302 lines
7.6 KiB
C
302 lines
7.6 KiB
C
/*
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* Cryptographic API.
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*
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* Support for VIA PadLock hardware crypto engine.
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*
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* Copyright (c) 2006 Michal Ludvig <michal@logix.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <crypto/algapi.h>
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#include <crypto/sha.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/cryptohash.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/scatterlist.h>
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#include "padlock.h"
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#define SHA1_DEFAULT_FALLBACK "sha1-generic"
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#define SHA256_DEFAULT_FALLBACK "sha256-generic"
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struct padlock_sha_ctx {
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char *data;
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size_t used;
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int bypass;
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void (*f_sha_padlock)(const char *in, char *out, int count);
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struct hash_desc fallback;
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};
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static inline struct padlock_sha_ctx *ctx(struct crypto_tfm *tfm)
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{
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return crypto_tfm_ctx(tfm);
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}
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/* We'll need aligned address on the stack */
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#define NEAREST_ALIGNED(ptr) \
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((void *)ALIGN((size_t)(ptr), PADLOCK_ALIGNMENT))
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static struct crypto_alg sha1_alg, sha256_alg;
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static void padlock_sha_bypass(struct crypto_tfm *tfm)
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{
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if (ctx(tfm)->bypass)
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return;
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crypto_hash_init(&ctx(tfm)->fallback);
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if (ctx(tfm)->data && ctx(tfm)->used) {
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struct scatterlist sg;
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sg_set_buf(&sg, ctx(tfm)->data, ctx(tfm)->used);
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crypto_hash_update(&ctx(tfm)->fallback, &sg, sg.length);
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}
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ctx(tfm)->used = 0;
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ctx(tfm)->bypass = 1;
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}
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static void padlock_sha_init(struct crypto_tfm *tfm)
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{
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ctx(tfm)->used = 0;
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ctx(tfm)->bypass = 0;
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}
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static void padlock_sha_update(struct crypto_tfm *tfm,
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const uint8_t *data, unsigned int length)
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{
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/* Our buffer is always one page. */
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if (unlikely(!ctx(tfm)->bypass &&
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(ctx(tfm)->used + length > PAGE_SIZE)))
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padlock_sha_bypass(tfm);
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if (unlikely(ctx(tfm)->bypass)) {
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struct scatterlist sg;
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sg_set_buf(&sg, (uint8_t *)data, length);
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crypto_hash_update(&ctx(tfm)->fallback, &sg, length);
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return;
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}
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memcpy(ctx(tfm)->data + ctx(tfm)->used, data, length);
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ctx(tfm)->used += length;
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}
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static inline void padlock_output_block(uint32_t *src,
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uint32_t *dst, size_t count)
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{
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while (count--)
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*dst++ = swab32(*src++);
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}
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static void padlock_do_sha1(const char *in, char *out, int count)
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{
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/* We can't store directly to *out as it may be unaligned. */
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/* BTW Don't reduce the buffer size below 128 Bytes!
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* PadLock microcode needs it that big. */
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char buf[128+16];
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char *result = NEAREST_ALIGNED(buf);
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((uint32_t *)result)[0] = SHA1_H0;
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((uint32_t *)result)[1] = SHA1_H1;
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((uint32_t *)result)[2] = SHA1_H2;
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((uint32_t *)result)[3] = SHA1_H3;
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((uint32_t *)result)[4] = SHA1_H4;
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asm volatile (".byte 0xf3,0x0f,0xa6,0xc8" /* rep xsha1 */
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: "+S"(in), "+D"(result)
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: "c"(count), "a"(0));
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padlock_output_block((uint32_t *)result, (uint32_t *)out, 5);
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}
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static void padlock_do_sha256(const char *in, char *out, int count)
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{
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/* We can't store directly to *out as it may be unaligned. */
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/* BTW Don't reduce the buffer size below 128 Bytes!
