diff --git a/ecdsa-verify.c b/ecdsa-verify.c index 05c174ec573fd4db2cb41ed71768422cb6d0d6b8..ab8e19f33e23402cb9c6e127a7ab1579927755a7 100644 --- a/ecdsa-verify.c +++ b/ecdsa-verify.c @@ -52,7 +52,7 @@ ecdsa_verify (const struct ecc_point *pub, /* For ECC_MUL_A_WBITS == 0, at most 1512 bytes. With ECC_MUL_A_WBITS == 4, currently needs 67 * ecc->size, at most 4824 bytes. Don't use stack allocation for this. */ - mp_limb_t *scratch = gmp_alloc_limbs (itch); + mp_limb_t *scratch; int res; #define rp scratch @@ -62,6 +62,8 @@ ecdsa_verify (const struct ecc_point *pub, if (mpz_sgn (signature->r) <= 0 || mpz_size (signature->r) > size || mpz_sgn (signature->s) <= 0 || mpz_size (signature->s) > size) return 0; + + scratch = gmp_alloc_limbs (itch); mpz_limbs_copy (rp, signature->r, size); mpz_limbs_copy (sp, signature->s, size);