cipher.h

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/*
 *  Copyright The Mbed TLS Contributors
 *  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.
 */

#ifndef MBEDTLS_CIPHER_H
#define MBEDTLS_CIPHER_H
#include "mbedtls/private_access.h"

#include "mbedtls/build_info.h"

#include <stddef.h>
#include "mbedtls/platform_util.h"

#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
#define MBEDTLS_CIPHER_MODE_AEAD
#endif

#if defined(MBEDTLS_CIPHER_MODE_CBC)
#define MBEDTLS_CIPHER_MODE_WITH_PADDING
#endif

#if defined(MBEDTLS_CIPHER_NULL_CIPHER) || \
    defined(MBEDTLS_CHACHA20_C)
#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

#define MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA       -0x6100

#define MBEDTLS_ERR_CIPHER_ALLOC_FAILED         -0x6180

#define MBEDTLS_ERR_CIPHER_INVALID_PADDING      -0x6200

#define MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED  -0x6280

#define MBEDTLS_ERR_CIPHER_AUTH_FAILED          -0x6300

#define MBEDTLS_ERR_CIPHER_INVALID_CONTEXT      -0x6380

#define MBEDTLS_CIPHER_VARIABLE_IV_LEN     0x01    
#define MBEDTLS_CIPHER_VARIABLE_KEY_LEN    0x02    
#ifdef __cplusplus
extern "C" {
#endif

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_ARIA,      
    MBEDTLS_CIPHER_ID_CHACHA20,  
} mbedtls_cipher_id_t;

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_AES_128_CCM,          
    MBEDTLS_CIPHER_AES_192_CCM,          
    MBEDTLS_CIPHER_AES_256_CCM,          
    MBEDTLS_CIPHER_AES_128_CCM_STAR_NO_TAG, 
    MBEDTLS_CIPHER_AES_192_CCM_STAR_NO_TAG, 
    MBEDTLS_CIPHER_AES_256_CCM_STAR_NO_TAG, 
    MBEDTLS_CIPHER_CAMELLIA_128_CCM,     
    MBEDTLS_CIPHER_CAMELLIA_192_CCM,     
    MBEDTLS_CIPHER_CAMELLIA_256_CCM,     
    MBEDTLS_CIPHER_CAMELLIA_128_CCM_STAR_NO_TAG, 
    MBEDTLS_CIPHER_CAMELLIA_192_CCM_STAR_NO_TAG, 
    MBEDTLS_CIPHER_CAMELLIA_256_CCM_STAR_NO_TAG, 
    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,         
    MBEDTLS_CIPHER_ARIA_128_CCM_STAR_NO_TAG, 
    MBEDTLS_CIPHER_ARIA_192_CCM_STAR_NO_TAG, 
    MBEDTLS_CIPHER_ARIA_256_CCM_STAR_NO_TAG, 
    MBEDTLS_CIPHER_AES_128_OFB,          
    MBEDTLS_CIPHER_AES_192_OFB,          
    MBEDTLS_CIPHER_AES_256_OFB,          
    MBEDTLS_CIPHER_AES_128_XTS,          
    MBEDTLS_CIPHER_AES_256_XTS,          
    MBEDTLS_CIPHER_CHACHA20,             
    MBEDTLS_CIPHER_CHACHA20_POLY1305,    
    MBEDTLS_CIPHER_AES_128_KW,           
    MBEDTLS_CIPHER_AES_192_KW,           
    MBEDTLS_CIPHER_AES_256_KW,           
    MBEDTLS_CIPHER_AES_128_KWP,          
    MBEDTLS_CIPHER_AES_192_KWP,          
    MBEDTLS_CIPHER_AES_256_KWP,          
} mbedtls_cipher_type_t;

typedef enum {
    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,                    
    MBEDTLS_MODE_CCM_STAR_NO_TAG,        
    MBEDTLS_MODE_XTS,                    
    MBEDTLS_MODE_CHACHAPOLY,             
    MBEDTLS_MODE_KW,                     
    MBEDTLS_MODE_KWP,                    
} mbedtls_cipher_mode_t;

typedef enum {
    MBEDTLS_PADDING_PKCS7 = 0,     
    MBEDTLS_PADDING_ONE_AND_ZEROS, 
    MBEDTLS_PADDING_ZEROS_AND_LEN, 
    MBEDTLS_PADDING_ZEROS,         
    MBEDTLS_PADDING_NONE,          
} mbedtls_cipher_padding_t;

typedef enum {
    MBEDTLS_OPERATION_NONE = -1,
    MBEDTLS_DECRYPT = 0,
    MBEDTLS_ENCRYPT,
} mbedtls_operation_t;

enum {
    MBEDTLS_KEY_LENGTH_NONE = 0,
    MBEDTLS_KEY_LENGTH_DES  = 64,
    MBEDTLS_KEY_LENGTH_DES_EDE = 128,
    MBEDTLS_KEY_LENGTH_DES_EDE3 = 192,
};

