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< / script > < / nav > < / div > < div class = "container mainContainer docsContainer" > < div class = "wrapper" > < div class = "post" > < header class = "postHeader" > < a class = "edit-page-link button" href = "https://github.com/bitcoin-s/bitcoin-s/blob/master/docs/crypto/adaptor-signatures.md" target = "_blank" rel = "noreferrer noopener" > Edit< / a > < h1 id = "__docusaurus" class = "postHeaderTitle" > Adaptor Signatures< / h1 > < / header > < article > < div > < span > < p > Bitcoin-S now has support for < a href = "https://github.com/discreetlogcontracts/dlcspecs/blob/03bf7095c2016e1ce9c9fb612920872d4456f179/ECDSA-adaptor.md" > ECDSA Adaptor Signatures< / a > .< / p >
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< p > There are four relevant functions to adaptor signatures:< / p >
< ul >
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< li > < code > sign< / code > (aka encrypt)
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< ul >
< li > This function belongs to < code > ECPrivateKey< / code > and creates an adaptor signature given a message (< code > ByteVector< / code > ) and an adaptor point (< code > ECPublicKey< / code > ).< / li >
< / ul > < / li >
< li > < code > verify< / code >
< ul >
< li > Verifies an adaptor signature given the signing public key, the message and the adaptor point.< / li >
< / ul > < / li >
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< li > < code > complete< / code > (aka decrypt)
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< ul >
< li > This function belongs to < code > ECPrivateKey< / code > and computes a valid ECDSA signature given a valid adaptor signature whose adaptor point is this private key's public key.< / li >
< / ul > < / li >
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< li > < code > extract< / code > (aka recover)
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< ul >
< li > This function belongs to < code > ECPublicKey< / code > and computes the adaptor secret (private key to this public key) given a valid adaptor signature for this adaptor point, and the valid ECDSA signature computed using < code > complete< / code > .< / li >
< / ul > < / li >
< / ul >
< p > The following code shows each function to do with adaptor signature usage:< / p >
< pre > < code class = "hljs css language-scala" > < span class = "hljs-comment" > // Alice generages an adaptor signature using her private key and the adaptor point< / span >
< span class = "hljs-keyword" > val< / span > adaptorSig = privKey.adaptorSign(adaptorPoint, msg)
< span class = "hljs-comment" > // Bob verifies this adaptor signature using Alice's public key and the adaptor point< / span >
require(pubKey.adaptorVerify(msg, adaptorPoint, adaptorSig))
< span class = "hljs-comment" > // Bob computes a valid ECDSA signature using the adaptorSignature, which he knows< / span >
< span class = "hljs-keyword" > val< / span > sig = adaptorSecret.completeAdaptorSignature(adaptorSig)
< span class = "hljs-comment" > // Anyone can validate this signature< / span >
require(pubKey.verify(msg, sig))
< span class = "hljs-comment" > // Alice can compute the adaptor secret from the signatures< / span >
< span class = "hljs-keyword" > val< / span > secret = adaptorPoint.extractAdaptorSecret(adaptorSig, sig)
require(secret == adaptorSecret)
< / code > < / pre >
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