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[WIP] Schnorr/Taproot/Tapscript#758

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afk11 wants to merge 29 commits intoBit-Wasp:1.0Bit-Wasp/bitcoin-php:1.0from afk11:schnorrafk11/bitcoin-php:schnorrCopy head branch name to clipboard

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Commits on Dec 11, 2019

• Add phpecc backed Schnorr implementation

  

  Thomas Kerin

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• add ext-gmp as requirement to composer.json

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• EcAdapter: Add interfaces for Schnorr, and a secp256k1 backed implementation for our EcAdapter

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• TaprootHasher: Implement taproot transaction digest

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• Add schnorr signature verification methods to Checker

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• OutputScriptFactory: add method for taproot output scripts

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• XOnlyPublicKey: add constructor arg hasSquareY, returned during xonly_pubkey_from_pubkey

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• Implement PublicKey::asXOnlyPublicKey

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• Rewrite SchnorrSigner and implement missing Serializers

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• Add PrecomputedData for signatures, and refactor TaprootHasher in terms thereof

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• Taproot program validation. Excludes tapscript.

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• Extract executeWitnessProgram as fallthrough is overwhelming, and now conditional (taproot-keypath-spend)

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• TaprootHasher: tapscript modifications

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• Taproot script validation step 2: tapscript validation succeeds if OP_SUCCESSx present

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• Taproot script validation step 3: no max script length for tapscript

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• Taproot script validation step 3: initial stack is restricted to MAX_STACK_SIZE

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• Taproot script validation step 3: non-push opcode limit removed for tapscript

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• witness limit initial stack size

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• extract evalChecksig method and fix checkPayToContract in both EcAdapter implementations

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• validation weigh left: should include offset when initialized

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• tapscript execution: multisig opcodes disabled

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• tapscript execution: require MINIMALIF in tapscript

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• tapscript: implement OP_CHECKSIGADD

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• tapscript: update execContext with code sep opcode position

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• Move taproot constants to Interpreter namespace, not on Interpreter class

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• TaprootConstructTest: test taprootConstruct with various tree structures

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• wip & bug: ExecutionContext had a logic error

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• add TaprootTest file that was forgotten

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• travis: use schnorr version of secp256k1 / schnorrsig

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