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