tests: refactor: move random_ helpers from tests.c to testutil.h

Can be reviewed via `--color-moved=dimmed-zebra`.

src/tests.c

@@ -96,118 +96,6 @@ static void uncounting_illegal_callback_fn(const char* str, void* data) {
     (*p)--;
 }
 
-static void random_fe_magnitude(secp256k1_fe *fe, int m) {
-    secp256k1_fe zero;
-    int n = secp256k1_testrand_int(m + 1);
-    secp256k1_fe_normalize(fe);
-    if (n == 0) {
-        return;
-    }
-    secp256k1_fe_clear(&zero);
-    secp256k1_fe_negate(&zero, &zero, 0);
-    secp256k1_fe_mul_int_unchecked(&zero, n - 1);
-    secp256k1_fe_add(fe, &zero);
-#ifdef VERIFY
-    CHECK(fe->magnitude == n);
-#endif
-}
-
-static void random_fe_test(secp256k1_fe *x) {
-    unsigned char bin[32];
-    do {
-        secp256k1_testrand256_test(bin);
-        if (secp256k1_fe_set_b32_limit(x, bin)) {
-            return;
-        }
-    } while(1);
-}
-
-static void random_fe_non_zero_test(secp256k1_fe *fe) {
-    do {
-        random_fe_test(fe);
-    } while(secp256k1_fe_is_zero(fe));
-}
-
-static void random_ge_x_magnitude(secp256k1_ge *ge) {
-    random_fe_magnitude(&ge->x, SECP256K1_GE_X_MAGNITUDE_MAX);
-}
-
-static void random_ge_y_magnitude(secp256k1_ge *ge) {
-    random_fe_magnitude(&ge->y, SECP256K1_GE_Y_MAGNITUDE_MAX);
-}
-
-static void random_gej_x_magnitude(secp256k1_gej *gej) {
-    random_fe_magnitude(&gej->x, SECP256K1_GEJ_X_MAGNITUDE_MAX);
-}
-
-static void random_gej_y_magnitude(secp256k1_gej *gej) {
-    random_fe_magnitude(&gej->y, SECP256K1_GEJ_Y_MAGNITUDE_MAX);
-}
-
-static void random_gej_z_magnitude(secp256k1_gej *gej) {
-    random_fe_magnitude(&gej->z, SECP256K1_GEJ_Z_MAGNITUDE_MAX);
-}
-
-static void random_ge_test(secp256k1_ge *ge) {
-    secp256k1_fe fe;
-    do {
-        random_fe_test(&fe);
-        if (secp256k1_ge_set_xo_var(ge, &fe, secp256k1_testrand_bits(1))) {
-            secp256k1_fe_normalize(&ge->y);
-            break;
-        }
-    } while(1);
-    ge->infinity = 0;
-}
-
-static void random_ge_jacobian_test(secp256k1_gej *gej, const secp256k1_ge *ge) {
-    secp256k1_fe z2, z3;
-    random_fe_non_zero_test(&gej->z);
-    secp256k1_fe_sqr(&z2, &gej->z);
-    secp256k1_fe_mul(&z3, &z2, &gej->z);
-    secp256k1_fe_mul(&gej->x, &ge->x, &z2);
-    secp256k1_fe_mul(&gej->y, &ge->y, &z3);
-    gej->infinity = ge->infinity;
-}
-
-static void random_gej_test(secp256k1_gej *gej) {
-    secp256k1_ge ge;
-    random_ge_test(&ge);
-    random_ge_jacobian_test(gej, &ge);
-}
-
-static void random_scalar_order_test(secp256k1_scalar *num) {
-    do {
-        unsigned char b32[32];
-        int overflow = 0;
-        secp256k1_testrand256_test(b32);
-        secp256k1_scalar_set_b32(num, b32, &overflow);
-        if (overflow || secp256k1_scalar_is_zero(num)) {
-            continue;
-        }
-        break;
-    } while(1);
-}
-
-static void random_scalar_order(secp256k1_scalar *num) {
-    do {
-        unsigned char b32[32];
-        int overflow = 0;
-        secp256k1_testrand256(b32);
-        secp256k1_scalar_set_b32(num, b32, &overflow);
-        if (overflow || secp256k1_scalar_is_zero(num)) {
-            continue;
-        }
-        break;
-    } while(1);
-}
-
-static void random_scalar_order_b32(unsigned char *b32) {
-    secp256k1_scalar num;
-    random_scalar_order(&num);
-    secp256k1_scalar_get_b32(b32, &num);
-}
-
 static void run_xoshiro256pp_tests(void) {
     {
         size_t i;

src/testutil.h

@@ -7,6 +7,7 @@
 #define SECP256K1_TESTUTIL_H
 
 #include "field.h"
+#include "group.h"
 #include "testrand.h"
 #include "util.h"
 
