Memory Leaks

[psatpathy]

Hi,
     I am facing a memory leaks in my program. I am using
BN_new,BN_CTX_new,BN_mod_exp,BN_free and BN_CTX_free  OpenSSL functions in my
program only.  I am using "openssl-0.9.6b" libraries in Solaris 8. I am
attaching my code for your reference. Please let me know how can I come over
from memory leak.


With Regards,
-Pratap

Compilation output :

        (cd ..; make -f Makefile.ssl DIRS=test all)
+ rm -f libcrypto.so.0
+ rm -f libcrypto.so
+ rm -f libcrypto.so.0.9.6
+ rm -f libssl.so.0
+ rm -f libssl.so
+ rm -f libssl.so.0.9.6
making all in test...
cc -I../include -KPIC -DTHREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H
-xtarget=ultra -xarch=v8plus -xO5 -xstrconst -xdepend -Xa -DB_ENDIAN -DBN_DIV2W
-DULTRASPARC -DMD5_ASM  -c  bn_mod_exp.c
cc -o bn_mod_exp -I../include -KPIC -DTHREADS -D_REENTRANT -DDSO_DLFCN
-DHAVE_DLFCN_H -xtarget=ultra -xarch=v8plus -xO5 -xstrconst -xdepend -Xa
-DB_ENDIAN -DBN_DIV2W -DULTRASPARC -DMD5_ASM bn_mod_exp.o  -L.. -lcrypto
-lsocket -lnsl -ldl



Code :

#include <stdio.h>
#include <openssl/bn.h>

void Mont_exp(unsigned char *x,unsigned char *n,unsigned char * m,int
base,unsigned char *A,int *length);

int main(int argc , char *argv[])
{
        unsigned char A[8096];
        int base=16,length;
        unsigned char *x=(unsigned char
*)"400AAAAAAAAABBBBBBBBBCCCCDDDDDDDEEEEEEEEEEEEFFFFFFFFFFAAAAAAAAAAAA62626";
        unsigned char *n=(unsigned char
*)"1FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF8";
        unsigned char *m=(unsigned char
*)"3AFF00FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF";

        while (1)
        {
                Mont_exp(x,n,m,base,A,&length);
                printf("A is <%s> of length <%d>\n",A,length);
                memset(A,(char)0,8096);
        }
}

void Mont_exp(unsigned char *x,unsigned char *n,unsigned char * m,int
base,unsigned char *A,int *length)
{
        BIGNUM *a,*b,*c,*d;
        int i;
        BN_CTX *ctx;

        a=(BIGNUM * )BN_new();
        BN_hex2bn(&a,(const char*)&x[0]);

        b=(BIGNUM * )BN_new();
        BN_hex2bn(&b,(const char*)&n[0]);

        c=(BIGNUM * )BN_new();
        BN_hex2bn(&c,(const char*)&m[0]);

        d=(BIGNUM * )BN_new();

        ctx=(BN_CTX *)BN_CTX_new();
        if (ctx == NULL) exit(1);
        if (!BN_mod_exp(d,a,b,c,ctx))
        {
                BN_free(a);
                BN_free(b);
                BN_free(c);
                BN_free(d);
                BN_CTX_free(ctx);
                return;
        }
        strcpy((char *)A,(const char *)BN_bn2hex(d));

        *length = strlen((const char *)A);

        BN_free(a);
        BN_free(b);
        BN_free(c);
        BN_free(d);
        BN_CTX_free(ctx);
        return;
}





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