2754597013
I have tried to convert 'len' type variable declarations to unsigned as a means to address these warnings when appropriate, but when in doubt I have used casts in the comparisons instead. The better solution (that would get us all lynched by API users) would be to go through and convert all the function prototypes and structure definitions to use unsigned variables except when signed is necessary. The proliferation of (signed) "int" for strictly non-negative uses is unfortunate.
437 lines
11 KiB
C
437 lines
11 KiB
C
/* crypto/asn1/a_int.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 "cryptlib.h"
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#include <openssl/asn1.h>
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ASN1_INTEGER *ASN1_INTEGER_dup(ASN1_INTEGER *x)
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{ return M_ASN1_INTEGER_dup(x);}
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int ASN1_INTEGER_cmp(ASN1_INTEGER *x, ASN1_INTEGER *y)
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{ return M_ASN1_INTEGER_cmp(x,y);}
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/*
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* This converts an ASN1 INTEGER into its content encoding.
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* The internal representation is an ASN1_STRING whose data is a big endian
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* representation of the value, ignoring the sign. The sign is determined by
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* the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative.
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*
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* Positive integers are no problem: they are almost the same as the DER
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* encoding, except if the first byte is >= 0x80 we need to add a zero pad.
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*
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* Negative integers are a bit trickier...
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* The DER representation of negative integers is in 2s complement form.
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* The internal form is converted by complementing each octet and finally
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* adding one to the result. This can be done less messily with a little trick.
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* If the internal form has trailing zeroes then they will become FF by the
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* complement and 0 by the add one (due to carry) so just copy as many trailing
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* zeros to the destination as there are in the source. The carry will add one
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* to the last none zero octet: so complement this octet and add one and finally
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* complement any left over until you get to the start of the string.
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*
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* Padding is a little trickier too. If the first bytes is > 0x80 then we pad
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* with 0xff. However if the first byte is 0x80 and one of the following bytes
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* is non-zero we pad with 0xff. The reason for this distinction is that 0x80
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* followed by optional zeros isn't padded.
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*/
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int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
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{
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int pad=0,ret,i,neg;
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unsigned char *p,*n,pb=0;
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if ((a == NULL) || (a->data == NULL)) return(0);
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neg=a->type & V_ASN1_NEG;
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if (a->length == 0)
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ret=1;
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else
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{
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ret=a->length;
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i=a->data[0];
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if (!neg && (i > 127)) {
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pad=1;
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pb=0;
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} else if(neg) {
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if(i>128) {
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pad=1;
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pb=0xFF;
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} else if(i == 128) {
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/*
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* Special case: if any other bytes non zero we pad:
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* otherwise we don't.
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*/
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for(i = 1; i < a->length; i++) if(a->data[i]) {
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pad=1;
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pb=0xFF;
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break;
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}
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}
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}
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ret+=pad;
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}
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if (pp == NULL) return(ret);
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p= *pp;
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if (pad) *(p++)=pb;
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if (a->length == 0) *(p++)=0;
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else if (!neg) memcpy(p,a->data,(unsigned int)a->length);
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else {
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/* Begin at the end of the encoding */
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n=a->data + a->length - 1;
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p += a->length - 1;
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i = a->length;
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/* Copy zeros to destination as long as source is zero */
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while(!*n) {
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*(p--) = 0;
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n--;
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i--;
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}
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/* Complement and increment next octet */
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*(p--) = ((*(n--)) ^ 0xff) + 1;
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i--;
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/* Complement any octets left */
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for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
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}
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*pp+=ret;
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return(ret);
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}
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/* Convert just ASN1 INTEGER content octets to ASN1_INTEGER structure */
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ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, unsigned char **pp,
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long len)
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{
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ASN1_INTEGER *ret=NULL;
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unsigned char *p,*to,*s, *pend;
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int i;
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if ((a == NULL) || ((*a) == NULL))
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{
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if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
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ret->type=V_ASN1_INTEGER;
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}
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else
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ret=(*a);
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p= *pp;
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pend = p + len;
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/* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
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* signifies a missing NULL parameter. */
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s=(unsigned char *)OPENSSL_malloc((int)len+1);
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if (s == NULL)
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{
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i=ERR_R_MALLOC_FAILURE;
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goto err;
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}
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to=s;
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if(!len) {
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/* Strictly speaking this is an illegal INTEGER but we
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* tolerate it.
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*/
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ret->type=V_ASN1_INTEGER;
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} else if (*p & 0x80) /* a negative number */
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{
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ret->type=V_ASN1_NEG_INTEGER;
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if ((*p == 0xff) && (len != 1)) {
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p++;
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len--;
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}
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i = len;
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p += i - 1;
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to += i - 1;
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while((!*p) && i) {
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*(to--) = 0;
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i--;
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p--;
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}
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/* Special case: if all zeros then the number will be of
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* the form FF followed by n zero bytes: this corresponds to
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* 1 followed by n zero bytes. We've already written n zeros
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* so we just append an extra one and set the first byte to
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* a 1. This is treated separately because it is the only case
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* where the number of bytes is larger than len.
