27 lines
766 B
Go
27 lines
766 B
Go
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package delegated
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import (
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"fmt"
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"golang.org/x/crypto/sha3"
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)
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// EthAddressFromPubKey returns the Ethereum address corresponding to an
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// uncompressed secp256k1 public key.
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//
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// TODO move somewhere else, this likely doesn't belong here.
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func EthAddressFromPubKey(pubk []byte) ([]byte, error) {
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// if we get an uncompressed public key (that's what we get from the library,
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// but putting this check here for defensiveness), strip the prefix
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if pubk[0] != 0x04 {
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return nil, fmt.Errorf("expected first byte of secp256k1 to be 0x04 (uncompressed)")
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}
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pubk = pubk[1:]
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// Calculate the Ethereum address based on the keccak hash of the pubkey.
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hasher := sha3.NewLegacyKeccak256()
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hasher.Write(pubk)
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ethAddr := hasher.Sum(nil)[12:]
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return ethAddr, nil
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}
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