ccm.c File Reference

#include "mbedtls/config.h"
#include "mbedtls/ccm.h"
#include <string.h>
#include "mbedtls/platform.h"
#include "arc4_alt.h"

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Macros
#define	CCM_ENCRYPT   0
#define	CCM_DECRYPT   1
#define	UPDATE_CBC_MAC
#define	CTR_CRYPT(dst, src, len)
#define	NB_TESTS   3

Functions
void	mbedtls_ccm_init (mbedtls_ccm_context *ctx)
	Initialize CCM context (just makes references valid) Makes the context ready for mbedtls_ccm_setkey() or mbedtls_ccm_free(). More...
int	mbedtls_ccm_setkey (mbedtls_ccm_context *ctx, mbedtls_cipher_id_t cipher, const unsigned char *key, unsigned int keybits)
	CCM initialization (encryption and decryption) More...
void	mbedtls_ccm_free (mbedtls_ccm_context *ctx)
	Free a CCM context and underlying cipher sub-context. More...
static int	ccm_auth_crypt (mbedtls_ccm_context *ctx, int mode, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *input, unsigned char *output, unsigned char *tag, size_t tag_len)
int	mbedtls_ccm_encrypt_and_tag (mbedtls_ccm_context *ctx, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *input, unsigned char *output, unsigned char *tag, size_t tag_len)
	CCM buffer encryption. More...
int	mbedtls_ccm_auth_decrypt (mbedtls_ccm_context *ctx, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *input, unsigned char *output, const unsigned char *tag, size_t tag_len)
	CCM buffer authenticated decryption. More...
int	mbedtls_ccm_self_test (int verbose)
	Checkup routine. More...

Variables
static const unsigned char	ccm_key []
static const unsigned char	iv []
static const unsigned char	ad []
static const unsigned char	msg []
static const size_t	iv_len [NB_TESTS] = { 7, 8, 12 }
static const size_t	add_len [NB_TESTS] = { 8, 16, 20 }
static const size_t	msg_len [NB_TESTS] = { 4, 16, 24 }
static const size_t	tag_len [NB_TESTS] = { 4, 6, 8 }
static const unsigned char	res [NB_TESTS][32]

Macro Definition Documentation

CCM_DECRYPT

#define CCM_DECRYPT   1

CCM_ENCRYPT

#define CCM_ENCRYPT   0

CTR_CRYPT

#define CTR_CRYPT	(		dst,
			src,
			len
	)

Value:

if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, 16, b, &olen ) ) != 0 )  \
        return( ret );                                                         \
                                                                               \
    for( i = 0; i < len; i++ )                                                 \
        dst[i] = src[i] ^ b[i];

NB_TESTS

#define NB_TESTS   3

UPDATE_CBC_MAC

#define UPDATE_CBC_MAC

Value:

for( i = 0; i < 16; i++ )                                               \
        y[i] ^= b[i];                                                       \
                                                                            \
    if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, y, 16, y, &olen ) ) != 0 ) \
        return( ret );

Function Documentation

ccm_auth_crypt()

static int ccm_auth_crypt ( mbedtls_ccm_context *  ctx, int  mode, size_t  length, const unsigned char *  iv, size_t  iv_len, const unsigned char *  add, size_t  add_len, const unsigned char *  input, unsigned char *  output, unsigned char *  tag, size_t  tag_len  )

static

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mbedtls_ccm_auth_decrypt()

int mbedtls_ccm_auth_decrypt	(	mbedtls_ccm_context *	ctx,
		size_t	length,
		const unsigned char *	iv,
		size_t	iv_len,
		const unsigned char *	add,
		size_t	add_len,
		const unsigned char *	input,
		unsigned char *	output,
		const unsigned char *	tag,
		size_t	tag_len
	)

CCM buffer authenticated decryption.

