This file contains an abstraction interface for use with the cipher primitives provided by the library. More...

Data Structures
struct	mbedtls_cipher_info_t
	Cipher information. More...
struct	mbedtls_cipher_context_t
	Generic cipher context. More...
Typedefs
typedef struct mbedtls_cipher_base_t	mbedtls_cipher_base_t
	Base cipher information (opaque struct).
typedef struct mbedtls_cmac_context_t	mbedtls_cmac_context_t
	CMAC context (opaque struct).
Enumerations
enum	mbedtls_cipher_id_t { MBEDTLS_CIPHER_ID_NONE = 0, MBEDTLS_CIPHER_ID_NULL, MBEDTLS_CIPHER_ID_AES, MBEDTLS_CIPHER_ID_DES, MBEDTLS_CIPHER_ID_3DES, MBEDTLS_CIPHER_ID_CAMELLIA, MBEDTLS_CIPHER_ID_BLOWFISH, MBEDTLS_CIPHER_ID_ARC4, MBEDTLS_CIPHER_ID_ARIA }
	Supported cipher types. More...
enum	mbedtls_cipher_type_t { MBEDTLS_CIPHER_NONE = 0, MBEDTLS_CIPHER_NULL, MBEDTLS_CIPHER_AES_128_ECB, MBEDTLS_CIPHER_AES_192_ECB, MBEDTLS_CIPHER_AES_256_ECB, MBEDTLS_CIPHER_AES_128_CBC, MBEDTLS_CIPHER_AES_192_CBC, MBEDTLS_CIPHER_AES_256_CBC, MBEDTLS_CIPHER_AES_128_CFB128, MBEDTLS_CIPHER_AES_192_CFB128, MBEDTLS_CIPHER_AES_256_CFB128, MBEDTLS_CIPHER_AES_128_CTR, MBEDTLS_CIPHER_AES_192_CTR, MBEDTLS_CIPHER_AES_256_CTR, MBEDTLS_CIPHER_AES_128_GCM, MBEDTLS_CIPHER_AES_192_GCM, MBEDTLS_CIPHER_AES_256_GCM, MBEDTLS_CIPHER_CAMELLIA_128_ECB, MBEDTLS_CIPHER_CAMELLIA_192_ECB, MBEDTLS_CIPHER_CAMELLIA_256_ECB, MBEDTLS_CIPHER_CAMELLIA_128_CBC, MBEDTLS_CIPHER_CAMELLIA_192_CBC, MBEDTLS_CIPHER_CAMELLIA_256_CBC, MBEDTLS_CIPHER_CAMELLIA_128_CFB128, MBEDTLS_CIPHER_CAMELLIA_192_CFB128, MBEDTLS_CIPHER_CAMELLIA_256_CFB128, MBEDTLS_CIPHER_CAMELLIA_128_CTR, MBEDTLS_CIPHER_CAMELLIA_192_CTR, MBEDTLS_CIPHER_CAMELLIA_256_CTR, MBEDTLS_CIPHER_CAMELLIA_128_GCM, MBEDTLS_CIPHER_CAMELLIA_192_GCM, MBEDTLS_CIPHER_CAMELLIA_256_GCM, MBEDTLS_CIPHER_DES_ECB, MBEDTLS_CIPHER_DES_CBC, MBEDTLS_CIPHER_DES_EDE_ECB, MBEDTLS_CIPHER_DES_EDE_CBC, MBEDTLS_CIPHER_DES_EDE3_ECB, MBEDTLS_CIPHER_DES_EDE3_CBC, MBEDTLS_CIPHER_BLOWFISH_ECB, MBEDTLS_CIPHER_BLOWFISH_CBC, MBEDTLS_CIPHER_BLOWFISH_CFB64, MBEDTLS_CIPHER_BLOWFISH_CTR, MBEDTLS_CIPHER_ARC4_128, MBEDTLS_CIPHER_AES_128_CCM, MBEDTLS_CIPHER_AES_192_CCM, MBEDTLS_CIPHER_AES_256_CCM, MBEDTLS_CIPHER_CAMELLIA_128_CCM, MBEDTLS_CIPHER_CAMELLIA_192_CCM, MBEDTLS_CIPHER_CAMELLIA_256_CCM, MBEDTLS_CIPHER_ARIA_128_ECB, MBEDTLS_CIPHER_ARIA_192_ECB, MBEDTLS_CIPHER_ARIA_256_ECB, MBEDTLS_CIPHER_ARIA_128_CBC, MBEDTLS_CIPHER_ARIA_192_CBC, MBEDTLS_CIPHER_ARIA_256_CBC, MBEDTLS_CIPHER_ARIA_128_CFB128, MBEDTLS_CIPHER_ARIA_192_CFB128, MBEDTLS_CIPHER_ARIA_256_CFB128, MBEDTLS_CIPHER_ARIA_128_CTR, MBEDTLS_CIPHER_ARIA_192_CTR, MBEDTLS_CIPHER_ARIA_256_CTR, MBEDTLS_CIPHER_ARIA_128_GCM, MBEDTLS_CIPHER_ARIA_192_GCM, MBEDTLS_CIPHER_ARIA_256_GCM, MBEDTLS_CIPHER_ARIA_128_CCM, MBEDTLS_CIPHER_ARIA_192_CCM, MBEDTLS_CIPHER_ARIA_256_CCM }
	Supported {cipher type, cipher mode} pairs. More...
enum	mbedtls_cipher_mode_t { MBEDTLS_MODE_NONE = 0, MBEDTLS_MODE_ECB, MBEDTLS_MODE_CBC, MBEDTLS_MODE_CFB, MBEDTLS_MODE_OFB, MBEDTLS_MODE_CTR, MBEDTLS_MODE_GCM, MBEDTLS_MODE_STREAM, MBEDTLS_MODE_CCM }
	Supported cipher modes. More...
enum	mbedtls_cipher_padding_t { MBEDTLS_PADDING_PKCS7 = 0, MBEDTLS_PADDING_ONE_AND_ZEROS, MBEDTLS_PADDING_ZEROS_AND_LEN, MBEDTLS_PADDING_ZEROS, MBEDTLS_PADDING_NONE }
	Supported cipher padding types. More...
enum	mbedtls_operation_t
	Type of operation. More...
enum	{ MBEDTLS_KEY_LENGTH_NONE = 0, MBEDTLS_KEY_LENGTH_DES = 64, MBEDTLS_KEY_LENGTH_DES_EDE = 128, MBEDTLS_KEY_LENGTH_DES_EDE3 = 192 }
Functions
const int *	mbedtls_cipher_list (void)
	This function retrieves the list of ciphers supported by the generic cipher module.
const mbedtls_cipher_info_t *	mbedtls_cipher_info_from_string (const char *cipher_name)
	This function retrieves the cipher-information structure associated with the given cipher name.
const mbedtls_cipher_info_t *	mbedtls_cipher_info_from_type (const mbedtls_cipher_type_t cipher_type)
	This function retrieves the cipher-information structure associated with the given cipher type.
