Delete bundled copy of OpenSSL and replace with README.

openssl/crypto/evp/bio_ok.c

Index: openssl/crypto/evp/bio_ok.c
diff --git a/openssl/crypto/evp/bio_ok.c b/openssl/crypto/evp/bio_ok.c
deleted file mode 100644
index e64335353fd51af6eafb4ee21696626fc3c06d88..0000000000000000000000000000000000000000
--- a/openssl/crypto/evp/bio_ok.c
+++ /dev/null
@@ -1,624 +0,0 @@
-/* crypto/evp/bio_ok.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.]
- */
-
-/*
-	From: Arne Ansper <arne@cyber.ee>
-
-	Why BIO_f_reliable?
-
-	I wrote function which took BIO* as argument, read data from it
-	and processed it. Then I wanted to store the input file in 
-	encrypted form. OK I pushed BIO_f_cipher to the BIO stack
-	and everything was OK. BUT if user types wrong password 
-	BIO_f_cipher outputs only garbage and my function crashes. Yes
-	I can and I should fix my function, but BIO_f_cipher is 
-	easy way to add encryption support to many existing applications
-	and it's hard to debug and fix them all. 
-
-	So I wanted another BIO which would catch the incorrect passwords and
-	file damages which cause garbage on BIO_f_cipher's output. 
-
-	The easy way is to push the BIO_f_md and save the checksum at 
-	the end of the file. However there are several problems with this
-	approach:
-
-	1) you must somehow separate checksum from actual data. 
-	2) you need lot's of memory when reading the file, because you 
-	must read to the end of the file and verify the checksum before
-	letting the application to read the data. 
-	
-	BIO_f_reliable tries to solve both problems, so that you can 
-	read and write arbitrary long streams using only fixed amount
-	of memory.
-
-	BIO_f_reliable splits data stream into blocks. Each block is prefixed
-	with it's length and suffixed with it's digest. So you need only 
-	several Kbytes of memory to buffer single block before verifying 
-	it's digest. 
-
-	BIO_f_reliable goes further and adds several important capabilities:
-
-	1) the digest of the block is computed over the whole stream 
-	-- so nobody can rearrange the blocks or remove or replace them.
-
-	2) to detect invalid passwords right at the start BIO_f_reliable 
-	adds special prefix to the stream. In order to avoid known plain-text
-	attacks this prefix is generated as follows:
-
-		*) digest is initialized with random seed instead of 
-		standardized one.
-		*) same seed is written to output
-		*) well-known text is then hashed and the output 
-		of the digest is also written to output.
-
-	reader can now read the seed from stream, hash the same string
-	and then compare the digest output.
-
-	Bad things: BIO_f_reliable knows what's going on in EVP_Digest. I 
-	initially wrote and tested this code on x86 machine and wrote the
-	digests out in machine-dependent order :( There are people using
-	this code and I cannot change this easily without making existing
-	data files unreadable.
-
-*/
-
-#include <stdio.h>
-#include <errno.h>
-#include <assert.h>
-#include "cryptlib.h"
-#include <openssl/buffer.h>
-#include <openssl/bio.h>
-#include <openssl/evp.h>
-#include <openssl/rand.h>
-
-static int ok_write(BIO *h, const char *buf, int num);
-static int ok_read(BIO *h, char *buf, int size);
-static long ok_ctrl(BIO *h, int cmd, long arg1, void *arg2);
-static int ok_new(BIO *h);
-static int ok_free(BIO *data);
-static long ok_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
-
-static int sig_out(BIO* b);
-static int sig_in(BIO* b);
-static int block_out(BIO* b);
-static int block_in(BIO* b);
-#define OK_BLOCK_SIZE	(1024*4)
-#define OK_BLOCK_BLOCK	4
-#define IOBS		(OK_BLOCK_SIZE+ OK_BLOCK_BLOCK+ 3*EVP_MAX_MD_SIZE)
-#define WELLKNOWN "The quick brown fox jumped over the lazy dog's back."
