package crypto import ( "bytes" "crypto/sha256" "fmt" secp256k1 "github.com/btcsuite/btcd/btcec" "github.com/tendermint/ed25519" "github.com/tendermint/ed25519/extra25519" cmn "github.com/tendermint/tmlibs/common" "golang.org/x/crypto/ripemd160" ) // An address is a []byte, but hex-encoded even in JSON. // []byte leaves us the option to change the address length. // Use an alias so Unmarshal methods (with ptr receivers) are available too. type Address = cmn.HexBytes func PubKeyFromBytes(pubKeyBytes []byte) (pubKey PubKey, err error) { err = cdc.UnmarshalBinaryBare(pubKeyBytes, &pubKey) return } //---------------------------------------- type PubKey interface { Address() Address Bytes() []byte VerifyBytes(msg []byte, sig Signature) bool Equals(PubKey) bool } //------------------------------------- var _ PubKey = PubKeyEd25519{} // Implements PubKeyInner type PubKeyEd25519 [32]byte func (pubKey PubKeyEd25519) Address() Address { // append type byte hasher := ripemd160.New() hasher.Write(pubKey.Bytes()) // does not error return Address(hasher.Sum(nil)) } func (pubKey PubKeyEd25519) Bytes() []byte { bz, err := cdc.MarshalBinaryBare(pubKey) if err != nil { panic(err) } return bz } func (pubKey PubKeyEd25519) VerifyBytes(msg []byte, sig_ Signature) bool { // make sure we use the same algorithm to sign sig, ok := sig_.(SignatureEd25519) if !ok { return false } pubKeyBytes := [32]byte(pubKey) sigBytes := [64]byte(sig) return ed25519.Verify(&pubKeyBytes, msg, &sigBytes) } // For use with golang/crypto/nacl/box // If error, returns nil. func (pubKey PubKeyEd25519) ToCurve25519() *[32]byte { keyCurve25519, pubKeyBytes := new([32]byte), [32]byte(pubKey) ok := extra25519.PublicKeyToCurve25519(keyCurve25519, &pubKeyBytes) if !ok { return nil } return keyCurve25519 } func (pubKey PubKeyEd25519) String() string { return fmt.Sprintf("PubKeyEd25519{%X}", pubKey[:]) } func (pubKey PubKeyEd25519) Equals(other PubKey) bool { if otherEd, ok := other.(PubKeyEd25519); ok { return bytes.Equal(pubKey[:], otherEd[:]) } else { return false } } //------------------------------------- var _ PubKey = PubKeySecp256k1{} // Implements PubKey. // Compressed pubkey (just the x-cord), // prefixed with 0x02 or 0x03, depending on the y-cord. type PubKeySecp256k1 [33]byte // Implements Bitcoin style addresses: RIPEMD160(SHA256(pubkey)) func (pubKey PubKeySecp256k1) Address() Address { hasherSHA256 := sha256.New() hasherSHA256.Write(pubKey[:]) // does not error sha := hasherSHA256.Sum(nil) hasherRIPEMD160 := ripemd160.New() hasherRIPEMD160.Write(sha) // does not error return Address(hasherRIPEMD160.Sum(nil)) } func (pubKey PubKeySecp256k1) Bytes() []byte { bz, err := cdc.MarshalBinaryBare(pubKey) if err != nil { panic(err) } return bz } func (pubKey PubKeySecp256k1) VerifyBytes(msg []byte, sig_ Signature) bool { // and assert same algorithm to sign and verify sig, ok := sig_.(SignatureSecp256k1) if !ok { return false } pub__, err := secp256k1.ParsePubKey(pubKey[:], secp256k1.S256()) if err != nil { return false } sig__, err := secp256k1.ParseDERSignature(sig[:], secp256k1.S256()) if err != nil { return false } return sig__.Verify(Sha256(msg), pub__) } func (pubKey PubKeySecp256k1) String() string { return fmt.Sprintf("PubKeySecp256k1{%X}", pubKey[:]) } func (pubKey PubKeySecp256k1) Equals(other PubKey) bool { if otherSecp, ok := other.(PubKeySecp256k1); ok { return bytes.Equal(pubKey[:], otherSecp[:]) } else { return false } }