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"""Convert the BIP-324 test vectors to secp256k1 code."""
import csv
import reference
import os
import sys
FILENAME_XSWIFTEC_INV_TEST = os.path.join(sys.path[0], 'xswiftec_inv_test_vectors.csv')
FILENAME_ELLSWIFT_DECODE_TEST = os.path.join(sys.path[0], 'ellswift_decode_test_vectors.csv')
def format_int(v):
"""Format 0 as "0", but other integers as 0x%08x."""
if v == 0:
return "0"
return f"0x{v:08x}"
def format_fe(fe):
"""Format a field element constant as SECP256K1_FE_CONST code."""
vals = [(int(fe) >> (32 * (7 - i))) & 0xffffffff for i in range(8)]
strs = ", ".join(format_int(v) for v in vals)
return f"SECP256K1_FE_CONST({strs})"
def output_xswiftec_inv_cases():
"""Generate lines corresponding to the xswiftec_inv test cases."""
with open(FILENAME_XSWIFTEC_INV_TEST, newline='', encoding='utf-8') as csvfile:
reader = csv.DictReader(csvfile)
print("xswiftec_inv cases:")
for row in reader:
u = int.from_bytes(bytes.fromhex(row['u']), 'big')
x = int.from_bytes(bytes.fromhex(row['x']), 'big')
pat = sum(1<<c for c in range(8) if row[f"case{c}_t"])
tstrs = []
for c in range(8):
tstrs.append(format_fe(int.from_bytes(bytes.fromhex(row[f"case{c}_t"]), 'big')))
print(f" {{0x{pat:02x}, {format_fe(u)}, {format_fe(x)}, {{{', '.join(tstrs)}}}}},")
print()
def output_ellswift_decode_cases():
"""Generate lines corresponding to the ellswift_decode test cases."""
with open(FILENAME_ELLSWIFT_DECODE_TEST, newline='', encoding='utf-8') as csvfile:
reader = csv.DictReader(csvfile)
print("ellswift_decode cases:")
for row in reader:
enc = bytes.fromhex(row['ellswift'])
tval = int.from_bytes(enc[32:], 'big') % reference.FE.SIZE
x = int.from_bytes(bytes.fromhex(row['x']), 'big')
encstr = ", ".join(f"0x{b:02x}" for b in enc)
print(f" {{{{{encstr}}}, {format_fe(x)}, {tval & 1}}},")
print()
output_xswiftec_inv_cases()
output_ellswift_decode_cases()
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