padlock_hash.c

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    1 /*-
    2  * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/malloc.h>
   35 #include <sys/libkern.h>
   36 #include <sys/endian.h>
   37 #include <sys/pcpu.h>
   38 #if defined(__amd64__) || defined(__i386__)
   39 #include <machine/cpufunc.h>
   40 #include <machine/cputypes.h>
   41 #include <machine/md_var.h>
   42 #include <machine/specialreg.h>
   43 #endif
   44 #include <machine/pcb.h>
   45 
   46 #include <opencrypto/cryptodev.h>
   47 #include <opencrypto/xform.h>
   48 
   49 #include <crypto/via/padlock.h>
   50 
   51 /*
   52  * Implementation notes.
   53  *
   54  * Some VIA CPUs provides SHA1 and SHA256 acceleration.
   55  * We implement all HMAC algorithms provided by crypto(9) framework, but we do
   56  * the crypto work in software unless this is HMAC/SHA1 or HMAC/SHA256 and
   57  * our CPU can accelerate it.
   58  *
   59  * Additional CPU instructions, which preform SHA1 and SHA256 are one-shot
   60  * functions - we have only one chance to give the data, CPU itself will add
   61  * the padding and calculate hash automatically.
   62  * This means, it is not possible to implement common init(), update(), final()
   63  * methods.
   64  * The way I've choosen is to keep adding data to the buffer on update()
   65  * (reallocating the buffer if necessary) and call XSHA{1,256} instruction on
   66  * final().
   67  */
   68 
   69 struct padlock_sha_ctx {
   70         uint8_t *psc_buf;
   71         int      psc_offset;
   72         int      psc_size;
   73 };
   74 CTASSERT(sizeof(struct padlock_sha_ctx) <= sizeof(union authctx));
   75 
   76 static void padlock_sha_init(void *vctx);
   77 static int padlock_sha_update(void *vctx, const void *buf, u_int bufsize);
   78 static void padlock_sha1_final(uint8_t *hash, void *vctx);
   79 static void padlock_sha256_final(uint8_t *hash, void *vctx);
   80 
   81 static const struct auth_hash padlock_hmac_sha1 = {
   82         .type = CRYPTO_SHA1_HMAC,
   83         .name = "HMAC-SHA1",
   84         .keysize = SHA1_BLOCK_LEN,
   85         .hashsize = SHA1_HASH_LEN,
   86         .ctxsize = sizeof(struct padlock_sha_ctx),
   87         .blocksize = SHA1_BLOCK_LEN,
   88         .Init = padlock_sha_init,
   89         .Update = padlock_sha_update,
   90         .Final = padlock_sha1_final,
   91 };
   92 
   93 static const struct auth_hash padlock_hmac_sha256 = {
   94         .type = CRYPTO_SHA2_256_HMAC,
   95         .name = "HMAC-SHA2-256",
   96         .keysize = SHA2_256_BLOCK_LEN,
   97         .hashsize = SHA2_256_HASH_LEN,
   98         .ctxsize = sizeof(struct padlock_sha_ctx),
   99         .blocksize = SHA2_256_BLOCK_LEN,
  100         .Init = padlock_sha_init,
  101         .Update = padlock_sha_update,
  102         .Final = padlock_sha256_final,
  103 };
  104 
  105 MALLOC_DECLARE(M_PADLOCK);
  106 
  107 static __inline void
  108 padlock_output_block(uint32_t *src, uint32_t *dst, size_t count)
  109 {
  110 
  111         while (count-- > 0)
  112                 *dst++ = bswap32(*src++);
  113 }
  114 
  115 static void
  116 padlock_do_sha1(const u_char *in, u_char *out, int count)
  117 {
  118         u_char buf[128+16];     /* PadLock needs at least 128 bytes buffer. */
  119         u_char *result = PADLOCK_ALIGN(buf);
  120 
  121         ((uint32_t *)result)[0] = 0x67452301;
  122         ((uint32_t *)result)[1] = 0xEFCDAB89;
  123         ((uint32_t *)result)[2] = 0x98BADCFE;
  124         ((uint32_t *)result)[3] = 0x10325476;
  125         ((uint32_t *)result)[4] = 0xC3D2E1F0;
