438 lines
13 KiB
C
438 lines
13 KiB
C
/* crypto/evp/bio_enc.c */
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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 <errno.h>
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#include "cryptlib.h"
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#include <openssl/buffer.h>
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#include <openssl/evp.h>
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static int enc_write(BIO *h, const char *buf, int num);
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static int enc_read(BIO *h, char *buf, int size);
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/*
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* static int enc_puts(BIO *h, const char *str);
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*/
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/*
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* static int enc_gets(BIO *h, char *str, int size);
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*/
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static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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static int enc_new(BIO *h);
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static int enc_free(BIO *data);
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static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps);
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#define ENC_BLOCK_SIZE (1024*4)
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#define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2)
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typedef struct enc_struct {
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int buf_len;
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int buf_off;
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int cont; /* <= 0 when finished */
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int finished;
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int ok; /* bad decrypt */
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EVP_CIPHER_CTX cipher;
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/*
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* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate can return
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* up to a block more data than is presented to it
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*/
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char buf[ENC_BLOCK_SIZE + BUF_OFFSET + 2];
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} BIO_ENC_CTX;
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static BIO_METHOD methods_enc = {
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BIO_TYPE_CIPHER, "cipher",
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enc_write,
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enc_read,
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NULL, /* enc_puts, */
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NULL, /* enc_gets, */
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enc_ctrl,
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enc_new,
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enc_free,
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enc_callback_ctrl,
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};
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BIO_METHOD *BIO_f_cipher(void)
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{
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return (&methods_enc);
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}
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static int enc_new(BIO *bi)
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{
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BIO_ENC_CTX *ctx;
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ctx = (BIO_ENC_CTX *)OPENSSL_malloc(sizeof(BIO_ENC_CTX));
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if (ctx == NULL)
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return (0);
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EVP_CIPHER_CTX_init(&ctx->cipher);
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ctx->buf_len = 0;
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ctx->buf_off = 0;
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ctx->cont = 1;
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ctx->finished = 0;
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ctx->ok = 1;
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bi->init = 0;
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bi->ptr = (char *)ctx;
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bi->flags = 0;
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return (1);
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}
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static int enc_free(BIO *a)
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{
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BIO_ENC_CTX *b;
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if (a == NULL)
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return (0);
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b = (BIO_ENC_CTX *)a->ptr;
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EVP_CIPHER_CTX_cleanup(&(b->cipher));
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OPENSSL_cleanse(a->ptr, sizeof(BIO_ENC_CTX));
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OPENSSL_free(a->ptr);
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a->ptr = NULL;
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a->init = 0;
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a->flags = 0;
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return (1);
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}
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static int enc_read(BIO *b, char *out, int outl)
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{
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int ret = 0, i;
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BIO_ENC_CTX *ctx;
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if (out == NULL)
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return (0);
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ctx = (BIO_ENC_CTX *)b->ptr;
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if ((ctx == NULL) || (b->next_bio == NULL))
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return (0);
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/* First check if there are bytes decoded/encoded */
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if (ctx->buf_len > 0) {
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i = ctx->buf_len - ctx->buf_off;
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if (i > outl)
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i = outl;
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memcpy(out, &(ctx->buf[ctx->buf_off]), i);
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ret = i;
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out += i;
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outl -= i;
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ctx->buf_off += i;
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if (ctx->buf_len == ctx->buf_off) {
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ctx->buf_len = 0;
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ctx->buf_off = 0;
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}
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}
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/*
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* At this point, we have room of outl bytes and an empty buffer, so we
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* should read in some more.
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*/
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while (outl > 0) {
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if (ctx->cont <= 0)
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break;
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/*
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* read in at IV offset, read the EVP_Cipher documentation about why
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*/
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i = BIO_read(b->next_bio, &(ctx->buf[BUF_OFFSET]), ENC_BLOCK_SIZE);
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if (i <= 0) {
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/* Should be continue next time we are called? */
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if (!BIO_should_retry(b->next_bio)) {
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ctx->cont = i;
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i = EVP_CipherFinal_ex(&(ctx->cipher),
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(unsigned char *)ctx->buf,
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&(ctx->buf_len));
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ctx->ok = i;
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ctx->buf_off = 0;
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} else {
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ret = (ret == 0) ? i : ret;
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break;
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}
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} else {
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if (!EVP_CipherUpdate(&ctx->cipher,
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(unsigned char *)ctx->buf, &ctx->buf_len,
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(unsigned char *)&(ctx->buf[BUF_OFFSET]),
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i)) {
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BIO_clear_retry_flags(b);
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ctx->ok = 0;
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return 0;
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}
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ctx->cont = 1;
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/*
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* Note: it is possible for EVP_CipherUpdate to decrypt zero
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* bytes because this is or looks like the final block: if this
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* happens we should retry and either read more data or decrypt
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* the final block
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*/
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if (ctx->buf_len == 0)
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continue;
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}
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if (ctx->buf_len <= outl)
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i = ctx->buf_len;
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else
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i = outl;
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if (i <= 0)
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break;
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memcpy(out, ctx->buf, i);
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ret += i;
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ctx->buf_off = i;
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outl -= i;
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out += i;
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}
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BIO_clear_retry_flags(b);
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BIO_copy_next_retry(b);
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return ((ret == 0) ? ctx->cont : ret);
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}
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static int enc_write(BIO *b, const char *in, int inl)
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{
