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openbsd_hw.c
/* Written by Ben Laurie, 2001 */
/*
 * Copyright (c) 2001 The OpenSSL Project.  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.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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 <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/rsa.h>
#include "evp_locl.h"

/* This stuff should now all be supported through
 * crypto/engine/hw_openbsd_dev_crypto.c unless I botched it up */
static void *dummy=&dummy;

#if 0

/* check flag after OpenSSL headers to ensure make depend works */
#ifdef OPENSSL_OPENBSD_DEV_CRYPTO

#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <crypto/cryptodev.h>
#include <unistd.h>
#include <assert.h>

/* longest key supported in hardware */
#define MAX_HW_KEY      24
#define MAX_HW_IV 8

#define MD5_DIGEST_LENGTH     16
#define MD5_CBLOCK            64

static int fd;
static int dev_failed;

typedef struct session_op session_op;

#define CDATA(ctx) EVP_C_DATA(session_op,ctx)

static void err(const char *str)
    {
    fprintf(stderr,"%s: errno %d\n",str,errno);
    }

static int dev_crypto_init(session_op *ses)
    {
    if(dev_failed)
      return 0;
    if(!fd)
      {
      int cryptodev_fd;

        if ((cryptodev_fd=open("/dev/crypto",O_RDWR,0)) < 0)
          {
          err("/dev/crypto");
          dev_failed=1;
          return 0;
          }
        if (ioctl(cryptodev_fd,CRIOGET,&fd) == -1)
          {
          err("CRIOGET failed");
          close(cryptodev_fd);
          dev_failed=1;
          return 0;
          }
      close(cryptodev_fd);
      }
    assert(ses);
    memset(ses,'\0',sizeof *ses);

    return 1;
    }

static int dev_crypto_cleanup(EVP_CIPHER_CTX *ctx)
    {
    if(ioctl(fd,CIOCFSESSION,&CDATA(ctx)->ses) == -1)
      err("CIOCFSESSION failed");

    OPENSSL_free(CDATA(ctx)->key);

    return 1;
    }

static int dev_crypto_init_key(EVP_CIPHER_CTX *ctx,int cipher,
                         const unsigned char *key,int klen)
    {
    if(!dev_crypto_init(CDATA(ctx)))
      return 0;

    CDATA(ctx)->key=OPENSSL_malloc(MAX_HW_KEY);

    assert(ctx->cipher->iv_len <= MAX_HW_IV);

    memcpy(CDATA(ctx)->key,key,klen);
    
    CDATA(ctx)->cipher=cipher;
    CDATA(ctx)->keylen=klen;

    if (ioctl(fd,CIOCGSESSION,CDATA(ctx)) == -1)
      {
      err("CIOCGSESSION failed");
      return 0;
      }
    return 1;
    }

static int dev_crypto_cipher(EVP_CIPHER_CTX *ctx,unsigned char *out,
                       const unsigned char *in,unsigned int inl)
    {
    struct crypt_op cryp;
    unsigned char lb[MAX_HW_IV];

    if(!inl)
      return 1;

    assert(CDATA(ctx));
    assert(!dev_failed);

    memset(&cryp,'\0',sizeof cryp);
    cryp.ses=CDATA(ctx)->ses;
    cryp.op=ctx->encrypt ? COP_ENCRYPT : COP_DECRYPT;
    cryp.flags=0;
    cryp.len=inl;
    assert((inl&(ctx->cipher->block_size-1)) == 0);
    cryp.src=(caddr_t)in;
    cryp.dst=(caddr_t)out;
    cryp.mac=0;
    if(ctx->cipher->iv_len)
      cryp.iv=(caddr_t)ctx->iv;

    if(!ctx->encrypt)
      memcpy(lb,&in[cryp.len-ctx->cipher->iv_len],ctx->cipher->iv_len);

    if(ioctl(fd, CIOCCRYPT, &cryp) == -1)
      {
      if(errno == EINVAL) /* buffers are misaligned */
          {
          unsigned int cinl=0;
          char *cin=NULL;
          char *cout=NULL;