  126 
  127         __asm __volatile(
  128                 ".byte  0xf3, 0x0f, 0xa6, 0xc8" /* rep xsha1 */
  129                         : "+S"(in), "+D"(result)
  130                         : "c"(count), "a"(0)
  131                 );
  132 
  133         padlock_output_block((uint32_t *)result, (uint32_t *)out,
  134             SHA1_HASH_LEN / sizeof(uint32_t));
  135 }
  136 
  137 static void
  138 padlock_do_sha256(const char *in, char *out, int count)
  139 {
  140         char buf[128+16];       /* PadLock needs at least 128 bytes buffer. */
  141         char *result = PADLOCK_ALIGN(buf);
  142 
  143         ((uint32_t *)result)[0] = 0x6A09E667;
  144         ((uint32_t *)result)[1] = 0xBB67AE85;
  145         ((uint32_t *)result)[2] = 0x3C6EF372;
  146         ((uint32_t *)result)[3] = 0xA54FF53A;
  147         ((uint32_t *)result)[4] = 0x510E527F;
  148         ((uint32_t *)result)[5] = 0x9B05688C;
  149         ((uint32_t *)result)[6] = 0x1F83D9AB;
  150         ((uint32_t *)result)[7] = 0x5BE0CD19;
  151 
  152         __asm __volatile(
  153                 ".byte  0xf3, 0x0f, 0xa6, 0xd0" /* rep xsha256 */
  154                         : "+S"(in), "+D"(result)
  155                         : "c"(count), "a"(0)
  156                 );
  157 
  158         padlock_output_block((uint32_t *)result, (uint32_t *)out,
  159             SHA2_256_HASH_LEN / sizeof(uint32_t));
  160 }
  161 
  162 static void
  163 padlock_sha_init(void *vctx)
  164 {
  165         struct padlock_sha_ctx *ctx;
  166 
  167         ctx = vctx;
  168         ctx->psc_buf = NULL;
  169         ctx->psc_offset = 0;
  170         ctx->psc_size = 0;
  171 }
  172 
  173 static int
  174 padlock_sha_update(void *vctx, const void *buf, u_int bufsize)
  175 {
  176         struct padlock_sha_ctx *ctx;
  177 
  178         ctx = vctx;
  179         if (ctx->psc_size - ctx->psc_offset < bufsize) {
  180                 ctx->psc_size = MAX(ctx->psc_size * 2, ctx->psc_size + bufsize);
  181                 ctx->psc_buf = realloc(ctx->psc_buf, ctx->psc_size, M_PADLOCK,
  182                     M_NOWAIT);
  183                 if(ctx->psc_buf == NULL)
  184                         return (ENOMEM);
  185         }
  186         bcopy(buf, ctx->psc_buf + ctx->psc_offset, bufsize);
  187         ctx->psc_offset += bufsize;
  188         return (0);
  189 }
  190 
  191 static void
  192 padlock_sha_free(void *vctx)
  193 {
  194         struct padlock_sha_ctx *ctx;
  195 
  196         ctx = vctx;
  197         if (ctx->psc_buf != NULL) {
  198                 zfree(ctx->psc_buf, M_PADLOCK);
  199                 ctx->psc_buf = NULL;
  200                 ctx->psc_offset = 0;
  201                 ctx->psc_size = 0;
  202         }
  203 }
  204 
  205 static void
  206 padlock_sha1_final(uint8_t *hash, void *vctx)
  207 {
  208         struct padlock_sha_ctx *ctx;
  209 
  210         ctx = vctx;
  211         padlock_do_sha1(ctx->psc_buf, hash, ctx->psc_offset);
  212         padlock_sha_free(ctx);
  213 }
  214 
  215 static void
  216 padlock_sha256_final(uint8_t *hash, void *vctx)
  217 {
  218         struct padlock_sha_ctx *ctx;
  219 
  220         ctx = vctx;
  221         padlock_do_sha256(ctx->psc_buf, hash, ctx->psc_offset);
  222         padlock_sha_free(ctx);
  223 }
  224 
  225 static void
  226 padlock_copy_ctx(const struct auth_hash *axf, void *sctx, void *dctx)
  227 {
  228 
  229         if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
  230             (axf->type == CRYPTO_SHA1_HMAC ||
  231              axf->type == CRYPTO_SHA2_256_HMAC)) {