-
-typedef struct ok_struct
-	{
-	size_t buf_len;
-	size_t buf_off;
-	size_t buf_len_save;
-	size_t buf_off_save;
-	int cont;		/* <= 0 when finished */
-	int finished;
-	EVP_MD_CTX md;
-	int blockout;		/* output block is ready */ 
-	int sigio;		/* must process signature */
-	unsigned char buf[IOBS];
-	} BIO_OK_CTX;
-
-static BIO_METHOD methods_ok=
-	{
-	BIO_TYPE_CIPHER,"reliable",
-	ok_write,
-	ok_read,
-	NULL, /* ok_puts, */
-	NULL, /* ok_gets, */
-	ok_ctrl,
-	ok_new,
-	ok_free,
-	ok_callback_ctrl,
-	};
-
-BIO_METHOD *BIO_f_reliable(void)
-	{
-	return(&methods_ok);
-	}
-
-static int ok_new(BIO *bi)
-	{
-	BIO_OK_CTX *ctx;
-
-	ctx=(BIO_OK_CTX *)OPENSSL_malloc(sizeof(BIO_OK_CTX));
-	if (ctx == NULL) return(0);
-
-	ctx->buf_len=0;
-	ctx->buf_off=0;
-	ctx->buf_len_save=0;
-	ctx->buf_off_save=0;
-	ctx->cont=1;
-	ctx->finished=0;
-	ctx->blockout= 0;
-	ctx->sigio=1;
-
-	EVP_MD_CTX_init(&ctx->md);
-
-	bi->init=0;
-	bi->ptr=(char *)ctx;
-	bi->flags=0;
-	return(1);
-	}
-
-static int ok_free(BIO *a)
-	{
-	if (a == NULL) return(0);
-	EVP_MD_CTX_cleanup(&((BIO_OK_CTX *)a->ptr)->md);
-	OPENSSL_cleanse(a->ptr,sizeof(BIO_OK_CTX));
-	OPENSSL_free(a->ptr);
-	a->ptr=NULL;
-	a->init=0;
-	a->flags=0;
-	return(1);
-	}
-	
-static int ok_read(BIO *b, char *out, int outl)
-	{
-	int ret=0,i,n;
-	BIO_OK_CTX *ctx;
-
-	if (out == NULL) return(0);
-	ctx=(BIO_OK_CTX *)b->ptr;
-
-	if ((ctx == NULL) || (b->next_bio == NULL) || (b->init == 0)) return(0);
-
-	while(outl > 0)
-		{
-
-		/* copy clean bytes to output buffer */
-		if (ctx->blockout)
-			{
-			i=ctx->buf_len-ctx->buf_off;
-			if (i > outl) i=outl;
-			memcpy(out,&(ctx->buf[ctx->buf_off]),i);
-			ret+=i;
-			out+=i;
-			outl-=i;
-			ctx->buf_off+=i;
-
-			/* all clean bytes are out */
-			if (ctx->buf_len == ctx->buf_off)
-				{
-				ctx->buf_off=0;
-
-				/* copy start of the next block into proper place */
-				if(ctx->buf_len_save- ctx->buf_off_save > 0)
-					{
-					ctx->buf_len= ctx->buf_len_save- ctx->buf_off_save;
-					memmove(ctx->buf, &(ctx->buf[ctx->buf_off_save]),
-							ctx->buf_len);
-					}
-				else
-					{
-					ctx->buf_len=0;
-					}
-				ctx->blockout= 0;
-				}
-			}
-	
-		/* output buffer full -- cancel */
-		if (outl == 0) break;
-
-		/* no clean bytes in buffer -- fill it */
-		n=IOBS- ctx->buf_len;
-		i=BIO_read(b->next_bio,&(ctx->buf[ctx->buf_len]),n);
-
-		if (i <= 0) break;	/* nothing new */
-
-		ctx->buf_len+= i;
-
-		/* no signature yet -- check if we got one */
-		if (ctx->sigio == 1)
-			{
-			if (!sig_in(b))
