github.com/mre-fog/trillianxx@v1.1.2-0.20180615153820-ae375a99d36a/crypto/signatures.go (about) 1 // Copyright 2016 Google Inc. All Rights Reserved. 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 crypto 16 17 import ( 18 gocrypto "crypto" 19 "crypto/ecdsa" 20 "crypto/rsa" 21 22 "github.com/google/trillian/crypto/sigpb" 23 ) 24 25 // SignatureAlgorithm returns the algorithm used for this public key. 26 // Only ECDSA and RSA keys are supported. Other key types will return sigpb.DigitallySigned_ANONYMOUS. 27 func SignatureAlgorithm(k gocrypto.PublicKey) sigpb.DigitallySigned_SignatureAlgorithm { 28 switch k.(type) { 29 case *ecdsa.PublicKey: 30 return sigpb.DigitallySigned_ECDSA 31 case *rsa.PublicKey: 32 return sigpb.DigitallySigned_RSA 33 } 34 35 return sigpb.DigitallySigned_ANONYMOUS 36 }