New functions BN_CTX_start(), BN_CTX_get(), BN_CTX_end() to access

[openssl.git] / crypto / bn / bn_exp2.c

diff --git a/crypto/bn/bn_exp2.c b/crypto/bn/bn_exp2.c
index 2d7bf8997d48631174f3e1e3854e56f0369c03c6..4f4e9e329989d5b415bba73dd14eda0a245e7f83 100644 (file)
--- a/crypto/bn/bn_exp2.c
+++ b/crypto/bn/bn_exp2.c
@@ -35,15 +35,19 @@ int BN_mod_exp2_mont(BIGNUM *rr, BIGNUM *a1, BIGNUM *p1, BIGNUM *a2,
                BNerr(BN_F_BN_MOD_EXP_MONT,BN_R_CALLED_WITH_EVEN_MODULUS);
                return(0);
                }
-       d= &(ctx->bn[ctx->tos++]);
-       r= &(ctx->bn[ctx->tos++]);
        bits1=BN_num_bits(p1);
        bits2=BN_num_bits(p2);
        if ((bits1 == 0) && (bits2 == 0))
                {
-               BN_one(r);
+               BN_one(rr);
                return(1);
                }
+
+       BN_CTX_start(ctx);
+       d = BN_CTX_get(ctx);
+       r = BN_CTX_get(ctx);
+       if (d == NULL || r == NULL) goto err;
+
        bits=(bits1 > bits2)?bits1:bits2;
 
        /* If this is not done, things will break in the montgomery
@@ -183,7 +187,7 @@ int BN_mod_exp2_mont(BIGNUM *rr, BIGNUM *a1, BIGNUM *p1, BIGNUM *a2,
        ret=1;
 err:
        if ((in_mont == NULL) && (mont != NULL)) BN_MONT_CTX_free(mont);
-       ctx->tos-=2;
+       BN_CTX_end(ctx);
        for (i=0; i<ts; i++)
                {
                for (j=0; j<ts; j++)