Parameters

ctx	CCM context
length	length of the input data
iv	initialization vector
iv_len	length of IV
add	additional data
add_len	length of additional data
input	buffer holding the input data
output	buffer for holding the output data
tag	buffer holding the tag
tag_len	length of the tag

Returns

0 if successful and authenticated, MBEDTLS_ERR_CCM_AUTH_FAILED if tag does not match

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mbedtls_ccm_encrypt_and_tag()

int mbedtls_ccm_encrypt_and_tag	(	mbedtls_ccm_context *	ctx,
		size_t	length,
		const unsigned char *	iv,
		size_t	iv_len,
		const unsigned char *	add,
		size_t	add_len,
		const unsigned char *	input,
		unsigned char *	output,
		unsigned char *	tag,
		size_t	tag_len
	)

CCM buffer encryption.

Parameters

ctx	CCM context
length	length of the input data in bytes
iv	nonce (initialization vector)
iv_len	length of IV in bytes must be 2, 3, 4, 5, 6, 7 or 8
add	additional data
add_len	length of additional data in bytes must be less than 2^16 - 2^8
input	buffer holding the input data
output	buffer for holding the output data must be at least 'length' bytes wide
tag	buffer for holding the tag
tag_len	length of the tag to generate in bytes must be 4, 6, 8, 10, 14 or 16

Note

The tag is written to a separate buffer. To get the tag concatenated with the output as in the CCM spec, use tag = output + length and make sure the output buffer is at least length + tag_len wide.

Returns

0 if successful

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mbedtls_ccm_free()

void mbedtls_ccm_free

(

mbedtls_ccm_context *

ctx

)

Free a CCM context and underlying cipher sub-context.

Parameters

ctx	CCM context to free

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mbedtls_ccm_init()

void mbedtls_ccm_init

(

mbedtls_ccm_context *

ctx

)

Initialize CCM context (just makes references valid) Makes the context ready for mbedtls_ccm_setkey() or mbedtls_ccm_free().

Parameters

ctx	CCM context to initialize

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mbedtls_ccm_self_test()

int mbedtls_ccm_self_test

(

int

verbose

)

Checkup routine.

Returns

0 if successful, or 1 if the test failed

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mbedtls_ccm_setkey()

int mbedtls_ccm_setkey	(	mbedtls_ccm_context *	ctx,
		mbedtls_cipher_id_t	cipher,
		const unsigned char *	key,
		unsigned int	keybits
	)

CCM initialization (encryption and decryption)

Parameters

ctx	CCM context to be initialized
cipher	cipher to use (a 128-bit block cipher)
key	encryption key
keybits	key size in bits (must be acceptable by the cipher)

Returns

0 if successful, or a cipher specific error code

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Variable Documentation

ad

const unsigned char ad[]

static

Initial value:

= {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
    0x10, 0x11, 0x12, 0x13
}

add_len

const size_t add_len[NB_TESTS] = { 8, 16, 20 }

static

ccm_key

const unsigned char ccm_key[]

static

Initial value:

= {
    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
    0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
}

iv

const unsigned char iv[]

static

Initial value:

= {
    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
    0x18, 0x19, 0x1a, 0x1b
}

iv_len

const size_t iv_len[NB_TESTS] = { 7, 8, 12 }

static

msg

const unsigned char msg[]

static

Initial value:

= {
    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
    0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
}

msg_len

const size_t msg_len[NB_TESTS] = { 4, 16, 24 }

static

res

const unsigned char res[NB_TESTS][32]

static

Initial value:

= {
    {   0x71, 0x62, 0x01, 0x5b, 0x4d, 0xac, 0x25, 0x5d },
    {   0xd2, 0xa1, 0xf0, 0xe0, 0x51, 0xea, 0x5f, 0x62,
        0x08, 0x1a, 0x77, 0x92, 0x07, 0x3d, 0x59, 0x3d,
        0x1f, 0xc6, 0x4f, 0xbf, 0xac, 0xcd },
    {   0xe3, 0xb2, 0x01, 0xa9, 0xf5, 0xb7, 0x1a, 0x7a,
        0x9b, 0x1c, 0xea, 0xec, 0xcd, 0x97, 0xe7, 0x0b,
        0x61, 0x76, 0xaa, 0xd9, 0xa4, 0x42, 0x8a, 0xa5,
        0x48, 0x43, 0x92, 0xfb, 0xc1, 0xb0, 0x99, 0x51 }
}

tag_len

const size_t tag_len[NB_TESTS] = { 4, 6, 8 }

static