signer

Documentation

Overview

Copyright IBM Corp. 2016 All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Index

• type CryptoSigner
  • func (s *CryptoSigner) Init(csp bccsp.BCCSP, key bccsp.Key) error
  • func (s *CryptoSigner) Public() crypto.PublicKey
  • func (s *CryptoSigner) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) (signature []byte, err error)

Types

type CryptoSigner

type CryptoSigner struct {
	// contains filtered or unexported fields
}

CryptoSigner is the BCCSP-based implementation of a crypto.Signer

func (*CryptoSigner) Init

func (s *CryptoSigner) Init(csp bccsp.BCCSP, key bccsp.Key) error

Init initializes this CryptoSigner.

func (*CryptoSigner) Public

func (s *CryptoSigner) Public() crypto.PublicKey

Public returns the public key corresponding to the opaque, private key.

func (*CryptoSigner) Sign

func (s *CryptoSigner) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) (signature []byte, err error)

Sign signs digest with the private key, possibly using entropy from rand. For an RSA key, the resulting signature should be either a PKCS#1 v1.5 or PSS signature (as indicated by opts). For an (EC)DSA key, it should be a DER-serialised, ASN.1 signature structure.

Hash implements the SignerOpts interface and, in most cases, one can simply pass in the hash function used as opts. Sign may also attempt to type assert opts to other types in order to obtain algorithm specific values. See the documentation in each package for details.

Note that when a signature of a hash of a larger message is needed, the caller is responsible for hashing the larger message and passing the hash (as digest) and the hash function (as opts) to Sign.