205 lines
6.1 KiB
C
205 lines
6.1 KiB
C
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/* $OpenBSD: pem_seal.c,v 1.24 2017/01/29 17:49:23 beck Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <string.h>
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#include <openssl/opensslconf.h> /* for OPENSSL_NO_RSA */
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#ifndef OPENSSL_NO_RSA
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/objects.h>
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#include <openssl/pem.h>
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#include <openssl/rsa.h>
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#include <openssl/x509.h>
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static void
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PEM_ENCODE_SEAL_CTX_cleanup(PEM_ENCODE_SEAL_CTX *ctx)
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{
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EVP_CIPHER_CTX_cleanup(&ctx->cipher);
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EVP_MD_CTX_cleanup(&ctx->md);
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explicit_bzero(&ctx->encode, sizeof(ctx->encode));
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}
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int
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PEM_SealInit(PEM_ENCODE_SEAL_CTX *ctx, EVP_CIPHER *type, EVP_MD *md_type,
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unsigned char **ek, int *ekl, unsigned char *iv, EVP_PKEY **pubk, int npubk)
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{
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unsigned char key[EVP_MAX_KEY_LENGTH];
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int ret = -1;
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int i, j, max = 0;
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char *s = NULL;
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/*
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* Make sure ctx is properly initialized so that we can always pass
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* it to PEM_ENCODE_SEAL_CTX_cleanup() in the error path.
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*/
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EVP_EncodeInit(&ctx->encode);
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EVP_MD_CTX_init(&ctx->md);
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EVP_CIPHER_CTX_init(&ctx->cipher);
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for (i = 0; i < npubk; i++) {
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if (pubk[i]->type != EVP_PKEY_RSA) {
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PEMerror(PEM_R_PUBLIC_KEY_NO_RSA);
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goto err;
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}
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j = RSA_size(pubk[i]->pkey.rsa);
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if (j > max)
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max = j;
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}
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s = reallocarray(NULL, max, 2);
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if (s == NULL) {
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PEMerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EVP_SignInit(&ctx->md, md_type))
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goto err;
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ret = EVP_SealInit(&ctx->cipher, type, ek, ekl, iv, pubk, npubk);
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if (ret <= 0)
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goto err;
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/* base64 encode the keys */
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for (i = 0; i < npubk; i++) {
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j = EVP_EncodeBlock((unsigned char *)s, ek[i],
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RSA_size(pubk[i]->pkey.rsa));
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ekl[i] = j;
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memcpy(ek[i], s, j + 1);
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}
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ret = npubk;
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if (0) {
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err:
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PEM_ENCODE_SEAL_CTX_cleanup(ctx);
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}
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free(s);
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explicit_bzero(key, sizeof(key));
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return (ret);
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}
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void
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PEM_SealUpdate(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *out, int *outl,
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unsigned char *in, int inl)
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{
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unsigned char buffer[1600];
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int i, j;
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*outl = 0;
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EVP_SignUpdate(&ctx->md, in, inl);
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for (;;) {
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if (inl <= 0)
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break;
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if (inl > 1200)
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i = 1200;
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else
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i = inl;
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EVP_EncryptUpdate(&ctx->cipher, buffer, &j, in, i);
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EVP_EncodeUpdate(&ctx->encode, out, &j, buffer, j);
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*outl += j;
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out += j;
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in += i;
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inl -= i;
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}
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}
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int
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PEM_SealFinal(PEM_ENCODE_SEAL_CTX *ctx, unsigned char *sig, int *sigl,
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unsigned char *out, int *outl, EVP_PKEY *priv)
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{
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unsigned char *s = NULL;
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int ret = 0, j;
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unsigned int i;
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if (priv->type != EVP_PKEY_RSA) {
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PEMerror(PEM_R_PUBLIC_KEY_NO_RSA);
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goto err;
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}
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i = RSA_size(priv->pkey.rsa);
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if (i < 100)
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i = 100;
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s = reallocarray(NULL, i, 2);
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if (s == NULL) {
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PEMerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EVP_EncryptFinal_ex(&ctx->cipher, s, (int *)&i))
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goto err;
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EVP_EncodeUpdate(&ctx->encode, out, &j, s, i);
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*outl = j;
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out += j;
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EVP_EncodeFinal(&ctx->encode, out, &j);
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*outl += j;
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if (!EVP_SignFinal(&ctx->md, s, &i, priv))
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goto err;
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*sigl = EVP_EncodeBlock(sig, s, i);
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ret = 1;
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err:
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PEM_ENCODE_SEAL_CTX_cleanup(ctx);
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free(s);
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return (ret);
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}
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#endif
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