const mbedtls_cipher_info_t *	mbedtls_cipher_info_from_values (const mbedtls_cipher_id_t cipher_id, int key_bitlen, const mbedtls_cipher_mode_t mode)
	This function retrieves the cipher-information structure associated with the given cipher ID, key size and mode.
void	mbedtls_cipher_init (mbedtls_cipher_context_t *ctx)
	This function initializes a `cipher_context` as NONE.
void	mbedtls_cipher_free (mbedtls_cipher_context_t *ctx)
	This function frees and clears the cipher-specific context of `ctx`.
int	mbedtls_cipher_setup (mbedtls_cipher_context_t ctx, const mbedtls_cipher_info_t cipher_info)
	This function initializes and fills the cipher-context structure with the appropriate values.
static unsigned int	mbedtls_cipher_get_block_size (const mbedtls_cipher_context_t *ctx)
	This function returns the block size of the given cipher.
static mbedtls_cipher_mode_t	mbedtls_cipher_get_cipher_mode (const mbedtls_cipher_context_t *ctx)
	This function returns the mode of operation for the cipher.
static int	mbedtls_cipher_get_iv_size (const mbedtls_cipher_context_t *ctx)
	This function returns the size of the IV or nonce of the cipher, in Bytes.
static mbedtls_cipher_type_t	mbedtls_cipher_get_type (const mbedtls_cipher_context_t *ctx)
	This function returns the type of the given cipher.
static const char *	mbedtls_cipher_get_name (const mbedtls_cipher_context_t *ctx)
	This function returns the name of the given cipher as a string.
static int	mbedtls_cipher_get_key_bitlen (const mbedtls_cipher_context_t *ctx)
	This function returns the key length of the cipher.
static mbedtls_operation_t	mbedtls_cipher_get_operation (const mbedtls_cipher_context_t *ctx)
	This function returns the operation of the given cipher.
int	mbedtls_cipher_setkey (mbedtls_cipher_context_t ctx, const unsigned char key, int key_bitlen, const mbedtls_operation_t operation)
	This function sets the key to use with the given context.
int	mbedtls_cipher_set_padding_mode (mbedtls_cipher_context_t *ctx, mbedtls_cipher_padding_t mode)
	This function sets the padding mode, for cipher modes that use padding.
int	mbedtls_cipher_set_iv (mbedtls_cipher_context_t ctx, const unsigned char iv, size_t iv_len)
	This function sets the initialization vector (IV) or nonce.
int	mbedtls_cipher_reset (mbedtls_cipher_context_t *ctx)
	This function resets the cipher state.
int	mbedtls_cipher_update_ad (mbedtls_cipher_context_t ctx, const unsigned char ad, size_t ad_len)
	This function adds additional data for AEAD ciphers.
int	mbedtls_cipher_update (mbedtls_cipher_context_t ctx, const unsigned char input, size_t ilen, unsigned char output, size_t olen)
	The generic cipher update function.
int	mbedtls_cipher_finish (mbedtls_cipher_context_t ctx, unsigned char output, size_t *olen)
	The generic cipher finalization function.
int	mbedtls_cipher_write_tag (mbedtls_cipher_context_t ctx, unsigned char tag, size_t tag_len)
	This function writes a tag for AEAD ciphers.
int	mbedtls_cipher_check_tag (mbedtls_cipher_context_t ctx, const unsigned char tag, size_t tag_len)
	This function checks the tag for AEAD ciphers.
int	mbedtls_cipher_crypt (mbedtls_cipher_context_t ctx, const unsigned char iv, size_t iv_len, const unsigned char input, size_t ilen, unsigned char output, size_t *olen)
	The generic all-in-one encryption/decryption function, for all ciphers except AEAD constructs.
int	mbedtls_cipher_auth_encrypt (mbedtls_cipher_context_t ctx, const unsigned char iv, size_t iv_len, const unsigned char ad, size_t ad_len, const unsigned char input, size_t ilen, unsigned char output, size_t olen, unsigned char *tag, size_t tag_len)
	The generic autenticated encryption (AEAD) function.
int	mbedtls_cipher_auth_decrypt (mbedtls_cipher_context_t ctx, const unsigned char iv, size_t iv_len, const unsigned char ad, size_t ad_len, const unsigned char input, size_t ilen, unsigned char output, size_t olen, const unsigned char *tag, size_t tag_len)
	The generic autenticated decryption (AEAD) function.

