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 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 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 #ifdef __GNUCLIKE_ASM
  128         __asm __volatile(
  129                 ".byte  0xf3, 0x0f, 0xa6, 0xc8" /* rep xsha1 */
  130                         : "+S"(in), "+D"(result)
  131                         : "c"(count), "a"(0)
  132                 );
  133 #endif
  134 
  135         padlock_output_block((uint32_t *)result, (uint32_t *)out,
  136             SHA1_HASH_LEN / sizeof(uint32_t));
  137 }
  138 
  139 static void
  140 padlock_do_sha256(const char *in, char *out, int count)
  141 {
  142         char buf[128+16];       /* PadLock needs at least 128 bytes buffer. */
  143         char *result = PADLOCK_ALIGN(buf);
  144 
  145         ((uint32_t *)result)[0] = 0x6A09E667;
  146         ((uint32_t *)result)[1] = 0xBB67AE85;
  147         ((uint32_t *)result)[2] = 0x3C6EF372;
  148         ((uint32_t *)result)[3] = 0xA54FF53A;
  149         ((uint32_t *)result)[4] = 0x510E527F;
  150         ((uint32_t *)result)[5] = 0x9B05688C;
  151         ((uint32_t *)result)[6] = 0x1F83D9AB;
  152         ((uint32_t *)result)[7] = 0x5BE0CD19;
  153 
  154 #ifdef __GNUCLIKE_ASM
  155         __asm __volatile(
  156                 ".byte  0xf3, 0x0f, 0xa6, 0xd0" /* rep xsha256 */
  157                         : "+S"(in), "+D"(result)
  158                         : "c"(count), "a"(0)
  159                 );
  160 #endif
  161 
  162         padlock_output_block((uint32_t *)result, (uint32_t *)out,
  163             SHA2_256_HASH_LEN / sizeof(uint32_t));
  164 }
  165 
  166 static void
  167 padlock_sha_init(void *vctx)
  168 {
  169         struct padlock_sha_ctx *ctx;
  170 
  171         ctx = vctx;
  172         ctx->psc_buf = NULL;
  173         ctx->psc_offset = 0;
  174         ctx->psc_size = 0;
  175 }
  176 
  177 static int
  178 padlock_sha_update(void *vctx, const void *buf, u_int bufsize)
  179 {
  180         struct padlock_sha_ctx *ctx;
  181 
  182         ctx = vctx;
  183         if (ctx->psc_size - ctx->psc_offset < bufsize) {
  184                 ctx->psc_size = MAX(ctx->psc_size * 2, ctx->psc_size + bufsize);
  185                 ctx->psc_buf = realloc(ctx->psc_buf, ctx->psc_size, M_PADLOCK,
  186                     M_NOWAIT);
  187                 if(ctx->psc_buf == NULL)
  188                         return (ENOMEM);
  189         }
  190         bcopy(buf, ctx->psc_buf + ctx->psc_offset, bufsize);
  191         ctx->psc_offset += bufsize;
  192         return (0);
  193 }
  194 
  195 static void
  196 padlock_sha_free(void *vctx)
  197 {
  198         struct padlock_sha_ctx *ctx;
  199 
  200         ctx = vctx;
  201         if (ctx->psc_buf != NULL) {
  202                 zfree(ctx->psc_buf, M_PADLOCK);
  203                 ctx->psc_buf = NULL;
  204                 ctx->psc_offset = 0;
  205                 ctx->psc_size = 0;
  206         }
  207 }
  208 
  209 static void
  210 padlock_sha1_final(uint8_t *hash, void *vctx)
  211 {
  212         struct padlock_sha_ctx *ctx;
  213 
  214         ctx = vctx;
  215         padlock_do_sha1(ctx->psc_buf, hash, ctx->psc_offset);
  216         padlock_sha_free(ctx);
  217 }
  218 
  219 static void
  220 padlock_sha256_final(uint8_t *hash, void *vctx)
  221 {
  222         struct padlock_sha_ctx *ctx;
  223 
  224         ctx = vctx;
  225         padlock_do_sha256(ctx->psc_buf, hash, ctx->psc_offset);
  226         padlock_sha_free(ctx);
  227 }
  228 
  229 static void
  230 padlock_copy_ctx(struct auth_hash *axf, void *sctx, void *dctx)
  231 {
