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BIP375: validate PSBT_OUT_SP_V0_LABEL length

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This commit is contained in:
wangjingshuiku
2026-09-12 17:00:00 +08:00
parent bfc142f2b5
commit 7ccde10a3c
3 changed files with 18 additions and 0 deletions
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10
bip-0375/validator/validate_psbt.py
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@@ -46,6 +46,7 @@ def validate_psbt_structure(psbt: PSBT) -> Tuple[bool, str]:
Checks:
- Each output must have PSBT_OUT_SCRIPT or PSBT_OUT_SP_V0_INFO
- PSBT_OUT_SP_V0_LABEL requires PSBT_OUT_SP_V0_INFO
- SP_V0_LABEL must be 4 bytes (32-bit little-endian uint)
- SP_V0_INFO must be 66 bytes (33-byte scan key + 33-byte spend key)
- ECDH shares must be 33 bytes
- DLEQ proofs must be 64 bytes
@@ -73,6 +74,15 @@ def validate_psbt_structure(psbt: PSBT) -> Tuple[bool, str]:
f"Output {i} has PSBT_OUT_SP_V0_LABEL but missing PSBT_OUT_SP_V0_INFO",
)
# Validate SP_V0_LABEL field length
if has_sp_label:
sp_label = output_map[PSBT_OUT_SP_V0_LABEL]
if len(sp_label) != 4:
return (
False,
f"Output {i} PSBT_OUT_SP_V0_LABEL has wrong length ({len(sp_label)} bytes, expected 4)",
)
# Validate SP_V0_INFO field length
if has_sp_info:
sp_info = output_map[PSBT_OUT_SP_V0_INFO]