-				{
-				BIO_clear_retry_flags(b);
-				return 0;
-				}
-			}
-
-		/* signature ok -- check if we got block */
-		if (ctx->sigio == 0)
-			{
-			if (!block_in(b))
-				{
-				BIO_clear_retry_flags(b);
-				return 0;
-				}
-			}
-
-		/* invalid block -- cancel */
-		if (ctx->cont <= 0) break;
-
-		}
-
-	BIO_clear_retry_flags(b);
-	BIO_copy_next_retry(b);
-	return(ret);
-	}
-
-static int ok_write(BIO *b, const char *in, int inl)
-	{
-	int ret=0,n,i;
-	BIO_OK_CTX *ctx;
-
-	if (inl <= 0) return inl;
-
-	ctx=(BIO_OK_CTX *)b->ptr;
-	ret=inl;
-
-	if ((ctx == NULL) || (b->next_bio == NULL) || (b->init == 0)) return(0);
-
-	if(ctx->sigio && !sig_out(b))
-		return 0;
-
-	do{
-		BIO_clear_retry_flags(b);
-		n=ctx->buf_len-ctx->buf_off;
-		while (ctx->blockout && n > 0)
-			{
-			i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
-			if (i <= 0)
-				{
-				BIO_copy_next_retry(b);
-				if(!BIO_should_retry(b))
-					ctx->cont= 0;
-				return(i);
-				}
-			ctx->buf_off+=i;
-			n-=i;
-			}
-
-		/* at this point all pending data has been written */
-		ctx->blockout= 0;
-		if (ctx->buf_len == ctx->buf_off)
-			{
-			ctx->buf_len=OK_BLOCK_BLOCK;
-			ctx->buf_off=0;
-			}
-	
-		if ((in == NULL) || (inl <= 0)) return(0);
-
-		n= (inl+ ctx->buf_len > OK_BLOCK_SIZE+ OK_BLOCK_BLOCK) ? 
-			(int)(OK_BLOCK_SIZE+OK_BLOCK_BLOCK-ctx->buf_len) : inl;
-
-		memcpy((unsigned char *)(&(ctx->buf[ctx->buf_len])),(unsigned char *)in,n);
-		ctx->buf_len+= n;
-		inl-=n;
-		in+=n;
-
-		if(ctx->buf_len >= OK_BLOCK_SIZE+ OK_BLOCK_BLOCK)
-			{
-			if (!block_out(b))
-				{
-				BIO_clear_retry_flags(b);
-				return 0;
-				}
-			}
-	}while(inl > 0);
-
-	BIO_clear_retry_flags(b);
-	BIO_copy_next_retry(b);
-	return(ret);
-	}
-
-static long ok_ctrl(BIO *b, int cmd, long num, void *ptr)
-	{
-	BIO_OK_CTX *ctx;
-	EVP_MD *md;
-	const EVP_MD **ppmd;
-	long ret=1;
-	int i;
-
-	ctx=b->ptr;
-
-	switch (cmd)
-		{
-	case BIO_CTRL_RESET:
-		ctx->buf_len=0;
-		ctx->buf_off=0;
-		ctx->buf_len_save=0;
-		ctx->buf_off_save=0;
-		ctx->cont=1;
-		ctx->finished=0;
-		ctx->blockout= 0;
-		ctx->sigio=1;
-		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
-		break;
-	case BIO_CTRL_EOF:	/* More to read */
-		if (ctx->cont <= 0)
-			ret=1;
-		else
-			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
-		break;
-	case BIO_CTRL_PENDING: /* More to read in buffer */
-	case BIO_CTRL_WPENDING: /* More to read in buffer */
-		ret=ctx->blockout ? ctx->buf_len-ctx->buf_off : 0;
-		if (ret <= 0)
-			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
