--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ssl/libcrypto/src/crypto/asn1/a_int.c	Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,459 @@
+/* crypto/asn1/a_int.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 "cryptlib.h"
+#include <openssl/asn1.h>
+#include <openssl/bn.h>
+
+EXPORT_C ASN1_INTEGER *ASN1_INTEGER_dup(ASN1_INTEGER *x)
+{ return M_ASN1_INTEGER_dup(x);}
+
+EXPORT_C int ASN1_INTEGER_cmp(ASN1_INTEGER *x, ASN1_INTEGER *y)
+	{ 
+	int neg, ret;
+	/* Compare signs */
+	neg = x->type & V_ASN1_NEG;
+	if (neg != (y->type & V_ASN1_NEG))
+		{
+		if (neg)
+			return -1;
+		else
+			return 1;
+		}
+
+	ret = ASN1_STRING_cmp(x, y);
+
+	if (neg)
+		return -ret;
+	else
+		return ret;
+	}
+	
+
+/* 
+ * This converts an ASN1 INTEGER into its content encoding.
+ * The internal representation is an ASN1_STRING whose data is a big endian
+ * representation of the value, ignoring the sign. The sign is determined by
+ * the type: V_ASN1_INTEGER for positive and V_ASN1_NEG_INTEGER for negative. 
+ *
+ * Positive integers are no problem: they are almost the same as the DER
+ * encoding, except if the first byte is >= 0x80 we need to add a zero pad.
+ *
+ * Negative integers are a bit trickier...
+ * The DER representation of negative integers is in 2s complement form.
+ * The internal form is converted by complementing each octet and finally 
+ * adding one to the result. This can be done less messily with a little trick.
+ * If the internal form has trailing zeroes then they will become FF by the
+ * complement and 0 by the add one (due to carry) so just copy as many trailing 
+ * zeros to the destination as there are in the source. The carry will add one
+ * to the last none zero octet: so complement this octet and add one and finally
+ * complement any left over until you get to the start of the string.
+ *
+ * Padding is a little trickier too. If the first bytes is > 0x80 then we pad
+ * with 0xff. However if the first byte is 0x80 and one of the following bytes
+ * is non-zero we pad with 0xff. The reason for this distinction is that 0x80
+ * followed by optional zeros isn't padded.
+ */
+
+EXPORT_C int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
+	{
+	int pad=0,ret,i,neg;
+	unsigned char *p,*n,pb=0;
+
+	if ((a == NULL) || (a->data == NULL)) return(0);
+	neg=a->type & V_ASN1_NEG;
+	if (a->length == 0)
+		ret=1;
+	else
+		{
+		ret=a->length;
+		i=a->data[0];
+		if (!neg && (i > 127)) {
+			pad=1;
+			pb=0;
+		} else if(neg) {
+			if(i>128) {
+				pad=1;
+				pb=0xFF;
+			} else if(i == 128) {
+			/*
+			 * Special case: if any other bytes non zero we pad:
+			 * otherwise we don't.
+			 */
+				for(i = 1; i < a->length; i++) if(a->data[i]) {
+						pad=1;
+						pb=0xFF;
+						break;
+				}
+			}
+		}
+		ret+=pad;
+		}
+	if (pp == NULL) return(ret);
+	p= *pp;
+
+	if (pad) *(p++)=pb;
+	if (a->length == 0) *(p++)=0;
+	else if (!neg) memcpy(p,a->data,(unsigned int)a->length);
+	else {
+		/* Begin at the end of the encoding */
+		n=a->data + a->length - 1;
+		p += a->length - 1;
+		i = a->length;
+		/* Copy zeros to destination as long as source is zero */
+		while(!*n) {
+			*(p--) = 0;
+			n--;
+			i--;
+		}
+		/* Complement and increment next octet */
+		*(p--) = ((*(n--)) ^ 0xff) + 1;
+		i--;
+		/* Complement any octets left */
+		for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
+	}
+
+	*pp+=ret;
+	return(ret);
+	}
+
+/* Convert just ASN1 INTEGER content octets to ASN1_INTEGER structure */
+
+EXPORT_C ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **pp,
+	     long len)
+	{
+	ASN1_INTEGER *ret=NULL;
+	const unsigned char *p, *pend;
+	unsigned char *to,*s;
+	int i;
+
+	if ((a == NULL) || ((*a) == NULL))
+		{
+		if ((ret=M_ASN1_INTEGER_new()) == NULL) return(NULL);
+		ret->type=V_ASN1_INTEGER;
+		}
+	else
+		ret=(*a);
+
+	p= *pp;
+	pend = p + len;
+
+	/* We must OPENSSL_malloc stuff, even for 0 bytes otherwise it
+	 * signifies a missing NULL parameter. */
+	s=(unsigned char *)OPENSSL_malloc((int)len+1);
+	if (s == NULL)
+		{
+		i=ERR_R_MALLOC_FAILURE;
+		goto err;
+		}
+	to=s;
+	if(!len) {
+		/* Strictly speaking this is an illegal INTEGER but we
+		 * tolerate it.
