fixed unsave calculation of mpz_export length

diff --git a/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c b/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
index b6285da..5eb28cb 100644 (file)
--- a/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
+++ b/src/libstrongswan/plugins/gmp/gmp_rsa_private_key.c
@@ -373,11 +373,9 @@ static bool belongs_to(private_gmp_rsa_private_key_t *this, public_key_t *public
  */
 chunk_t gmp_mpz_to_asn1(const mpz_t value)
 {
-       size_t bits = mpz_sizeinbase(value, 2);  /* size in bits */
        chunk_t n;
 
-       n.len = 1 + bits / 8;  /* size in bytes */      
-       n.ptr = mpz_export(NULL, NULL, 1, n.len, 1, 0, value);
+       n.ptr = mpz_export(NULL, &n.len, 1, 1, 1, 0, value);
 
        return asn1_wrap(ASN1_INTEGER, "m", n);
 }