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+/* crypto/asn1/a_int.c */
+/* Copyright (C) 1995-1997 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 "cryptlib.h"
+#include "asn1.h"
+
+/* ASN1err(ASN1_F_D2I_ASN1_INTEGER,ASN1_R_EXPECTING_AN_INTEGER);
+ */
+
+int i2d_ASN1_INTEGER(a,pp)
+ASN1_INTEGER *a;
+unsigned char **pp;
+ {
+ int pad=0,ret,r,i,t;
+ unsigned char *p,*pt,*n,pb=0;
+
+ if ((a == NULL) || (a->data == NULL)) return(0);
+ t=a->type;
+ if (a->length == 0)
+ ret=1;
+ else
+ {
+ ret=a->length;
+ i=a->data[0];
+ if ((t == V_ASN1_INTEGER) && (i > 127))
+ {
+ pad=1;
+ pb=0;
+ }
+ else if ((t == V_ASN1_NEG_INTEGER) && (i>128))
+ {
+ pad=1;
+ pb=0xFF;
+ }
+ ret+=pad;
+ }
+ r=ASN1_object_size(0,ret,V_ASN1_INTEGER);
+ if (pp == NULL) return(r);
+ p= *pp;
+
+ ASN1_put_object(&p,0,ret,V_ASN1_INTEGER,V_ASN1_UNIVERSAL);
+ if (pad) *(p++)=pb;
+ if (a->length == 0)
+ *(p++)=0;
+ else if (t == V_ASN1_INTEGER)
+ {
+ memcpy(p,a->data,(unsigned int)a->length);
+ p+=a->length;
+ }
+ else
+ {
+ n=a->data;
+ pt=p;
+ for (i=a->length; i>0; i--)
+ *(p++)= (*(n++)^0xFF)+1;
+ if (!pad) *pt|=0x80;
+ }
+
+ *pp=p;
+ return(r);
+ }
+
+ASN1_INTEGER *d2i_ASN1_INTEGER(a, pp, length)
+ASN1_INTEGER **a;
+unsigned char **pp;
+long length;
+ {
+ ASN1_INTEGER *ret=NULL;
+ unsigned char *p,*to,*s;
+ long len;
+ int inf,tag,xclass;
+ int i;
+
+ if ((a == NULL) || ((*a) == NULL))
+ {
+ if ((ret=ASN1_INTEGER_new()) == NULL) return(NULL);
+ ret->type=V_ASN1_INTEGER;
+ }
+ else
+ ret=(*a);
+
+ p= *pp;
+ inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
+ if (inf & 0x80)
+ {
+ i=ASN1_R_BAD_OBJECT_HEADER;
+ goto err;
+ }
+
+ if (tag != V_ASN1_INTEGER)
+ {
+ i=ASN1_R_EXPECTING_AN_INTEGER;
+ goto err;
+ }
+
+ /* We must Malloc stuff, even for 0 bytes otherwise it
+ * signifies a missing NULL parameter. */
+ s=(unsigned char *)Malloc((int)len+1);
+ if (s == NULL)
+ {
+ i=ERR_R_MALLOC_FAILURE;
+ goto err;
+ }
+ to=s;
+ if (*p & 0x80) /* a negative number */
+ {
+ ret->type=V_ASN1_NEG_INTEGER;
+ if (*p == 0xff)
+ {
+ p++;
+ len--;
+ }
+ for (i=(int)len; i>0; i--)
+ *(to++)= (*(p++)^0xFF)+1;
+ }
+ else
+ {
+ ret->type=V_ASN1_INTEGER;
+ if ((*p == 0) && (len != 1))
+ {
+ p++;
+ len--;
+ }
+ memcpy(s,p,(int)len);
+ p+=len;
+ }
+
+ if (ret->data != NULL) Free((char *)ret->data);
+ ret->data=s;
+ ret->length=(int)len;
+ if (a != NULL) (*a)=ret;
+ *pp=p;
+ return(ret);
+err:
+ ASN1err(ASN1_F_D2I_ASN1_INTEGER,i);
+ if ((ret != NULL) && ((a == NULL) || (*a != ret)))
+ ASN1_INTEGER_free(ret);
+ return(NULL);
+ }
+
+int ASN1_INTEGER_set(a,v)
+ASN1_INTEGER *a;
+long v;
+ {
+ int i,j,k;
+ unsigned char buf[sizeof(long)+1];
+ long d;
+
+ a->type=V_ASN1_INTEGER;
+ if (a->length < (sizeof(long)+1))
+ {
+ if (a->data != NULL)
+ Free((char *)a->data);
+ if ((a->data=(unsigned char *)Malloc(sizeof(long)+1)) != NULL)
+ memset((char *)a->data,0,sizeof(long)+1);
+ }
+ if (a->data == NULL)
+ {
+ ASN1err(ASN1_F_ASN1_INTEGER_SET,ERR_R_MALLOC_FAILURE);
+ return(0);
+ }
+ d=v;
+ if (d < 0)
+ {
+ d= -d;
+ a->type=V_ASN1_NEG_INTEGER;
+ }
+
+ for (i=0; i<sizeof(long); i++)
+ {
+ if (d == 0) break;
+ buf[i]=(int)d&0xff;
+ d>>=8;
+ }
+ j=0;
+ if (v < 0) a->data[j++]=0;
+ for (k=i-1; k >=0; k--)
+ a->data[j++]=buf[k];
+ a->length=j;
+ return(1);
+ }
+
+long ASN1_INTEGER_get(a)
+ASN1_INTEGER *a;
+ {
+ int neg=0,i;
+ long r=0;
+
+ if (a == NULL) return(0L);
+ i=a->type;
+ if (i == V_ASN1_NEG_INTEGER)
+ neg=1;
+ else if (i != V_ASN1_INTEGER)
+ return(0);
+
+ if (a->length > sizeof(long))
+ {
+ return(0xFFFFFFFFL);
+ }
+ if (a->data == NULL)
+ return(0);
+
+ for (i=0; i<a->length; i++)
+ {
+ r<<=8;
+ r|=(unsigned char)a->data[i];
+ }
+ if (neg) r= -r;
+ return(r);
+ }
+
+ASN1_INTEGER *BN_to_ASN1_INTEGER(bn,ai)
+BIGNUM *bn;
+ASN1_INTEGER *ai;
+ {
+ ASN1_INTEGER *ret;
+ int len,j;
+
+ if (ai == NULL)
+ ret=ASN1_INTEGER_new();
+ else
+ ret=ai;
+ if (ret == NULL)
+ {
+ ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ASN1_R_ERROR_STACK);
+ goto err;
+ }
+ ret->type=V_ASN1_INTEGER;
+ j=BN_num_bits(bn);
+ len=((j == 0)?0:((j/8)+1));
+ ret->data=(unsigned char *)Malloc(len+4);
+ ret->length=BN_bn2bin(bn,ret->data);
+ return(ret);
+err:
+ if (ret != ai) ASN1_INTEGER_free(ret);
+ return(NULL);
+ }
+
+BIGNUM *ASN1_INTEGER_to_BN(ai,bn)
+ASN1_INTEGER *ai;
+BIGNUM *bn;
+ {
+ BIGNUM *ret;
+
+ if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
+ ASN1err(ASN1_F_ASN1_INTEGER_TO_BN,ASN1_R_BN_LIB);
+ return(ret);
+ }
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