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- extracted common Ecrecover func which is used in benthos-plugin, de…
…vices-api and vsd
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| package utils | ||
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| import ( | ||
| "fmt" | ||
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| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/crypto" | ||
| ) | ||
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| const sigLen = 65 | ||
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| var zeroAddr common.Address | ||
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| // Ecrecover mimics the ecrecover opcode, returning the address that signed | ||
| // hash with signature. sig must have length 65 and the last byte, the recovery | ||
| // byte usually denoted v, must be 27 or 28. | ||
| func Ecrecover(hash, sig []byte) (common.Address, error) { | ||
| if len(sig) != sigLen { | ||
| return zeroAddr, fmt.Errorf("signature has invalid length %d", len(sig)) | ||
| } | ||
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| // Defensive copy: the caller shouldn't have to worry about us modifying | ||
| // the signature. We adjust because crypto.Ecrecover demands 0 <= v <= 4. | ||
| fixedSig := make([]byte, sigLen) | ||
| copy(fixedSig, sig) | ||
| fixedSig[64] -= 27 | ||
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| rawPk, err := crypto.Ecrecover(hash, fixedSig) | ||
| if err != nil { | ||
| return zeroAddr, err | ||
| } | ||
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| pk, err := crypto.UnmarshalPubkey(rawPk) | ||
| if err != nil { | ||
| return zeroAddr, err | ||
| } | ||
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| return crypto.PubkeyToAddress(*pk), nil | ||
| } | ||
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| // VerifySignature godoc | ||
| // checks if the provided signature corresponds to the given message and Ethereum address. | ||
| // payload []byte The original message that was signed. | ||
| // signature string The signature that needs to be verified. | ||
| // ethAddr string The Ethereum address of the signer. | ||
| // @return bool Indicates whether the signature is valid or not. | ||
| // @return error If there was an issue during the verification process. | ||
| func VerifySignature(payload []byte, signature string, ethAddr string) (bool, error) { | ||
| addr := common.HexToAddress(ethAddr) | ||
| sig := common.FromHex(signature) | ||
| hash := crypto.Keccak256Hash(payload) | ||
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| recAddr, err := Ecrecover(hash.Bytes(), sig) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
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| return recAddr == addr, nil | ||
| } |
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