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@ -3,8 +3,8 @@ package vm |
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import ( |
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"math/big" |
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"github.com/ethereum/go-ethereum/crypto" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/crypto" |
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) |
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type Address interface { |
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@ -61,15 +61,29 @@ func ripemd160Func(in []byte) []byte { |
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return common.LeftPadBytes(crypto.Ripemd160(in), 32) |
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} |
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func ecrecoverFunc(in []byte) []byte { |
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// In case of an invalid sig. Defaults to return nil
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defer func() { recover() }() |
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const EcRecoverInputLength = 128 |
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func ecrecoverFunc(in []byte) []byte { |
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// "in" is (hash, v, r, s), each 32 bytes
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// but for ecrecover we want (r, s, v)
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if len(in) < EcRecoverInputLength { |
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return nil |
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} |
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hash := in[:32] |
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v := common.BigD(in[32:64]).Bytes()[0] - 27 |
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// v is only a bit, but comes as 32 bytes from vm. We only need least significant byte
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encodedV := in[32:64] |
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v := encodedV[31] - 27 |
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if !(v == 0 || v == 1) { |
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return nil |
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} |
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sig := append(in[64:], v) |
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return common.LeftPadBytes(crypto.Sha3(crypto.Ecrecover(append(hash, sig...))[1:])[12:], 32) |
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pubKey := crypto.Ecrecover(append(hash, sig...)) |
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// secp256.go returns either nil or 65 bytes
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if pubKey == nil || len(pubKey) != 65 { |
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return nil |
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} |
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// the first byte of pubkey is bitcoin heritage
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return common.LeftPadBytes(crypto.Sha3(pubKey[1:])[12:], 32) |
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} |
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func memCpy(in []byte) []byte { |
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