diff options
Diffstat (limited to 'openssl/crypto/evp/bio_ok.c')
| -rw-r--r-- | openssl/crypto/evp/bio_ok.c | 575 |
1 files changed, 0 insertions, 575 deletions
diff --git a/openssl/crypto/evp/bio_ok.c b/openssl/crypto/evp/bio_ok.c deleted file mode 100644 index 98bc1ab4..00000000 --- a/openssl/crypto/evp/bio_ok.c +++ /dev/null @@ -1,575 +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 void sig_out(BIO* b); -static void sig_in(BIO* b); -static void block_out(BIO* b); -static void 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) sig_in(b); - - /* signature ok -- check if we got block */ - if (ctx->sigio == 0) block_in(b); - - /* 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); - - 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) - { - block_out(b); - } - }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) - block_out(b); - - 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; - EVP_DigestInit_ex(&ctx->md, md, NULL); - 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 void 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; - - EVP_DigestInit_ex(md, md->digest, NULL); - /* 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; - - EVP_DigestUpdate(md, WELLKNOWN, strlen(WELLKNOWN)); - EVP_DigestFinal_ex(md, &(ctx->buf[ctx->buf_len]), NULL); - ctx->buf_len+= md->digest->md_size; - ctx->blockout= 1; - ctx->sigio= 0; - } - -static void 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; - - EVP_DigestInit_ex(md, md->digest, NULL); - 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; - - EVP_DigestUpdate(md, WELLKNOWN, strlen(WELLKNOWN)); - EVP_DigestFinal_ex(md, tmp, NULL); - 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; - } - } - -static void 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); - EVP_DigestUpdate(md, (unsigned char*) &(ctx->buf[OK_BLOCK_BLOCK]), tl); - EVP_DigestFinal_ex(md, &(ctx->buf[ctx->buf_len]), NULL); - ctx->buf_len+= md->digest->md_size; - ctx->blockout= 1; - } - -static void 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; - - EVP_DigestUpdate(md, (unsigned char*) &(ctx->buf[OK_BLOCK_BLOCK]), tl); - EVP_DigestFinal_ex(md, tmp, NULL); - 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; - } - } - |