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buffer[0] = htonl(*(uint32_t *)(void *)&pt[0]);
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buffer[1] = htonl(*(uint32_t *)(void *)&pt[4]);
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buffer[2] = htonl(*(uint32_t *)(void *)&pt[8]);
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buffer[3] = htonl(*(uint32_t *)(void *)&pt[12]);
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} else
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bcopy(pt, &buffer, AES_BLOCK_LEN);
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ops->encrypt(&ksch->encr_ks.ks32[0], ksch->nr, buffer, buffer);
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/* Copy result from buffer to output block */
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if (ops->needs_byteswap) {
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*(uint32_t *)(void *)&ct[0] = htonl(buffer[0]);
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*(uint32_t *)(void *)&ct[4] = htonl(buffer[1]);
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*(uint32_t *)(void *)&ct[8] = htonl(buffer[2]);
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*(uint32_t *)(void *)&ct[12] = htonl(buffer[3]);
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} else
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bcopy(&buffer, ct, AES_BLOCK_LEN);
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}
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return (CRYPTO_SUCCESS);
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}
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/*
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* Decrypt one block using AES.
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* Align and byte-swap if needed.
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*
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* Parameters:
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* ks Key schedule, of type aes_key_t
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* ct Input block (crypto text)
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* pt Output block (plain text). Can overlap with pt
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*/
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int
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aes_decrypt_block(const void *ks, const uint8_t *ct, uint8_t *pt)
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{
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aes_key_t *ksch = (aes_key_t *)ks;
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const aes_impl_ops_t *ops = ksch->ops;
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if (IS_P2ALIGNED2(ct, pt, sizeof (uint32_t)) && !ops->needs_byteswap) {
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/* LINTED: pointer alignment */
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ops->decrypt(&ksch->decr_ks.ks32[0], ksch->nr,
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/* LINTED: pointer alignment */
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(uint32_t *)ct, (uint32_t *)pt);
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} else {
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uint32_t buffer[AES_BLOCK_LEN / sizeof (uint32_t)];
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/* Copy input block into buffer */
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if (ops->needs_byteswap) {
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buffer[0] = htonl(*(uint32_t *)(void *)&ct[0]);
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buffer[1] = htonl(*(uint32_t *)(void *)&ct[4]);
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buffer[2] = htonl(*(uint32_t *)(void *)&ct[8]);
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buffer[3] = htonl(*(uint32_t *)(void *)&ct[12]);
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} else
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bcopy(ct, &buffer, AES_BLOCK_LEN);
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ops->decrypt(&ksch->decr_ks.ks32[0], ksch->nr, buffer, buffer);
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/* Copy result from buffer to output block */
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if (ops->needs_byteswap) {
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*(uint32_t *)(void *)&pt[0] = htonl(buffer[0]);
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*(uint32_t *)(void *)&pt[4] = htonl(buffer[1]);
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*(uint32_t *)(void *)&pt[8] = htonl(buffer[2]);
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*(uint32_t *)(void *)&pt[12] = htonl(buffer[3]);
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} else
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bcopy(&buffer, pt, AES_BLOCK_LEN);
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}
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return (CRYPTO_SUCCESS);
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}
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/*
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* Allocate key schedule for AES.
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*
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* Return the pointer and set size to the number of bytes allocated.
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* Memory allocated must be freed by the caller when done.
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*
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* Parameters:
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* size Size of key schedule allocated, in bytes
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* kmflag Flag passed to kmem_alloc(9F); ignored in userland.
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*/
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/* ARGSUSED */
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void *
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aes_alloc_keysched(size_t *size, int kmflag)
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{
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aes_key_t *keysched;
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keysched = (aes_key_t *)kmem_alloc(sizeof (aes_key_t), kmflag);
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if (keysched != NULL) {
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*size = sizeof (aes_key_t);
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return (keysched);
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}
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return (NULL);
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}
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/* AES implementation that contains the fastest methods */
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static aes_impl_ops_t aes_fastest_impl = {
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.name = "fastest"
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};
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/* All compiled in implementations */
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const aes_impl_ops_t *aes_all_impl[] = {
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&aes_generic_impl,
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#if defined(__x86_64)
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&aes_x86_64_impl,
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#endif
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#if defined(__x86_64) && defined(HAVE_AES)
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&aes_aesni_impl,
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#endif
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};
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/* Indicate that benchmark has been completed */
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static boolean_t aes_impl_initialized = B_FALSE;
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/* Select aes implementation */
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#define IMPL_FASTEST (UINT32_MAX)
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#define IMPL_CYCLE (UINT32_MAX-1)
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#define AES_IMPL_READ(i) (*(volatile uint32_t *) &(i))
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static uint32_t icp_aes_impl = IMPL_FASTEST;
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static uint32_t user_sel_impl = IMPL_FASTEST;
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/* Hold all supported implementations */
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static size_t aes_supp_impl_cnt = 0;
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static aes_impl_ops_t *aes_supp_impl[ARRAY_SIZE(aes_all_impl)];
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/*
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* Selects the aes operations for encrypt/decrypt/key setup
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*/
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aes_impl_ops_t *
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aes_impl_get_ops()
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{
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aes_impl_ops_t *ops = NULL;
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const uint32_t impl = AES_IMPL_READ(icp_aes_impl);
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switch (impl) {
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case IMPL_FASTEST:
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ASSERT(aes_impl_initialized);
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ops = &aes_fastest_impl;
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break;
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case IMPL_CYCLE:
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{
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ASSERT(aes_impl_initialized);
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ASSERT3U(aes_supp_impl_cnt, >, 0);
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/* Cycle through supported implementations */
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static size_t cycle_impl_idx = 0;
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size_t idx = (++cycle_impl_idx) % aes_supp_impl_cnt;
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ops = aes_supp_impl[idx];
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}
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break;
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default:
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ASSERT3U(impl, <, aes_supp_impl_cnt);
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ASSERT3U(aes_supp_impl_cnt, >, 0);
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if (impl < ARRAY_SIZE(aes_all_impl))
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ops = aes_supp_impl[impl];
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break;
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}
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ASSERT3P(ops, !=, NULL);
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return (ops);
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}
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void
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aes_impl_init(void)
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{
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aes_impl_ops_t *curr_impl;
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int i, c;
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/* move supported impl into aes_supp_impls */
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for (i = 0, c = 0; i < ARRAY_SIZE(aes_all_impl); i++) {
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curr_impl = (aes_impl_ops_t *)aes_all_impl[i];
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if (curr_impl->is_supported())
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aes_supp_impl[c++] = (aes_impl_ops_t *)curr_impl;
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}
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aes_supp_impl_cnt = c;
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/*
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* Set the fastest implementation given the assumption that the
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* hardware accelerated version is the fastest.