/* This should ideally be derived automatically from list of ciphers.
 * This should be kept in sync with MBEDTLS_SSL_MAX_IV_LENGTH defined
 * in library/ssl_misc.h. */
#define MBEDTLS_MAX_IV_LENGTH      16

/* This should ideally be derived automatically from list of ciphers.
 * This should be kept in sync with MBEDTLS_SSL_MAX_BLOCK_LENGTH defined
 * in library/ssl_misc.h. */
#define MBEDTLS_MAX_BLOCK_LENGTH   16

/* This should ideally be derived automatically from list of ciphers.
 * For now, only check whether XTS is enabled which uses 64 Byte keys,
 * and use 32 Bytes as an upper bound for the maximum key length otherwise.
 * This should be kept in sync with MBEDTLS_SSL_MAX_BLOCK_LENGTH defined
 * in library/ssl_misc.h, which however deliberately ignores the case of XTS
 * since the latter isn't used in SSL/TLS. */
#if defined(MBEDTLS_CIPHER_MODE_XTS)
#define MBEDTLS_MAX_KEY_LENGTH     64
#else
#define MBEDTLS_MAX_KEY_LENGTH     32
#endif /* MBEDTLS_CIPHER_MODE_XTS */

typedef struct mbedtls_cipher_base_t mbedtls_cipher_base_t;

typedef struct mbedtls_cmac_context_t mbedtls_cmac_context_t;

typedef struct mbedtls_cipher_info_t
{
    mbedtls_cipher_type_t MBEDTLS_PRIVATE(type);

    mbedtls_cipher_mode_t MBEDTLS_PRIVATE(mode);

    unsigned int MBEDTLS_PRIVATE(key_bitlen);

    const char * MBEDTLS_PRIVATE(name);

    unsigned int MBEDTLS_PRIVATE(iv_size);

    int MBEDTLS_PRIVATE(flags);

    unsigned int MBEDTLS_PRIVATE(block_size);

    const mbedtls_cipher_base_t *MBEDTLS_PRIVATE(base);

} mbedtls_cipher_info_t;

typedef struct mbedtls_cipher_context_t
{
    const mbedtls_cipher_info_t *MBEDTLS_PRIVATE(cipher_info);

    int MBEDTLS_PRIVATE(key_bitlen);

    mbedtls_operation_t MBEDTLS_PRIVATE(operation);

#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)

    void (*MBEDTLS_PRIVATE(add_padding))( unsigned char *output, size_t olen, size_t data_len );
    int (*MBEDTLS_PRIVATE(get_padding))( unsigned char *input, size_t ilen, size_t *data_len );
#endif

    unsigned char MBEDTLS_PRIVATE(unprocessed_data)[MBEDTLS_MAX_BLOCK_LENGTH];

    size_t MBEDTLS_PRIVATE(unprocessed_len);

    unsigned char MBEDTLS_PRIVATE(iv)[MBEDTLS_MAX_IV_LENGTH];

    size_t MBEDTLS_PRIVATE(iv_size);

    void *MBEDTLS_PRIVATE(cipher_ctx);

#if defined(MBEDTLS_CMAC_C)

    mbedtls_cmac_context_t *MBEDTLS_PRIVATE(cmac_ctx);
#endif

#if defined(MBEDTLS_USE_PSA_CRYPTO)

    unsigned char MBEDTLS_PRIVATE(psa_enabled);
#endif /* MBEDTLS_USE_PSA_CRYPTO */

} mbedtls_cipher_context_t;

const int *mbedtls_cipher_list( void );

const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( const char *cipher_name );

const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( const mbedtls_cipher_type_t 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 );

static inline mbedtls_cipher_type_t mbedtls_cipher_info_get_type(
    const mbedtls_cipher_info_t *info )
{
    if( info == NULL )
        return( MBEDTLS_CIPHER_NONE );
    else
        return( info->MBEDTLS_PRIVATE(type) );
}

static inline mbedtls_cipher_mode_t mbedtls_cipher_info_get_mode(
    const mbedtls_cipher_info_t *info )
{
    if( info == NULL )
        return( MBEDTLS_MODE_NONE );
    else
        return( info->MBEDTLS_PRIVATE(mode) );
}

static inline size_t mbedtls_cipher_info_get_key_bitlen(
    const mbedtls_cipher_info_t *info )
{
    if( info == NULL )
        return( 0 );
    else
        return( info->MBEDTLS_PRIVATE(key_bitlen) );
}

