http://www.benjiegillam.com/2009/07/osstatus-iphone-sdk-meanings/ より enum { errSecSuccess = 0, /* No error. */ errSecUnimplemented = -4, /* Function or operation not implemented. */ errSecParam = -50, /* One or more parameters passed to a function where not valid. */ errSecAllocate = -108, /* Failed to allocate memory. */ errSecNotAvailable = -25291, /* No keychain is available. You may need to re