Codesign returned unknown error -1=ffffffffffffffff
Had the same problem a while ago, adding
security set-key-partition-list -S apple-tool:,apple:,codesign: -s -k password ${KEYCHAIN}
solved it for me.
Got the same issue but while archiving directly from Xcode.Sharing the solution in case it helps.
Sometimes, Keychain seems to end up in a corrupted state. Using MacOS Sierra too.
Symptoms :
Relogin needed to access Accounts after restarting Xcode
Prompting for password while using Keychain Access for some operations
Keychain Access - Error while accessing login keychain via Change Settings for Keychain ...
What fixes it for me is locking and unlocking (password required) the involved Keychain, login in my case.
I am going to chip in as well as I had to try a few more things than the ones mentioned here: the problem was that keychain doesn't like SSH sessions. I had to execute these in my session to fix it:
security unlock-keychain -p MY_PASS ~/Library/Keychains/login.keychainsecurity set-key-partition-list -S apple-tool:,apple:,codesign: -s -k MY_PASS ~/Library/Keychains/login.keychainsecurity set-keychain-settings ~/Library/Keychains/login.keychainI've also removed my current certificates system/account certificates by removing my account from XCode (I use fastlane to do building) but I suspect that this shouldn't have impacted it.