Detailed Description

This file contains an abstraction interface for use with the cipher primitives provided by the library.

It provides a common interface to all of the available cipher operations.

Author:: Adriaan de Jong <dejong@fox-it.com>

Definition in file cipher.h.

Typedef Documentation

typedef struct mbedtls_cipher_base_t mbedtls_cipher_base_t

Base cipher information (opaque struct).

Definition at line 217 of file cipher.h.

typedef struct mbedtls_cmac_context_t mbedtls_cmac_context_t

CMAC context (opaque struct).

Definition at line 222 of file cipher.h.

Enumeration Type Documentation

anonymous enum

Enumerator:

MBEDTLS_KEY_LENGTH_NONE	Undefined key length.
MBEDTLS_KEY_LENGTH_DES	Key length, in bits (including parity), for DES keys.
MBEDTLS_KEY_LENGTH_DES_EDE	Key length in bits, including parity, for DES in two-key EDE.
MBEDTLS_KEY_LENGTH_DES_EDE3	Key length in bits, including parity, for DES in three-key EDE.

Definition at line 198 of file cipher.h.

enum mbedtls_cipher_id_t

Supported cipher types.

Warning:: RC4 and DES are considered weak ciphers and their use constitutes a security risk. Arm recommends considering stronger ciphers instead.

Enumerator:

MBEDTLS_CIPHER_ID_NONE	Placeholder to mark the end of cipher ID lists.
MBEDTLS_CIPHER_ID_NULL	The identity cipher, treated as a stream cipher.
MBEDTLS_CIPHER_ID_AES	The AES cipher.
MBEDTLS_CIPHER_ID_DES	The DES cipher.
MBEDTLS_CIPHER_ID_3DES	The Triple DES cipher.
MBEDTLS_CIPHER_ID_CAMELLIA	The Camellia cipher.
MBEDTLS_CIPHER_ID_BLOWFISH	The Blowfish cipher.
MBEDTLS_CIPHER_ID_ARC4	The RC4 cipher.
MBEDTLS_CIPHER_ID_ARIA	The Aria cipher.

Definition at line 80 of file cipher.h.

enum mbedtls_cipher_mode_t

Supported cipher modes.

