Created
May 29, 2019 14:02
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crypto-js with go
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package main | |
import ( | |
"bytes" | |
"crypto/aes" | |
"crypto/cipher" | |
"crypto/md5" | |
crand "crypto/rand" | |
"encoding/base64" | |
"encoding/hex" | |
"fmt" | |
"github.com/tcolgate/gostikkit/evpkdf" | |
) | |
func main() { | |
b, _ := m() | |
md := hex.EncodeToString(b) | |
fmt.Printf("md5: %s\n", md) | |
fmt.Printf("md5 base64: %s\n", base64.StdEncoding.EncodeToString(b)) | |
ciphertext := encryptCBC("scnace", md) | |
fmt.Printf("ciphertext: %s\n", base64.StdEncoding.EncodeToString(ciphertext)) | |
// fmt.Printf("iv: %s\n", base64.StdEncoding.EncodeToString(iv)) | |
} | |
func m() ([]byte, error) { | |
hasher := md5.New() | |
if _, err := hasher.Write([]byte("hi")); err != nil { | |
return nil, err | |
} | |
return hasher.Sum(nil), nil | |
} | |
var opensslmagic = []byte{0x53, 0x61, 0x6c, 0x74, 0x65, 0x64, 0x5f, 0x5f} | |
func addSalt(ciphertext, salt []byte) []byte { | |
if len(salt) == 0 { | |
return ciphertext | |
} | |
return append(append(opensslmagic, salt...), ciphertext...) | |
} | |
func encryptCBC(plaintext string, passphares string) []byte { | |
salt := genChars(8) | |
keylen := 32 | |
key := make([]byte, keylen) | |
ivlen := aes.BlockSize | |
iv := make([]byte, ivlen) | |
keymat := evpkdf.New(md5.New, []byte(passphares), salt, keylen+ivlen, 1) | |
keymatbuf := bytes.NewReader(keymat) | |
n, err := keymatbuf.Read(key) | |
if n != keylen || err != nil { | |
panic("keymaterial was short reading key") | |
} | |
n, err = keymatbuf.Read(iv) | |
if n != ivlen || err != nil { | |
panic("keymaterial was short reading iv") | |
} | |
block, err := aes.NewCipher(key) | |
if err != nil { | |
panic(err) | |
} | |
padded, _ := zeroPadding([]byte(plaintext), block.BlockSize()) | |
ciphertext := make([]byte, len(padded)) | |
if _, err := crand.Read(iv); err != nil { | |
panic(err) | |
} | |
cbc := cipher.NewCBCEncrypter(block, iv) | |
cbc.CryptBlocks(ciphertext, padded) | |
fmt.Printf("cipher: %s\n", base64.StdEncoding.EncodeToString(ciphertext)) | |
fmt.Printf("iv: %v\n", base64.StdEncoding.EncodeToString(iv)) | |
fmt.Printf("key: %v\n", base64.StdEncoding.EncodeToString(key)) | |
return addSalt(ciphertext, salt) | |
} | |
func zeroPadding(data []byte, blocklen int) ([]byte, error) { | |
if blocklen <= 0 { | |
return nil, fmt.Errorf("invalid blocklen %d", blocklen) | |
} | |
padlen := uint8(1) | |
for ((len(data) + int(padlen)) % blocklen) != 0 { | |
padlen++ | |
} | |
if int(padlen) > blocklen { | |
panic(fmt.Sprintf("generated invalid padding length %v for block length %v", padlen, blocklen)) | |
} | |
pad := bytes.Repeat([]byte{byte(0)}, int(padlen)) | |
return append(data, pad...), nil | |
} | |
func pkcs7Pad(data []byte, blocklen int) ([]byte, error) { | |
if blocklen <= 0 { | |
return nil, fmt.Errorf("invalid blocklen %d", blocklen) | |
} | |
padlen := uint8(1) | |
for ((len(data) + int(padlen)) % blocklen) != 0 { | |
padlen++ | |
} | |
if int(padlen) > blocklen { | |
panic(fmt.Sprintf("generated invalid padding length %v for block length %v", padlen, blocklen)) | |
} | |
pad := bytes.Repeat([]byte{byte(padlen)}, int(padlen)) | |
return append(data, pad...), nil | |
} | |
var chars = []byte("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") | |
func genChars(n int) []byte { | |
out := make([]byte, n) | |
rs := make([]byte, n) | |
crand.Read(rs) | |
for i := 0; i < n; i++ { | |
out[i] = chars[uint(rs[i])%uint(len(chars))] | |
} | |
return out | |
} |
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console.log("md5: " + CryptoJS.MD5("hi").toString()); | |
console.log("md5 base64: " + CryptoJS.MD5("hi").toString(CryptoJS.enc.Base64)); | |
var key = CryptoJS.MD5("hi").toString(); | |
var t = CryptoJS.AES.encrypt("scnace", key, { | |
mode: CryptoJS.mode.CBC, | |
}); | |
console.log("cipher: " + t.ciphertext.toString(CryptoJS.enc.Base64)) | |
console.log("iv: " + t.iv.toString(CryptoJS.enc.Base64)) | |
console.log("key: " + t.key.toString(CryptoJS.enc.Base64)) | |
console.log("cipher text: " + t.toString()) | |
var dt = CryptoJS.AES.decrypt("U2FsdGVkX19Rc0JWT29CS5+kMaZgqhlZC1uCpm5KpPM=", "49f68a5c8493ec2c0bf489821c21fc3b"); | |
console.log("decrypto: " + dt) |
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