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Blowfish ​

Blowfish is a symmetric encryption algorithm that supports variable-length keys, with key lengths from 1 to 56 bytes. dongle supports standard and streaming Blowfish encryption and provides multiple block modes, padding modes, and output formats.

Supported block modes:

  • CBC (Cipher Block Chaining): Cipher Block Chaining mode, requires setting key Key, initialization vector IV (8 bytes), and padding mode Padding
  • ECB (Electronic Codebook): Electronic Codebook mode, requires setting key Key and padding mode Padding
  • CTR (Counter): Counter mode, requires setting key Key and initialization vector IV (8 bytes)
  • CFB (Cipher Feedback): Cipher Feedback mode, requires setting key Key and initialization vector IV (8 bytes)
  • OFB (Output Feedback): Output Feedback mode, requires setting key Key and initialization vector IV (8 bytes)

Note: Blowfish algorithm does not support GCM (Galois/Counter Mode). This is because GCM mode requires a cipher algorithm with 128-bit block size, while Blowfish only has 64-bit block size (8 bytes). This is a technical limitation of cryptographic standards, not an implementation issue.

Supported padding modes:

  • No: No padding, plaintext length must be a multiple of 8
  • Zero: Zero padding, fills with zero bytes to block boundary, if plaintext length is not a multiple of 8, fills with 0x00 bytes
  • PKCS7: PKCS#7 padding, most commonly used padding method, fills with N bytes of value N, where N is the number of padding bytes
  • PKCS5: PKCS#5 padding, suitable for 8-byte block size, fills with N bytes of value N, where N is the number of padding bytes
  • AnsiX923: ANSI X.923 padding, fills with 0x00 except the last byte, the last byte indicates the number of padding bytes
  • ISO97971: ISO/IEC 9797-1 padding, first byte is 0x80, rest filled with 0x00
  • ISO10126: ISO/IEC 10126 padding, fills with random bytes except the last byte, the last byte indicates the number of padding bytes
  • ISO78164: ISO/IEC 7816-4 padding, first byte is 0x80, rest filled with 0x00
  • Bit: Bit padding, adds a 1 bit at the end of plaintext, then fills with 0 bits to block boundary

Import related modules:

go
import (
    "github.com/dromara/dongle"
    "github.com/dromara/dongle/crypto/cipher"
)

CBC Mode ​

Create Cipher ​

go
c := cipher.NewBlowfishCipher(cipher.CBC)
// Set key (1-56 bytes)
c.SetKey([]byte("1234567890123456"))
// Set initialization vector (8 bytes)
c.SetIV([]byte("87654321"))
// Set padding mode (optional, defaults to PKCS7, only CBC/ECB block modes require padding mode)
c.SetPadding(cipher.PKCS7)

Encrypt Data ​

Input Data

go
// Input string
encrypter := dongle.Encrypt.FromString("hello world").ByBlowfish(c)
// Input byte slice
encrypter := dongle.Encrypt.FromBytes([]byte("hello world")).ByBlowfish(c)
// Input file stream
file, _ := os.Open("test.txt")
encrypter := dongle.Encrypt.FromFile(file).ByBlowfish(c)

// Check encryption error
if encrypter.Error != nil {
	fmt.Printf("Encryption error: %v\n", encrypter.Error)
	return
}

Output Data

go
// Output hex-encoded string
encrypter.ToHexString() // 7fae94fd1a8b880d8d5454dd8df30c40
// Output hex-encoded byte slice
encrypter.ToHexBytes()   // []byte("7fae94fd1a8b880d8d5454dd8df30c40")

// Output base64-encoded string
encrypter.ToBase64String() // f66U/RqLiA2NVFTdjfMMQA==
// Output base64-encoded byte slice
encrypter.ToBase64Bytes()   // []byte("f66U/RqLiA2NVFTdjfMMQA==")

// Output raw string
encrypter.ToRawString()
// Output raw byte slice
encrypter.ToRawBytes()

Decrypt Data ​

Input Data

go
// Input hex-encoded string
decrypter := dongle.Decrypt.FromHexString(hexString).ByBlowfish(c)
// Input hex-encoded byte slice
decrypter := dongle.Decrypt.FromHexBytes(hexBytes).ByBlowfish(c)
// Input hex-encoded file stream
file, _ := os.Open("encrypted.hex")
decrypter := dongle.Decrypt.FromHexFile(file).ByBlowfish(c)