Enumerator:

MBEDTLS_MODE_NONE	None.
MBEDTLS_MODE_ECB	The ECB cipher mode.
MBEDTLS_MODE_CBC	The CBC cipher mode.
MBEDTLS_MODE_CFB	The CFB cipher mode.
MBEDTLS_MODE_OFB	The OFB cipher mode - unsupported.
MBEDTLS_MODE_CTR	The CTR cipher mode.
MBEDTLS_MODE_GCM	The GCM cipher mode.
MBEDTLS_MODE_STREAM	The stream cipher mode.
MBEDTLS_MODE_CCM	The CCM cipher mode.

Definition at line 170 of file cipher.h.

enum mbedtls_cipher_padding_t

Supported cipher padding types.

Enumerator:

MBEDTLS_PADDING_PKCS7	PKCS7 padding (default).
MBEDTLS_PADDING_ONE_AND_ZEROS	ISO/IEC 7816-4 padding.
MBEDTLS_PADDING_ZEROS_AND_LEN	ANSI X.923 padding.
MBEDTLS_PADDING_ZEROS	Zero padding (not reversible).
MBEDTLS_PADDING_NONE	Never pad (full blocks only).

Definition at line 183 of file cipher.h.

enum mbedtls_cipher_type_t

Supported {cipher type, cipher mode} pairs.

Warning:: RC4 and DES are considered weak ciphers and their use constitutes a security risk. Arm recommends considering stronger ciphers instead.

Enumerator:

MBEDTLS_CIPHER_NONE	Placeholder to mark the end of cipher-pair lists.
MBEDTLS_CIPHER_NULL	The identity stream cipher.
MBEDTLS_CIPHER_AES_128_ECB	AES cipher with 128-bit ECB mode.
MBEDTLS_CIPHER_AES_192_ECB	AES cipher with 192-bit ECB mode.
MBEDTLS_CIPHER_AES_256_ECB	AES cipher with 256-bit ECB mode.
MBEDTLS_CIPHER_AES_128_CBC	AES cipher with 128-bit CBC mode.
MBEDTLS_CIPHER_AES_192_CBC	AES cipher with 192-bit CBC mode.
MBEDTLS_CIPHER_AES_256_CBC	AES cipher with 256-bit CBC mode.
MBEDTLS_CIPHER_AES_128_CFB128	AES cipher with 128-bit CFB128 mode.
MBEDTLS_CIPHER_AES_192_CFB128	AES cipher with 192-bit CFB128 mode.
MBEDTLS_CIPHER_AES_256_CFB128	AES cipher with 256-bit CFB128 mode.
MBEDTLS_CIPHER_AES_128_CTR	AES cipher with 128-bit CTR mode.
MBEDTLS_CIPHER_AES_192_CTR	AES cipher with 192-bit CTR mode.
MBEDTLS_CIPHER_AES_256_CTR	AES cipher with 256-bit CTR mode.
MBEDTLS_CIPHER_AES_128_GCM	AES cipher with 128-bit GCM mode.
MBEDTLS_CIPHER_AES_192_GCM	AES cipher with 192-bit GCM mode.
MBEDTLS_CIPHER_AES_256_GCM	AES cipher with 256-bit GCM mode.
MBEDTLS_CIPHER_CAMELLIA_128_ECB	Camellia cipher with 128-bit ECB mode.
MBEDTLS_CIPHER_CAMELLIA_192_ECB	Camellia cipher with 192-bit ECB mode.
MBEDTLS_CIPHER_CAMELLIA_256_ECB	Camellia cipher with 256-bit ECB mode.
MBEDTLS_CIPHER_CAMELLIA_128_CBC	Camellia cipher with 128-bit CBC mode.
MBEDTLS_CIPHER_CAMELLIA_192_CBC	Camellia cipher with 192-bit CBC mode.
MBEDTLS_CIPHER_CAMELLIA_256_CBC	Camellia cipher with 256-bit CBC mode.
MBEDTLS_CIPHER_CAMELLIA_128_CFB128	Camellia cipher with 128-bit CFB128 mode.
MBEDTLS_CIPHER_CAMELLIA_192_CFB128	Camellia cipher with 192-bit CFB128 mode.
MBEDTLS_CIPHER_CAMELLIA_256_CFB128	Camellia cipher with 256-bit CFB128 mode.
MBEDTLS_CIPHER_CAMELLIA_128_CTR	Camellia cipher with 128-bit CTR mode.
MBEDTLS_CIPHER_CAMELLIA_192_CTR	Camellia cipher with 192-bit CTR mode.
MBEDTLS_CIPHER_CAMELLIA_256_CTR	Camellia cipher with 256-bit CTR mode.
MBEDTLS_CIPHER_CAMELLIA_128_GCM	Camellia cipher with 128-bit GCM mode.
MBEDTLS_CIPHER_CAMELLIA_192_GCM	Camellia cipher with 192-bit GCM mode.
MBEDTLS_CIPHER_CAMELLIA_256_GCM	Camellia cipher with 256-bit GCM mode.
MBEDTLS_CIPHER_DES_ECB	DES cipher with ECB mode.
MBEDTLS_CIPHER_DES_CBC	DES cipher with CBC mode.
MBEDTLS_CIPHER_DES_EDE_ECB	DES cipher with EDE ECB mode.
MBEDTLS_CIPHER_DES_EDE_CBC	DES cipher with EDE CBC mode.
MBEDTLS_CIPHER_DES_EDE3_ECB	DES cipher with EDE3 ECB mode.
MBEDTLS_CIPHER_DES_EDE3_CBC	DES cipher with EDE3 CBC mode.
MBEDTLS_CIPHER_BLOWFISH_ECB	Blowfish cipher with ECB mode.
MBEDTLS_CIPHER_BLOWFISH_CBC	Blowfish cipher with CBC mode.
MBEDTLS_CIPHER_BLOWFISH_CFB64	Blowfish cipher with CFB64 mode.
MBEDTLS_CIPHER_BLOWFISH_CTR	Blowfish cipher with CTR mode.
MBEDTLS_CIPHER_ARC4_128	RC4 cipher with 128-bit mode.
MBEDTLS_CIPHER_AES_128_CCM	AES cipher with 128-bit CCM mode.
MBEDTLS_CIPHER_AES_192_CCM	AES cipher with 192-bit CCM mode.
MBEDTLS_CIPHER_AES_256_CCM	AES cipher with 256-bit CCM mode.
MBEDTLS_CIPHER_CAMELLIA_128_CCM	Camellia cipher with 128-bit CCM mode.
MBEDTLS_CIPHER_CAMELLIA_192_CCM	Camellia cipher with 192-bit CCM mode.
MBEDTLS_CIPHER_CAMELLIA_256_CCM	Camellia cipher with 256-bit CCM mode.
MBEDTLS_CIPHER_ARIA_128_ECB	Aria cipher with 128-bit key and ECB mode.
MBEDTLS_CIPHER_ARIA_192_ECB	Aria cipher with 192-bit key and ECB mode.
MBEDTLS_CIPHER_ARIA_256_ECB	Aria cipher with 256-bit key and ECB mode.
MBEDTLS_CIPHER_ARIA_128_CBC	Aria cipher with 128-bit key and CBC mode.
MBEDTLS_CIPHER_ARIA_192_CBC	Aria cipher with 192-bit key and CBC mode.
MBEDTLS_CIPHER_ARIA_256_CBC	Aria cipher with 256-bit key and CBC mode.
MBEDTLS_CIPHER_ARIA_128_CFB128	Aria cipher with 128-bit key and CFB-128 mode.
MBEDTLS_CIPHER_ARIA_192_CFB128	Aria cipher with 192-bit key and CFB-128 mode.
MBEDTLS_CIPHER_ARIA_256_CFB128	Aria cipher with 256-bit key and CFB-128 mode.
MBEDTLS_CIPHER_ARIA_128_CTR	Aria cipher with 128-bit key and CTR mode.
MBEDTLS_CIPHER_ARIA_192_CTR	Aria cipher with 192-bit key and CTR mode.
MBEDTLS_CIPHER_ARIA_256_CTR	Aria cipher with 256-bit key and CTR mode.
MBEDTLS_CIPHER_ARIA_128_GCM	Aria cipher with 128-bit key and GCM mode.
MBEDTLS_CIPHER_ARIA_192_GCM	Aria cipher with 192-bit key and GCM mode.
MBEDTLS_CIPHER_ARIA_256_GCM	Aria cipher with 256-bit key and GCM mode.
MBEDTLS_CIPHER_ARIA_128_CCM	Aria cipher with 128-bit key and CCM mode.
MBEDTLS_CIPHER_ARIA_192_CCM	Aria cipher with 192-bit key and CCM mode.
MBEDTLS_CIPHER_ARIA_256_CCM	Aria cipher with 256-bit key and CCM mode.

Definition at line 99 of file cipher.h.

enum mbedtls_operation_t

Type of operation.

Definition at line 192 of file cipher.h.

