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nodemcu-firmware/app/include/mbedtls/cipher.h
Nathaniel Wesley Filardo 6e95d74fbd Update TLS protocol support (#2587) 
* Update TLS protocol support

TLS1.0 is past PCI's EOL; BEAST is no more
Enable elliptic curve key exchanges
	Do not enable the smallest ECs for security
	Do not enable the largest ECs for computational time
	Do not enable 25519 (sad) because it doesn't go across the wire
Drop non-PFS key exchanges
Drop ARC4, Blowfish, DES, genprime, XTEA code
Drop renegotiation support completely
	It takes so much heap that it's not likely to work out well

Tidy handling of SSL_BUFFER_SIZE

Update docs
Drop mention of startcom, since they are no more, for letsencrypt

* Update mbedtls to 2.7.7

Preserve our vsnprintf and platform hacks

* Introduce TLS maximum fragment size knob

Reduce buffer size to 4Ki by default and advertize that.  That's the
largest we can advertize with the TLS MFL extension, so there's no
point in making them larger.  The truly adventurous can re-raise
SSL_BUFFER_SIZE and undefine the SSL_MAX_FRAGMENT_LENGTH_CODE and get
back to the earlier behavior.

* Default to mbedTLS debug with DEVELOP_VERSION
2019-01-15 17:02:32 +01:00

753 lines
28 KiB
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/**
* \file cipher.h
*
* \brief The generic cipher wrapper.
*
* \author Adriaan de Jong <dejong@fox-it.com>
*/
/*
* Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of Mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_CIPHER_H
#define MBEDTLS_CIPHER_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include <stddef.h>
#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
#define MBEDTLS_CIPHER_MODE_AEAD
#endif
#if defined(MBEDTLS_CIPHER_MODE_CBC)
#define MBEDTLS_CIPHER_MODE_WITH_PADDING
#endif
#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
#define MBEDTLS_CIPHER_MODE_STREAM
#endif
#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
!defined(inline) && !defined(__cplusplus)
#define inline __inline
#endif
#define MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE -0x6080 /**< The selected feature is not available. */
#define MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA -0x6100 /**< Bad input parameters. */
#define MBEDTLS_ERR_CIPHER_ALLOC_FAILED -0x6180 /**< Failed to allocate memory. */
#define MBEDTLS_ERR_CIPHER_INVALID_PADDING -0x6200 /**< Input data contains invalid padding and is rejected. */
#define MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED -0x6280 /**< Decryption of block requires a full block. */
#define MBEDTLS_ERR_CIPHER_AUTH_FAILED -0x6300 /**< Authentication failed (for AEAD modes). */
#define MBEDTLS_ERR_CIPHER_INVALID_CONTEXT -0x6380 /**< The context is invalid. For example, because it was freed. */
#define MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED -0x6400 /**< Cipher hardware accelerator failed. */
#define MBEDTLS_CIPHER_VARIABLE_IV_LEN 0x01 /**< Cipher accepts IVs of variable length. */
#define MBEDTLS_CIPHER_VARIABLE_KEY_LEN 0x02 /**< Cipher accepts keys of variable length. */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief An enumeration of supported ciphers.
*
* \warning ARC4 and DES are considered weak ciphers and their use
* constitutes a security risk. We recommend considering stronger
* ciphers instead.
*/
typedef enum {
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_t;
/**
* \brief An enumeration of supported (cipher, mode) pairs.
*
* \warning ARC4 and DES are considered weak ciphers and their use
* constitutes a security risk. We recommend considering stronger
* ciphers instead.
*/
typedef enum {
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_type_t;
/** Supported cipher modes. */
typedef enum {
MBEDTLS_MODE_NONE = 0,
MBEDTLS_MODE_ECB,
MBEDTLS_MODE_CBC,
MBEDTLS_MODE_CFB,
MBEDTLS_MODE_OFB, /* Unused! */
MBEDTLS_MODE_CTR,
MBEDTLS_MODE_GCM,
MBEDTLS_MODE_STREAM,
MBEDTLS_MODE_CCM,
} mbedtls_cipher_mode_t;
/** Supported cipher padding types. */
typedef enum {
MBEDTLS_PADDING_PKCS7 = 0, /**< 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). */
} mbedtls_cipher_padding_t;
/** Type of operation. */
typedef enum {
MBEDTLS_OPERATION_NONE = -1,
MBEDTLS_DECRYPT = 0,
MBEDTLS_ENCRYPT,
} mbedtls_operation_t;
enum {
/** Undefined key length. */
MBEDTLS_KEY_LENGTH_NONE = 0,