-		break;
-	case BIO_CTRL_FLUSH:
-		/* do a final write */
-		if(ctx->blockout == 0)
-			if (!block_out(b))
-				return 0;
-
-		while (ctx->blockout)
-			{
-			i=ok_write(b,NULL,0);
-			if (i < 0)
-				{
-				ret=i;
-				break;
-				}
-			}
-
-		ctx->finished=1;
-		ctx->buf_off=ctx->buf_len=0;
-		ctx->cont=(int)ret;
-		
-		/* Finally flush the underlying BIO */
-		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
-		break;
-	case BIO_C_DO_STATE_MACHINE:
-		BIO_clear_retry_flags(b);
-		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
-		BIO_copy_next_retry(b);
-		break;
-	case BIO_CTRL_INFO:
-		ret=(long)ctx->cont;
-		break;
-	case BIO_C_SET_MD:
-		md=ptr;
-		if (!EVP_DigestInit_ex(&ctx->md, md, NULL))
-			return 0;
-		b->init=1;
-		break;
-	case BIO_C_GET_MD:
-		if (b->init)
-			{
-			ppmd=ptr;
-			*ppmd=ctx->md.digest;
-			}
-		else
-			ret=0;
-		break;
-	default:
-		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
-		break;
-		}
-	return(ret);
-	}
-
-static long ok_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
-	{
-	long ret=1;
-
-	if (b->next_bio == NULL) return(0);
-	switch (cmd)
-		{
-	default:
-		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
-		break;
-		}
-	return(ret);
-	}
-
-static void longswap(void *_ptr, size_t len)
-{	const union { long one; char little; } is_endian = {1};
-
-	if (is_endian.little) {
-		size_t i;
-		unsigned char *p=_ptr,c;
-
-		for(i= 0;i < len;i+= 4) {
-			c=p[0],p[0]=p[3],p[3]=c;
-			c=p[1],p[1]=p[2],p[2]=c;
-		}
-	}
-}
-
-static int sig_out(BIO* b)
-	{
-	BIO_OK_CTX *ctx;
-	EVP_MD_CTX *md;
-
-	ctx=b->ptr;
-	md=&ctx->md;
-
-	if(ctx->buf_len+ 2* md->digest->md_size > OK_BLOCK_SIZE) return 1;
-
-	if (!EVP_DigestInit_ex(md, md->digest, NULL))
-		goto berr;
-	/* FIXME: there's absolutely no guarantee this makes any sense at all,
-	 * particularly now EVP_MD_CTX has been restructured.
-	 */
-	RAND_pseudo_bytes(md->md_data, md->digest->md_size);
-	memcpy(&(ctx->buf[ctx->buf_len]), md->md_data, md->digest->md_size);
-	longswap(&(ctx->buf[ctx->buf_len]), md->digest->md_size);
-	ctx->buf_len+= md->digest->md_size;
-
-	if (!EVP_DigestUpdate(md, WELLKNOWN, strlen(WELLKNOWN)))
-		goto berr;
-	if (!EVP_DigestFinal_ex(md, &(ctx->buf[ctx->buf_len]), NULL))
-		goto berr;
-	ctx->buf_len+= md->digest->md_size;
-	ctx->blockout= 1;
-	ctx->sigio= 0;
-	return 1;
-	berr:
-	BIO_clear_retry_flags(b);
-	return 0;
-	}
-
-static int sig_in(BIO* b)
-	{
-	BIO_OK_CTX *ctx;
-	EVP_MD_CTX *md;
-	unsigned char tmp[EVP_MAX_MD_SIZE];