Function Documentation

int mbedtls_cipher_auth_decrypt	(	mbedtls_cipher_context_t *	ctx,
		const unsigned char *	iv,
		size_t	iv_len,
		const unsigned char *	ad,
		size_t	ad_len,
		const unsigned char *	input,
		size_t	ilen,
		unsigned char *	output,
		size_t *	olen,
		const unsigned char *	tag,
		size_t	tag_len
	)

The generic autenticated decryption (AEAD) function.

Note:: If the data is not authentic, then the output buffer is zeroed out to prevent the unauthentic plaintext being used, making this interface safer.

Parameters:

ctx	The generic cipher context.
iv	The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
iv_len	The IV length for ciphers with variable-size IV. This parameter is discarded by ciphers with fixed-size IV.
ad	The additional data to be authenticated.
ad_len	The length of `ad`.
input	The buffer holding the input data.
ilen	The length of the input data.
output	The buffer for the output data. Must be able to hold at least `ilen`.
olen	The length of the output data, to be updated with the actual number of Bytes written.
tag	The buffer holding the authentication tag.
tag_len	The length of the authentication tag.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.; MBEDTLS_ERR_CIPHER_AUTH_FAILED if data is not authentic.; A cipher-specific error code on failure.

Definition at line 880 of file cipher.c.

int mbedtls_cipher_auth_encrypt	(	mbedtls_cipher_context_t *	ctx,
		const unsigned char *	iv,
		size_t	iv_len,
		const unsigned char *	ad,
		size_t	ad_len,
		const unsigned char *	input,
		size_t	ilen,
		unsigned char *	output,
		size_t *	olen,
		unsigned char *	tag,
		size_t	tag_len
	)

The generic autenticated encryption (AEAD) function.

Parameters:

ctx	The generic cipher context.
iv	The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
iv_len	The IV length for ciphers with variable-size IV. This parameter is discarded by ciphers with fixed-size IV.
ad	The additional data to authenticate.
ad_len	The length of `ad`.
input	The buffer holding the input data.
ilen	The length of the input data.
output	The buffer for the output data. Must be able to hold at least `ilen`.
olen	The length of the output data, to be updated with the actual number of Bytes written.
tag	The buffer for the authentication tag.
tag_len	The desired length of the authentication tag.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.; A cipher-specific error code on failure.

Definition at line 848 of file cipher.c.

int mbedtls_cipher_check_tag	(	mbedtls_cipher_context_t *	ctx,
		const unsigned char *	tag,
		size_t	tag_len
	)

This function checks the tag for AEAD ciphers.

Only supported with GCM. Must be called after mbedtls_cipher_finish().

Parameters:

ctx	The generic cipher context.
tag	The buffer holding the tag.
tag_len	The length of the tag to check.

Returns:: 0 on success.; A specific error code on failure.

Definition at line 776 of file cipher.c.

int mbedtls_cipher_crypt	(	mbedtls_cipher_context_t *	ctx,
		const unsigned char *	iv,
		size_t	iv_len,
		const unsigned char *	input,
		size_t	ilen,
		unsigned char *	output,
		size_t *	olen
	)

The generic all-in-one encryption/decryption function, for all ciphers except AEAD constructs.

Parameters:

ctx	The generic cipher context.
iv	The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
iv_len	The IV length for ciphers with variable-size IV. This parameter is discarded by ciphers with fixed-size IV.
input	The buffer holding the input data.
ilen	The length of the input data.
output	The buffer for the output data. Must be able to hold at least `ilen` + block_size. Must not be the same buffer as input.
olen	The length of the output data, to be updated with the actual number of Bytes written.

Note:: Some ciphers do not use IVs nor nonce. For these ciphers, use iv = NULL and iv_len = 0.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.; MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED on decryption expecting a full block but not receiving one.; MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding while decrypting.; A cipher-specific error code on failure.

Definition at line 819 of file cipher.c.

int mbedtls_cipher_finish	(	mbedtls_cipher_context_t *	ctx,
		unsigned char *	output,
		size_t *	olen
	)

The generic cipher finalization function.

If data still needs to be flushed from an incomplete block, the data contained in it is padded to the size of the last block, and written to the output buffer.

Parameters:

ctx	The generic cipher context.
output	The buffer to write data to. Needs block_size available.
olen	The length of the data written to the `output` buffer.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.; MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED on decryption expecting a full block but not receiving one.; MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding while decrypting.; A cipher-specific error code on failure.

Definition at line 633 of file cipher.c.

void mbedtls_cipher_free ( mbedtls_cipher_context_t * ctx )

This function frees and clears the cipher-specific context of ctx.

Freeing ctx itself remains the responsibility of the caller.

Definition at line 132 of file cipher.c.

static unsigned int mbedtls_cipher_get_block_size ( const mbedtls_cipher_context_t * ctx ) [static]

This function returns the block size of the given cipher.