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* PadLock microcode needs it that big. */
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char buf[128+16];
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char *result = NEAREST_ALIGNED(buf);
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((uint32_t *)result)[0] = SHA256_H0;
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((uint32_t *)result)[1] = SHA256_H1;
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((uint32_t *)result)[2] = SHA256_H2;
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((uint32_t *)result)[3] = SHA256_H3;
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((uint32_t *)result)[4] = SHA256_H4;
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((uint32_t *)result)[5] = SHA256_H5;
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((uint32_t *)result)[6] = SHA256_H6;
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((uint32_t *)result)[7] = SHA256_H7;
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asm volatile (".byte 0xf3,0x0f,0xa6,0xd0" /* rep xsha256 */
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: "+S"(in), "+D"(result)
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: "c"(count), "a"(0));
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padlock_output_block((uint32_t *)result, (uint32_t *)out, 8);
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}
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static void padlock_sha_final(struct crypto_tfm *tfm, uint8_t *out)
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{
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if (unlikely(ctx(tfm)->bypass)) {
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crypto_hash_final(&ctx(tfm)->fallback, out);
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ctx(tfm)->bypass = 0;
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return;
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}
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/* Pass the input buffer to PadLock microcode... */
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ctx(tfm)->f_sha_padlock(ctx(tfm)->data, out, ctx(tfm)->used);
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ctx(tfm)->used = 0;
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}
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static int padlock_cra_init(struct crypto_tfm *tfm)
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{
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const char *fallback_driver_name = tfm->__crt_alg->cra_name;
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struct crypto_hash *fallback_tfm;
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/* For now we'll allocate one page. This
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* could eventually be configurable one day. */
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ctx(tfm)->data = (char *)__get_free_page(GFP_KERNEL);
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if (!ctx(tfm)->data)
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return -ENOMEM;
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/* Allocate a fallback and abort if it failed. */
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fallback_tfm = crypto_alloc_hash(fallback_driver_name, 0,
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CRYPTO_ALG_ASYNC |
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CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(fallback_tfm)) {
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printk(KERN_WARNING PFX "Fallback driver '%s' could not be loaded!\n",
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fallback_driver_name);
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free_page((unsigned long)(ctx(tfm)->data));
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return PTR_ERR(fallback_tfm);
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}
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ctx(tfm)->fallback.tfm = fallback_tfm;
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return 0;
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}
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static int padlock_sha1_cra_init(struct crypto_tfm *tfm)
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{
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ctx(tfm)->f_sha_padlock = padlock_do_sha1;
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return padlock_cra_init(tfm);
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}
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static int padlock_sha256_cra_init(struct crypto_tfm *tfm)
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{
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ctx(tfm)->f_sha_padlock = padlock_do_sha256;
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return padlock_cra_init(tfm);
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}
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static void padlock_cra_exit(struct crypto_tfm *tfm)
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{
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if (ctx(tfm)->data) {
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free_page((unsigned long)(ctx(tfm)->data));
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ctx(tfm)->data = NULL;
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}
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crypto_free_hash(ctx(tfm)->fallback.tfm);
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ctx(tfm)->fallback.tfm = NULL;
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}
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static struct crypto_alg sha1_alg = {
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.cra_name = "sha1",
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.cra_driver_name = "sha1-padlock",
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.cra_priority = PADLOCK_CRA_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = SHA1_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct padlock_sha_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(sha1_alg.cra_list),
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.cra_init = padlock_sha1_cra_init,
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.cra_exit = padlock_cra_exit,
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.cra_u = {
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.digest = {
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.dia_digestsize = SHA1_DIGEST_SIZE,
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.dia_init = padlock_sha_init,
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.dia_update = padlock_sha_update,
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.dia_final = padlock_sha_final,
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}
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}
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};
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static struct crypto_alg sha256_alg = {
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.cra_name = "sha256",
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.cra_driver_name = "sha256-padlock",
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.cra_priority = PADLOCK_CRA_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = SHA256_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct padlock_sha_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(sha256_alg.cra_list),
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.cra_init = padlock_sha256_cra_init,
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.cra_exit = padlock_cra_exit,
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.cra_u = {
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.digest = {
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.dia_digestsize = SHA256_DIGEST_SIZE,
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.dia_init = padlock_sha_init,
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.dia_update = padlock_sha_update,
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.dia_final = padlock_sha_final,
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}
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}
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};
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static int __init padlock_init(void)
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{
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int rc = -ENODEV;
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if (!cpu_has_phe) {
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printk(KERN_ERR PFX "VIA PadLock Hash Engine not detected.\n");
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return -ENODEV;
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}
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if (!cpu_has_phe_enabled) {
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printk(KERN_ERR PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
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return -ENODEV;
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}
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rc = crypto_register_alg(&sha1_alg);
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if (rc)
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goto out;
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rc = crypto_register_alg(&sha256_alg);
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if (rc)
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goto out_unreg1;
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printk(KERN_NOTICE PFX "Using VIA PadLock ACE for SHA1/SHA256 algorithms.\n");
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return 0;
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out_unreg1:
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crypto_unregister_alg(&sha1_alg);
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out:
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printk(KERN_ERR PFX "VIA PadLock SHA1/SHA256 initialization failed.\n");
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return rc;
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}
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static void __exit padlock_fini(void)
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{
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crypto_unregister_alg(&sha1_alg);
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crypto_unregister_alg(&sha256_alg);
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}
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module_init(padlock_init);
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module_exit(padlock_fini);
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MODULE_DESCRIPTION("VIA PadLock SHA1/SHA256 algorithms support.");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Michal Ludvig");
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MODULE_ALIAS("sha1");
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MODULE_ALIAS("sha256");
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MODULE_ALIAS("sha1-padlock");
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MODULE_ALIAS("sha256-padlock");
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