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Schnorr Signature Point#16

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nkohen wants to merge 11 commits intojonasnick:schnorrsigjonasnick/secp256k1:schnorrsigfrom nkohen:schnorrsig-sigpointnkohen/secp256k1:schnorrsig-sigpointCopy head branch name to clipboard

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Commits on Mar 20, 2020

• Add xonly_pubkeys which are serialized as 32 byte and whose Y coordinate is a quadratic residue

  jonasnick

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  43aee84

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• Add tweak functions for xonly_pubkeys that allow to add a tweak to a

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• Add chacha20 function

  

  apoelstra

  authored and

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• Add initialize_tagged to sha256 which initializes and writes the 64 byte string SHA256(tag)||SHA256(tag) into it.

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  a2a1b2c

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• Add BIP-340 nonce function

  jonasnick

  committed
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• Add schnorrsig module which implements BIP-340 compatible signing, verification and batch verification

  jonasnick

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• Add taproot test case to schnorrsig module

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• f add test for overflowing nonce (which is fine)

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• f make schnorrsig_sign constant time in edge cases

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• Add schnorrsig_sign to the valgrind ctime test

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Commits on Apr 9, 2020

• Implemented Schnorr signature point computation for Discreet Log Contracts

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