  232                 struct padlock_sha_ctx *spctx = sctx, *dpctx = dctx;
  233 
  234                 dpctx->psc_offset = spctx->psc_offset;
  235                 dpctx->psc_size = spctx->psc_size;
  236                 dpctx->psc_buf = malloc(dpctx->psc_size, M_PADLOCK, M_WAITOK);
  237                 bcopy(spctx->psc_buf, dpctx->psc_buf, dpctx->psc_size);
  238         } else {
  239                 bcopy(sctx, dctx, axf->ctxsize);
  240         }
  241 }
  242 
  243 static void
  244 padlock_free_ctx(const struct auth_hash *axf, void *ctx)
  245 {
  246 
  247         if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
  248             (axf->type == CRYPTO_SHA1_HMAC ||
  249              axf->type == CRYPTO_SHA2_256_HMAC)) {
  250                 padlock_sha_free(ctx);
  251         }
  252 }
  253 
  254 static void
  255 padlock_hash_key_setup(struct padlock_session *ses, const uint8_t *key,
  256     int klen)
  257 {
  258         const struct auth_hash *axf;
  259 
  260         axf = ses->ses_axf;
  261 
  262         /*
  263          * Try to free contexts before using them, because
  264          * padlock_hash_key_setup() can be called twice - once from
  265          * padlock_newsession() and again from padlock_process().
  266          */
  267         padlock_free_ctx(axf, ses->ses_ictx);
  268         padlock_free_ctx(axf, ses->ses_octx);
  269 
  270         hmac_init_ipad(axf, key, klen, ses->ses_ictx);
  271         hmac_init_opad(axf, key, klen, ses->ses_octx);
  272 }
  273 
  274 /*
  275  * Compute keyed-hash authenticator.
  276  */
  277 static int
  278 padlock_authcompute(struct padlock_session *ses, struct cryptop *crp)
  279 {
  280         u_char hash[HASH_MAX_LEN], hash2[HASH_MAX_LEN];
  281         const struct auth_hash *axf;
  282         union authctx ctx;
  283         int error;
  284 
  285         axf = ses->ses_axf;
  286 
  287         padlock_copy_ctx(axf, ses->ses_ictx, &ctx);
  288         error = crypto_apply(crp, crp->crp_aad_start, crp->crp_aad_length,
  289             axf->Update, &ctx);
  290         if (error != 0) {
  291                 padlock_free_ctx(axf, &ctx);
  292                 return (error);
  293         }
  294         error = crypto_apply(crp, crp->crp_payload_start,
  295             crp->crp_payload_length, axf->Update, &ctx);
  296         if (error != 0) {
  297                 padlock_free_ctx(axf, &ctx);
  298                 return (error);
  299         }
  300         axf->Final(hash, &ctx);
  301 
  302         padlock_copy_ctx(axf, ses->ses_octx, &ctx);
  303         axf->Update(&ctx, hash, axf->hashsize);
  304         axf->Final(hash, &ctx);
  305 
  306         if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
  307                 crypto_copydata(crp, crp->crp_digest_start, ses->ses_mlen,
  308                     hash2);
  309                 if (timingsafe_bcmp(hash, hash2, ses->ses_mlen) != 0)
  310                         return (EBADMSG);
  311         } else
  312                 crypto_copyback(crp, crp->crp_digest_start, ses->ses_mlen,
  313                     hash);
  314         return (0);
  315 }
  316 
  317 /* Find software structure which describes HMAC algorithm. */
  318 static const struct auth_hash *
  319 padlock_hash_lookup(int alg)
  320 {
  321         const struct auth_hash *axf;
  322 
  323         switch (alg) {
  324         case CRYPTO_NULL_HMAC:
  325                 axf = &auth_hash_null;
  326                 break;
  327         case CRYPTO_SHA1_HMAC:
  328                 if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