/** Key length, in bits (including parity), for DES keys. */
MBEDTLS_KEY_LENGTH_DES = 64,
/** Key length in bits, including parity, for DES in two-key EDE. */
MBEDTLS_KEY_LENGTH_DES_EDE = 128,
/** Key length in bits, including parity, for DES in three-key EDE. */
MBEDTLS_KEY_LENGTH_DES_EDE3 = 192,
};
/** Maximum length of any IV, in Bytes. */
#define MBEDTLS_MAX_IV_LENGTH 16
/** Maximum block size of any cipher, in Bytes. */
#define MBEDTLS_MAX_BLOCK_LENGTH 16
/**
* Base cipher information (opaque struct).
*/
typedef struct mbedtls_cipher_base_t mbedtls_cipher_base_t;
/**
* CMAC context (opaque struct).
*/
typedef struct mbedtls_cmac_context_t mbedtls_cmac_context_t;
/**
* Cipher information. Allows calling cipher functions
* in a generic way.
*/
typedef struct {
/** Full cipher identifier. For example,
* MBEDTLS_CIPHER_AES_256_CBC.
*/
mbedtls_cipher_type_t type;
/** The cipher mode. For example, MBEDTLS_MODE_CBC. */
mbedtls_cipher_mode_t mode;
/** The cipher key length, in bits. This is the
* default length for variable sized ciphers.
* Includes parity bits for ciphers like DES.
*/
unsigned int key_bitlen;
/** Name of the cipher. */
const char * name;
/** IV or nonce size, in Bytes.
* For ciphers that accept variable IV sizes,
* this is the recommended size.
*/
unsigned int iv_size;
/** Flags to set. For example, if the cipher supports variable IV sizes or variable key sizes. */
int flags;
/** The block size, in Bytes. */
unsigned int block_size;
/** Struct for base cipher information and functions. */
const mbedtls_cipher_base_t *base;
} mbedtls_cipher_info_t;
/**
* Generic cipher context.
*/
typedef struct {
/** Information about the associated cipher. */
const mbedtls_cipher_info_t *cipher_info;
/** Key length to use. */
int key_bitlen;
/** Operation that the key of the context has been
* initialized for.
*/
mbedtls_operation_t operation;
#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
/** Padding functions to use, if relevant for
* the specific cipher mode.
*/
void (*add_padding)( unsigned char *output, size_t olen, size_t data_len );
int (*get_padding)( unsigned char *input, size_t ilen, size_t *data_len );
#endif
/** Buffer for input that has not been processed yet. */
unsigned char unprocessed_data[MBEDTLS_MAX_BLOCK_LENGTH];
/** Number of Bytes that have not been processed yet. */
size_t unprocessed_len;
/** Current IV or NONCE_COUNTER for CTR-mode. */
unsigned char iv[MBEDTLS_MAX_IV_LENGTH];
/** IV size in Bytes, for ciphers with variable-length IVs. */
size_t iv_size;
/** The cipher-specific context. */
void *cipher_ctx;
#if defined(MBEDTLS_CMAC_C)
/** CMAC-specific context. */
mbedtls_cmac_context_t *cmac_ctx;
#endif
} mbedtls_cipher_context_t;
/**
* \brief This function retrieves the list of ciphers supported by the generic
* cipher module.
*
* \return A statically-allocated array of ciphers. The last entry
* is zero.
*/
const int *mbedtls_cipher_list( void );
/**
* \brief This function retrieves the cipher-information
* structure associated with the given cipher name.
*
* \param cipher_name Name of the cipher to search for.
*
* \return The cipher information structure associated with the
* given \p cipher_name, or NULL if not found.
*/
const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( const char *cipher_name );
/**
* \brief This function retrieves the cipher-information
* structure associated with the given cipher type.
*
* \param cipher_type Type of the cipher to search for.
*
* \return The cipher information structure associated with the
* given \p cipher_type, or NULL if not found.
*/
const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( const mbedtls_cipher_type_t cipher_type );
/**
* \brief This function retrieves the cipher-information
* structure associated with the given cipher ID,
* key size and mode.
*
* \param cipher_id The ID of the cipher to search for. For example,
* #MBEDTLS_CIPHER_ID_AES.
* \param key_bitlen The length of the key in bits.
* \param mode The cipher mode. For example, #MBEDTLS_MODE_CBC.
*
* \return The cipher information structure associated with the
* given \p cipher_id, or NULL if not found.
*/
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 );
/**
* \brief This function initializes a \p cipher_context as NONE.
*/
void mbedtls_cipher_init( mbedtls_cipher_context_t *ctx );