// Input base64-encoded string
decrypter := dongle.Decrypt.FromBase64String(base64String).ByBlowfish(c)
// Input base64-encoded byte slice
decrypter := dongle.Decrypt.FromBase64Bytes(base64Bytes).ByBlowfish(c)
// Input base64-encoded file stream
file, _ := os.Open("encrypted.base64")
decrypter := dongle.Decrypt.FromBase64File(file).ByBlowfish(c)

// Input raw string
decrypter := dongle.Decrypt.FromRawString(rawString).ByBlowfish(c)
// Input raw byte slice
decrypter := dongle.Decrypt.FromRawBytes(rawBytes).ByBlowfish(c)
// Input raw file stream
file, _ := os.Open("encrypted.bin")
decrypter := dongle.Decrypt.FromRawFile(file).ByBlowfish(c)

// Check decryption error
if decrypter.Error != nil {
	fmt.Printf("Decryption error: %v\n", decrypter.Error)
	return
}

Output Data

go
// Output decrypted string
decrypter.ToString() // hello world
// Output decrypted byte slice
decrypter.ToBytes()  // []byte("hello world")

ECB Mode ​

Create Cipher ​

go
c := cipher.NewBlowfishCipher(cipher.ECB)
// Set key (1-56 bytes)
c.SetKey([]byte("1234567890123456"))
// Set padding mode (optional, defaults to PKCS7, only CBC/ECB block modes require padding mode)
c.SetPadding(cipher.PKCS7)

Encrypt Data ​

Input Data

go
// Input string
encrypter := dongle.Encrypt.FromString("hello world").ByBlowfish(c)
// Input byte slice
encrypter := dongle.Encrypt.FromBytes([]byte("hello world")).ByBlowfish(c)
// Input file stream
file, _ := os.Open("test.txt")
encrypter := dongle.Encrypt.FromFile(file).ByBlowfish(c)

// Check encryption error
if encrypter.Error != nil {
	fmt.Printf("Encryption error: %v\n", encrypter.Error)
	return
}

Output Data

go
// Output hex-encoded string
encrypter.ToHexString() // 7fae94fd1a8b880d8d5454dd8df30c40
// Output hex-encoded byte slice
encrypter.ToHexBytes()   // []byte("7fae94fd1a8b880d8d5454dd8df30c40")

// Output base64-encoded string
encrypter.ToBase64String() // f66U/RqLiA2NVFTdjfMMQA==
// Output base64-encoded byte slice
encrypter.ToBase64Bytes()   // []byte("f66U/RqLiA2NVFTdjfMMQA==")

// Output raw string
encrypter.ToRawString()
// Output raw byte slice
encrypter.ToRawBytes()

Decrypt Data ​

Input Data

go
// Input hex-encoded string
decrypter := dongle.Decrypt.FromHexString(hexString).ByBlowfish(c)
// Input hex-encoded byte slice
decrypter := dongle.Decrypt.FromHexBytes(hexBytes).ByBlowfish(c)
// Input hex-encoded file stream
file, _ := os.Open("encrypted.hex")
decrypter := dongle.Decrypt.FromHexFile(file).ByBlowfish(c)

// Input base64-encoded string
decrypter := dongle.Decrypt.FromBase64String(base64String).ByBlowfish(c)
// Input base64-encoded byte slice
decrypter := dongle.Decrypt.FromBase64Bytes(base64Bytes).ByBlowfish(c)
// Input base64-encoded file stream
file, _ := os.Open("encrypted.base64")
decrypter := dongle.Decrypt.FromBase64File(file).ByBlowfish(c)

// Input raw string
decrypter := dongle.Decrypt.FromRawString(rawString).ByBlowfish(c)
// Input raw byte slice
decrypter := dongle.Decrypt.FromRawBytes(rawBytes).ByBlowfish(c)
// Input raw file stream
file, _ := os.Open("encrypted.bin")
decrypter := dongle.Decrypt.FromRawFile(file).ByBlowfish(c)

// Check decryption error
if decrypter.Error != nil {
	fmt.Printf("Decryption error: %v\n", decrypter.Error)
	return
}

Output Data

go
// Output decrypted string
decrypter.ToString() // hello world
// Output decrypted byte slice
decrypter.ToBytes()  // []byte("hello world")

CTR Mode ​

Create Cipher ​

go
c := cipher.NewBlowfishCipher(cipher.CTR)
// Set key (1-56 bytes)
c.SetKey([]byte("1234567890123456"))
// Set initialization vector (8 bytes)
c.SetIV([]byte("87654321"))

