Clarify and reduce iterations for sig testvectors

This is actually different from signature functests,
which only tests mlen=32. Can be fixed later as that does
not impact the testvectors.

crypto_sign/dilithium-iii/META.yml

@@ -3,7 +3,7 @@ type: signature
 claimed-nist-level: 3
 length-public-key: 1472
 length-signature: 2701
-testvectors-sha256: e1852a975842c44a683c914ed131d95bee9b786c36c41e47bb77d7dd3c0c07be
+testvectors-sha256: 0d9d7a41b24ab8b250c352fdb50318193f2f66c6c582d7721b785b1a4618b493
 principal-submitter: Vadim Lyubashevsky
 auxiliary-submitters:
   - Léo Ducas

test/crypto_sign/testvectors.c

@@ -6,7 +6,6 @@
 #include "api.h"
 #include "randombytes.h"
 
-#define NTESTS 100
 #define MAXMLEN 2048
 
 static void printbytes(const uint8_t *x, size_t xlen) {
@@ -43,7 +42,8 @@ int main(void) {
     int r;
     size_t i, k;
 
-    for (i = 0; i < MAXMLEN; i = (i == 0) ? i + 1 : i << 1) {
+    /* i = 0, 1, 4, 16, 64, 256, 1024 */
+    for (i = 0; i < MAXMLEN; i = (i == 0) ? i + 1 : i << 2) {
         randombytes(mi, i);
 
         crypto_sign_keypair(pk, sk);