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

     /*-
      * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/malloc.h>
    #include <sys/libkern.h>
    #include <sys/endian.h>
    #if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
    #include <machine/cpufunc.h>
    #include <machine/cputypes.h>
    #include <machine/md_var.h>
    #include <machine/specialreg.h>
    #endif
    
    #include <opencrypto/cryptodev.h>
    #include <opencrypto/cryptosoft.h> /* for hmac_ipad_buffer and hmac_opad_buffer */
    #include <opencrypto/xform.h>
    
    #include <crypto/via/padlock.h>
    
    /*
     * Implementation notes.
     *
     * Some VIA CPUs provides SHA1 and SHA256 acceleration.
     * We implement all HMAC algorithms provided by crypto(9) framework, but we do
     * the crypto work in software unless this is HMAC/SHA1 or HMAC/SHA256 and
     * our CPU can accelerate it.
     *
     * Additional CPU instructions, which preform SHA1 and SHA256 are one-shot
     * functions - we have only one chance to give the data, CPU itself will add
     * the padding and calculate hash automatically.
     * This means, it is not possible to implement common init(), update(), final()
     * methods.
     * The way I've choosen is to keep adding data to the buffer on update()
     * (reallocating the buffer if necessary) and call XSHA{1,256} instruction on
     * final().
     */
    
    struct padlock_sha_ctx {
            uint8_t *psc_buf;
            int      psc_offset;
            int      psc_size;
    };
    CTASSERT(sizeof(struct padlock_sha_ctx) <= sizeof(union authctx));
    
    static void padlock_sha_init(struct padlock_sha_ctx *ctx);
    static int padlock_sha_update(struct padlock_sha_ctx *ctx, uint8_t *buf,
        uint16_t bufsize);
    static void padlock_sha1_final(uint8_t *hash, struct padlock_sha_ctx *ctx);
    static void padlock_sha256_final(uint8_t *hash, struct padlock_sha_ctx *ctx);
    
    static struct auth_hash padlock_hmac_sha1 = {
            CRYPTO_SHA1_HMAC, "HMAC-SHA1",
            20, SHA1_HASH_LEN, SHA1_HMAC_BLOCK_LEN, sizeof(struct padlock_sha_ctx),
            (void (*)(void *))padlock_sha_init,
            (int (*)(void *, uint8_t *, uint16_t))padlock_sha_update,
            (void (*)(uint8_t *, void *))padlock_sha1_final
    };
    
    static struct auth_hash padlock_hmac_sha256 = {
            CRYPTO_SHA2_256_HMAC, "HMAC-SHA2-256",
            32, SHA2_256_HASH_LEN, SHA2_256_HMAC_BLOCK_LEN, sizeof(struct padlock_sha_ctx),
            (void (*)(void *))padlock_sha_init,
            (int (*)(void *, uint8_t *, uint16_t))padlock_sha_update,
            (void (*)(uint8_t *, void *))padlock_sha256_final
    };
    
    MALLOC_DECLARE(M_PADLOCK);
    
    static __inline void
   padlock_output_block(uint32_t *src, uint32_t *dst, size_t count)
   {
   
           while (count-- > 0)
                   *dst++ = bswap32(*src++);
   }
   
   static void
   padlock_do_sha1(const u_char *in, u_char *out, int count)
   {
           u_char buf[128+16];     /* PadLock needs at least 128 bytes buffer. */
           u_char *result = PADLOCK_ALIGN(buf);
   
           ((uint32_t *)result)[0] = 0x67452301;
           ((uint32_t *)result)[1] = 0xEFCDAB89;
           ((uint32_t *)result)[2] = 0x98BADCFE;
           ((uint32_t *)result)[3] = 0x10325476;
           ((uint32_t *)result)[4] = 0xC3D2E1F0;
   
   #ifdef __GNUCLIKE_ASM
           __asm __volatile(
                   ".byte  0xf3, 0x0f, 0xa6, 0xc8" /* rep xsha1 */
                           : "+S"(in), "+D"(result)
                           : "c"(count), "a"(0)
                   );
   #endif
   
           padlock_output_block((uint32_t *)result, (uint32_t *)out,
               SHA1_HASH_LEN / sizeof(uint32_t));
   }
   
   static void
   padlock_do_sha256(const char *in, char *out, int count)
   {
           char buf[128+16];       /* PadLock needs at least 128 bytes buffer. */
           char *result = PADLOCK_ALIGN(buf);
   
           ((uint32_t *)result)[0] = 0x6A09E667;
           ((uint32_t *)result)[1] = 0xBB67AE85;
           ((uint32_t *)result)[2] = 0x3C6EF372;
           ((uint32_t *)result)[3] = 0xA54FF53A;
           ((uint32_t *)result)[4] = 0x510E527F;
           ((uint32_t *)result)[5] = 0x9B05688C;
           ((uint32_t *)result)[6] = 0x1F83D9AB;
           ((uint32_t *)result)[7] = 0x5BE0CD19;
   