Parameters:

ctx	The context of the cipher. Must be initialized.

Returns:: The size of the blocks of the cipher.; 0 if ctx has not been initialized.

Definition at line 402 of file cipher.h.

static mbedtls_cipher_mode_t mbedtls_cipher_get_cipher_mode ( const mbedtls_cipher_context_t * ctx ) [static]

This function returns the mode of operation for the cipher.

For example, MBEDTLS_MODE_CBC.

Parameters:

ctx	The context of the cipher. Must be initialized.

Returns:: The mode of operation.; MBEDTLS_MODE_NONE if ctx has not been initialized.

Definition at line 419 of file cipher.h.

static int mbedtls_cipher_get_iv_size ( const mbedtls_cipher_context_t * ctx ) [static]

This function returns the size of the IV or nonce of the cipher, in Bytes.

Parameters:

ctx	The context of the cipher. Must be initialized.

Returns:: The recommended IV size if no IV has been set.; 0 for ciphers not using an IV or a nonce.; The actual size if an IV has been set.

Definition at line 437 of file cipher.h.

static int mbedtls_cipher_get_key_bitlen ( const mbedtls_cipher_context_t * ctx ) [static]

This function returns the key length of the cipher.

Parameters:

ctx	The context of the cipher. Must be initialized.

Returns:: The key length of the cipher in bits.; MBEDTLS_KEY_LENGTH_NONE if ctx has not been initialized.

Definition at line 490 of file cipher.h.

static const char* mbedtls_cipher_get_name ( const mbedtls_cipher_context_t * ctx ) [static]

This function returns the name of the given cipher as a string.

Parameters:

ctx	The context of the cipher. Must be initialized.

Returns:: The name of the cipher.; NULL if ctx has not been not initialized.

Definition at line 473 of file cipher.h.

static mbedtls_operation_t mbedtls_cipher_get_operation ( const mbedtls_cipher_context_t * ctx ) [static]

This function returns the operation of the given cipher.

Parameters:

ctx	The context of the cipher. Must be initialized.

Returns:: The type of operation: MBEDTLS_ENCRYPT or MBEDTLS_DECRYPT.; MBEDTLS_OPERATION_NONE if ctx has not been initialized.

Definition at line 506 of file cipher.h.

static mbedtls_cipher_type_t mbedtls_cipher_get_type ( const mbedtls_cipher_context_t * ctx ) [static]

This function returns the type of the given cipher.

Parameters:

ctx	The context of the cipher. Must be initialized.

Returns:: The type of the cipher.; MBEDTLS_CIPHER_NONE if ctx has not been initialized.

Definition at line 456 of file cipher.h.

const mbedtls_cipher_info_t* mbedtls_cipher_info_from_string ( const char * cipher_name )

This function retrieves the cipher-information structure associated with the given cipher name.

Parameters:

cipher_name Name of the cipher to search for.

Returns:: The cipher information structure associated with the given cipher_name.; NULL if the associated cipher information is not found.

Definition at line 98 of file cipher.c.

const mbedtls_cipher_info_t* mbedtls_cipher_info_from_type ( const mbedtls_cipher_type_t cipher_type )

This function retrieves the cipher-information structure associated with the given cipher type.

Parameters:

cipher_type Type of the cipher to search for.

Returns:: The cipher information structure associated with the given cipher_type.; NULL if the associated cipher information is not found.

Definition at line 87 of file cipher.c.

const mbedtls_cipher_info_t* mbedtls_cipher_info_from_values	(	const mbedtls_cipher_id_t	cipher_id,
		int	key_bitlen,
		const mbedtls_cipher_mode_t	mode
	)

This function retrieves the cipher-information structure associated with the given cipher ID, key size and mode.

Parameters:

cipher_id	The ID of the cipher to search for. For example, MBEDTLS_CIPHER_ID_AES.
key_bitlen	The length of the key in bits.
mode	The cipher mode. For example, MBEDTLS_MODE_CBC.

Returns:: The cipher information structure associated with the given cipher_id.; NULL if the associated cipher information is not found.

Definition at line 112 of file cipher.c.

void mbedtls_cipher_init ( mbedtls_cipher_context_t * ctx )

This function initializes a cipher_context as NONE.

Definition at line 127 of file cipher.c.

const int* mbedtls_cipher_list ( void )

This function retrieves the list of ciphers supported by the generic cipher module.

Returns:: A statically-allocated array of ciphers. The last entry is zero.

Definition at line 66 of file cipher.c.

int mbedtls_cipher_reset ( mbedtls_cipher_context_t * ctx )

This function resets the cipher state.

