-/* 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.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
- * 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.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
#include <stdio.h>
static int enc_write(BIO *h, const char *buf, int num);
static int enc_read(BIO *h, char *buf, int size);
-/*
- * static int enc_puts(BIO *h, const char *str);
- */
-/*
- * static int enc_gets(BIO *h, char *str, int size);
- */
static long enc_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int enc_new(BIO *h);
static int enc_free(BIO *data);
static long enc_callback_ctrl(BIO *h, int cmd, bio_info_cb *fps);
#define ENC_BLOCK_SIZE (1024*4)
-#define BUF_OFFSET (EVP_MAX_BLOCK_LENGTH*2)
+#define ENC_MIN_CHUNK (256)
+#define BUF_OFFSET (ENC_MIN_CHUNK + EVP_MAX_BLOCK_LENGTH)
typedef struct enc_struct {
int buf_len;
int finished;
int ok; /* bad decrypt */
EVP_CIPHER_CTX *cipher;
+ unsigned char *read_start, *read_end;
/*
* buf is larger than ENC_BLOCK_SIZE because EVP_DecryptUpdate can return
* up to a block more data than is presented to it
*/
- char buf[ENC_BLOCK_SIZE + BUF_OFFSET + 2];
+ unsigned char buf[BUF_OFFSET + ENC_BLOCK_SIZE];
} BIO_ENC_CTX;
static const BIO_METHOD methods_enc = {
BIO_TYPE_CIPHER, "cipher",
+ /* TODO: Convert to new style write function */
+ bwrite_conv,
enc_write,
+ /* TODO: Convert to new style read function */
+ bread_conv,
enc_read,
NULL, /* enc_puts, */
NULL, /* enc_gets, */
}
ctx->cont = 1;
ctx->ok = 1;
+ ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
BIO_set_data(bi, ctx);
BIO_set_init(bi, 1);
static int enc_read(BIO *b, char *out, int outl)
{
- int ret = 0, i;
+ int ret = 0, i, blocksize;
BIO_ENC_CTX *ctx;
BIO *next;
}
}
+ blocksize = EVP_CIPHER_CTX_block_size(ctx->cipher);
+ if (blocksize == 1)
+ blocksize = 0;
+
/*
* At this point, we have room of outl bytes and an empty buffer, so we
* should read in some more.
if (ctx->cont <= 0)
break;
- /*
- * read in at IV offset, read the EVP_Cipher documentation about why
- */
- i = BIO_read(next, &(ctx->buf[BUF_OFFSET]), ENC_BLOCK_SIZE);
+ if (ctx->read_start == ctx->read_end) { /* time to read more data */
+ ctx->read_end = ctx->read_start = &(ctx->buf[BUF_OFFSET]);
+ i = BIO_read(next, ctx->read_start, ENC_BLOCK_SIZE);
+ if (i > 0)
+ ctx->read_end += i;
+ } else {
+ i = ctx->read_end - ctx->read_start;
+ }
if (i <= 0) {
/* Should be continue next time we are called? */
if (!BIO_should_retry(next)) {
ctx->cont = i;
i = EVP_CipherFinal_ex(ctx->cipher,
- (unsigned char *)ctx->buf,
- &(ctx->buf_len));
+ ctx->buf, &(ctx->buf_len));
ctx->ok = i;
ctx->buf_off = 0;
} else {
break;
}
} else {
+ if (outl > ENC_MIN_CHUNK) {
+ /*
+ * Depending on flags block cipher decrypt can write
+ * one extra block and then back off, i.e. output buffer
+ * has to accommodate extra block...
+ */
+ int j = outl - blocksize, buf_len;
+
+ if (!EVP_CipherUpdate(ctx->cipher,
+ (unsigned char *)out, &buf_len,
+ ctx->read_start, i > j ? j : i)) {
+ BIO_clear_retry_flags(b);
+ return 0;
+ }
+ ret += buf_len;
+ out += buf_len;
+ outl -= buf_len;
+
+ if ((i -= j) <= 0) {
+ ctx->read_start = ctx->read_end;
+ continue;
+ }
+ ctx->read_start += j;
+ }
+ if (i > ENC_MIN_CHUNK)
+ i = ENC_MIN_CHUNK;
if (!EVP_CipherUpdate(ctx->cipher,
- (unsigned char *)ctx->buf, &ctx->buf_len,
- (unsigned char *)&(ctx->buf[BUF_OFFSET]),
- i)) {
+ ctx->buf, &ctx->buf_len,
+ ctx->read_start, i)) {
BIO_clear_retry_flags(b);
+ ctx->ok = 0;
return 0;
}
+ ctx->read_start += i;
ctx->cont = 1;
/*
* Note: it is possible for EVP_CipherUpdate to decrypt zero
while (inl > 0) {
n = (inl > ENC_BLOCK_SIZE) ? ENC_BLOCK_SIZE : inl;
if (!EVP_CipherUpdate(ctx->cipher,
- (unsigned char *)ctx->buf, &ctx->buf_len,
- (unsigned char *)in, n)) {
+ ctx->buf, &ctx->buf_len,
+ (const unsigned char *)in, n)) {
BIO_clear_retry_flags(b);
+ ctx->ok = 0;
return 0;
}
inl -= n;
return (ret);
}
-/*-
-void BIO_set_cipher_ctx(b,c)
-BIO *b;
-EVP_CIPHER_ctx *c;
- {
- if (b == NULL) return;
-
- if ((b->callback != NULL) &&
- (b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,0L) <= 0))
- return;
-
- b->init=1;
- ctx=(BIO_ENC_CTX *)b->ptr;
- memcpy(ctx->cipher,c,sizeof(EVP_CIPHER_CTX));
-
- if (b->callback != NULL)
- b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L);
- }
-*/
-
int BIO_set_cipher(BIO *b, const EVP_CIPHER *c, const unsigned char *k,
const unsigned char *i, int e)
{
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