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*/
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#if defined(__x86_64)
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#if defined(HAVE_AES)
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if (aes_aesni_impl.is_supported()) {
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memcpy(&aes_fastest_impl, &aes_aesni_impl,
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sizeof (aes_fastest_impl));
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} else
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#endif
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{
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memcpy(&aes_fastest_impl, &aes_x86_64_impl,
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sizeof (aes_fastest_impl));
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}
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#else
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memcpy(&aes_fastest_impl, &aes_generic_impl,
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sizeof (aes_fastest_impl));
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#endif
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strcpy(aes_fastest_impl.name, "fastest");
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/* Finish initialization */
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atomic_swap_32(&icp_aes_impl, user_sel_impl);
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aes_impl_initialized = B_TRUE;
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}
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static const struct {
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char *name;
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uint32_t sel;
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} aes_impl_opts[] = {
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{ "cycle", IMPL_CYCLE },
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{ "fastest", IMPL_FASTEST },
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};
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/*
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* Function sets desired aes implementation.
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*
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* If we are called before init(), user preference will be saved in
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* user_sel_impl, and applied in later init() call. This occurs when module
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* parameter is specified on module load. Otherwise, directly update
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* icp_aes_impl.
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*
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* @val Name of aes implementation to use
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* @param Unused.
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*/
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int
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aes_impl_set(const char *val)
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{
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int err = -EINVAL;
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char req_name[AES_IMPL_NAME_MAX];
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uint32_t impl = AES_IMPL_READ(user_sel_impl);
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size_t i;
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/* sanitize input */
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i = strnlen(val, AES_IMPL_NAME_MAX);
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if (i == 0 || i >= AES_IMPL_NAME_MAX)
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return (err);
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strlcpy(req_name, val, AES_IMPL_NAME_MAX);
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while (i > 0 && isspace(req_name[i-1]))
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i--;
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req_name[i] = '\0';
|
||
|
|
|
||
|
|
/* Check mandatory options */
|
||
|
|
for (i = 0; i < ARRAY_SIZE(aes_impl_opts); i++) {
|
||
|
|
if (strcmp(req_name, aes_impl_opts[i].name) == 0) {
|
||
|
|
impl = aes_impl_opts[i].sel;
|
||
|
|
err = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* check all supported impl if init() was already called */
|
||
|
|
if (err != 0 && aes_impl_initialized) {
|
||
|
|
/* check all supported implementations */
|
||
|
|
for (i = 0; i < aes_supp_impl_cnt; i++) {
|
||
|
|
if (strcmp(req_name, aes_supp_impl[i]->name) == 0) {
|
||
|
|
impl = i;
|
||
|
|
err = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (err == 0) {
|
||
|
|
if (aes_impl_initialized)
|
||
|
|
atomic_swap_32(&icp_aes_impl, impl);
|
||
|
|
else
|
||
|
|
atomic_swap_32(&user_sel_impl, impl);
|
||
|
|
}
|
||
|
|
|
||
|
|
return (err);
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined(_KERNEL)
|
||
|
|
#include <linux/mod_compat.h>
|
||
|
|
|
||
|
|
static int
|
||
|
|
icp_aes_impl_set(const char *val, zfs_kernel_param_t *kp)
|
||
|
|
{
|
||
|
|
return (aes_impl_set(val));
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
icp_aes_impl_get(char *buffer, zfs_kernel_param_t *kp)
|
||
|
|
{
|
||
|
|
int i, cnt = 0;
|
||
|
|
char *fmt;
|
||
|
|
const uint32_t impl = AES_IMPL_READ(icp_aes_impl);
|
||
|
|
|
||
|
|
ASSERT(aes_impl_initialized);
|
||
|
|
|
||
|
|
/* list mandatory options */
|
||
|
|
for (i = 0; i < ARRAY_SIZE(aes_impl_opts); i++) {
|
||
|
|
fmt = (impl == aes_impl_opts[i].sel) ? "[%s] " : "%s ";
|
||
|
|
cnt += sprintf(buffer + cnt, fmt, aes_impl_opts[i].name);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* list all supported implementations */
|
||
|
|
for (i = 0; i < aes_supp_impl_cnt; i++) {
|
||
|
|
fmt = (i == impl) ? "[%s] " : "%s ";
|
||
|
|
cnt += sprintf(buffer + cnt, fmt, aes_supp_impl[i]->name);
|
||
|
|
}
|
||
|
|
|
||
|
|
return (cnt);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_param_call(icp_aes_impl, icp_aes_impl_set, icp_aes_impl_get,
|
||
|
|
NULL, 0644);
|
||
|
|
MODULE_PARM_DESC(icp_aes_impl, "Select aes implementation.");
|
||
|
|
#endif
|