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57869d524a
* Add Chaincode Delegation BIP * Update license to BSD-3-Clause and expand blinded signing documentation * Address initial PR comments * Update with BIP number assignment * Fix delegator_sign test vector * Upgrade secp256k1lab and add license file - Upgrade vendored secp256k1lab to commit a265da1 (adds type annotations) - Add COPYING file to satisfy MIT license requirements - Document secp256k1lab commit reference in BIP text * Fix type checker and linter issues in reference implementation - Fix TweakContext to use Scalar types for gacc/tacc - Replace HashFunction enum with Callable type alias - Fix bytearray to bytes conversion in blind_sign - Move imports to top of file - Fix boolean comparison style (use 'not' instead of '== False') - Add proper type annotations and casts for dict handling - Remove unused imports and type ignore comments * Address PR review comments on terminology and clarity - Add intro explaining delegation naming (chain code is delegated, not signing authority) - Reorder terminology to list Delegator before Delegatee - Replace "quorum" with clearer "can co-sign for UTXOs" language - Clarify derivation constraints in terms of delegatee's extended key - Rename "Delegatee Signing" section to "Signing Modes" - Fix "delegatee can apply" to "delegator can produce" (line 112) - Replace undefined "caller" with "delegatee" (line 173) - Clarify "Change outputs" to "Tweaks for change outputs" (line 98) - Add note that message is separate from CCD bundle - Add note on application-specific verification (addresses, amounts) - Add transition sentence clarifying non-concurrent protocol scope * Add changelog entry for 0.1.3 * Fix header: use Authors (plural) for multiple authors * Fix BIP header format for CI compliance - Change Type from 'Standards Track' to 'Specification' (valid type) - Change 'Created' to 'Assigned' (correct field name per BIP format) - Change 'Post-History' to 'Discussion' (recognized field in buildtable.pl) * Apply suggestion from @murchandamus --------- Co-authored-by: Jesse Posner <jesse.posner@gmail.com>
25 lines
645 B
Python
25 lines
645 B
Python
import hashlib
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# This implementation can be sped up by storing the midstate after hashing
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# tag_hash instead of rehashing it all the time.
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def tagged_hash(tag: str, msg: bytes) -> bytes:
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tag_hash = hashlib.sha256(tag.encode()).digest()
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return hashlib.sha256(tag_hash + tag_hash + msg).digest()
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def bytes_from_int(x: int) -> bytes:
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return x.to_bytes(32, byteorder="big")
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def xor_bytes(b0: bytes, b1: bytes) -> bytes:
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return bytes(x ^ y for (x, y) in zip(b0, b1))
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def int_from_bytes(b: bytes) -> int:
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return int.from_bytes(b, byteorder="big")
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def hash_sha256(b: bytes) -> bytes:
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return hashlib.sha256(b).digest()
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