Parameters:

ctx	The generic cipher context.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.

Definition at line 240 of file cipher.c.

int mbedtls_cipher_set_iv	(	mbedtls_cipher_context_t *	ctx,
		const unsigned char *	iv,
		size_t	iv_len
	)

This function sets the initialization vector (IV) or nonce.

Note:: Some ciphers do not use IVs nor nonce. For these ciphers, this function has no effect.

Parameters:

ctx	The generic cipher context.
iv	The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
iv_len	The IV length for ciphers with variable-size IV. This parameter is discarded by ciphers with fixed-size IV.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.

Definition at line 211 of file cipher.c.

int mbedtls_cipher_set_padding_mode	(	mbedtls_cipher_context_t *	ctx,
		mbedtls_cipher_padding_t	mode
	)

This function sets the padding mode, for cipher modes that use padding.

The default passing mode is PKCS7 padding.

Parameters:

ctx	The generic cipher context.
mode	The padding mode.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE if the selected padding mode is not supported.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if the cipher mode does not support padding.

Definition at line 713 of file cipher.c.

int mbedtls_cipher_setkey	(	mbedtls_cipher_context_t *	ctx,
		const unsigned char *	key,
		int	key_bitlen,
		const mbedtls_operation_t	operation
	)

This function sets the key to use with the given context.

Parameters:

ctx	The generic cipher context. May not be NULL. Must have been initialized using mbedtls_cipher_info_from_type() or mbedtls_cipher_info_from_string().
key	The key to use.
key_bitlen	The key length to use, in bits.
operation	The operation that the key will be used for: MBEDTLS_ENCRYPT or MBEDTLS_DECRYPT.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.; A cipher-specific error code on failure.

Definition at line 178 of file cipher.c.

int mbedtls_cipher_setup	(	mbedtls_cipher_context_t *	ctx,
		const mbedtls_cipher_info_t *	cipher_info
	)

This function initializes and fills the cipher-context structure with the appropriate values.

It also clears the structure.

Parameters:

ctx	The context to initialize. May not be NULL.
cipher_info	The cipher to use.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.; MBEDTLS_ERR_CIPHER_ALLOC_FAILED if allocation of the cipher-specific context fails.

Definition at line 152 of file cipher.c.

int mbedtls_cipher_update	(	mbedtls_cipher_context_t *	ctx,
		const unsigned char *	input,
		size_t	ilen,
		unsigned char *	output,
		size_t *	olen
	)

The generic cipher update function.

It encrypts or decrypts using the given cipher context. Writes as many block-sized blocks of data as possible to output. Any data that cannot be written immediately is either added to the next block, or flushed when mbedtls_cipher_finish() is called. Exception: For MBEDTLS_MODE_ECB, expects a single block in size. For example, 16 Bytes for AES.

Note:: If the underlying cipher is used in GCM mode, all calls to this function, except for the last one before mbedtls_cipher_finish(), must have ilen as a multiple of the block size of the cipher.

Parameters:

ctx	The generic cipher context.
input	The buffer holding the input data.
ilen	The length of the input data.
output	The buffer for the output data. Must be able to hold at least `ilen` + block_size. Must not be the same buffer as input.
olen	The length of the output data, to be updated with the actual number of Bytes written.

Returns:: 0 on success.; MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter-verification failure.; MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE on an unsupported mode for a cipher.; A cipher-specific error code on failure.

Definition at line 267 of file cipher.c.

int mbedtls_cipher_update_ad	(	mbedtls_cipher_context_t *	ctx,
		const unsigned char *	ad,
		size_t	ad_len
	)

This function adds additional data for AEAD ciphers.

Only supported with GCM. Must be called exactly once, after mbedtls_cipher_reset().

Parameters:

ctx	The generic cipher context.
ad	The additional data to use.
ad_len	the Length of `ad`.

Returns:: 0 on success.; A specific error code on failure.

Definition at line 251 of file cipher.c.

int mbedtls_cipher_write_tag	(	mbedtls_cipher_context_t *	ctx,
		unsigned char *	tag,
		size_t	tag_len
	)

This function writes a tag for AEAD ciphers.

Only supported with GCM. Must be called after mbedtls_cipher_finish().

Parameters:

ctx	The generic cipher context.
tag	The buffer to write the tag to.
tag_len	The length of the tag to write.

Returns:: 0 on success.; A specific error code on failure.

Definition at line 761 of file cipher.c.

Type:	Program
Mbed OS support:	Mbed OS
Created:	21 Jun 2018
Imports:	1
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

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