github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/identity/verifier.go (about)

     1  /*
     2   * Copyright (C) 2017 The "MysteriumNetwork/node" Authors.
     3   *
     4   * This program is free software: you can redistribute it and/or modify
     5   * it under the terms of the GNU General Public License as published by
     6   * the Free Software Foundation, either version 3 of the License, or
     7   * (at your option) any later version.
     8   *
     9   * This program is distributed in the hope that it will be useful,
    10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12   * GNU General Public License for more details.
    13   *
    14   * You should have received a copy of the GNU General Public License
    15   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    16   */
    17  
    18  package identity
    19  
    20  // VerifierFactory callback returning Verifier
    21  type VerifierFactory func(id Identity) Verifier
    22  
    23  // Verifier checks message's sanity
    24  type Verifier interface {
    25  	Verify(message []byte, signature Signature) (bool, Identity)
    26  }
    27  
    28  // NewVerifierSigned constructs Verifier which:
    29  //   - checks signature's sanity
    30  //   - checks if message was unchanged by middleman
    31  func NewVerifierSigned() *verifierSigned {
    32  	return &verifierSigned{NewExtractor()}
    33  }
    34  
    35  // NewVerifierIdentity constructs Verifier which:
    36  //   - checks signature's sanity
    37  //   - checks if message was unchanged by middleman
    38  //   - checks if message is from exact identity
    39  func NewVerifierIdentity(peerID Identity) *verifierIdentity {
    40  	return &verifierIdentity{NewExtractor(), peerID}
    41  }
    42  
    43  type verifierSigned struct {
    44  	extractor Extractor
    45  }
    46  
    47  func (verifier *verifierSigned) Verify(message []byte, signature Signature) (bool, Identity) {
    48  	identity, err := verifier.extractor.Extract(message, signature)
    49  	return err == nil, identity
    50  }
    51  
    52  type verifierIdentity struct {
    53  	extractor Extractor
    54  	peerID    Identity
    55  }
    56  
    57  func (verifier *verifierIdentity) Verify(message []byte, signature Signature) (bool, Identity) {
    58  	identity, err := verifier.extractor.Extract(message, signature)
    59  	if err != nil {
    60  		return false, identity
    61  	}
    62  
    63  	return identity == verifier.peerID, identity
    64  }