  232 
  233         if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
  234             (axf->type == CRYPTO_SHA1_HMAC ||
  235              axf->type == CRYPTO_SHA2_256_HMAC)) {
  236                 struct padlock_sha_ctx *spctx = sctx, *dpctx = dctx;
  237 
  238                 dpctx->psc_offset = spctx->psc_offset;
  239                 dpctx->psc_size = spctx->psc_size;
  240                 dpctx->psc_buf = malloc(dpctx->psc_size, M_PADLOCK, M_WAITOK);
  241                 bcopy(spctx->psc_buf, dpctx->psc_buf, dpctx->psc_size);
  242         } else {
  243                 bcopy(sctx, dctx, axf->ctxsize);
  244         }
  245 }
  246 
  247 static void
  248 padlock_free_ctx(struct auth_hash *axf, void *ctx)
  249 {
  250 
  251         if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
  252             (axf->type == CRYPTO_SHA1_HMAC ||
  253              axf->type == CRYPTO_SHA2_256_HMAC)) {
  254                 padlock_sha_free(ctx);
  255         }
  256 }
  257 
  258 static void
  259 padlock_hash_key_setup(struct padlock_session *ses, const uint8_t *key,
  260     int klen)
  261 {
  262         struct auth_hash *axf;
  263 
  264         axf = ses->ses_axf;
  265 
  266         /*
  267          * Try to free contexts before using them, because
  268          * padlock_hash_key_setup() can be called twice - once from
  269          * padlock_newsession() and again from padlock_process().
  270          */
  271         padlock_free_ctx(axf, ses->ses_ictx);
  272         padlock_free_ctx(axf, ses->ses_octx);
  273 
  274         hmac_init_ipad(axf, key, klen, ses->ses_ictx);
  275         hmac_init_opad(axf, key, klen, ses->ses_octx);
  276 }
  277 
  278 /*
  279  * Compute keyed-hash authenticator.
  280  */
  281 static int
  282 padlock_authcompute(struct padlock_session *ses, struct cryptop *crp)
  283 {
  284         u_char hash[HASH_MAX_LEN], hash2[HASH_MAX_LEN];
  285         struct auth_hash *axf;
  286         union authctx ctx;
  287         int error;
  288 
  289         axf = ses->ses_axf;
  290 
  291         padlock_copy_ctx(axf, ses->ses_ictx, &ctx);
  292         error = crypto_apply(crp, crp->crp_aad_start, crp->crp_aad_length,
  293             axf->Update, &ctx);
  294         if (error != 0) {
  295                 padlock_free_ctx(axf, &ctx);
  296                 return (error);
  297         }
  298         error = crypto_apply(crp, crp->crp_payload_start,
  299             crp->crp_payload_length, axf->Update, &ctx);
  300         if (error != 0) {
  301                 padlock_free_ctx(axf, &ctx);
  302                 return (error);
  303         }
  304         axf->Final(hash, &ctx);
  305 
  306         padlock_copy_ctx(axf, ses->ses_octx, &ctx);
  307         axf->Update(&ctx, hash, axf->hashsize);
  308         axf->Final(hash, &ctx);
  309 
  310         if (crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
  311                 crypto_copydata(crp, crp->crp_digest_start, ses->ses_mlen,
  312                     hash2);
  313                 if (timingsafe_bcmp(hash, hash2, ses->ses_mlen) != 0)
  314                         return (EBADMSG);
  315         } else
  316                 crypto_copyback(crp, crp->crp_digest_start, ses->ses_mlen,
  317                     hash);
  318         return (0);
  319 }
  320 
  321 /* Find software structure which describes HMAC algorithm. */
  322 static struct auth_hash *
  323 padlock_hash_lookup(int alg)
  324 {
  325         struct auth_hash *axf;
  326 
  327         switch (alg) {
  328         case CRYPTO_NULL_HMAC:
  329                 axf = &auth_hash_null;