@@ -26,4 +27,116 @@ static void random_fe_non_zero(secp256k1_fe *nz) {
     } while (secp256k1_fe_is_zero(nz));
 }
 
+static void random_fe_magnitude(secp256k1_fe *fe, int m) {
+    secp256k1_fe zero;
+    int n = secp256k1_testrand_int(m + 1);
+    secp256k1_fe_normalize(fe);
+    if (n == 0) {
+        return;
+    }
+    secp256k1_fe_clear(&zero);
+    secp256k1_fe_negate(&zero, &zero, 0);
+    secp256k1_fe_mul_int_unchecked(&zero, n - 1);
+    secp256k1_fe_add(fe, &zero);
+#ifdef VERIFY
+    CHECK(fe->magnitude == n);
+#endif
+}
+
+static void random_fe_test(secp256k1_fe *x) {
+    unsigned char bin[32];
+    do {
+        secp256k1_testrand256_test(bin);
+        if (secp256k1_fe_set_b32_limit(x, bin)) {
+            return;
+        }
+    } while(1);
+}
+
+static void random_fe_non_zero_test(secp256k1_fe *fe) {
+    do {
+        random_fe_test(fe);
+    } while(secp256k1_fe_is_zero(fe));
+}
+
+static void random_ge_x_magnitude(secp256k1_ge *ge) {
+    random_fe_magnitude(&ge->x, SECP256K1_GE_X_MAGNITUDE_MAX);
+}
+
+static void random_ge_y_magnitude(secp256k1_ge *ge) {
+    random_fe_magnitude(&ge->y, SECP256K1_GE_Y_MAGNITUDE_MAX);
+}
+
+static void random_gej_x_magnitude(secp256k1_gej *gej) {
+    random_fe_magnitude(&gej->x, SECP256K1_GEJ_X_MAGNITUDE_MAX);
+}
+
+static void random_gej_y_magnitude(secp256k1_gej *gej) {
+    random_fe_magnitude(&gej->y, SECP256K1_GEJ_Y_MAGNITUDE_MAX);
+}
+
+static void random_gej_z_magnitude(secp256k1_gej *gej) {
+    random_fe_magnitude(&gej->z, SECP256K1_GEJ_Z_MAGNITUDE_MAX);
+}
+
+static void random_ge_test(secp256k1_ge *ge) {
+    secp256k1_fe fe;
+    do {
+        random_fe_test(&fe);
+        if (secp256k1_ge_set_xo_var(ge, &fe, secp256k1_testrand_bits(1))) {
+            secp256k1_fe_normalize(&ge->y);
+            break;
+        }
+    } while(1);
+    ge->infinity = 0;
+}
+
+static void random_ge_jacobian_test(secp256k1_gej *gej, const secp256k1_ge *ge) {
+    secp256k1_fe z2, z3;
+    random_fe_non_zero_test(&gej->z);
+    secp256k1_fe_sqr(&z2, &gej->z);
+    secp256k1_fe_mul(&z3, &z2, &gej->z);
+    secp256k1_fe_mul(&gej->x, &ge->x, &z2);
+    secp256k1_fe_mul(&gej->y, &ge->y, &z3);
+    gej->infinity = ge->infinity;
+}
+
+static void random_gej_test(secp256k1_gej *gej) {
+    secp256k1_ge ge;
+    random_ge_test(&ge);
+    random_ge_jacobian_test(gej, &ge);
+}
+
+static void random_scalar_order_test(secp256k1_scalar *num) {
+    do {
+        unsigned char b32[32];
+        int overflow = 0;
+        secp256k1_testrand256_test(b32);
+        secp256k1_scalar_set_b32(num, b32, &overflow);
+        if (overflow || secp256k1_scalar_is_zero(num)) {
+            continue;
+        }
+        break;
+    } while(1);
+}
+
+static void random_scalar_order(secp256k1_scalar *num) {
+    do {
+        unsigned char b32[32];
+        int overflow = 0;
+        secp256k1_testrand256(b32);
+        secp256k1_scalar_set_b32(num, b32, &overflow);
+        if (overflow || secp256k1_scalar_is_zero(num)) {
+            continue;
+        }
+        break;
+    } while(1);
+}
+
+static void random_scalar_order_b32(unsigned char *b32) {
+    secp256k1_scalar num;
+    random_scalar_order(&num);
+    secp256k1_scalar_get_b32(b32, &num);
+}
+
 #endif /* SECP256K1_TESTUTIL_H */