/* 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