  329                         axf = &padlock_hmac_sha1;
  330                 else
  331                         axf = &auth_hash_hmac_sha1;
  332                 break;
  333         case CRYPTO_RIPEMD160_HMAC:
  334                 axf = &auth_hash_hmac_ripemd_160;
  335                 break;
  336         case CRYPTO_SHA2_256_HMAC:
  337                 if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
  338                         axf = &padlock_hmac_sha256;
  339                 else
  340                         axf = &auth_hash_hmac_sha2_256;
  341                 break;
  342         case CRYPTO_SHA2_384_HMAC:
  343                 axf = &auth_hash_hmac_sha2_384;
  344                 break;
  345         case CRYPTO_SHA2_512_HMAC:
  346                 axf = &auth_hash_hmac_sha2_512;
  347                 break;
  348         default:
  349                 axf = NULL;
  350                 break;
  351         }
  352         return (axf);
  353 }
  354 
  355 bool
  356 padlock_hash_check(const struct crypto_session_params *csp)
  357 {
  358 
  359         return (padlock_hash_lookup(csp->csp_auth_alg) != NULL);
  360 }
  361 
  362 int
  363 padlock_hash_setup(struct padlock_session *ses,
  364     const struct crypto_session_params *csp)
  365 {
  366 
  367         ses->ses_axf = padlock_hash_lookup(csp->csp_auth_alg);
  368         if (csp->csp_auth_mlen == 0)
  369                 ses->ses_mlen = ses->ses_axf->hashsize;
  370         else
  371                 ses->ses_mlen = csp->csp_auth_mlen;
  372 
  373         /* Allocate memory for HMAC inner and outer contexts. */
  374         ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
  375             M_ZERO | M_NOWAIT);
  376         ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
  377             M_ZERO | M_NOWAIT);
  378         if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
  379                 return (ENOMEM);
  380 
  381         /* Setup key if given. */
  382         if (csp->csp_auth_key != NULL) {
  383                 padlock_hash_key_setup(ses, csp->csp_auth_key,
  384                     csp->csp_auth_klen);
  385         }
  386         return (0);
  387 }
  388 
  389 int
  390 padlock_hash_process(struct padlock_session *ses, struct cryptop *crp,
  391     const struct crypto_session_params *csp)
  392 {
  393         struct thread *td;
  394         int error;
  395 
  396         td = curthread;
  397         fpu_kern_enter(td, ses->ses_fpu_ctx, FPU_KERN_NORMAL | FPU_KERN_KTHR);
  398         if (crp->crp_auth_key != NULL)
  399                 padlock_hash_key_setup(ses, crp->crp_auth_key,
  400                     csp->csp_auth_klen);
  401 
  402         error = padlock_authcompute(ses, crp);
  403         fpu_kern_leave(td, ses->ses_fpu_ctx);
  404         return (error);
  405 }
  406 
  407 void
  408 padlock_hash_free(struct padlock_session *ses)
  409 {
  410 
  411         if (ses->ses_ictx != NULL) {
  412                 padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
  413                 zfree(ses->ses_ictx, M_PADLOCK);
  414                 ses->ses_ictx = NULL;
  415         }
  416         if (ses->ses_octx != NULL) {
  417                 padlock_free_ctx(ses->ses_axf, ses->ses_octx);
  418                 zfree(ses->ses_octx, M_PADLOCK);
  419                 ses->ses_octx = NULL;
  420         }
  421 }
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FreeBSD/Linux Kernel Cross Reference sys/crypto/via/padlock_hash.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/via/padlock_hash.c