/**
* \brief This function frees and clears the cipher-specific
* context of \p ctx. Freeing \p ctx itself remains the
* responsibility of the caller.
*/
void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx );
/**
* \brief This function initializes and fills the cipher-context
* structure with the appropriate values. It also clears
* the structure.
*
* \param ctx The context to initialize. May not be NULL.
* \param cipher_info The cipher to use.
*
* \return \c 0 on success,
* #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on parameter failure,
* #MBEDTLS_ERR_CIPHER_ALLOC_FAILED if allocation of the
* cipher-specific context failed.
*
* \internal Currently, the function also clears the structure.
* In future versions, the caller will be required to call
* mbedtls_cipher_init() on the structure first.
*/
int mbedtls_cipher_setup( mbedtls_cipher_context_t *ctx, const mbedtls_cipher_info_t *cipher_info );
/**
* \brief This function returns the block size of the given cipher.
*
* \param ctx The context of the cipher. Must be initialized.
*
* \return The size of the blocks of the cipher, or zero if \p ctx
* has not been initialized.
*/
static inline unsigned int mbedtls_cipher_get_block_size( const mbedtls_cipher_context_t *ctx )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return 0;
return ctx->cipher_info->block_size;
}
/**
* \brief This function returns the mode of operation for
* the cipher. For example, MBEDTLS_MODE_CBC.
*
* \param ctx The context of the cipher. Must be initialized.
*
* \return The mode of operation, or #MBEDTLS_MODE_NONE if
* \p ctx has not been initialized.
*/
static inline mbedtls_cipher_mode_t mbedtls_cipher_get_cipher_mode( const mbedtls_cipher_context_t *ctx )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return MBEDTLS_MODE_NONE;
return ctx->cipher_info->mode;
}
/**
* \brief This function returns the size of the IV or nonce
* of the cipher, in Bytes.
*
* \param ctx The context of the cipher. Must be initialized.
*
* \return <ul><li>If no IV has been set: the recommended IV size.
* 0 for ciphers not using IV or nonce.</li>
* <li>If IV has already been set: the actual size.</li></ul>
*/
static inline int mbedtls_cipher_get_iv_size( const mbedtls_cipher_context_t *ctx )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return 0;
if( ctx->iv_size != 0 )
return (int) ctx->iv_size;
return (int) ctx->cipher_info->iv_size;
}
/**
* \brief This function returns the type of the given cipher.
*
* \param ctx The context of the cipher. Must be initialized.
*
* \return The type of the cipher, or #MBEDTLS_CIPHER_NONE if
* \p ctx has not been initialized.
*/
static inline mbedtls_cipher_type_t mbedtls_cipher_get_type( const mbedtls_cipher_context_t *ctx )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return MBEDTLS_CIPHER_NONE;
return ctx->cipher_info->type;
}
/**
* \brief This function returns the name of the given cipher
* as a string.
*
* \param ctx The context of the cipher. Must be initialized.
*
* \return The name of the cipher, or NULL if \p ctx has not
* been not initialized.
*/
static inline const char *mbedtls_cipher_get_name( const mbedtls_cipher_context_t *ctx )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return 0;
return ctx->cipher_info->name;
}
/**
* \brief This function returns the key length of the cipher.
*
* \param ctx The context of the cipher. Must be initialized.
*
* \return The key length of the cipher in bits, or
* #MBEDTLS_KEY_LENGTH_NONE if ctx \p has not been
* initialized.
*/
static inline int mbedtls_cipher_get_key_bitlen( const mbedtls_cipher_context_t *ctx )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return MBEDTLS_KEY_LENGTH_NONE;
return (int) ctx->cipher_info->key_bitlen;
}
/**
* \brief This function returns the operation of the given cipher.
*
* \param ctx The context of the cipher. Must be initialized.
*
* \return The type of operation: #MBEDTLS_ENCRYPT or
* #MBEDTLS_DECRYPT, or #MBEDTLS_OPERATION_NONE if \p ctx
* has not been initialized.
*/
static inline mbedtls_operation_t mbedtls_cipher_get_operation( const mbedtls_cipher_context_t *ctx )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return MBEDTLS_OPERATION_NONE;
return ctx->operation;
}
/**
* \brief This function sets the key to use with the given context.
*
