crypto/pem/pem_seal.c - third_party/openssl - Git at Google

 /* 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.]
  */

 #include <openssl/opensslconf.h> /* for OPENSSL_NO_RSA */
 #ifndef OPENSSL_NO_RSA
 # include <stdio.h>
 # include "internal/cryptlib.h"
 # include <openssl/evp.h>
 # include <openssl/rand.h>
 # include <openssl/objects.h>
 # include <openssl/x509.h>
 # include <openssl/pem.h>
 # include <openssl/rsa.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 = 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);
     if (!EVP_SignInit(&ctx->md, md_type))
         goto err;

     EVP_CIPHER_CTX_init(&ctx->cipher);
     ret = EVP_SealInit(&ctx->cipher, type, ek, ekl, iv, pubk, npubk);
     if (ret <= 0)
         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:
     OPENSSL_free(s);
     OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
     return (ret);
 }

 int 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;
     if (!EVP_SignUpdate(&ctx->md, in, inl))
         return 0;
     for (;;) {
         if (inl <= 0)
             break;
         if (inl > 1200)
             i = 1200;
         else
             i = inl;
         if (!EVP_EncryptUpdate(&ctx->cipher, buffer, &j, in, i))
             return 0;
         EVP_EncodeUpdate(&ctx->encode, out, &j, buffer, j);
         *outl += j;
         out += j;
         in += i;
         inl -= i;
     }
     return 1;
 }

 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 = OPENSSL_malloc(i * 2);
     if (s == NULL) {
         PEMerr(PEM_F_PEM_SEALFINAL, ERR_R_MALLOC_FAILURE);
         goto err;
     }

     if (!EVP_EncryptFinal_ex(&ctx->cipher, s, (int *)&i))
         goto err;
     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);
     OPENSSL_free(s);
     return (ret);
 }
 #else                           /* !OPENSSL_NO_RSA */

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

 #endif
	/* 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.]
	*/

	#include <openssl/opensslconf.h> /* for OPENSSL_NO_RSA */
	#ifndef OPENSSL_NO_RSA
	# include <stdio.h>
	# include "internal/cryptlib.h"
	# include <openssl/evp.h>
	# include <openssl/rand.h>
	# include <openssl/objects.h>
	# include <openssl/x509.h>
	# include <openssl/pem.h>
	# include <openssl/rsa.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 = 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);
	if (!EVP_SignInit(&ctx->md, md_type))
	goto err;

	EVP_CIPHER_CTX_init(&ctx->cipher);
	ret = EVP_SealInit(&ctx->cipher, type, ek, ekl, iv, pubk, npubk);
	if (ret <= 0)
	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:
	OPENSSL_free(s);
	OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
	return (ret);
	}

	int 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;
	if (!EVP_SignUpdate(&ctx->md, in, inl))
	return 0;
	for (;;) {
	if (inl <= 0)
	break;
	if (inl > 1200)
	i = 1200;
	else
	i = inl;
	if (!EVP_EncryptUpdate(&ctx->cipher, buffer, &j, in, i))
	return 0;
	EVP_EncodeUpdate(&ctx->encode, out, &j, buffer, j);
	*outl += j;
	out += j;
	in += i;
	inl -= i;
	}
	return 1;
	}

	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 = OPENSSL_malloc(i * 2);
	if (s == NULL) {
	PEMerr(PEM_F_PEM_SEALFINAL, ERR_R_MALLOC_FAILURE);
	goto err;
	}

	if (!EVP_EncryptFinal_ex(&ctx->cipher, s, (int *)&i))
	goto err;
	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);
	OPENSSL_free(s);
	return (ret);
	}
	#else /* !OPENSSL_NO_RSA */

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

	#endif