/
rsa_utils.go
90 lines (77 loc) · 2.62 KB
/
rsa_utils.go
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// Copyright 2015-present, Cyrill @ Schumacher.fm and the CoreStore contributors
//
// 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.
package csjwt
import (
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"github.com/corestoreio/errors"
)
// Parse PEM encoded PKCS1 or PKCS8 private key. Provide optionally a password
// if key is encrypted.
func parseRSAPrivateKeyFromPEM(privateKey []byte, password ...[]byte) (*rsa.PrivateKey, error) {
var prKeyPEM *pem.Block
if prKeyPEM, _ = pem.Decode(privateKey); prKeyPEM == nil {
return nil, errors.NotSupported.Newf(errKeyMustBePEMEncoded)
}
var block []byte
if x509.IsEncryptedPEMBlock(prKeyPEM) {
if len(password) != 1 || len(password[0]) == 0 {
return nil, errors.Empty.Newf(errKeyMissingPassword)
}
var errPEM error
if block, errPEM = x509.DecryptPEMBlock(prKeyPEM, password[0]); errPEM != nil {
return nil, errors.NotValid.Newf(errKeyDecryptPEMBlockFailed, errPEM)
}
} else {
block = prKeyPEM.Bytes
}
var err error
var parsedKey interface{}
if parsedKey, err = x509.ParsePKCS1PrivateKey(block); err != nil {
if parsedKey, err = x509.ParsePKCS8PrivateKey(block); err != nil {
return nil, errors.NotValid.Newf(errKeyParsePKCS8PrivateKeyFailed, err)
}
}
var pkey *rsa.PrivateKey
var ok bool
if pkey, ok = parsedKey.(*rsa.PrivateKey); !ok {
return nil, errors.NotValid.Newf(errKeyNonRSAPrivateKey)
}
return pkey, nil
}
// Parse PEM encoded PKCS1 or PKCS8 public key
func parseRSAPublicKeyFromPEM(key []byte) (*rsa.PublicKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, errors.NotSupported.Newf(errKeyMustBePEMEncoded)
}
// Parse the key
var parsedKey interface{}
if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err != nil {
if cert, err := x509.ParseCertificate(block.Bytes); err == nil {
parsedKey = cert.PublicKey
} else {
return nil, errors.NotValid.Newf(errKeyParseCertificateFailed, err)
}
}
var pkey *rsa.PublicKey
var ok bool
if pkey, ok = parsedKey.(*rsa.PublicKey); !ok {
return nil, errors.NotValid.Newf(errKeyNonRSAPrivateKey)
}
return pkey, nil
}