Galois/Counter Mode (GCM) implementation. More...

#include <gcm.h>
#include <aes.h>
#include <memory.h>

Macros
#define	GET_UINT32_BE(n, b, i)

#define	PUT_UINT32_BE(n, b, i)

Functions
	MODULE ("turnstone.lib.crypto")

int32_t	gcm_initialize (void)

static void	gcm_mult (gcm_context_t *ctx, const uint8_t x[16], uint8_t output[16])

int32_t	gcm_setkey (gcm_context_t ctx, const uint8_t key, const uint32_t keysize)

int32_t	gcm_start (gcm_context_t ctx, int32_t mode, const uint8_t iv, size_t iv_len, const uint8_t *add, size_t add_len)

int32_t	gcm_update (gcm_context_t ctx, size_t length, const uint8_t input, uint8_t *output)

int32_t	gcm_finish (gcm_context_t ctx, uint8_t tag, size_t tag_len)

int32_t	gcm_crypt_and_tag (gcm_context_t ctx, int32_t mode, const uint8_t iv, size_t iv_len, const uint8_t add, size_t add_len, const uint8_t input, uint8_t output, size_t length, uint8_t tag, size_t tag_len)

int32_t	gcm_auth_decrypt (gcm_context_t ctx, const uint8_t iv, size_t iv_len, const uint8_t add, size_t add_len, const uint8_t input, uint8_t output, size_t length, const uint8_t tag, size_t tag_len)

void	gcm_zero_ctx (gcm_context_t *ctx)

Variables
static const uint64_t	gcm_last4 [16]

Detailed Description

Galois/Counter Mode (GCM) implementation.

This work is licensed under TURNSTONE OS Public License. Please read and understand latest version of Licence.

Macro Definition Documentation

◆ GET_UINT32_BE

#define GET_UINT32_BE	(	n,
		b,
		i
	)

Value:

            {                      \
            (n) = ( (uint32_t) (b)[(i)    ] << 24 )         \
                  | ( (uint32_t) (b)[(i) + 1] << 16 )         \
                  | ( (uint32_t) (b)[(i) + 2] <<  8 )         \
                  | ( (uint32_t) (b)[(i) + 3]       ); }

◆ PUT_UINT32_BE

#define PUT_UINT32_BE	(	n,
		b,
		i
	)

Value:

            {                      \
            (b)[(i)    ] = (uint8_t) ( (n) >> 24 );   \
            (b)[(i) + 1] = (uint8_t) ( (n) >> 16 );   \
            (b)[(i) + 2] = (uint8_t) ( (n) >>  8 );   \
            (b)[(i) + 3] = (uint8_t) ( (n)       ); }

Variable Documentation

◆ gcm_last4

const uint64_t gcm_last4[16]

static

Initial value:

= {
    0x0000, 0x1c20, 0x3840, 0x2460, 0x7080, 0x6ca0, 0x48c0, 0x54e0,
    0xe100, 0xfd20, 0xd940, 0xc560, 0x9180, 0x8da0, 0xa9c0, 0xb5e0
}

Macros