          /* NB: this can only make cinl != inl with stream ciphers */
          cinl=(inl+3)/4*4;

          if(((unsigned long)in&3) || cinl != inl)
            {
            cin=OPENSSL_malloc(cinl);
            memcpy(cin,in,inl);
            cryp.src=cin;
            }

          if(((unsigned long)out&3) || cinl != inl)
            {
            cout=OPENSSL_malloc(cinl);
            cryp.dst=cout;
            }

          cryp.len=cinl;

          if(ioctl(fd, CIOCCRYPT, &cryp) == -1)
            {
            err("CIOCCRYPT(2) failed");
            printf("src=%p dst=%p\n",cryp.src,cryp.dst);
            abort();
            return 0;
            }
            
          if(cout)
            {
            memcpy(out,cout,inl);
            OPENSSL_free(cout);
            }
          if(cin)
            OPENSSL_free(cin);
          }
      else 
          {     
          err("CIOCCRYPT failed");
          abort();
          return 0;
          }
      }

    if(ctx->encrypt)
      memcpy(ctx->iv,&out[cryp.len-ctx->cipher->iv_len],ctx->cipher->iv_len);
    else
      memcpy(ctx->iv,lb,ctx->cipher->iv_len);

    return 1;
    }

static int dev_crypto_des_ede3_init_key(EVP_CIPHER_CTX *ctx,
                              const unsigned char *key,
                              const unsigned char *iv, int enc)
    { return dev_crypto_init_key(ctx,CRYPTO_3DES_CBC,key,24); }

#define dev_crypto_des_ede3_cbc_cipher dev_crypto_cipher

BLOCK_CIPHER_def_cbc(dev_crypto_des_ede3, session_op, NID_des_ede3, 8, 24, 8,
                 0, dev_crypto_des_ede3_init_key,
                 dev_crypto_cleanup, 
                 EVP_CIPHER_set_asn1_iv,
                 EVP_CIPHER_get_asn1_iv,
                 NULL)

static int dev_crypto_rc4_init_key(EVP_CIPHER_CTX *ctx,
                              const unsigned char *key,
                              const unsigned char *iv, int enc)
    { return dev_crypto_init_key(ctx,CRYPTO_ARC4,key,16); }

static const EVP_CIPHER r4_cipher=
    {
    NID_rc4,
    1,16,0, /* FIXME: key should be up to 256 bytes */
    EVP_CIPH_VARIABLE_LENGTH,
    dev_crypto_rc4_init_key,
    dev_crypto_cipher,
    dev_crypto_cleanup,
    sizeof(session_op),
    NULL,
    NULL,
    NULL
    };

const EVP_CIPHER *EVP_dev_crypto_rc4(void)
    { return &r4_cipher; }

typedef struct
    {
    session_op sess;
    char *data;
    int len;
    unsigned char md[EVP_MAX_MD_SIZE];
    } MD_DATA;

static int dev_crypto_init_digest(MD_DATA *md_data,int mac)
    {
    if(!dev_crypto_init(&md_data->sess))
      return 0;

    md_data->len=0;
    md_data->data=NULL;

    md_data->sess.mac=mac;

    if (ioctl(fd,CIOCGSESSION,&md_data->sess) == -1)
      {
      err("CIOCGSESSION failed");
      return 0;
      }
    return 1;
    }

static int dev_crypto_cleanup_digest(MD_DATA *md_data)
    {
    if (ioctl(fd,CIOCFSESSION,&md_data->sess.ses) == -1)
      {
      err("CIOCFSESSION failed");
      return 0;
      }

    return 1;
    }

/* FIXME: if device can do chained MACs, then don't accumulate */
/* FIXME: move accumulation to the framework */
static int dev_crypto_md5_init(EVP_MD_CTX *ctx)
    { return dev_crypto_init_digest(ctx->md_data,CRYPTO_MD5); }

static int do_digest(int ses,unsigned char *md,const void *data,int len)
    {
    struct crypt_op cryp;
    static unsigned char md5zero[16]=
      {
      0xd4,0x1d,0x8c,0xd9,0x8f,0x00,0xb2,0x04,
      0xe9,0x80,0x09,0x98,0xec,0xf8,0x42,0x7e
      };

