diff options
Diffstat (limited to 'crypto/pkcs7/bio_ber.c')
| -rw-r--r-- | crypto/pkcs7/bio_ber.c | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/crypto/pkcs7/bio_ber.c b/crypto/pkcs7/bio_ber.c new file mode 100644 index 0000000000..df4d9a5223 --- /dev/null +++ b/crypto/pkcs7/bio_ber.c @@ -0,0 +1,479 @@ +/* crypto/evp/bio_ber.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.] + */ + +#include <stdio.h> +#include <errno.h> +#include "cryptlib.h" +#include "buffer.h" +#include "evp.h" + +#ifndef NOPROTO +static int ber_write(BIO *h,char *buf,int num); +static int ber_read(BIO *h,char *buf,int size); +/*static int ber_puts(BIO *h,char *str); */ +/*static int ber_gets(BIO *h,char *str,int size); */ +static long ber_ctrl(BIO *h,int cmd,long arg1,char *arg2); +static int ber_new(BIO *h); +static int ber_free(BIO *data); +#else +static int ber_write(); +static int ber_read(); +/*static int ber_puts(); */ +/*static int ber_gets(); */ +static long ber_ctrl(); +static int ber_new(); +static int ber_free(); +#endif + +#define BER_BUF_SIZE (32) + +/* This is used to hold the state of the BER objects being read. */ +typedef struct ber_struct + { + int tag; + int class; + long length; + int inf; + int num_left; + int depth; + } BER_CTX; + +typedef struct bio_ber_struct + { + int tag; + int class; + long length; + int inf; + + /* most of the following are used when doing non-blocking IO */ + /* reading */ + long num_left; /* number of bytes still to read/write in block */ + int depth; /* used with idefinite encoding. */ + int finished; /* No more read data */ + + /* writting */ + char *w_addr; + int w_offset; + int w_left; + + int buf_len; + int buf_off; + unsigned char buf[BER_BUF_SIZE]; + } BIO_BER_CTX; + +static BIO_METHOD methods_ber= + { + BIO_TYPE_CIPHER,"cipher", + ber_write, + ber_read, + NULL, /* ber_puts, */ + NULL, /* ber_gets, */ + ber_ctrl, + ber_new, + ber_free, + }; + +BIO_METHOD *BIO_f_ber() + { + return(&methods_ber); + } + +static int ber_new(bi) +BIO *bi; + { + BIO_BER_CTX *ctx; + + ctx=(BIO_BER_CTX *)Malloc(sizeof(BIO_BER_CTX)); + if (ctx == NULL) return(0); + + memset((char *)ctx,0,sizeof(BIO_BER_CTX)); + + bi->init=0; + bi->ptr=(char *)ctx; + bi->flags=0; + return(1); + } + +static int ber_free(a) +BIO *a; + { + BIO_BER_CTX *b; + + if (a == NULL) return(0); + b=(BIO_BER_CTX *)a->ptr; + memset(a->ptr,0,sizeof(BIO_BER_CTX)); + Free(a->ptr); + a->ptr=NULL; + a->init=0; + a->flags=0; + return(1); + } + +int bio_ber_get_header(bio,ctx) +BIO *bio; +BIO_BER_CTX *ctx; + { + char buf[64]; + int i,j,n; + int ret; + unsigned char *p; + unsigned long length + int tag; + int class; + long max; + + BIO_clear_retry_flags(b); + + /* Pack the buffer down if there is a hole at the front */ + if (ctx->buf_off != 0) + { + p=ctx->buf; + j=ctx->buf_off; + n=ctx->buf_len-j; + for (i=0; i<n; i++) + { + p[0]=p[j]; + p++; + } + ctx->buf_len-j; + ctx->buf_off=0; + } + + /* If there is more room, read some more data */ + i=BER_BUF_SIZE-ctx->buf_len; + if (i) + { + i=BIO_read(bio->next_bio,&(ctx->buf[ctx->buf_len]),i); + if (i <= 0) + { + BIO_copy_next_retry(b); + return(i); + } + else + ctx->buf_len+=i; + } + + max=ctx->buf_len; + p=ctx->buf; + ret=ASN1_get_object(&p,&length,&tag,&class,max); + + if (ret & 0x80) + { + if ((ctx->buf_len < BER_BUF_SIZE) && + (ERR_GET_REASON(ERR_peek_error()) == ASN1_R_TOO_LONG)) + { + ERR_get_error(); /* clear the error */ + BIO_set_retry_read(b); + } + return(-1); + } + + /* We have no error, we have a header, so make use of it */ + + if ((ctx->tag >= 0) && (ctx->tag != tag)) + { + BIOerr(BIO_F_BIO_BER_GET_HEADER,BIO_R_TAG_MISMATCH); + sprintf(buf,"tag=%d, got %d",ctx->tag,tag); + ERR_add_error_data(1,buf); + return(-1); + } + if (ret & 0x01) + if (ret & V_ASN1_CONSTRUCTED) + } + +static int ber_read(b,out,outl) +BIO *b; +char *out; +int outl; + { + int ret=0,i,n; + BIO_BER_CTX *ctx; + + BIO_clear_retry_flags(b); + + if (out == NULL) return(0); + ctx=(BIO_BER_CTX *)b->ptr; + + if ((ctx == NULL) || (b->next_bio == NULL)) return(0); + + if (ctx->finished) return(0); + +again: + /* First see if we are half way through reading a block */ + if (ctx->num_left > 0) + { + if (ctx->num_left < outl) + n=ctx->num_left; + else + n=outl; + i=BIO_read(b->next_bio,out,n); + if (i <= 0) + { + BIO_copy_next_retry(b); + return(i); + } + ctx->num_left-=i; + outl-=i; + ret+=i; + if (ctx->num_left <= 0) + { + ctx->depth--; + if (ctx->depth <= 0) + ctx->finished=1; + } + if (outl <= 0) + return(ret); + else + goto again; + } + else /* we need to read another BER header */ + { + } + } + +static int ber_write(b,in,inl) +BIO *b; +char *in; +int inl; + { + int ret=0,n,i; + BIO_ENC_CTX *ctx; + + ctx=(BIO_ENC_CTX *)b->ptr; + ret=inl; + + BIO_clear_retry_flags(b); + n=ctx->buf_len-ctx->buf_off; + while (n > 0) + { + i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); + if (i <= 0) + { + BIO_copy_next_retry(b); + return(i); + } + ctx->buf_off+=i; + n-=i; + } + /* at this point all pending data has been written */ + + if ((in == NULL) || (inl <= 0)) return(0); + + ctx->buf_off=0; + while (inl > 0) + { + n=(inl > ENC_BLOCK_SIZE)?ENC_BLOCK_SIZE:inl; + EVP_CipherUpdate(&(ctx->cipher), + (unsigned char *)ctx->buf,&ctx->buf_len, + (unsigned char *)in,n); + inl-=n; + in+=n; + + ctx->buf_off=0; + n=ctx->buf_len; + while (n > 0) + { + i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n); + if (i <= 0) + { + BIO_copy_next_retry(b); + return(i); + } + n-=i; + ctx->buf_off+=i; + } + ctx->buf_len=0; + ctx->buf_off=0; + } + BIO_copy_next_retry(b); + return(ret); + } + +static long ber_ctrl(b,cmd,num,ptr) +BIO *b; +int cmd; +long num; +char *ptr; + { + BIO *dbio; + BIO_ENC_CTX *ctx,*dctx; + long ret=1; + int i; + + ctx=(BIO_ENC_CTX *)b->ptr; + + switch (cmd) + { + case BIO_CTRL_RESET: + ctx->ok=1; + ctx->finished=0; + EVP_CipherInit(&(ctx->cipher),NULL,NULL,NULL, + ctx->cipher.berrypt); + 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_WPENDING: + ret=ctx->buf_len-ctx->buf_off; + if (ret <= 0) + ret=BIO_ctrl(b->next_bio,cmd,num,ptr); + break; + case BIO_CTRL_PENDING: /* More to read in buffer */ + ret=ctx->buf_len-ctx->buf_off; + if (ret <= 0) + ret=BIO_ctrl(b->next_bio,cmd,num,ptr); + break; + case BIO_CTRL_FLUSH: + /* do a final write */ +again: + while (ctx->buf_len != ctx->buf_off) + { + i=ber_write(b,NULL,0); + if (i < 0) + { + ret=i; + break; + } + } + + if (!ctx->finished) + { + ctx->finished=1; + ctx->buf_off=0; + ret=EVP_CipherFinal(&(ctx->cipher), + (unsigned char *)ctx->buf, + &(ctx->buf_len)); + ctx->ok=(int)ret; + if (ret <= 0) break; + + /* push out the bytes */ + goto again; + } + + /* Finally flush the underlying BIO */ + ret=BIO_ctrl(b->next_bio,cmd,num,ptr); + break; + case BIO_C_GET_CIPHER_STATUS: + ret=(long)ctx->ok; + 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_DUP: + dbio=(BIO *)ptr; + dctx=(BIO_ENC_CTX *)dbio->ptr; + memcpy(&(dctx->cipher),&(ctx->cipher),sizeof(ctx->cipher)); + dbio->init=1; + break; + default: + ret=BIO_ctrl(b->next_bio,cmd,num,ptr); + break; + } + 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); + } +*/ + +void BIO_set_cipher(b,c,k,i,e) +BIO *b; +EVP_CIPHER *c; +unsigned char *k; +unsigned char *i; +int e; + { + BIO_ENC_CTX *ctx; + + 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; + EVP_CipherInit(&(ctx->cipher),c,k,i,e); + + if (b->callback != NULL) + b->callback(b,BIO_CB_CTRL,(char *)c,BIO_CTRL_SET,e,1L); + } + |