+		 */
+		ret->type=V_ASN1_INTEGER;
+	} else if (*p & 0x80) /* a negative number */
+		{
+		ret->type=V_ASN1_NEG_INTEGER;
+		if ((*p == 0xff) && (len != 1)) {
+			p++;
+			len--;
+		}
+		i = len;
+		p += i - 1;
+		to += i - 1;
+		while((!*p) && i) {
+			*(to--) = 0;
+			i--;
+			p--;
+		}
+		/* Special case: if all zeros then the number will be of
+		 * the form FF followed by n zero bytes: this corresponds to
+		 * 1 followed by n zero bytes. We've already written n zeros
+		 * so we just append an extra one and set the first byte to
+		 * a 1. This is treated separately because it is the only case
+		 * where the number of bytes is larger than len.
+		 */
+		if(!i) {
+			*s = 1;
+			s[len] = 0;
+			len++;
+		} else {
+			*(to--) = (*(p--) ^ 0xff) + 1;
+			i--;
+			for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
+		}
+	} else {
+		ret->type=V_ASN1_INTEGER;
+		if ((*p == 0) && (len != 1))
+			{
+			p++;
+			len--;
+			}
+		memcpy(s,p,(int)len);
+	}
+
+	if (ret->data != NULL) OPENSSL_free(ret->data);
+	ret->data=s;
+	ret->length=(int)len;
+	if (a != NULL) (*a)=ret;
+	*pp=pend;
+	return(ret);
+err:
+	ASN1err(ASN1_F_C2I_ASN1_INTEGER,i);
+	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
+		M_ASN1_INTEGER_free(ret);
+	return(NULL);
+	}
+
+
+/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
+ * ASN1 integers: some broken software can encode a positive INTEGER
+ * with its MSB set as negative (it doesn't add a padding zero).
+ */
+
+EXPORT_C ASN1_INTEGER *d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp,
+	     long length)
+	{
+	ASN1_INTEGER *ret=NULL;
+	const unsigned char *p;
+	unsigned char *to,*s;
+	long len;
+	int inf,tag,xclass;
+	int i;
+
+	if ((a == NULL) || ((*a) == NULL))
+		{
+		if ((ret=M_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 OPENSSL_malloc stuff, even for 0 bytes otherwise it
+	 * signifies a missing NULL parameter. */
+	s=(unsigned char *)OPENSSL_malloc((int)len+1);
+	if (s == NULL)
+		{
+		i=ERR_R_MALLOC_FAILURE;
+		goto err;
+		}
+	to=s;
+	ret->type=V_ASN1_INTEGER;
+	if(len) {
+		if ((*p == 0) && (len != 1))
+			{
+			p++;
+			len--;
+			}
+		memcpy(s,p,(int)len);
+		p+=len;
+	}
+
+	if (ret->data != NULL) OPENSSL_free(ret->data);
+	ret->data=s;
+	ret->length=(int)len;
+	if (a != NULL) (*a)=ret;
+	*pp=p;
+	return(ret);
+err:
+	ASN1err(ASN1_F_D2I_ASN1_UINTEGER,i);
+	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
+		M_ASN1_INTEGER_free(ret);
+	return(NULL);
+	}
+
+EXPORT_C int ASN1_INTEGER_set(ASN1_INTEGER *a, long v)
+	{
+	int j,k;
+	unsigned int i;
+	unsigned char buf[sizeof(long)+1];
+	long d;
+
+	a->type=V_ASN1_INTEGER;
+	if (a->length < (int)(sizeof(long)+1))
+		{
+		if (a->data != NULL)
+			OPENSSL_free(a->data);
+		if ((a->data=(unsigned char *)OPENSSL_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;
+	for (k=i-1; k >=0; k--)
+		a->data[j++]=buf[k];
+	a->length=j;
+	return(1);
+	}
+
+EXPORT_C long ASN1_INTEGER_get(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 -1;
+	
+	if (a->length > (int)sizeof(long))
+		{
+		/* hmm... a bit ugly */
+		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);
+	}
+
+EXPORT_C ASN1_INTEGER *BN_to_ASN1_INTEGER(BIGNUM *bn, ASN1_INTEGER *ai)
+	{
+	ASN1_INTEGER *ret;
+	int len,j;
+
+	if (ai == NULL)
+		ret=M_ASN1_INTEGER_new();
+	else
+		ret=ai;
+	if (ret == NULL)
+		{
+		ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_NESTED_ASN1_ERROR);
+		goto err;
+		}
+	if (BN_is_negative(bn))
+		ret->type = V_ASN1_NEG_INTEGER;
+	else ret->type=V_ASN1_INTEGER;
+	j=BN_num_bits(bn);
+	len=((j == 0)?0:((j/8)+1));
+	if (ret->length < len+4)
+		{
+		unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
+		if (!new_data)
+			{
+			ASN1err(ASN1_F_BN_TO_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
+			goto err;
+			}
+		ret->data=new_data;
+		}
+	ret->length=BN_bn2bin(bn,ret->data);
+	/* Correct zero case */
+	if(!ret->length)
+		{
+		ret->data[0] = 0;
+		ret->length = 1;
+		}
+	return(ret);
+err:
+	if (ret != ai) M_ASN1_INTEGER_free(ret);
+	return(NULL);
+	}
+
+EXPORT_C BIGNUM *ASN1_INTEGER_to_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);
+	else if(ai->type == V_ASN1_NEG_INTEGER)
+		BN_set_negative(ret, 1);
+	return(ret);
+	}
+
+IMPLEMENT_STACK_OF(ASN1_INTEGER)
+IMPLEMENT_ASN1_SET_OF(ASN1_INTEGER)