Add transfer_from and approve function like erc20 in encrypted_balances module.
When you call approve function, you just prove the allowed amount is not over his balance like usual proving in transfer .
When you call transfer_from function, you need to prove the transferred_amount is not over allowed value instead of balance value.
The caller of transfer_from function will need the allowed user's proof generation key because the caller will decrease the allowed user's balance.
depending: #134
Add transfer_from and approve function like erc20 in encrypted_balances module.
When you call
approvefunction, you just prove theallowed amountis not over his balance like usual proving intransfer. When you calltransfer_fromfunction, you need to prove thetransferred_amountis not overallowedvalue instead ofbalancevalue.The caller of
transfer_fromfunction will need the allowed user's proof generation key because the caller will decrease the allowed user's balance.