github.com/gagliardetto/solana-go@v1.11.0/vault/passphrase.go (about)

     1  // Copyright 2020 dfuse Platform Inc.
     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 vault
    16  
    17  import (
    18  	crypto_rand "crypto/rand"
    19  	"encoding/base64"
    20  	"fmt"
    21  	"io"
    22  
    23  	"golang.org/x/crypto/nacl/secretbox"
    24  )
    25  
    26  type PassphraseBoxer struct {
    27  	passphrase string
    28  }
    29  
    30  func NewPassphraseBoxer(password string) *PassphraseBoxer {
    31  	return &PassphraseBoxer{
    32  		passphrase: password,
    33  	}
    34  }
    35  
    36  func (b *PassphraseBoxer) WrapType() string {
    37  	return "passphrase"
    38  }
    39  
    40  func (b *PassphraseBoxer) Seal(in []byte) (string, error) {
    41  	var nonce [nonceLength]byte
    42  	if _, err := io.ReadFull(crypto_rand.Reader, nonce[:]); err != nil {
    43  		return "", err
    44  	}
    45  
    46  	salt := make([]byte, saltLength)
    47  	if _, err := io.ReadFull(crypto_rand.Reader, salt); err != nil {
    48  		return "", err
    49  	}
    50  	secretKey := deriveKey(b.passphrase, salt)
    51  	prefix := append(salt, nonce[:]...)
    52  
    53  	cipherText := secretbox.Seal(prefix, in, &nonce, &secretKey)
    54  
    55  	return base64.RawStdEncoding.EncodeToString(cipherText), nil
    56  }
    57  
    58  func (b *PassphraseBoxer) Open(in string) ([]byte, error) {
    59  	buf, err := base64.RawStdEncoding.DecodeString(in)
    60  	if err != nil {
    61  		return []byte{}, err
    62  	}
    63  
    64  	salt := make([]byte, saltLength)
    65  	copy(salt, buf[:saltLength])
    66  	var nonce [nonceLength]byte
    67  	copy(nonce[:], buf[saltLength:nonceLength+saltLength])
    68  
    69  	secretKey := deriveKey(b.passphrase, salt)
    70  	decrypted, ok := secretbox.Open(nil, buf[nonceLength+saltLength:], &nonce, &secretKey)
    71  	if !ok {
    72  		return []byte{}, fmt.Errorf("failed to decrypt")
    73  	}
    74  	return decrypted, nil
    75  }