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pem_seal.c

/* crypto/pem/pem_seal.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.]
 */

#ifndef OPENSSL_NO_RSA
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/pem.h>

int PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
           unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk,
           int npubk)
      {
      unsigned char key[EVP_MAX_KEY_LENGTH];
      int ret= -1;
      int i,j,max=0;
      char *s=NULL;

      for (i=0; i<npubk; i++)
            {
            if (pubk[i]->type != EVP_PKEY_RSA)
                  {
                  PEMerr(PEM_F_PEM_SEALINIT,PEM_R_PUBLIC_KEY_NO_RSA);
                  goto err;
                  }
            j=RSA_size(pubk[i]->pkey.rsa);
            if (j > max) max=j;
            }
      s=(char *)OPENSSL_malloc(max*2);
      if (s == NULL)
            {
            PEMerr(PEM_F_PEM_SEALINIT,ERR_R_MALLOC_FAILURE);
            goto err;
            }

      EVP_EncodeInit(&ctx->encode);

      EVP_MD_CTX_init(&ctx->md);
      EVP_SignInit(&ctx->md,md_type);

      EVP_CIPHER_CTX_init(&ctx->cipher);
      ret=EVP_SealInit(&ctx->cipher,type,ek,ekl,iv,pubk,npubk);
      if (!ret) goto err;

      /* base64 encode the keys */
      for (i=0; i<npubk; i++)
            {
            j=EVP_EncodeBlock((unsigned char *)s,ek[i],
                  RSA_size(pubk[i]->pkey.rsa));
            ekl[i]=j;
            memcpy(ek[i],s,j+1);
            }

      ret=npubk;
err:
      if (s != NULL) OPENSSL_free(s);
      OPENSSL_cleanse(key,EVP_MAX_KEY_LENGTH);
      return(ret);
      }

void PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl,
           unsigned char *in, int inl)
      {
      unsigned char buffer[1600];
      int i,j;

      *outl=0;
      EVP_SignUpdate(&ctx->md,in,inl);
      for (;;)
            {
            if (inl <= 0) break;
            if (inl > 1200)
                  i=1200;
            else
                  i=inl;
            EVP_EncryptUpdate(&ctx->cipher,buffer,&j,in,i);
            EVP_EncodeUpdate(&ctx->encode,out,&j,buffer,j);
            *outl+=j;
            out+=j;
            in+=i;
            inl-=i;
            }
      }

int PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl,
           unsigned char *out, int *outl, EVP_PKEY *priv)
      {
      unsigned char *s=NULL;
      int ret=0,j;
      unsigned int i;

      if (priv->type != EVP_PKEY_RSA)
            {
            PEMerr(PEM_F_PEM_SEALFINAL,PEM_R_PUBLIC_KEY_NO_RSA);
            goto err;
            }
      i=RSA_size(priv->pkey.rsa);
      if (i < 100) i=100;
      s=(unsigned char *)OPENSSL_malloc(i*2);
      if (s == NULL)
            {
            PEMerr(PEM_F_PEM_SEALFINAL,ERR_R_MALLOC_FAILURE);
            goto err;
            }

      EVP_EncryptFinal_ex(&ctx->cipher,s,(int *)&i);
      EVP_EncodeUpdate(&ctx->encode,out,&j,s,i);
      *outl=j;
      out+=j;
      EVP_EncodeFinal(&ctx->encode,out,&j);
      *outl+=j;

      if (!EVP_SignFinal(&ctx->md,s,&i,priv)) goto err;
      *sigl=EVP_EncodeBlock(sig,s,i);

      ret=1;
err:
      EVP_MD_CTX_cleanup(&ctx->md);
      EVP_CIPHER_CTX_cleanup(&ctx->cipher);
      if (s != NULL) OPENSSL_free(s);
      return(ret);
      }
#else /* !OPENSSL_NO_RSA */

# if PEDANTIC
static void *dummy=&dummy;
# endif

#endif

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