static inline const char *mbedtls_cipher_info_get_name(
    const mbedtls_cipher_info_t *info )
{
    if( info == NULL )
        return( NULL );
    else
        return( info->MBEDTLS_PRIVATE(name) );
}

static inline size_t mbedtls_cipher_info_get_iv_size(
    const mbedtls_cipher_info_t *info )
{
    if( info == NULL )
        return( 0 );

    return( (size_t) info->MBEDTLS_PRIVATE(iv_size) );
}

static inline size_t mbedtls_cipher_info_get_block_size(
    const mbedtls_cipher_info_t *info )
{
    if( info == NULL )
        return( 0 );

    return( (size_t) info->MBEDTLS_PRIVATE(block_size) );
}

static inline int mbedtls_cipher_info_has_variable_key_bitlen(
    const mbedtls_cipher_info_t *info )
{
    if( info == NULL )
        return( 0 );

    return( info->MBEDTLS_PRIVATE(flags) & MBEDTLS_CIPHER_VARIABLE_KEY_LEN );
}

static inline int mbedtls_cipher_info_has_variable_iv_size(
    const mbedtls_cipher_info_t *info )
{
    if( info == NULL )
        return( 0 );

    return( info->MBEDTLS_PRIVATE(flags) & MBEDTLS_CIPHER_VARIABLE_IV_LEN );
}

void mbedtls_cipher_init( mbedtls_cipher_context_t *ctx );

void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx );


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

#if defined(MBEDTLS_USE_PSA_CRYPTO)

int mbedtls_cipher_setup_psa( mbedtls_cipher_context_t *ctx,
                              const mbedtls_cipher_info_t *cipher_info,
                              size_t taglen );
#endif /* MBEDTLS_USE_PSA_CRYPTO */

static inline unsigned int mbedtls_cipher_get_block_size(
    const mbedtls_cipher_context_t *ctx )
{
    MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, 0 );
    if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL )
        return 0;

    return ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(block_size);
}

static inline mbedtls_cipher_mode_t mbedtls_cipher_get_cipher_mode(
    const mbedtls_cipher_context_t *ctx )
{
    MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, MBEDTLS_MODE_NONE );
    if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL )
        return MBEDTLS_MODE_NONE;

    return ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(mode);
}

static inline int mbedtls_cipher_get_iv_size(
    const mbedtls_cipher_context_t *ctx )
{
    MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, 0 );
    if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL )
        return 0;

    if( ctx->MBEDTLS_PRIVATE(iv_size) != 0 )
        return (int) ctx->MBEDTLS_PRIVATE(iv_size);

    return (int) ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(iv_size);
}

static inline mbedtls_cipher_type_t mbedtls_cipher_get_type(
    const mbedtls_cipher_context_t *ctx )
{
    MBEDTLS_INTERNAL_VALIDATE_RET(
        ctx != NULL, MBEDTLS_CIPHER_NONE );
    if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL )
        return MBEDTLS_CIPHER_NONE;

    return ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(type);
}

static inline const char *mbedtls_cipher_get_name(
    const mbedtls_cipher_context_t *ctx )
{
    MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, 0 );
    if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL )
        return 0;

    return ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(name);
}

static inline int mbedtls_cipher_get_key_bitlen(
    const mbedtls_cipher_context_t *ctx )
{
    MBEDTLS_INTERNAL_VALIDATE_RET(
        ctx != NULL, MBEDTLS_KEY_LENGTH_NONE );
    if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL )
        return MBEDTLS_KEY_LENGTH_NONE;

    return (int) ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(key_bitlen);
}

static inline mbedtls_operation_t mbedtls_cipher_get_operation(
    const mbedtls_cipher_context_t *ctx )
{
    MBEDTLS_INTERNAL_VALIDATE_RET(
        ctx != NULL, MBEDTLS_OPERATION_NONE );
    if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL )
        return MBEDTLS_OPERATION_NONE;

    return ctx->MBEDTLS_PRIVATE(operation);
}

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)

int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx,
                                     mbedtls_cipher_padding_t mode );
#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */

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

int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx );

#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)

int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
                      const unsigned char *ad, size_t ad_len );
#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */

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

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

#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)

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

int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
                      const unsigned char *tag, size_t tag_len );
#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_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 );

#if defined(MBEDTLS_CIPHER_MODE_AEAD) || defined(MBEDTLS_NIST_KW_C)

int mbedtls_cipher_auth_encrypt_ext( 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 output_len,
                         size_t *olen, size_t tag_len );

int mbedtls_cipher_auth_decrypt_ext( 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 output_len,
                         size_t *olen, size_t tag_len );
#endif /* MBEDTLS_CIPHER_MODE_AEAD || MBEDTLS_NIST_KW_C */
#ifdef __cplusplus
}
#endif

#endif /* MBEDTLS_CIPHER_H */