* \param 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().
* \param key The key to use.
* \param key_bitlen The key length to use, in bits.
* \param operation The operation that the key will be used for:
* #MBEDTLS_ENCRYPT or #MBEDTLS_DECRYPT.
*
* \returns \c 0 on success, #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if
* parameter verification fails, or a cipher-specific
* error code.
*/
int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx, const unsigned char *key,
int key_bitlen, const mbedtls_operation_t operation );
#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
/**
* \brief This function sets the padding mode, for cipher modes
* that use padding.
*
* The default passing mode is PKCS7 padding.
*
* \param ctx The generic cipher context.
* \param mode The padding mode.
*
* \returns \c 0 on success, #MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE
* if the selected padding mode is not supported, or
* #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if the cipher mode
* does not support padding.
*/
int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx, mbedtls_cipher_padding_t mode );
#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
/**
* \brief This function sets the initialization vector (IV)
* or nonce.
*
* \param ctx The generic cipher context.
* \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
* \param iv_len The IV length for ciphers with variable-size IV.
* This parameter is discarded by ciphers with fixed-size IV.
*
* \returns \c 0 on success, or #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
*
* \note Some ciphers do not use IVs nor nonce. For these
* ciphers, this function has no effect.
*/
int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
const unsigned char *iv, size_t iv_len );
/**
* \brief This function resets the cipher state.
*
* \param ctx The generic cipher context.
*
* \returns \c 0 on success, #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
* if parameter verification fails.
*/
int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx );
#if defined(MBEDTLS_GCM_C)
/**
* \brief This function adds additional data for AEAD ciphers.
* Only supported with GCM. Must be called
* exactly once, after mbedtls_cipher_reset().
*
* \param ctx The generic cipher context.
* \param ad The additional data to use.
* \param ad_len the Length of \p ad.
*
* \return \c 0 on success, or a specific error code on failure.
*/
int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
const unsigned char *ad, size_t ad_len );
#endif /* MBEDTLS_GCM_C */
/**
* \brief 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.
*
* \param ctx The generic cipher context.
* \param input The buffer holding the input data.
* \param ilen The length of the input data.
* \param output The buffer for the output data. Must be able to hold at
* least \p ilen + block_size. Must not be the same buffer
* as input.
* \param olen The length of the output data, to be updated with the
* actual number of Bytes written.
*
* \returns \c 0 on success, #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if
* parameter verification fails,
* #MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE on an
* unsupported mode for a cipher, or a cipher-specific
* error code.
*
* \note If the underlying cipher is GCM, all calls to this
* function, except the last one before
* mbedtls_cipher_finish(). Must have \p ilen as a
* multiple of the block_size.
*/
int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *input,
size_t ilen, unsigned char *output, size_t *olen );
/**
* \brief 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 \p output buffer.
*
* \param ctx The generic cipher context.
* \param output The buffer to write data to. Needs block_size available.
* \param olen The length of the data written to the \p output buffer.
*
* \returns \c 0 on success, #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if
* parameter verification fails,
* #MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED if decryption
* expected a full block but was not provided one,
* #MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding
* while decrypting, or a cipher-specific error code
* on failure for any other reason.
*/
int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
unsigned char *output, size_t *olen );
