ref: 464763202be7bdafa703c8c2ecfe1f4a5142f26f
dir: /sys/src/ape/lib/openssl/crypto/pem/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.]
*/
#include <openssl/opensslconf.h> /* for OPENSSL_NO_RSA */
#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>
#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=(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