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33cb3c2 Add secret key extraction from keypair to constant time tests (Elichai Turkel)
36d9dc1 Add seckey extraction from keypair to the extrakeys tests (Elichai Turkel)
fc96aa7 Add a function to extract the secretkey from a keypair (Elichai Turkel)
Pull request description:
With schnorrsig if you need to tweak the secret key (for BIP32) you must use the keypair API to get compatible secret/public keys which you do by calling `secp256k1_keypair_xonly_tweak_add()`, but after that there's no currently a way to extract the secret key back for storage.
so I added a `secp256k1_keypair_seckey` function to extract the key
ACKs for top commit:
jonasnick:
ACK 33cb3c2
real-or-random:
ACK 33cb3c2 code inspection, tests pass
Tree-SHA512: 11212db38c8b87a87e2dc35c4d6993716867b45215b94b20522b1b3164ca63d4c6bf5192a6bff0e9267b333779cc8164844c56669a94e9be72df9ef025ffcfd4
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