Encrypt Data ​

Input Data

go
// Input string
encrypter := dongle.Encrypt.FromString("hello world").ByBlowfish(c)
// Input byte slice
encrypter := dongle.Encrypt.FromBytes([]byte("hello world")).ByBlowfish(c)
// Input file stream
file, _ := os.Open("test.txt")
encrypter := dongle.Encrypt.FromFile(file).ByBlowfish(c)

// Check encryption error
if encrypter.Error != nil {
	fmt.Printf("Encryption error: %v\n", encrypter.Error)
	return
}

Output Data

go
// Output hex-encoded string
encrypter.ToHexString() // 7fae94fd1a8b880d8d5454dd8df30c40
// Output hex-encoded byte slice
encrypter.ToHexBytes()   // []byte("7fae94fd1a8b880d8d5454dd8df30c40")

// Output base64-encoded string
encrypter.ToBase64String() // f66U/RqLiA2NVFTdjfMMQA==
// Output base64-encoded byte slice
encrypter.ToBase64Bytes()   // []byte("f66U/RqLiA2NVFTdjfMMQA==")

// Output raw string
encrypter.ToRawString()
// Output raw byte slice
encrypter.ToRawBytes()

Decrypt Data ​

Input Data

go
// Input hex-encoded string
decrypter := dongle.Decrypt.FromHexString(hexString).ByBlowfish(c)
// Input hex-encoded byte slice
decrypter := dongle.Decrypt.FromHexBytes(hexBytes).ByBlowfish(c)
// Input hex-encoded file stream
file, _ := os.Open("encrypted.hex")
decrypter := dongle.Decrypt.FromHexFile(file).ByBlowfish(c)

// Input base64-encoded string
decrypter := dongle.Decrypt.FromBase64String(base64String).ByBlowfish(c)
// Input base64-encoded byte slice
decrypter := dongle.Decrypt.FromBase64Bytes(base64Bytes).ByBlowfish(c)
// Input base64-encoded file stream
file, _ := os.Open("encrypted.base64")
decrypter := dongle.Decrypt.FromBase64File(file).ByBlowfish(c)

// Input raw string
decrypter := dongle.Decrypt.FromRawString(rawString).ByBlowfish(c)
// Input raw byte slice
decrypter := dongle.Decrypt.FromRawBytes(rawBytes).ByBlowfish(c)
// Input raw file stream
file, _ := os.Open("encrypted.bin")
decrypter := dongle.Decrypt.FromRawFile(file).ByBlowfish(c)

// Check decryption error
if decrypter.Error != nil {
	fmt.Printf("Decryption error: %v\n", decrypter.Error)
	return
}

Output Data

go
// Output decrypted string
decrypter.ToString() // hello world
// Output decrypted byte slice
decrypter.ToBytes() // []byte("hello world")

CFB Mode ​

Create Cipher ​

go
c := cipher.NewBlowfishCipher(cipher.CFB)
// Set key (1-56 bytes)
c.SetKey([]byte("1234567890123456"))
// Set initialization vector (8 bytes)
c.SetIV([]byte("87654321"))

Encrypt Data ​

Input Data

go
// Input string
encrypter := dongle.Encrypt.FromString("hello world").ByBlowfish(c)
// Input byte slice
encrypter := dongle.Encrypt.FromBytes([]byte("hello world")).ByBlowfish(c)
// Input file stream
file, _ := os.Open("test.txt")
encrypter := dongle.Encrypt.FromFile(file).ByBlowfish(c)

// Check encryption error
if encrypter.Error != nil {
	fmt.Printf("Encryption error: %v\n", encrypter.Error)
	return
}

Output Data

go
// Output hex-encoded string
encrypter.ToHexString() // 7fae94fd1a8b880d8d5454dd8df30c40
// Output hex-encoded byte slice
encrypter.ToHexBytes()   // []byte("7fae94fd1a8b880d8d5454dd8df30c40")

// Output base64-encoded string
encrypter.ToBase64String() // f66U/RqLiA2NVFTdjfMMQA==
// Output base64-encoded byte slice
encrypter.ToBase64Bytes()   // []byte("f66U/RqLiA2NVFTdjfMMQA==")

// Output raw string
encrypter.ToRawString()
// Output raw byte slice
encrypter.ToRawBytes()

