These bzero's should have been explicit_bzero's. Reviewed by: cem, delphij Sponsored by: Chelsio Communications Differential Revision: https://reviews.freebsd.org/D25437
426 lines
11 KiB
C
426 lines
11 KiB
C
/*-
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* Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/libkern.h>
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#include <sys/endian.h>
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#include <sys/pcpu.h>
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#if defined(__amd64__) || defined(__i386__)
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#include <machine/cpufunc.h>
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#include <machine/cputypes.h>
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#include <machine/md_var.h>
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#include <machine/specialreg.h>
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#endif
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#include <machine/pcb.h>
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#include <opencrypto/cryptodev.h>
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#include <opencrypto/xform.h>
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#include <crypto/via/padlock.h>
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/*
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* Implementation notes.
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*
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* Some VIA CPUs provides SHA1 and SHA256 acceleration.
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* We implement all HMAC algorithms provided by crypto(9) framework, but we do
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* the crypto work in software unless this is HMAC/SHA1 or HMAC/SHA256 and
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* our CPU can accelerate it.
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*
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* Additional CPU instructions, which preform SHA1 and SHA256 are one-shot
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* functions - we have only one chance to give the data, CPU itself will add
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* the padding and calculate hash automatically.
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* This means, it is not possible to implement common init(), update(), final()
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* methods.
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* The way I've choosen is to keep adding data to the buffer on update()
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* (reallocating the buffer if necessary) and call XSHA{1,256} instruction on
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* final().
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*/
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struct padlock_sha_ctx {
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uint8_t *psc_buf;
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int psc_offset;
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int psc_size;
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};
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CTASSERT(sizeof(struct padlock_sha_ctx) <= sizeof(union authctx));
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static void padlock_sha_init(void *vctx);
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static int padlock_sha_update(void *vctx, const void *buf, u_int bufsize);
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static void padlock_sha1_final(uint8_t *hash, void *vctx);
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static void padlock_sha256_final(uint8_t *hash, void *vctx);
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static struct auth_hash padlock_hmac_sha1 = {
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.type = CRYPTO_SHA1_HMAC,
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.name = "HMAC-SHA1",
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.keysize = SHA1_BLOCK_LEN,
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.hashsize = SHA1_HASH_LEN,
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.ctxsize = sizeof(struct padlock_sha_ctx),
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.blocksize = SHA1_BLOCK_LEN,
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.Init = padlock_sha_init,
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.Update = padlock_sha_update,
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.Final = padlock_sha1_final,
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};
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static struct auth_hash padlock_hmac_sha256 = {
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.type = CRYPTO_SHA2_256_HMAC,
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.name = "HMAC-SHA2-256",
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.keysize = SHA2_256_BLOCK_LEN,
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.hashsize = SHA2_256_HASH_LEN,
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.ctxsize = sizeof(struct padlock_sha_ctx),
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.blocksize = SHA2_256_BLOCK_LEN,
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.Init = padlock_sha_init,
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.Update = padlock_sha_update,
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.Final = padlock_sha256_final,
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};
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MALLOC_DECLARE(M_PADLOCK);
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static __inline void
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padlock_output_block(uint32_t *src, uint32_t *dst, size_t count)
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{
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while (count-- > 0)
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*dst++ = bswap32(*src++);
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}
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static void
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padlock_do_sha1(const u_char *in, u_char *out, int count)
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{
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u_char buf[128+16]; /* PadLock needs at least 128 bytes buffer. */
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u_char *result = PADLOCK_ALIGN(buf);
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((uint32_t *)result)[0] = 0x67452301;
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((uint32_t *)result)[1] = 0xEFCDAB89;
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((uint32_t *)result)[2] = 0x98BADCFE;
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((uint32_t *)result)[3] = 0x10325476;
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((uint32_t *)result)[4] = 0xC3D2E1F0;
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#ifdef __GNUCLIKE_ASM
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__asm __volatile(
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".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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);
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#endif
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padlock_output_block((uint32_t *)result, (uint32_t *)out,
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SHA1_HASH_LEN / sizeof(uint32_t));
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}
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static void
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padlock_do_sha256(const char *in, char *out, int count)
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{
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char buf[128+16]; /* PadLock needs at least 128 bytes buffer. */
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char *result = PADLOCK_ALIGN(buf);
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((uint32_t *)result)[0] = 0x6A09E667;
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((uint32_t *)result)[1] = 0xBB67AE85;
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((uint32_t *)result)[2] = 0x3C6EF372;
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((uint32_t *)result)[3] = 0xA54FF53A;
