mirror of
https://github.com/DeBrosOfficial/orama.git
synced 2026-03-27 12:24:12 +00:00
53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
package auth
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import (
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"encoding/hex"
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"fmt"
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"strings"
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"github.com/ethereum/go-ethereum/crypto"
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)
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// VerifyEVM verifies an Ethereum personal_sign signature.
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func VerifyEVM(wallet, message, signatureHex string) error {
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// Remove 0x prefix if present
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sigHex := strings.TrimPrefix(signatureHex, "0x")
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sigBytes, err := hex.DecodeString(sigHex)
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if err != nil {
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return fmt.Errorf("failed to decode signature hex: %w", err)
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}
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if len(sigBytes) != 65 {
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return fmt.Errorf("invalid signature length: got %d, want 65", len(sigBytes))
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}
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// Ethereum personal_sign prefix
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prefixed := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(message), message)
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hash := crypto.Keccak256Hash([]byte(prefixed))
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// Fix recovery ID: some wallets return v=27/28, need v=0/1
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if sigBytes[64] >= 27 {
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sigBytes[64] -= 27
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}
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pubKeyBytes, err := crypto.Ecrecover(hash.Bytes(), sigBytes)
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if err != nil {
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return fmt.Errorf("ecrecover failed: %w", err)
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}
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pubKey, err := crypto.UnmarshalPubkey(pubKeyBytes)
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if err != nil {
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return fmt.Errorf("failed to unmarshal public key: %w", err)
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}
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recoveredAddr := crypto.PubkeyToAddress(*pubKey)
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expectedAddr := strings.ToLower(strings.TrimPrefix(wallet, "0x"))
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recoveredHex := strings.ToLower(recoveredAddr.Hex()[2:])
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if recoveredHex != expectedAddr {
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return fmt.Errorf("signature verification failed: recovered %s, expected %s", recoveredHex, expectedAddr)
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}
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return nil
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}
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