Decrypt Data ​

Input Data

go
// Input hex-encoded string
decrypter := dongle.Decrypt.FromHexString(hexString).ByBlowfish(c)
// Input hex-encoded byte slice
decrypter := dongle.Decrypt.FromHexBytes(hexBytes).ByBlowfish(c)
// Input hex-encoded file stream
file, _ := os.Open("encrypted.hex")
decrypter := dongle.Decrypt.FromHexFile(file).ByBlowfish(c)

// Input base64-encoded string
decrypter := dongle.Decrypt.FromBase64String(base64String).ByBlowfish(c)
// Input base64-encoded byte slice
decrypter := dongle.Decrypt.FromBase64Bytes(base64Bytes).ByBlowfish(c)
// Input base64-encoded file stream
file, _ := os.Open("encrypted.base64")
decrypter := dongle.Decrypt.FromBase64File(file).ByBlowfish(c)

// Input raw string
decrypter := dongle.Decrypt.FromRawString(rawString).ByBlowfish(c)
// Input raw byte slice
decrypter := dongle.Decrypt.FromRawBytes(rawBytes).ByBlowfish(c)
// Input raw file stream
file, _ := os.Open("encrypted.bin")
decrypter := dongle.Decrypt.FromRawFile(file).ByBlowfish(c)

// Check decryption error
if decrypter.Error != nil {
	fmt.Printf("Decryption error: %v\n", decrypter.Error)
	return
}

Output Data

go
// Output decrypted string
decrypter.ToString() // hello world
// Output decrypted byte slice
decrypter.ToBytes()  // []byte("hello world")

OFB Mode ​

Create Cipher ​

go
c := cipher.NewBlowfishCipher(cipher.OFB)
// Set key (1-56 bytes)
c.SetKey([]byte("1234567890123456"))
// Set initialization vector (8 bytes)
c.SetIV([]byte("87654321"))

Encrypt Data ​

Input Data

go
// Input string
encrypter := dongle.Encrypt.FromString("hello world").ByBlowfish(c)
// Input byte slice
encrypter := dongle.Encrypt.FromBytes([]byte("hello world")).ByBlowfish(c)
// Input file stream
file, _ := os.Open("test.txt")
encrypter := dongle.Encrypt.FromFile(file).ByBlowfish(c)

// Check encryption error
if encrypter.Error != nil {
	fmt.Printf("Encryption error: %v\n", encrypter.Error)
	return
}

Output Data

go
// Output hex-encoded string
encrypter.ToHexString() // 7fae94fd1a8b880d8d5454dd8df30c40
// Output hex-encoded byte slice
encrypter.ToHexBytes()   // []byte("7fae94fd1a8b880d8d5454dd8df30c40")

// Output base64-encoded string
encrypter.ToBase64String() // f66U/RqLiA2NVFTdjfMMQA==
// Output base64-encoded byte slice
encrypter.ToBase64Bytes()   // []byte("f66U/RqLiA2NVFTdjfMMQA==")

// Output raw string
encrypter.ToRawString()
// Output raw byte slice
encrypter.ToRawBytes()

Decrypt Data ​

Input Data

go
// Input hex-encoded string
decrypter := dongle.Decrypt.FromHexString(hexString).ByBlowfish(c)
// Input hex-encoded byte slice
decrypter := dongle.Decrypt.FromHexBytes(hexBytes).ByBlowfish(c)
// Input hex-encoded file stream
file, _ := os.Open("encrypted.hex")
decrypter := dongle.Decrypt.FromHexFile(file).ByBlowfish(c)

// Input base64-encoded string
decrypter := dongle.Decrypt.FromBase64String(base64String).ByBlowfish(c)
// Input base64-encoded byte slice
decrypter := dongle.Decrypt.FromBase64Bytes(base64Bytes).ByBlowfish(c)
// Input base64-encoded file stream
file, _ := os.Open("encrypted.base64")
decrypter := dongle.Decrypt.FromBase64File(file).ByBlowfish(c)

// Input raw string
decrypter := dongle.Decrypt.FromRawString(rawString).ByBlowfish(c)
// Input raw byte slice
decrypter := dongle.Decrypt.FromRawBytes(rawBytes).ByBlowfish(c)
// Input raw file stream
file, _ := os.Open("encrypted.bin")
decrypter := dongle.Decrypt.FromRawFile(file).ByBlowfish(c)

// Check decryption error
if decrypter.Error != nil {
	fmt.Printf("Decryption error: %v\n", decrypter.Error)
	return
}

Output Data

go
// Output decrypted string
decrypter.ToString() // hello world
// Output decrypted byte slice
decrypter.ToBytes()  // []byte("hello world")

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