EFMCrypto

File and data encryption/decryption using AES-256 in CBC mode, built on Unreal's own Core AES implementation. Any string works as a key, it gets hashed into a proper 256-bit key internally. A random IV is generated on every call, so encrypting the same data twice never produces the same output.

Note: This is encryption only, there's no integrity check on the encrypted data, so it's meant for save games and local config rather than anything that needs tamper detection.

Functions

EncryptFile

Callable Encrypts a file and saves to a new location.

C++

bool EncryptFile(const FString& SourceFile, const FString& DestinationFile, const FString& Key)

Parameter	Type	Description
SourceFile	FString	Path to the source file
DestinationFile	FString	Path for the encrypted output
Key	FString	Encryption key

Returns: true if encryption succeeded

Category: EFM|Crypto

Blueprint Node

ƒEncrypt File

Source File

Destination File

Key

Return Value

DecryptFile

Callable Decrypts a file and saves to a new location.

C++

bool DecryptFile(const FString& SourceFile, const FString& DestinationFile, const FString& Key)

Category: EFM|Crypto

Blueprint Node

ƒDecrypt File

Source File

Destination File

Key

Return Value

EncryptBytes

Callable Encrypts a byte array.

C++

TArray<uint8> EncryptBytes(const TArray<uint8>& Data, const FString& Key)

Category: EFM|Crypto

Blueprint Node

ƒEncrypt Bytes

Data

Key

Return Value

DecryptBytes

Callable Decrypts a byte array.

C++

TArray<uint8> DecryptBytes(const TArray<uint8>& Data, const FString& Key)

Category: EFM|Crypto

Blueprint Node

ƒDecrypt Bytes

Data

Key

Return Value

EncryptString

Callable Encrypts a string.

C++

bool EncryptString(const FString& PlainText, const FString& Key, FString& OutEncrypted)

Parameter	Type	Direction	Description
PlainText	FString	In	Text to encrypt
Key	FString	In	Encryption key
OutEncrypted	FString	Out	Encrypted output

Returns: true if encryption succeeded

Category: EFM|Crypto

Blueprint Node

ƒEncrypt String

Plain Text

Key

Out Encrypted

Return Value

DecryptString

Callable Decrypts a string.

C++

bool DecryptString(const FString& EncryptedText, const FString& Key, FString& OutDecrypted)

Category: EFM|Crypto

Blueprint Node

ƒDecrypt String

Encrypted Text

Key

Out Decrypted

Return Value

Example

// Encrypt a save file
EncryptFile(
  GetGameSavedDirectory() + "save.dat",
  GetGameSavedDirectory() + "save.enc",
  "MySecretKey123"
)

// Encrypt a string
Encrypted = ""
EncryptString("SensitiveData", "MySecretKey123", Encrypted)
// Store Encrypted somewhere...

// Decrypt later
Decrypted = ""
DecryptString(Encrypted, "MySecretKey123", Decrypted)
// Decrypted now contains "SensitiveData"