  330                 break;
  331         case CRYPTO_SHA1_HMAC:
  332                 if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
  333                         axf = &padlock_hmac_sha1;
  334                 else
  335                         axf = &auth_hash_hmac_sha1;
  336                 break;
  337         case CRYPTO_RIPEMD160_HMAC:
  338                 axf = &auth_hash_hmac_ripemd_160;
  339                 break;
  340         case CRYPTO_SHA2_256_HMAC:
  341                 if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
  342                         axf = &padlock_hmac_sha256;
  343                 else
  344                         axf = &auth_hash_hmac_sha2_256;
  345                 break;
  346         case CRYPTO_SHA2_384_HMAC:
  347                 axf = &auth_hash_hmac_sha2_384;
  348                 break;
  349         case CRYPTO_SHA2_512_HMAC:
  350                 axf = &auth_hash_hmac_sha2_512;
  351                 break;
  352         default:
  353                 axf = NULL;
  354                 break;
  355         }
  356         return (axf);
  357 }
  358 
  359 bool
  360 padlock_hash_check(const struct crypto_session_params *csp)
  361 {
  362 
  363         return (padlock_hash_lookup(csp->csp_auth_alg) != NULL);
  364 }
  365 
  366 int
  367 padlock_hash_setup(struct padlock_session *ses,
  368     const struct crypto_session_params *csp)
  369 {
  370 
  371         ses->ses_axf = padlock_hash_lookup(csp->csp_auth_alg);
  372         if (csp->csp_auth_mlen == 0)
  373                 ses->ses_mlen = ses->ses_axf->hashsize;
  374         else
  375                 ses->ses_mlen = csp->csp_auth_mlen;
  376 
  377         /* Allocate memory for HMAC inner and outer contexts. */
  378         ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
  379             M_ZERO | M_NOWAIT);
  380         ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
  381             M_ZERO | M_NOWAIT);
  382         if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
  383                 return (ENOMEM);
  384 
  385         /* Setup key if given. */
  386         if (csp->csp_auth_key != NULL) {
  387                 padlock_hash_key_setup(ses, csp->csp_auth_key,
  388                     csp->csp_auth_klen);
  389         }
  390         return (0);
  391 }
  392 
  393 int
  394 padlock_hash_process(struct padlock_session *ses, struct cryptop *crp,
  395     const struct crypto_session_params *csp)
  396 {
  397         struct thread *td;
  398         int error;
  399 
  400         td = curthread;
  401         fpu_kern_enter(td, ses->ses_fpu_ctx, FPU_KERN_NORMAL | FPU_KERN_KTHR);
  402         if (crp->crp_auth_key != NULL)
  403                 padlock_hash_key_setup(ses, crp->crp_auth_key,
  404                     csp->csp_auth_klen);
  405 
  406         error = padlock_authcompute(ses, crp);
  407         fpu_kern_leave(td, ses->ses_fpu_ctx);
  408         return (error);
  409 }
  410 
  411 void
  412 padlock_hash_free(struct padlock_session *ses)
  413 {
  414 
  415         if (ses->ses_ictx != NULL) {
  416                 padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
  417                 zfree(ses->ses_ictx, M_PADLOCK);
  418                 ses->ses_ictx = NULL;
  419         }
  420         if (ses->ses_octx != NULL) {
  421                 padlock_free_ctx(ses->ses_axf, ses->ses_octx);
  422                 zfree(ses->ses_octx, M_PADLOCK);
  423                 ses->ses_octx = NULL;
  424         }
  425 }
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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
