Play around with some testing of the min interface

.gitignore

@@ -15,7 +15,7 @@ inc/blst_aux.h*
 .vscode/
 *.json
 .clang-format
-bindings/*/_*.so
-bindings/python/ckzg.py
-bindings/python/c_kzg_wrap.c
+*bindings/*/_*.so
+*bindings/python/ckzg.py
+*bindings/python/*_wrap.c
 __pycache__

min-bindings/python/Makefile

@@ -0,0 +1,11 @@
+INCLUDE_DIRS = .. ../../min-src ../../inc
+INCLUDE_PY = $(shell python -c 'import sysconfig; print(sysconfig.get_config_var("INCLUDEPY"))')
+
+test: tests.py _ckzg.so
+	python $<
+
+_ckzg.so: c_kzg_4844_wrap.c ../../min-src/c_kzg_4844.o ../../lib/libblst.a
+	clang -O -Wall -shared -fPIC -Wl,-Bsymbolic -I${INCLUDE_PY} ${addprefix -I,${INCLUDE_DIRS}} -o $@ $^
+
+c_kzg_4844_wrap.c ckzg.py: ../c_kzg_4844.swg
+	swig -DSWIGWORDSIZE64 -O -Wall -python -outcurrentdir $<

min-bindings/python/tests.py

@@ -0,0 +1,67 @@
+import atexit
+import ckzg
+import random
+
+# 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
+n = 11
+p = 1
+
+powers = ckzg.BLSFieldElements(n)
+ckzg.compute_powers(powers.cast(), fr_from_int(x), n)
+
+for i in range(n):
+    assert p == int_from_fr(powers[i])
+    p *= x
+    p %= 2**256
+
+# Load a trusted setup
+
+ret, ts = ckzg.load_trusted_setup("../../src/trusted_setup.txt")
+assert ret == 0
+
+BLOB_SIZE = 4096
+
+# Commit to a blob
+
+blob = ckzg.BLSFieldElements(BLOB_SIZE)
+for i in range(BLOB_SIZE):
+    blob[i] = fr_from_int(random.randrange(0, 2**256))
+commitment = ckzg.blob_to_kzg_commitment(blob.cast(), ts)
+
+print('Tests passed')
+
+def cleanup():
+    ckzg.free_trusted_setup(ts)
+
+atexit.register(cleanup)