This is a C language implementation of AES-256 encryption and decryption in CBC mode.
Data must be padded to 16-byte blocks.
Encrypts data using AES-256 in CBC mode.
Returns 1 on success, 0 on error.
int aes_256_cbc_encrypt(
const uint8_t key[32],
const uint8_t iv[16],
const uint8_t *plaintext,
size_t plaintext_len,
uint8_t *ciphertext
);-
key - 32-byte encryption key
-
iv - 16-byte initialization vector
-
plaintext - input data to encrypt (16-byte padded)
-
plaintext_len - length of plaintext in bytes
-
ciphertext - output buffer for encrypted data
Decrypts data using AES-256 in CBC mode.
Returns 1 on success, 0 on error.
int aes_256_cbc_decrypt(
const uint8_t key[32],
const uint8_t iv[16],
const uint8_t *ciphertext,
size_t ciphertext_len,
uint8_t *plaintext
);-
key - 32-byte encryption key
-
iv - 16-byte initialization vector
-
ciphertext - encrypted data to decrypt (16-byte blocks)
-
ciphertext_len - length of ciphertext in bytes
-
plaintext - output buffer for decrypted data
© 2025 Nuran Askarov
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