   #ifdef __GNUCLIKE_ASM
           __asm __volatile(
                   ".byte  0xf3, 0x0f, 0xa6, 0xd0" /* rep xsha256 */
                           : "+S"(in), "+D"(result)
                           : "c"(count), "a"(0)
                   );
   #endif
   
           padlock_output_block((uint32_t *)result, (uint32_t *)out,
               SHA2_256_HASH_LEN / sizeof(uint32_t));
   }
   
   static void
   padlock_sha_init(struct padlock_sha_ctx *ctx)
   {
   
           ctx->psc_buf = NULL;
           ctx->psc_offset = 0;
           ctx->psc_size = 0;
   }
   
   static int
   padlock_sha_update(struct padlock_sha_ctx *ctx, uint8_t *buf, uint16_t bufsize)
   {
   
           if (ctx->psc_size - ctx->psc_offset < bufsize) {
                   ctx->psc_size = MAX(ctx->psc_size * 2, ctx->psc_size + bufsize);
                   ctx->psc_buf = realloc(ctx->psc_buf, ctx->psc_size, M_PADLOCK,
                       M_NOWAIT);
                   if(ctx->psc_buf == NULL)
                           return (ENOMEM);
           }
           bcopy(buf, ctx->psc_buf + ctx->psc_offset, bufsize);
           ctx->psc_offset += bufsize;
           return (0);
   }
   
   static void
   padlock_sha_free(struct padlock_sha_ctx *ctx)
   {
   
           if (ctx->psc_buf != NULL) {
                   //bzero(ctx->psc_buf, ctx->psc_size);
                   free(ctx->psc_buf, M_PADLOCK);
                   ctx->psc_buf = NULL;
                   ctx->psc_offset = 0;
                   ctx->psc_size = 0;
           }
   }
   
   static void
   padlock_sha1_final(uint8_t *hash, struct padlock_sha_ctx *ctx)
   {
   
           padlock_do_sha1(ctx->psc_buf, hash, ctx->psc_offset);
           padlock_sha_free(ctx);
   }
   
   static void
   padlock_sha256_final(uint8_t *hash, struct padlock_sha_ctx *ctx)
   {
   
           padlock_do_sha256(ctx->psc_buf, hash, ctx->psc_offset);
           padlock_sha_free(ctx);
   }
   
   static void
   padlock_copy_ctx(struct auth_hash *axf, void *sctx, void *dctx)
   {
   
           if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
               (axf->type == CRYPTO_SHA1_HMAC ||
                axf->type == CRYPTO_SHA2_256_HMAC)) {
                   struct padlock_sha_ctx *spctx = sctx, *dpctx = dctx;
   
                   dpctx->psc_offset = spctx->psc_offset;
                   dpctx->psc_size = spctx->psc_size;
                   dpctx->psc_buf = malloc(dpctx->psc_size, M_PADLOCK, M_WAITOK);
                   bcopy(spctx->psc_buf, dpctx->psc_buf, dpctx->psc_size);
           } else {
                   bcopy(sctx, dctx, axf->ctxsize);
           }
   }
   
   static void
   padlock_free_ctx(struct auth_hash *axf, void *ctx)
   {
   
           if ((via_feature_xcrypt & VIA_HAS_SHA) != 0 &&
               (axf->type == CRYPTO_SHA1_HMAC ||
                axf->type == CRYPTO_SHA2_256_HMAC)) {
                   padlock_sha_free(ctx);
           }
   }
   
   static void
   padlock_hash_key_setup(struct padlock_session *ses, caddr_t key, int klen)
   {
           struct auth_hash *axf;
           int i;
   
           klen /= 8;
           axf = ses->ses_axf;
   
           /*
            * Try to free contexts before using them, because
            * padlock_hash_key_setup() can be called twice - once from
            * padlock_newsession() and again from padlock_process().
            */
           padlock_free_ctx(axf, ses->ses_ictx);
           padlock_free_ctx(axf, ses->ses_octx);
   
           for (i = 0; i < klen; i++)
                   key[i] ^= HMAC_IPAD_VAL;
   
           axf->Init(ses->ses_ictx);
           axf->Update(ses->ses_ictx, key, klen);
           axf->Update(ses->ses_ictx, hmac_ipad_buffer, axf->blocksize - klen);
   
           for (i = 0; i < klen; i++)
                   key[i] ^= (HMAC_IPAD_VAL ^ HMAC_OPAD_VAL);
   
