This commit adds the ECDSA adaptor signature APIs:
- Encrypted Signing
Creates an adaptor signature, which includes a proof to verify the adaptor
signature.
- Encryption Verification
Verifies that the adaptor decryption key can be extracted from the adaptor
signature and the completed ECDSA signature.
- Signature Decryption
Derives an ECDSA signature from an adaptor signature and an adaptor decryption
key.
- Key Recovery
Extracts the adaptor decryption key from the complete signature and the adaptor
signature.
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