internal/ethapi: add personal_sign and fix eth_sign to hash message (#2940)

This commit includes several API changes:

- The behavior of eth_sign is changed. It now accepts an arbitrary
  message, prepends the well-known string

        \x19Ethereum Signed Message:\n<length of message>

  hashes the result using keccak256 and calculates the signature of
  the hash. This breaks backwards compatability!
  
- personal_sign(hash, address [, password]) is added. It has the same
  semantics as eth_sign but also accepts a password. The private key
  used to sign the hash is temporarily unlocked in the scope of the
  request.
  
- personal_recover(message, signature) is added and returns the
  address for the account that created a signature.

1 files changed, 1 insertions, 1 deletions

diff --git a/common/registrar/ethreg/api.go b/common/registrar/ethreg/api.go
index 6dd0ef46f..10050a545 100644
--- a/common/registrar/ethreg/api.go
+++ b/common/registrar/ethreg/api.go
@@ -257,7 +257,7 @@ func (be *registryAPIBackend) Transact(fromStr, toStr, nonceStr, valueStr, gasSt
 		tx = types.NewTransaction(nonce, to, value, gas, price, data)
 	}
 
-	signature, err := be.am.Sign(from, tx.SigHash().Bytes())
+	signature, err := be.am.SignEthereum(from, tx.SigHash().Bytes())
 	if err != nil {
 		return "", err
 	}