7.7. Symmetric Encryption¶

Functions:

SymEnc(key []byte, iv []byte, plaintext []byte) ([]byte)¶

Encrypt the plaintext using AES-CTR mode with the provided key and IV.

Returns the ciphertext, which will contain the IV (you do not need to store the IV separately).

This function is capable of encrypting variable-length plaintext, regardless of size. You do NOT need to pad your plaintext to any specific block size.

Parameters

• key ([]byte) – 16-byte symmetric key for encryption

• iv ([]byte) – 16-byte initialization vector

• plaintext ([]byte) – Message to encrypt

Returns

Ciphertext

Return type

[]byte

SymDec(key []byte, ciphertext []byte) ([]byte)¶

Decrypt the ciphertext using the key.

Parameters

• key ([]byte) – 16-byte symmetric key for decryption

• ciphertext ([]byte) – Message to decrypt

Returns

Plaintext

Return type

[]byte