-	int ret= 0;
-
-	ctx=b->ptr;
-	md=&ctx->md;
-
-	if((int)(ctx->buf_len-ctx->buf_off) < 2*md->digest->md_size) return 1;
-
-	if (!EVP_DigestInit_ex(md, md->digest, NULL))
-		goto berr;
-	memcpy(md->md_data, &(ctx->buf[ctx->buf_off]), md->digest->md_size);
-	longswap(md->md_data, md->digest->md_size);
-	ctx->buf_off+= md->digest->md_size;
-
-	if (!EVP_DigestUpdate(md, WELLKNOWN, strlen(WELLKNOWN)))
-		goto berr;
-	if (!EVP_DigestFinal_ex(md, tmp, NULL))
-		goto berr;
-	ret= memcmp(&(ctx->buf[ctx->buf_off]), tmp, md->digest->md_size) == 0;
-	ctx->buf_off+= md->digest->md_size;
-	if(ret == 1)
-		{
-		ctx->sigio= 0;
-		if(ctx->buf_len != ctx->buf_off)
-			{
-			memmove(ctx->buf, &(ctx->buf[ctx->buf_off]), ctx->buf_len- ctx->buf_off);
-			}
-		ctx->buf_len-= ctx->buf_off;
-		ctx->buf_off= 0;
-		}
-	else
-		{
-		ctx->cont= 0;
-		}
-	return 1;
-	berr:
-	BIO_clear_retry_flags(b);
-	return 0;
-	}
-
-static int block_out(BIO* b)
-	{
-	BIO_OK_CTX *ctx;
-	EVP_MD_CTX *md;
-	unsigned long tl;
-
-	ctx=b->ptr;
-	md=&ctx->md;
-
-	tl= ctx->buf_len- OK_BLOCK_BLOCK;
-	ctx->buf[0]=(unsigned char)(tl>>24);
-	ctx->buf[1]=(unsigned char)(tl>>16);
-	ctx->buf[2]=(unsigned char)(tl>>8);
-	ctx->buf[3]=(unsigned char)(tl);
-	if (!EVP_DigestUpdate(md,
-		(unsigned char*) &(ctx->buf[OK_BLOCK_BLOCK]), tl))
-		goto berr;
-	if (!EVP_DigestFinal_ex(md, &(ctx->buf[ctx->buf_len]), NULL))
-		goto berr;
-	ctx->buf_len+= md->digest->md_size;
-	ctx->blockout= 1;
-	return 1;
-	berr:
-	BIO_clear_retry_flags(b);
-	return 0;
-	}
-
-static int block_in(BIO* b)
-	{
-	BIO_OK_CTX *ctx;
-	EVP_MD_CTX *md;
-	unsigned long tl= 0;
-	unsigned char tmp[EVP_MAX_MD_SIZE];
-
-	ctx=b->ptr;
-	md=&ctx->md;
-
-	assert(sizeof(tl)>=OK_BLOCK_BLOCK);	/* always true */
-	tl =ctx->buf[0]; tl<<=8;
-	tl|=ctx->buf[1]; tl<<=8;
-	tl|=ctx->buf[2]; tl<<=8;
-	tl|=ctx->buf[3];
-
-	if (ctx->buf_len < tl+ OK_BLOCK_BLOCK+ md->digest->md_size) return 1;
- 
-	if (!EVP_DigestUpdate(md,
-			(unsigned char*) &(ctx->buf[OK_BLOCK_BLOCK]), tl))
-		goto berr;
-	if (!EVP_DigestFinal_ex(md, tmp, NULL))
-		goto berr;
-	if(memcmp(&(ctx->buf[tl+ OK_BLOCK_BLOCK]), tmp, md->digest->md_size) == 0)
-		{
-		/* there might be parts from next block lurking around ! */
-		ctx->buf_off_save= tl+ OK_BLOCK_BLOCK+ md->digest->md_size;
-		ctx->buf_len_save= ctx->buf_len;
-		ctx->buf_off= OK_BLOCK_BLOCK;
-		ctx->buf_len= tl+ OK_BLOCK_BLOCK;
-		ctx->blockout= 1;
-		}
-	else
-		{
-		ctx->cont= 0;
-		}
-	return 1;
-	berr:
-	BIO_clear_retry_flags(b);
-	return 0;
-	}
-