github.com/bartle-stripe/trillian@v1.2.1/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  }