Fixes typo in ecdsa error message (#373)

Author: tjs-cinemo

ecdsa.go

@@ -62,7 +62,7 @@ func (m *SigningMethodECDSA) Verify(signingString string, sig []byte, key interf
 case*ecdsa.PublicKey:
 ecdsaKey=k
 default:
-returnnewError("ECDSA verify expects *ecsda.PublicKey", ErrInvalidKeyType)
+returnnewError("ECDSA verify expects *ecdsa.PublicKey", ErrInvalidKeyType)
  }
 
 iflen(sig) !=2*m.KeySize {
@@ -96,7 +96,7 @@ func (m *SigningMethodECDSA) Sign(signingString string, key interface{}) ([]byte
 case*ecdsa.PrivateKey:
 ecdsaKey=k
 default:
-returnnil, newError("ECDSA sign expects *ecsda.PrivateKey", ErrInvalidKeyType)
+returnnil, newError("ECDSA sign expects *ecdsa.PrivateKey", ErrInvalidKeyType)
  }
 
 // Create the hasher