/
paste.go
133 lines (113 loc) · 2.38 KB
/
paste.go
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package privatebin
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"golang.org/x/crypto/pbkdf2"
)
const (
specIterations = 100000
specKeySize = 256
specTagSize = 128
specAlgorithm = "aes"
specMode = "gcm"
specCompression = "none"
)
type PasteRequest struct {
V int `json:"v"`
AData []interface{} `json:"adata"`
Meta PasteRequestMeta `json:"meta"`
CT string `json:"ct"`
}
type PasteRequestMeta struct {
Expire string `json:"expire"`
}
type PasteResponse struct {
Status int `json:"status"`
ID string `json:"id"`
URL string `json:"url"`
DeleteToken string `json:"deletetoken"`
}
type PasteContent struct {
Paste string `json:"paste"`
}
type PasteSpec struct {
IV string
Salt string
Iterations int
KeySize int
TagSize int
Algorithm string
Mode string
Compression string
}
func (spec *PasteSpec) SpecArray() []interface{} {
return []interface{}{
spec.IV,
spec.Salt,
spec.Iterations,
spec.KeySize,
spec.TagSize,
spec.Algorithm,
spec.Mode,
spec.Compression,
}
}
type PasteData struct {
*PasteSpec
Data []byte
}
func (paste *PasteData) adata() []interface{} {
return []interface{}{
paste.SpecArray(),
"plaintext",
0,
0,
}
}
func GenerateRandomBytes(len int) (result []byte, err error) {
result = make([]byte, len)
_, err = rand.Read(result)
return result, err
}
func encrypt(master []byte, message []byte) (*PasteData, error) {
iv, err := GenerateRandomBytes(12)
if err != nil {
return nil, err
}
salt, err := GenerateRandomBytes(8)
if err != nil {
return nil, err
}
paste := &PasteData{
PasteSpec: &PasteSpec{
IV: base64.RawStdEncoding.EncodeToString(iv),
Salt: base64.RawStdEncoding.EncodeToString(salt),
Iterations: specIterations,
KeySize: specKeySize,
TagSize: specTagSize,
Algorithm: specAlgorithm,
Mode: specMode,
Compression: specCompression,
},
}
key := pbkdf2.Key(master, salt, paste.Iterations, 32, sha256.New)
adata, err := json.Marshal(paste.adata())
if err != nil {
return nil, err
}
c, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(c)
if err != nil {
return nil, err
}
data := gcm.Seal(nil, iv, message, adata)
paste.Data = data
return paste, nil
}