File syn_aes128.c¶

FileList > src > syntropic > util > syn_aes128.c

AES-128 implementation (S-Box, Key Expansion, ECB, CBC mode).

#include "syn_aes128.h"
#include "syn_assert.h"
#include <string.h>

Public Static Attributes¶

Type	Name
const uint8_t	rcon = `{0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36}`
const uint8_t	rsbox = `/* multi line expression */`
const uint8_t	sbox = `/* multi line expression */`

Public Functions¶

Type	Name
SYN_Status	syn_aes128_cbc_decrypt (const SYN_AES128_Context * ctx, const uint8_t iv, const uint8_t * in, size_t in_len, uint8_t * out, size_t out_capacity, size_t * out_len) Decrypt data using AES-128-CBC with PKCS#7 padding removal.
SYN_Status	syn_aes128_cbc_encrypt (const SYN_AES128_Context * ctx, const uint8_t iv, const uint8_t * in, size_t in_len, uint8_t * out, size_t out_capacity, size_t * out_len) Encrypt data using AES-128-CBC with PKCS#7 padding.
void	syn_aes128_decrypt_block (const SYN_AES128_Context * ctx, const uint8_t in, uint8_t out) Decrypt a single 16-byte block (ECB mode).
void	syn_aes128_encrypt_block (const SYN_AES128_Context * ctx, const uint8_t in, uint8_t out) Encrypt a single 16-byte block (ECB mode).
SYN_Status	syn_aes128_init (SYN_AES128_Context * ctx, const uint8_t key) Initialize AES-128 context and expand 128-bit key.

Public Static Functions¶

Type	Name
uint8_t	gmult (uint8_t a, uint8_t b)
uint8_t	gmult2 (uint8_t a)

Public Static Attributes Documentation¶

variable rcon¶

const uint8_t rcon[11];

variable rsbox¶

const uint8_t rsbox[256];

variable sbox¶

const uint8_t sbox[256];

Public Functions Documentation¶

function syn_aes128_cbc_decrypt¶

Decrypt data using AES-128-CBC with PKCS#7 padding removal.

SYN_Status syn_aes128_cbc_decrypt (
    const SYN_AES128_Context * ctx,
    const uint8_t iv,
    const uint8_t * in,
    size_t in_len,
    uint8_t * out,
    size_t out_capacity,
    size_t * out_len
)

Parameters:

ctx Initialized AES-128 context.
iv 16-byte initialization vector.
in Ciphertext buffer (multiple of 16 bytes).
in_len Ciphertext length in bytes.
out Plaintext output buffer.
out_capacity Output buffer size.
out_len Decrypted plaintext byte count written.

Returns:

SYN_OK on success, or SYN_INVALID_PARAM on invalid padding.

function syn_aes128_cbc_encrypt¶

Encrypt data using AES-128-CBC with PKCS#7 padding.

SYN_Status syn_aes128_cbc_encrypt (
    const SYN_AES128_Context * ctx,
    const uint8_t iv,
    const uint8_t * in,
    size_t in_len,
    uint8_t * out,
    size_t out_capacity,
    size_t * out_len
)

Parameters:

ctx Initialized AES-128 context.
iv 16-byte initialization vector.
in Plaintext buffer.
in_len Plaintext length in bytes.
out Ciphertext buffer (must be large enough for in_len + PKCS7 padding).
out_capacity Maximum size of output buffer.
out_len Output byte count written.

Returns:

SYN_OK on success.

function syn_aes128_decrypt_block¶

Decrypt a single 16-byte block (ECB mode).

void syn_aes128_decrypt_block (
    const SYN_AES128_Context * ctx,
    const uint8_t in,
    uint8_t out
)

Parameters:

ctx Initialized AES-128 context.
in 16-byte ciphertext block.
out 16-byte plaintext block.

function syn_aes128_encrypt_block¶

Encrypt a single 16-byte block (ECB mode).

void syn_aes128_encrypt_block (
    const SYN_AES128_Context * ctx,
    const uint8_t in,
    uint8_t out
)

Parameters:

ctx Initialized AES-128 context.
in 16-byte plaintext block.
out 16-byte ciphertext block.

function syn_aes128_init¶

Initialize AES-128 context and expand 128-bit key.

SYN_Status syn_aes128_init (
    SYN_AES128_Context * ctx,
    const uint8_t key
)

Parameters:

ctx AES-128 context instance.
key 16-byte key buffer.

Returns:

SYN_OK on success.

Public Static Functions Documentation¶

function gmult¶

static inline uint8_t gmult (
    uint8_t a,
    uint8_t b
)

function gmult2¶

static inline uint8_t gmult2 (
    uint8_t a
)

The documentation for this class was generated from the following file src/syntropic/util/syn_aes128.c