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((uint32_t *)result)[4] = 0x510E527F;
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((uint32_t *)result)[5] = 0x9B05688C;
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((uint32_t *)result)[6] = 0x1F83D9AB;
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((uint32_t *)result)[7] = 0x5BE0CD19;
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#ifdef __GNUCLIKE_ASM
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__asm __volatile(
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".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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);
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#endif
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padlock_output_block((uint32_t *)result, (uint32_t *)out,
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SHA2_256_HASH_LEN / sizeof(uint32_t));
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}
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static void
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padlock_sha_init(void *vctx)
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{
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struct padlock_sha_ctx *ctx;
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ctx = vctx;
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ctx->psc_buf = NULL;
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ctx->psc_offset = 0;
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ctx->psc_size = 0;
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}
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static int
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padlock_sha_update(void *vctx, const void *buf, u_int bufsize)
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{
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struct padlock_sha_ctx *ctx;
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ctx = vctx;
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if (ctx->psc_size - ctx->psc_offset < bufsize) {
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ctx->psc_size = MAX(ctx->psc_size * 2, ctx->psc_size + bufsize);
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ctx->psc_buf = realloc(ctx->psc_buf, ctx->psc_size, M_PADLOCK,
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M_NOWAIT);
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if(ctx->psc_buf == NULL)
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return (ENOMEM);
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}
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bcopy(buf, ctx->psc_buf + ctx->psc_offset, bufsize);
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ctx->psc_offset += bufsize;
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return (0);
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}
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static void
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padlock_sha_free(void *vctx)
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{
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struct padlock_sha_ctx *ctx;
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ctx = vctx;
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if (ctx->psc_buf != NULL) {
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zfree(ctx->psc_buf, M_PADLOCK);
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ctx->psc_buf = NULL;
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ctx->psc_offset = 0;
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ctx->psc_size = 0;
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}
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}
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static void
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padlock_sha1_final(uint8_t *hash, void *vctx)
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{
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struct padlock_sha_ctx *ctx;
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ctx = vctx;
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padlock_do_sha1(ctx->psc_buf, hash, ctx->psc_offset);
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padlock_sha_free(ctx);
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}
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static void
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padlock_sha256_final(uint8_t *hash, void *vctx)
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{
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struct padlock_sha_ctx *ctx;
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ctx = vctx;
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padlock_do_sha256(ctx->psc_buf, hash, ctx->psc_offset);
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padlock_sha_free(ctx);
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}
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static void
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padlock_copy_ctx(struct auth_hash *axf, void *sctx, void *dctx)
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{
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if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
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(axf->type == CRYPTO_SHA1_HMAC ||
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axf->type == CRYPTO_SHA2_256_HMAC)) {
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struct padlock_sha_ctx *spctx = sctx, *dpctx = dctx;
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dpctx->psc_offset = spctx->psc_offset;
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dpctx->psc_size = spctx->psc_size;
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dpctx->psc_buf = malloc(dpctx->psc_size, M_PADLOCK, M_WAITOK);
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bcopy(spctx->psc_buf, dpctx->psc_buf, dpctx->psc_size);
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} else {
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bcopy(sctx, dctx, axf->ctxsize);
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}
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}
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static void
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padlock_free_ctx(struct auth_hash *axf, void *ctx)
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{
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if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
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(axf->type == CRYPTO_SHA1_HMAC ||
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axf->type == CRYPTO_SHA2_256_HMAC)) {
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padlock_sha_free(ctx);
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}
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}
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static void
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padlock_hash_key_setup(struct padlock_session *ses, const uint8_t *key,
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int klen)
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{
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struct auth_hash *axf;
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axf = ses->ses_axf;
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/*
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* Try to free contexts before using them, because
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* padlock_hash_key_setup() can be called twice - once from
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* padlock_newsession() and again from padlock_process().
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*/
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padlock_free_ctx(axf, ses->ses_ictx);
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padlock_free_ctx(axf, ses->ses_octx);
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hmac_init_ipad(axf, key, klen, ses->ses_ictx);
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hmac_init_opad(axf, key, klen, ses->ses_octx);
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}
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/*
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* Compute keyed-hash authenticator.
