Public keys are 32 bytes long, and private keys are 64 bytes long. The Ed25519 functions check to make sure the key is the correct length before using them: h

Public keys are 32 bytes long, and private keys are 64 bytes long. The Ed25519 functions check to make sure the key is the correct length before using them: https://github.com/golang/go/blob/d4bfe006155ea0d9c2970e22fca5a027125c8a98/src/crypto/ed25519/ed25519.go#L204 https://github.com/golang/go/blob/d4bfe006155ea0d9c2970e22fc... The types would ideally use fixed-length arrays, but at the time the API was designed, Go didn't allow conversions between slices and array pointers, which would have made the API annoying to use: https://github.com/golang/go/issues/24376#issuecomment-372786394 https://github.com/golang/go/issues/24376#issuecomment-37278... Go is now adding support for such conversions, but the Ed25519 API can't be changed due to backwards compatibility guarantees.