Add python helper code to swig interface

min-bindings/c_kzg_4844.swg

@@ -76,3 +76,34 @@
 
 %include "../min-src/c_kzg_4844.h"
 %include "../inc/blst.h"
+
+%pythoncode %{
+# Helper functions
+
+def fr_from_int(x):
+    r = []
+    while x > 0:
+        r.append(x % 2**64)
+        x //= 2**64
+    assert len(r) <= 4
+    while len(r) < 4:
+        r.append(0)
+    return BLSFieldElement_from_uint64s(tuple(r))
+
+def int_from_fr(fr):
+    digits = uint64s_from_BLSFieldElement(fr)
+    res, mult = 0, 1
+    for x in digits:
+        res += mult * x
+        mult *= 2**64
+    return res
+
+def poly_from_values(values):
+    ret, pptr = alloc_polynomial(len(values))
+    assert ret == 0
+    p = PolynomialEvalFormPtr_frompointer(pptr).value()
+    pvalues = BLSFieldElements_frompointer(p.values)
+    for i, c in enumerate(values):
+        pvalues[i] = fr_from_int(c)
+    return p
+%}

min-bindings/python/tests.py

@@ -3,35 +3,6 @@ import ckzg
 import random
 import ssz
 
-# Helper functions
-
-def fr_from_int(x):
-    r = []
-    while x > 0:
-        r.append(x % 2**64)
-        x //= 2**64
-    assert len(r) <= 4
-    while len(r) < 4:
-        r.append(0)
-    return ckzg.BLSFieldElement_from_uint64s(tuple(r))
-
-def int_from_fr(fr):
-    digits = ckzg.uint64s_from_BLSFieldElement(fr)
-    res, mult = 0, 1
-    for x in digits:
-        res += mult * x
-        mult *= 2**64
-    return res
-
-def poly_from_values(values):
-    ret, pptr = ckzg.alloc_polynomial(len(values))
-    assert ret == 0
-    p = ckzg.PolynomialEvalFormPtr_frompointer(pptr).value()
-    pvalues = ckzg.BLSFieldElements_frompointer(p.values)
-    for i, c in enumerate(values):
-        pvalues[i] = fr_from_int(c)
-    return p
-
 # Simple test of compute_powers
 
 x = 32930439
@@ -39,10 +10,10 @@ n = 11
 p = 1
 
 powers = ckzg.BLSFieldElements(n)
-ckzg.compute_powers(powers.cast(), fr_from_int(x), n)
+ckzg.compute_powers(powers.cast(), ckzg.fr_from_int(x), n)
 
 for i in range(n):
-    assert p == int_from_fr(powers[i])
+    assert p == ckzg.int_from_fr(powers[i])
     p *= x
     p %= 2**256
 
@@ -62,13 +33,13 @@ num_blobs = 3
 blobs = [ckzg.BLSFieldElements(BLOB_SIZE) for _ in range(num_blobs)]
 for i in range(num_blobs):
     for j in range(BLOB_SIZE):
-        blobs[i][j] = fr_from_int(random.randrange(0, 2**256))
+        blobs[i][j] = ckzg.fr_from_int(random.randrange(0, 2**256))
 kzg_commitments = [ckzg.blob_to_kzg_commitment(blob.cast(), ts) for blob in blobs]
 
 # Compute polynomial commitments for these blobs
 # We don't follow the spec exactly to get the hash, but it shouldn't matter since it's random data
 
-blobs_as_ints = [[int_from_fr(frs[i]) for i in range(BLOB_SIZE)] for frs in blobs]
+blobs_as_ints = [[ckzg.int_from_fr(frs[i]) for i in range(BLOB_SIZE)] for frs in blobs]
 kzg_commitments_as_bytes = []
 for c in kzg_commitments:
     a = ckzg.bytes(48)