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*/
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static int
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padlock_authcompute(struct padlock_session *ses, struct cryptop *crp)
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{
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u_char hash[HASH_MAX_LEN], hash2[HASH_MAX_LEN];
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struct auth_hash *axf;
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union authctx ctx;
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int error;
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axf = ses->ses_axf;
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padlock_copy_ctx(axf, ses->ses_ictx, &ctx);
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error = crypto_apply(crp, crp->crp_aad_start, crp->crp_aad_length,
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axf->Update, &ctx);
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if (error != 0) {
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padlock_free_ctx(axf, &ctx);
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return (error);
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}
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error = crypto_apply(crp, crp->crp_payload_start,
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crp->crp_payload_length, axf->Update, &ctx);
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if (error != 0) {
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padlock_free_ctx(axf, &ctx);
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return (error);
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}
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axf->Final(hash, &ctx);
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padlock_copy_ctx(axf, ses->ses_octx, &ctx);
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axf->Update(&ctx, hash, axf->hashsize);
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axf->Final(hash, &ctx);
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if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
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crypto_copydata(crp, crp->crp_digest_start, ses->ses_mlen,
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hash2);
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if (timingsafe_bcmp(hash, hash2, ses->ses_mlen) != 0)
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return (EBADMSG);
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} else
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crypto_copyback(crp, crp->crp_digest_start, ses->ses_mlen,
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hash);
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return (0);
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}
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/* Find software structure which describes HMAC algorithm. */
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static struct auth_hash *
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padlock_hash_lookup(int alg)
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{
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struct auth_hash *axf;
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switch (alg) {
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case CRYPTO_NULL_HMAC:
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axf = &auth_hash_null;
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break;
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case CRYPTO_SHA1_HMAC:
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if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
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axf = &padlock_hmac_sha1;
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else
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axf = &auth_hash_hmac_sha1;
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break;
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case CRYPTO_RIPEMD160_HMAC:
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axf = &auth_hash_hmac_ripemd_160;
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break;
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case CRYPTO_SHA2_256_HMAC:
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if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
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axf = &padlock_hmac_sha256;
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else
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axf = &auth_hash_hmac_sha2_256;
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break;
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case CRYPTO_SHA2_384_HMAC:
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axf = &auth_hash_hmac_sha2_384;
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break;
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case CRYPTO_SHA2_512_HMAC:
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axf = &auth_hash_hmac_sha2_512;
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break;
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default:
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axf = NULL;
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break;
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}
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return (axf);
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}
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bool
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padlock_hash_check(const struct crypto_session_params *csp)
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{
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return (padlock_hash_lookup(csp->csp_auth_alg) != NULL);
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}
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int
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padlock_hash_setup(struct padlock_session *ses,
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const struct crypto_session_params *csp)
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{
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ses->ses_axf = padlock_hash_lookup(csp->csp_auth_alg);
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if (csp->csp_auth_mlen == 0)
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ses->ses_mlen = ses->ses_axf->hashsize;
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else
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ses->ses_mlen = csp->csp_auth_mlen;
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/* Allocate memory for HMAC inner and outer contexts. */
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ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
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M_ZERO | M_NOWAIT);
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ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
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M_ZERO | M_NOWAIT);
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if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
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return (ENOMEM);
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/* Setup key if given. */
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if (csp->csp_auth_key != NULL) {
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padlock_hash_key_setup(ses, csp->csp_auth_key,
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csp->csp_auth_klen);
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}
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return (0);
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}
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int
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padlock_hash_process(struct padlock_session *ses, struct cryptop *crp,
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const struct crypto_session_params *csp)
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{
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struct thread *td;
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int error;
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td = curthread;
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fpu_kern_enter(td, ses->ses_fpu_ctx, FPU_KERN_NORMAL | FPU_KERN_KTHR);
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if (crp->crp_auth_key != NULL)
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padlock_hash_key_setup(ses, crp->crp_auth_key,
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csp->csp_auth_klen);
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error = padlock_authcompute(ses, crp);
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fpu_kern_leave(td, ses->ses_fpu_ctx);
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return (error);
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}
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void
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padlock_hash_free(struct padlock_session *ses)
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{
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if (ses->ses_ictx != NULL) {
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padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
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zfree(ses->ses_ictx, M_PADLOCK);
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ses->ses_ictx = NULL;
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}
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if (ses->ses_octx != NULL) {
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padlock_free_ctx(ses->ses_axf, ses->ses_octx);
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zfree(ses->ses_octx, M_PADLOCK);
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ses->ses_octx = NULL;
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}
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}
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