#if defined(MBEDTLS_GCM_C)
/**
* \brief This function writes a tag for AEAD ciphers.
* Only supported with GCM.
* Must be called after mbedtls_cipher_finish().
*
* \param ctx The generic cipher context.
* \param tag The buffer to write the tag to.
* \param tag_len The length of the tag to write.
*
* \return \c 0 on success, or a specific error code on failure.
*/
int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx,
unsigned char *tag, size_t tag_len );
/**
* \brief This function checks the tag for AEAD ciphers.
* Only supported with GCM.
* Must be called after mbedtls_cipher_finish().
*
* \param ctx The generic cipher context.
* \param tag The buffer holding the tag.
* \param tag_len The length of the tag to check.
*
* \return \c 0 on success, or a specific error code on failure.
*/
int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
const unsigned char *tag, size_t tag_len );
#endif /* MBEDTLS_GCM_C */
/**
* \brief The generic all-in-one encryption/decryption function,
* for all ciphers except AEAD constructs.
*
* \param ctx The generic cipher context.
* \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
* \param iv_len The IV length for ciphers with variable-size IV.
* This parameter is discarded by ciphers with fixed-size
* IV.
* \param input The buffer holding the input data.
* \param ilen The length of the input data.
* \param output The buffer for the output data. Must be able to hold at
* least \p ilen + block_size. Must not be the same buffer
* as input.
* \param 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 \p iv = NULL and \p iv_len = 0.
*
* \returns \c 0 on success, or
* #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA, or
* #MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED if decryption
* expected a full block but was not provided one, or
* #MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding
* while decrypting, or a cipher-specific error code on
* failure for any other reason.
*/
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 );
#if defined(MBEDTLS_CIPHER_MODE_AEAD)
/**
* \brief The generic autenticated encryption (AEAD) function.
*
* \param ctx The generic cipher context.
* \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
* \param iv_len The IV length for ciphers with variable-size IV.
* This parameter is discarded by ciphers with fixed-size IV.
* \param ad The additional data to authenticate.
* \param ad_len The length of \p ad.
* \param input The buffer holding the input data.
* \param ilen The length of the input data.
* \param output The buffer for the output data.
* Must be able to hold at least \p ilen.
* \param olen The length of the output data, to be updated with the
* actual number of Bytes written.
* \param tag The buffer for the authentication tag.
* \param tag_len The desired length of the authentication tag.
*
* \returns \c 0 on success, or
* #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA, or
* a cipher-specific error code.
*/
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 );
/**
* \brief The generic autenticated decryption (AEAD) function.
*
* \param ctx The generic cipher context.
* \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
* \param iv_len The IV length for ciphers with variable-size IV.
* This parameter is discarded by ciphers with fixed-size IV.
* \param ad The additional data to be authenticated.
* \param ad_len The length of \p ad.
* \param input The buffer holding the input data.
* \param ilen The length of the input data.
* \param output The buffer for the output data.
* Must be able to hold at least \p ilen.
* \param olen The length of the output data, to be updated with the
* actual number of Bytes written.
* \param tag The buffer holding the authentication tag.
* \param tag_len The length of the authentication tag.
*
* \returns \c 0 on success, or
* #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA, or
* #MBEDTLS_ERR_CIPHER_AUTH_FAILED if data is not authentic,
* or a cipher-specific error code on failure for any other reason.
*
* \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.
*/
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 );
#endif /* MBEDTLS_CIPHER_MODE_AEAD */
#ifdef __cplusplus
}
#endif
#endif /* MBEDTLS_CIPHER_H */
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