           axf->Init(ses->ses_octx);
           axf->Update(ses->ses_octx, key, klen);
           axf->Update(ses->ses_octx, hmac_opad_buffer, axf->blocksize - klen);
   
           for (i = 0; i < klen; i++)
                   key[i] ^= HMAC_OPAD_VAL;
   }
   
   /*
    * Compute keyed-hash authenticator.
    */
   static int
   padlock_authcompute(struct padlock_session *ses, struct cryptodesc *crd,
       caddr_t buf, int flags)
   {
           u_char hash[HASH_MAX_LEN];
           struct auth_hash *axf;
           union authctx ctx;
           int error;
   
           axf = ses->ses_axf;
   
           padlock_copy_ctx(axf, ses->ses_ictx, &ctx);
           error = crypto_apply(flags, buf, crd->crd_skip, crd->crd_len,
               (int (*)(void *, void *, unsigned int))axf->Update, (caddr_t)&ctx);
           if (error != 0) {
                   padlock_free_ctx(axf, &ctx);
                   return (error);
           }
           axf->Final(hash, &ctx);
   
           padlock_copy_ctx(axf, ses->ses_octx, &ctx);
           axf->Update(&ctx, hash, axf->hashsize);
           axf->Final(hash, &ctx);
   
           /* Inject the authentication data */
           crypto_copyback(flags, buf, crd->crd_inject,
               ses->ses_mlen == 0 ? axf->hashsize : ses->ses_mlen, hash);
           return (0);
   }
   
   int
   padlock_hash_setup(struct padlock_session *ses, struct cryptoini *macini)
   {
   
           ses->ses_mlen = macini->cri_mlen;
   
           /* Find software structure which describes HMAC algorithm. */
           switch (macini->cri_alg) {
           case CRYPTO_NULL_HMAC:
                   ses->ses_axf = &auth_hash_null;
                   break;
           case CRYPTO_MD5_HMAC:
                   ses->ses_axf = &auth_hash_hmac_md5;
                   break;
           case CRYPTO_SHA1_HMAC:
                   if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
                           ses->ses_axf = &padlock_hmac_sha1;
                   else
                           ses->ses_axf = &auth_hash_hmac_sha1;
                   break;
           case CRYPTO_RIPEMD160_HMAC:
                   ses->ses_axf = &auth_hash_hmac_ripemd_160;
                   break;
           case CRYPTO_SHA2_256_HMAC:
                   if ((via_feature_xcrypt & VIA_HAS_SHA) != 0)
                           ses->ses_axf = &padlock_hmac_sha256;
                   else
                           ses->ses_axf = &auth_hash_hmac_sha2_256;
                   break;
           case CRYPTO_SHA2_384_HMAC:
                   ses->ses_axf = &auth_hash_hmac_sha2_384;
                   break;
           case CRYPTO_SHA2_512_HMAC:
                   ses->ses_axf = &auth_hash_hmac_sha2_512;
                   break;
           }
   
           /* Allocate memory for HMAC inner and outer contexts. */
           ses->ses_ictx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
               M_ZERO | M_NOWAIT);
           ses->ses_octx = malloc(ses->ses_axf->ctxsize, M_PADLOCK,
               M_ZERO | M_NOWAIT);
           if (ses->ses_ictx == NULL || ses->ses_octx == NULL)
                   return (ENOMEM);
   
           /* Setup key if given. */
           if (macini->cri_key != NULL) {
                   padlock_hash_key_setup(ses, macini->cri_key,
                       macini->cri_klen);
           }
           return (0);
   }
   
   int
   padlock_hash_process(struct padlock_session *ses, struct cryptodesc *maccrd,
       struct cryptop *crp)
   {
           int error;
   
           if ((maccrd->crd_flags & CRD_F_KEY_EXPLICIT) != 0)
                   padlock_hash_key_setup(ses, maccrd->crd_key, maccrd->crd_klen);
   
           error = padlock_authcompute(ses, maccrd, crp->crp_buf, crp->crp_flags);
           return (error);
   }
   
   void
   padlock_hash_free(struct padlock_session *ses)
   {
   
           if (ses->ses_ictx != NULL) {
                   padlock_free_ctx(ses->ses_axf, ses->ses_ictx);
                   bzero(ses->ses_ictx, ses->ses_axf->ctxsize);
                   free(ses->ses_ictx, M_PADLOCK);
                   ses->ses_ictx = NULL;
           }
           if (ses->ses_octx != NULL) {
                   padlock_free_ctx(ses->ses_axf, ses->ses_octx);
                   bzero(ses->ses_octx, ses->ses_axf->ctxsize);
                   free(ses->ses_octx, M_PADLOCK);
                   ses->ses_octx = NULL;
           }
   }

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