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Merge pull request #1109 from Crypt-iQ/tuple_fix_04232021

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BIP 341: fix tuple index in taproot_tweak_pubkey
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kallewoof 2021-06-13 12:38:32 +09:00 committed by GitHub
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@ -173,7 +173,7 @@ First, we define <code>taproot_tweak_pubkey</code> for 32-byte [[bip-0340.mediaw
The function returns a bit indicating the tweaked public key's Y coordinate as well as the public key byte array. The function returns a bit indicating the tweaked public key's Y coordinate as well as the public key byte array.
The parity bit will be required for spending the output with a script path. The parity bit will be required for spending the output with a script path.
In order to allow spending with the key path, we define <code>taproot_tweak_seckey</code> to compute the secret key for a tweaked public key. In order to allow spending with the key path, we define <code>taproot_tweak_seckey</code> to compute the secret key for a tweaked public key.
For any byte string <code>h</code> it holds that <code>taproot_tweak_pubkey(pubkey_gen(seckey), h)[0] == pubkey_gen(taproot_tweak_seckey(seckey, h))</code>. For any byte string <code>h</code> it holds that <code>taproot_tweak_pubkey(pubkey_gen(seckey), h)[1] == pubkey_gen(taproot_tweak_seckey(seckey, h))</code>.
<source lang="python"> <source lang="python">
def taproot_tweak_pubkey(pubkey, h): def taproot_tweak_pubkey(pubkey, h):
@ -219,7 +219,7 @@ def taproot_output_script(internal_pubkey, script_tree):
h = bytes() h = bytes()
else: else:
_, h = taproot_tree_helper(script_tree) _, h = taproot_tree_helper(script_tree)
output_pubkey, _ = taproot_tweak_pubkey(internal_pubkey, h) _, output_pubkey = taproot_tweak_pubkey(internal_pubkey, h)
return bytes([0x51, 0x20]) + output_pubkey return bytes([0x51, 0x20]) + output_pubkey
</source> </source>