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enc_min.c

/* crypto/evp/enc_min.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif
#include "evp_locl.h"

void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
      {
#ifdef OPENSSL_FIPS
      FIPS_selftest_check();
#endif
      memset(ctx,0,sizeof(EVP_CIPHER_CTX));
      /* ctx->cipher=NULL; */
      }

#ifdef OPENSSL_FIPS

/* The purpose of these is to trap programs that attempt to use non FIPS
 * algorithms in FIPS mode and ignore the errors.
 */

static int bad_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                const unsigned char *iv, int enc)
      { FIPS_ERROR_IGNORED("Cipher init"); return 0;}

static int bad_do_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                   const unsigned char *in, unsigned int inl)
      { FIPS_ERROR_IGNORED("Cipher update"); return 0;}

/* NB: no cleanup because it is allowed after failed init */

static int bad_set_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
      { FIPS_ERROR_IGNORED("Cipher set_asn1"); return 0;}
static int bad_get_asn1(EVP_CIPHER_CTX *ctx, ASN1_TYPE *typ)
      { FIPS_ERROR_IGNORED("Cipher get_asn1"); return 0;}
static int bad_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
      { FIPS_ERROR_IGNORED("Cipher ctrl"); return 0;}

static const EVP_CIPHER bad_cipher =
      {
      0,
      0,
      0,
      0,
      0,
      bad_init,
      bad_do_cipher,
      NULL,
      0,
      bad_set_asn1,
      bad_get_asn1,
      bad_ctrl,
      NULL
      };

#endif

#ifndef OPENSSL_NO_ENGINE

#ifdef OPENSSL_FIPS

static int do_engine_null(ENGINE *impl) { return 0;}
static int do_evp_enc_engine_null(EVP_CIPHER_CTX *ctx,
                        const EVP_CIPHER **pciph, ENGINE *impl)
      { return 1; }

static int (*do_engine_finish)(ENGINE *impl)
            = do_engine_null;

static int (*do_evp_enc_engine)
      (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl)
            = do_evp_enc_engine_null;

void int_EVP_CIPHER_set_engine_callbacks(
      int (*eng_ciph_fin)(ENGINE *impl),
      int (*eng_ciph_evp)
            (EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pciph, ENGINE *impl))
      {
      do_engine_finish = eng_ciph_fin;
      do_evp_enc_engine = eng_ciph_evp;
      }

#else

#define do_engine_finish ENGINE_finish

static int do_evp_enc_engine(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl)
      {
      if(impl)
            {
            if (!ENGINE_init(impl))
                  {
                  EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR);
                  return 0;
                  }
            }
      else
            /* Ask if an ENGINE is reserved for this job */
            impl = ENGINE_get_cipher_engine((*pcipher)->nid);
      if(impl)
            {
            /* There's an ENGINE for this job ... (apparently) */
            const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid);
            if(!c)
                  {
                  /* One positive side-effect of US's export
                   * control history, is that we should at least
                   * be able to avoid using US mispellings of
                   * "initialisation"? */
                  EVPerr(EVP_F_DO_EVP_ENC_ENGINE, EVP_R_INITIALIZATION_ERROR);
                  return 0;
                  }
            /* We'll use the ENGINE's private cipher definition */
            *pcipher = c;
            /* Store the ENGINE functional reference so we know
             * 'cipher' came from an ENGINE and we need to release
             * it when done. */
            ctx->engine = impl;
            }
      else
            ctx->engine = NULL;
      return 1;
      }

#endif

#endif

int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
           const unsigned char *key, const unsigned char *iv, int enc)
      {
      if (enc == -1)
            enc = ctx->encrypt;
      else
            {
            if (enc)
                  enc = 1;
            ctx->encrypt = enc;
            }
#ifdef OPENSSL_FIPS
      if(FIPS_selftest_failed())
            {
            FIPSerr(FIPS_F_EVP_CIPHERINIT_EX,FIPS_R_FIPS_SELFTEST_FAILED);
            ctx->cipher = &bad_cipher;
            return 0;
            }
#endif
#ifndef OPENSSL_NO_ENGINE
      /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
       * so this context may already have an ENGINE! Try to avoid releasing
       * the previous handle, re-querying for an ENGINE, and having a
       * reinitialisation, when it may all be unecessary. */
      if (ctx->engine && ctx->cipher && (!cipher ||
                  (cipher && (cipher->nid == ctx->cipher->nid))))
            goto skip_to_init;
#endif
      if (cipher)
            {
            /* Ensure a context left lying around from last time is cleared
             * (the previous check attempted to avoid this if the same
             * ENGINE and EVP_CIPHER could be used). */
            EVP_CIPHER_CTX_cleanup(ctx);

