Hide BN_CTX structure details.

[openssl.git] / crypto / engine / hw_atalla.c

diff --git a/crypto/engine/hw_atalla.c b/crypto/engine/hw_atalla.c
index 9cd9bac..8410551 100644 (file)
--- a/crypto/engine/hw_atalla.c
+++ b/crypto/engine/hw_atalla.c
@@ -318,11 +318,12 @@ static int atalla_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                goto err;
        }
        /* Prepare the params */
+       BN_CTX_start(ctx);
        modulus = BN_CTX_get(ctx);
        exponent = BN_CTX_get(ctx);
        argument = BN_CTX_get(ctx);
        result = BN_CTX_get(ctx);
-       if(!modulus || !exponent || !argument || !result)
+       if (!result)
        {
                ENGINEerr(ENGINE_F_ATALLA_MOD_EXP,ENGINE_R_BN_CTX_FULL);
                goto err;
@@ -360,10 +361,7 @@ static int atalla_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
        BN_bin2bn((unsigned char *)result->d, numbytes, r);
        to_return = 1;
 err:
-       if(modulus) ctx->tos--;
-       if(exponent) ctx->tos--;
-       if(argument) ctx->tos--;
-       if(result) ctx->tos--;
+       BN_CTX_end(ctx);
        return to_return;
        }