1 // Copyright 2021 The CUE Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package ed25519 16 17 import ( 18 "crypto/ed25519" 19 20 "cuelang.org/go/cue/errors" 21 "cuelang.org/go/cue/token" 22 ) 23 24 const ( 25 // PublicKeySize is the size of a public key in bytes. 26 PublicKeySize = 32 27 ) 28 29 // Valid verifies the provided signature of the message using the public key. 30 // An error is returned if and only if an invalid public key is provided. 31 func Valid(publicKey, message, signature []byte) (bool, error) { 32 if size := len(publicKey); size != PublicKeySize { 33 return false, errors.Newf(token.NoPos, "ed25519: publicKey must be 32 bytes") 34 } 35 return ed25519.Verify(publicKey, message, signature), nil 36 } 37