            /* Restore encrypt field: it is zeroed by cleanup */
            ctx->encrypt = enc;
#ifndef OPENSSL_NO_ENGINE
            if (!do_evp_enc_engine(ctx, &cipher, impl))
                  return 0;
#endif

            ctx->cipher=cipher;
            if (ctx->cipher->ctx_size)
                  {
                  ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
                  if (!ctx->cipher_data)
                        {
                        EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
                        return 0;
                        }
                  }
            else
                  {
                  ctx->cipher_data = NULL;
                  }
            ctx->key_len = cipher->key_len;
            ctx->flags = 0;
            if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
                  {
                  if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
                        {
                        EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
                        return 0;
                        }
                  }
            }
      else if(!ctx->cipher)
            {
            EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
            return 0;
            }
#ifndef OPENSSL_NO_ENGINE
skip_to_init:
#endif
      /* we assume block size is a power of 2 in *cryptUpdate */
      OPENSSL_assert(ctx->cipher->block_size == 1
          || ctx->cipher->block_size == 8
          || ctx->cipher->block_size == 16);

      if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
            switch(EVP_CIPHER_CTX_mode(ctx)) {

                  case EVP_CIPH_STREAM_CIPHER:
                  case EVP_CIPH_ECB_MODE:
                  break;

                  case EVP_CIPH_CFB_MODE:
                  case EVP_CIPH_OFB_MODE:

                  ctx->num = 0;

                  case EVP_CIPH_CBC_MODE:

                  OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
                              (int)sizeof(ctx->iv));
                  if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
                  memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
                  break;

                  default:
                  return 0;
                  break;
            }
      }

#ifdef OPENSSL_FIPS
      /* After 'key' is set no further parameters changes are permissible.
       * So only check for non FIPS enabling at this point.
       */
      if (key && FIPS_mode())
            {
            if (!(ctx->cipher->flags & EVP_CIPH_FLAG_FIPS)
                  & !(ctx->flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW))
                  {
                  EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_DISABLED_FOR_FIPS);
#if 0
                  ERR_add_error_data(2, "cipher=",
                                    EVP_CIPHER_name(ctx->cipher));
#endif
                  ctx->cipher = &bad_cipher;
                  return 0;
                  }
            }
#endif

      if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
            if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
      }
      ctx->buf_len=0;
      ctx->final_used=0;
      ctx->block_mask=ctx->cipher->block_size-1;
      return 1;
      }

int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
      {
      if (c->cipher != NULL)
            {
            if(c->cipher->cleanup && !c->cipher->cleanup(c))
                  return 0;
            /* Cleanse cipher context data */
            if (c->cipher_data)
                  OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
            }
      if (c->cipher_data)
            OPENSSL_free(c->cipher_data);
#ifndef OPENSSL_NO_ENGINE
      if (c->engine)
            /* The EVP_CIPHER we used belongs to an ENGINE, release the
             * functional reference we held for this reason. */
            do_engine_finish(c->engine);
#endif
      memset(c,0,sizeof(EVP_CIPHER_CTX));
      return 1;
      }

int EVP_Cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, unsigned int inl)
      {
#ifdef OPENSSL_FIPS
      FIPS_selftest_check();
#endif
      return ctx->cipher->do_cipher(ctx,out,in,inl);
      }

int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
      int ret;
      if(!ctx->cipher) {
            EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
            return 0;
      }

      if(!ctx->cipher->ctrl) {
            EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
            return 0;
      }

      ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
      if(ret == -1) {
            EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
            return 0;
      }
      return ret;
}

unsigned long EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx)
      {
      return ctx->cipher->flags;
      }

int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx)
      {
      return ctx->cipher->iv_len;
      }

int EVP_CIPHER_nid(const EVP_CIPHER *cipher)
      {
      return cipher->nid;
      }

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