    /* some cards can't do zero length */
    if(!len)
      {
      memcpy(md,md5zero,16);
      return 1;
      }

    memset(&cryp,'\0',sizeof cryp);
    cryp.ses=ses;
    cryp.op=COP_ENCRYPT;/* required to do the MAC rather than check it */
    cryp.len=len;
    cryp.src=(caddr_t)data;
    cryp.dst=(caddr_t)data; // FIXME!!!
    cryp.mac=(caddr_t)md;

    if(ioctl(fd, CIOCCRYPT, &cryp) == -1)
      {
      if(errno == EINVAL) /* buffer is misaligned */
          {
          char *dcopy;

          dcopy=OPENSSL_malloc(len);
          memcpy(dcopy,data,len);
          cryp.src=dcopy;
          cryp.dst=cryp.src; // FIXME!!!

          if(ioctl(fd, CIOCCRYPT, &cryp) == -1)
            {
            err("CIOCCRYPT(MAC2) failed");
            abort();
            return 0;
            }
          OPENSSL_free(dcopy);
          }
      else
          {
          err("CIOCCRYPT(MAC) failed");
          abort();
          return 0;
          }
      }
    //    printf("done\n");

    return 1;
    }

static int dev_crypto_md5_update(EVP_MD_CTX *ctx,const void *data,
                         unsigned long len)
    {
    MD_DATA *md_data=ctx->md_data;

    if(ctx->flags&EVP_MD_CTX_FLAG_ONESHOT)
      return do_digest(md_data->sess.ses,md_data->md,data,len);

    md_data->data=OPENSSL_realloc(md_data->data,md_data->len+len);
    memcpy(md_data->data+md_data->len,data,len);
    md_data->len+=len;

    return 1;
    } 

static int dev_crypto_md5_final(EVP_MD_CTX *ctx,unsigned char *md)
    {
    int ret;
    MD_DATA *md_data=ctx->md_data;

    if(ctx->flags&EVP_MD_CTX_FLAG_ONESHOT)
      {
      memcpy(md,md_data->md,MD5_DIGEST_LENGTH);
      ret=1;
      }
    else
      {
      ret=do_digest(md_data->sess.ses,md,md_data->data,md_data->len);
      OPENSSL_free(md_data->data);
      md_data->data=NULL;
      md_data->len=0;
      }

    return ret;
    }

static int dev_crypto_md5_copy(EVP_MD_CTX *to,const EVP_MD_CTX *from)
    {
    const MD_DATA *from_md=from->md_data;
    MD_DATA *to_md=to->md_data;

    // How do we copy sessions?
    assert(from->digest->flags&EVP_MD_FLAG_ONESHOT);

    to_md->data=OPENSSL_malloc(from_md->len);
    memcpy(to_md->data,from_md->data,from_md->len);

    return 1;
    }

static int dev_crypto_md5_cleanup(EVP_MD_CTX *ctx)
    {
    return dev_crypto_cleanup_digest(ctx->md_data);
    }

static const EVP_MD md5_md=
    {
    NID_md5,
    NID_md5WithRSAEncryption,
    MD5_DIGEST_LENGTH,
    EVP_MD_FLAG_ONESHOT,      // XXX: set according to device info...
    dev_crypto_md5_init,
    dev_crypto_md5_update,
    dev_crypto_md5_final,
    dev_crypto_md5_copy,
    dev_crypto_md5_cleanup,
    EVP_PKEY_RSA_method,
    MD5_CBLOCK,
    sizeof(MD_DATA),
    };

const EVP_MD *EVP_dev_crypto_md5(void)
    { return &md5_md; }

#endif
#endif

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