-
Notifications
You must be signed in to change notification settings - Fork 27
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
3 changed files
with
167 additions
and
5 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| /* | ||
| 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 octavia | ||
|
|
||
| import ( | ||
| "crypto/aes" | ||
| "crypto/cipher" | ||
| "crypto/rand" | ||
| "crypto/sha256" | ||
| "encoding/asn1" | ||
| "encoding/pem" | ||
| "fmt" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "golang.org/x/crypto/pbkdf2" | ||
| ) | ||
|
|
||
| var ( | ||
| // key derivation functions | ||
| oidPKCS5PBKDF2 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 5, 12} | ||
| oidPBES2 = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 5, 13} | ||
| oidHMACWithSHA256 = asn1.ObjectIdentifier{1, 2, 840, 113549, 2, 9} | ||
|
|
||
| // encryption | ||
| oidAES256CBC = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 3, 4, 1, 42} | ||
| ) | ||
|
|
||
| // Encrypted pkcs8 | ||
| // Based on https://github.com/youmark/pkcs8 | ||
| // MIT license | ||
| type prfParam struct { | ||
| Algo asn1.ObjectIdentifier | ||
| NullParam asn1.RawValue | ||
| } | ||
|
|
||
| type pbkdf2Params struct { | ||
| Salt []byte | ||
| IterationCount int | ||
| PrfParam prfParam `asn1:"optional"` | ||
| } | ||
|
|
||
| type pbkdf2Algorithms struct { | ||
| Algo asn1.ObjectIdentifier | ||
| PBKDF2Params pbkdf2Params | ||
| } | ||
|
|
||
| type pbkdf2Encs struct { | ||
| EncryAlgo asn1.ObjectIdentifier | ||
| IV []byte | ||
| } | ||
|
|
||
| type pbes2Params struct { | ||
| KeyDerivationFunc pbkdf2Algorithms | ||
| EncryptionScheme pbkdf2Encs | ||
| } | ||
|
|
||
| type encryptedlAlgorithmIdentifier struct { | ||
| Algorithm asn1.ObjectIdentifier | ||
| Parameters pbes2Params | ||
| } | ||
|
|
||
| type encryptedPrivateKeyInfo struct { | ||
| Algo encryptedlAlgorithmIdentifier | ||
| PrivateKey []byte | ||
| } | ||
|
|
||
| func EncryptPrivateKey(data, password []byte) (*pem.Block, error) { | ||
| pbkdf2_iterations := 600000 | ||
| aes256_keysize := 32 | ||
| aes256_blocksize := aes.BlockSize | ||
| data_length := len(data) | ||
| pad_size := aes256_blocksize - data_length%aes256_blocksize | ||
| // encrypted_size := data_length + pad_size | ||
|
|
||
| // Generate salt using random data | ||
| pbkdf2_salt := make([]byte, 16) | ||
| _, err := rand.Read(pbkdf2_salt) | ||
| if err != nil { | ||
| err = fmt.Errorf("error generating random data for salt for private key encryption: %w", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| iv := make([]byte, aes256_blocksize) | ||
| _, err = rand.Read(iv) | ||
| if err != nil { | ||
| err = fmt.Errorf("error generating random data for init vector for private key encryption: %w", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| key := pbkdf2.Key(password, pbkdf2_salt, pbkdf2_iterations, | ||
| aes256_keysize, sha256.New) | ||
| encrypted_block, err := aes.NewCipher(key) | ||
| if err != nil { | ||
| err = fmt.Errorf("error creating new cipher block for private key encryption: %w", err) | ||
| return nil, err | ||
| } | ||
|
|
||
| // crypt_source := make([]byte, encrypted_size) | ||
| // copy(crypt_source, data) | ||
| // // Set padding data according to RFC1423, 1.1 | ||
| // for i := data_length; i < encrypted_size; i++ { | ||
| // crypt_source[i] = byte(pad_size) | ||
| // } | ||
| // encrypted := make([]byte, encrypted_size) | ||
|
|
||
| // encrypter := cipher.NewCBCEncrypter(encrypted_block, iv) | ||
| // encrypter.CryptBlocks(encrypted, crypt_source) | ||
|
|
||
| encrypted := make([]byte, len(data), len(data)+pad_size) | ||
| // We could save this copy by encrypting all the whole blocks in | ||
| // the data separately, but it doesn't seem worth the additional | ||
| // code. | ||
| copy(encrypted, data) | ||
| // See RFC 1423, section 1.1 | ||
| for i := 0; i < pad_size; i++ { | ||
| encrypted = append(encrypted, byte(pad_size)) | ||
| } | ||
| encrypter := cipher.NewCBCEncrypter(encrypted_block, iv) | ||
| encrypter.CryptBlocks(encrypted, encrypted) | ||
|
|
||
| // Build encrypted ans1 data | ||
| pki := encryptedPrivateKeyInfo{ | ||
| Algo: encryptedlAlgorithmIdentifier{ | ||
| Algorithm: oidPBES2, | ||
| Parameters: pbes2Params{ | ||
| KeyDerivationFunc: pbkdf2Algorithms{ | ||
| Algo: oidPKCS5PBKDF2, | ||
| PBKDF2Params: pbkdf2Params{ | ||
| Salt: pbkdf2_salt, | ||
| IterationCount: pbkdf2_iterations, | ||
| PrfParam: prfParam{ | ||
| Algo: oidHMACWithSHA256, | ||
| }, | ||
| }, | ||
| }, | ||
| EncryptionScheme: pbkdf2Encs{ | ||
| EncryAlgo: oidAES256CBC, | ||
| IV: iv, | ||
| }, | ||
| }, | ||
| }, | ||
| PrivateKey: encrypted, | ||
| } | ||
|
|
||
| b, err := asn1.Marshal(pki) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "error marshaling encrypted key") | ||
| } | ||
| return &pem.Block{ | ||
| Type: "ENCRYPTED PRIVATE KEY", | ||
| Bytes: b, | ||
| }, nil | ||
| } |