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*/
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if(!i) {
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*s = 1;
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s[len] = 0;
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len++;
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} else {
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*(to--) = (*(p--) ^ 0xff) + 1;
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i--;
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for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
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}
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} else {
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ret->type=V_ASN1_INTEGER;
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if ((*p == 0) && (len != 1))
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{
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p++;
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len--;
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}
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memcpy(s,p,(int)len);
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}
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if (ret->data != NULL) OPENSSL_free(ret->data);
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ret->data=s;
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ret->length=(int)len;
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if (a != NULL) (*a)=ret;
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*pp=pend;
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return(ret);
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err:
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ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
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if ((ret != NULL) && ((a == NULL) || (*a != ret)))
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M_ASN1_INTEGER_free(ret);
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return(NULL);
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}
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/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
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* ASN1 integers: some broken software can encode a positive INTEGER
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* with its MSB set as negative (it doesn't add a padding zero).
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*/
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ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, unsigned char **pp,
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long length)
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{
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ASN1_INTEGER *ret=NULL;
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unsigned char *p,*to,*s;
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long len;
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int inf,tag,xclass;
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int i;
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if ((a == NULL) || ((*a) == NULL))
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{
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if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
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ret->type=V_ASN1_INTEGER;
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}
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else
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ret=(*a);
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p= *pp;
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inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
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if (inf & 0x80)
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{
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i=ASN1_R_BAD_OBJECT_HEADER;
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goto err;
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}
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if (tag != V_ASN1_INTEGER)
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{
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i=ASN1_R_EXPECTING_AN_INTEGER;
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goto err;
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}
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/* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
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* signifies a missing NULL parameter. */
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s=(unsigned char *)OPENSSL_malloc((int)len+1);
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if (s == NULL)
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{
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i=ERR_R_MALLOC_FAILURE;
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goto err;
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}
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to=s;
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ret->type=V_ASN1_INTEGER;
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if(len) {
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if ((*p == 0) && (len != 1))
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{
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p++;
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len--;
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}
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memcpy(s,p,(int)len);
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p+=len;
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}
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if (ret->data != NULL) OPENSSL_free(ret->data);
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ret->data=s;
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ret->length=(int)len;
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if (a != NULL) (*a)=ret;
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*pp=p;
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return(ret);
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err:
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ASN1err(ASN1_F_D2I_ASN1_UINTEGER,i);
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if ((ret != NULL) && ((a == NULL) || (*a != ret)))
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M_ASN1_INTEGER_free(ret);
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return(NULL);
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}
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int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
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{
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int j,k;
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unsigned int i;
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unsigned char buf[sizeof(long)+1];
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long d;
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a->type=V_ASN1_INTEGER;
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if (a->length < (int)(sizeof(long)+1))
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{
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if (a->data != NULL)
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OPENSSL_free(a->data);
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if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)
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memset((char *)a->data,0,sizeof(long)+1);
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}
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if (a->data == NULL)
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{
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ASN1err(ASN1_F_ASN1_INTEGER_SET,ERR_R_MALLOC_FAILURE);
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return(0);
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}
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d=v;
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if (d < 0)
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{
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d= -d;
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a->type=V_ASN1_NEG_INTEGER;
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}
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for (i=0; i<sizeof(long); i++)
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{
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if (d == 0) break;
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buf[i]=(int)d&0xff;
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d>>=8;
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}
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j=0;
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for (k=i-1; k >=0; k--)
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a->data[j++]=buf[k];
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a->length=j;
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return(1);
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}
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long ASN1_INTEGER_get(ASN1_INTEGER *a)
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{
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int neg=0,i;
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long r=0;
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if (a == NULL) return(0L);
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i=a->type;
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if (i == V_ASN1_NEG_INTEGER)
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neg=1;
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else if (i != V_ASN1_INTEGER)
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return -1;
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if (a->length > (int)sizeof(long))
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{
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/* hmm... a bit ugly */
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return(0xffffffffL);
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}
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if (a->data == NULL)
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return 0;
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for (i=0; i<a->length; i++)
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{
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r<<=8;
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r|=(unsigned char)a->data[i];
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}
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if (neg) r= -r;
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return(r);
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}
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ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *bn, ASN1_INTEGER *ai)
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{
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ASN1_INTEGER *ret;
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int len,j;
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if (ai == NULL)
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ret=M_ASN1_INTEGER_new();
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else
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ret=ai;
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if (ret == NULL)
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{
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ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR);
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goto err;
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}
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if (BN_get_sign(bn))
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ret->type = V_ASN1_NEG_INTEGER;
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else ret->type=V_ASN1_INTEGER;
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j=BN_num_bits(bn);
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len=((j == 0)?0:((j/8)+1));
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if (ret->length < len+4)
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{
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unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
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if (!new_data)
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{
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ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
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goto err;
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}
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ret->data=new_data;
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}
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ret->length=BN_bn2bin(bn,ret->data);
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/* Correct zero case */
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if(!ret->length)
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{
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ret->data[0] = 0;
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ret->length = 1;
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}
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return(ret);
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err:
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if (ret != ai) M_ASN1_INTEGER_free(ret);
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return(NULL);
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}
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BIGNUM *ASN1_INTEGER_to_BN(ASN1_INTEGER *ai, BIGNUM *bn)
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{
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BIGNUM *ret;
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if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
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ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB);
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else if(ai->type == V_ASN1_NEG_INTEGER)
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BN_set_sign(ret, 1);
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return(ret);
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}
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IMPLEMENT_STACK_OF(ASN1_INTEGER)
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IMPLEMENT_ASN1_SET_OF(ASN1_INTEGER)
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