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int ret = 0, n, i;
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BIO_ENC_CTX *ctx;
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ctx = (BIO_ENC_CTX *)b->ptr;
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ret = inl;
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BIO_clear_retry_flags(b);
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n = ctx->buf_len - ctx->buf_off;
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while (n > 0) {
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i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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return (i);
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}
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ctx->buf_off += i;
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n -= i;
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}
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/* at this point all pending data has been written */
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if ((in == NULL) || (inl <= 0))
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return (0);
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ctx->buf_off = 0;
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while (inl > 0) {
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n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl;
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if (!EVP_CipherUpdate(&ctx->cipher,
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(unsigned char *)ctx->buf, &ctx->buf_len,
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(unsigned char *)in, n)) {
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BIO_clear_retry_flags(b);
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ctx->ok = 0;
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return 0;
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}
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inl -= n;
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in += n;
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ctx->buf_off = 0;
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n = ctx->buf_len;
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while (n > 0) {
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i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
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if (i <= 0) {
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BIO_copy_next_retry(b);
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return (ret == inl) ? i : ret - inl;
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}
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n -= i;
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ctx->buf_off += i;
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}
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ctx->buf_len = 0;
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ctx->buf_off = 0;
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}
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BIO_copy_next_retry(b);
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return (ret);
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}
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static long enc_ctrl(BIO *b, int cmd, long num, void *ptr)
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{
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BIO *dbio;
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BIO_ENC_CTX *ctx, *dctx;
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long ret = 1;
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int i;
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EVP_CIPHER_CTX **c_ctx;
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ctx = (BIO_ENC_CTX *)b->ptr;
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switch (cmd) {
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case BIO_CTRL_RESET:
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ctx->ok = 1;
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ctx->finished = 0;
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EVP_CipherInit_ex(&(ctx->cipher), NULL, NULL, NULL, NULL,
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ctx->cipher.encrypt);
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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case BIO_CTRL_EOF: /* More to read */
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if (ctx->cont <= 0)
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ret = 1;
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else
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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case BIO_CTRL_WPENDING:
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ret = ctx->buf_len - ctx->buf_off;
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if (ret <= 0)
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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case BIO_CTRL_PENDING: /* More to read in buffer */
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ret = ctx->buf_len - ctx->buf_off;
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if (ret <= 0)
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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case BIO_CTRL_FLUSH:
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/* do a final write */
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again:
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while (ctx->buf_len != ctx->buf_off) {
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i = enc_write(b, NULL, 0);
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if (i < 0)
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return i;
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}
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if (!ctx->finished) {
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ctx->finished = 1;
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ctx->buf_off = 0;
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ret = EVP_CipherFinal_ex(&(ctx->cipher),
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(unsigned char *)ctx->buf,
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&(ctx->buf_len));
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ctx->ok = (int)ret;
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if (ret <= 0)
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break;
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/* push out the bytes */
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goto again;
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}
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/* Finally flush the underlying BIO */
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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case BIO_C_GET_CIPHER_STATUS:
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ret = (long)ctx->ok;
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break;
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case BIO_C_DO_STATE_MACHINE:
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BIO_clear_retry_flags(b);
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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BIO_copy_next_retry(b);
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break;
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case BIO_C_GET_CIPHER_CTX:
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c_ctx = (EVP_CIPHER_CTX **)ptr;
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(*c_ctx) = &(ctx->cipher);
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b->init = 1;
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break;
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case BIO_CTRL_DUP:
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dbio = (BIO *)ptr;
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dctx = (BIO_ENC_CTX *)dbio->ptr;
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EVP_CIPHER_CTX_init(&dctx->cipher);
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ret = EVP_CIPHER_CTX_copy(&dctx->cipher, &ctx->cipher);
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if (ret)
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dbio->init = 1;
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break;
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default:
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ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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break;
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}
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return (ret);
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}
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static long enc_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
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{
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long ret = 1;
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if (b->next_bio == NULL)
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return (0);
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switch (cmd) {
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default:
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ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
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break;
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}
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return (ret);
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}
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/*-
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void BIO_set_cipher_ctx(b,c)
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BIO *b;
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EVP_CIPHER_ctx *c;
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{
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if (b == NULL) return;
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if ((b->callback != NULL) &&
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(b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
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return;
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b->init=1;
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ctx=(BIO_ENC_CTX *)b->ptr;
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memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
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if (b->callback != NULL)
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b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
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}
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*/
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void BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k,
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const unsigned char *i, int e)
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{
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BIO_ENC_CTX *ctx;
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if (b == NULL)
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return;
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if ((b->callback != NULL) &&
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(b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 0L) <=
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0))
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return;
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b->init = 1;
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ctx = (BIO_ENC_CTX *)b->ptr;
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EVP_CipherInit_ex(&(ctx->cipher), c, NULL, k, i, e);
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if (b->callback != NULL)
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b->callback(b, BIO_CB_CTRL, (const char *)c, BIO_CTRL_SET, e, 1L);
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}
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