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https://github.com/cuberite/polarssl.git
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Only compile AES CMAC PRF support if MBEDTLS_AES_C is defined and other cleanups
This commit is contained in:
Brian Murray
Simon Butcher
parent
d666eb5c11
commit
afdb60f84f
@ -33,12 +33,12 @@ extern "C" {
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#endif
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/**
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* \brief CCM context structure
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* \brief CMAC context structure
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*/
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typedef struct {
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mbedtls_cipher_context_t cipher_ctx; /*!< cipher context used */
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unsigned char* K1;
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unsigned char* K2;
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unsigned char* K1; /*!< CMAC Subkey 1 */
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unsigned char* K2; /*!< CMAC Subkey 2 */
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}
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mbedtls_cmac_context;
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@ -52,12 +52,12 @@ mbedtls_cmac_context;
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void mbedtls_cmac_init( mbedtls_cmac_context *ctx );
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/**
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* \brief CMAC initialization
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* \brief Initialize the CMAC context
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*
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* \param ctx CMAC context to be initialized
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* \param cipher cipher to use (a 128-bit block cipher)
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* \param cipher cipher to use
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* \param key encryption key
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* \param keybits key size in bits (must be acceptable by the cipher)
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* \param keybits encryption key size in bits (must be acceptable by the cipher)
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*
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* \return 0 if successful, or a cipher specific error code
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*/
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@ -68,20 +68,22 @@ int mbedtls_cmac_setkey( mbedtls_cmac_context *ctx,
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/**
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* \brief Free a CMAC context and underlying cipher sub-context
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* Securely wipes sub keys and other sensitive data.
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*
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* \param ctx CMAC context to free
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*/
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void mbedtls_cmac_free( mbedtls_cmac_context *ctx );
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/**
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* \brief CMAC generate
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* \brief Generate a CMAC tag.
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*
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* \param ctx CMAC context
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* \param input buffer holding the input data
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* \param in_len length of the input data in bytes
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* \param tag buffer for holding the generated tag
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* \param tag_len length of the tag to generate in bytes
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* must be between 4, 6, 8, 10, 14 or 16
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* Must be 4, 6, 8 if cipher block size is 64
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* Must be 4, 6, 8 0, 14 or 16 if cipher block size is 128
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*
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* \return 0 if successful
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*/
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@ -90,47 +92,48 @@ int mbedtls_cmac_generate( mbedtls_cmac_context *ctx,
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unsigned char *tag, size_t tag_len );
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/**
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* \brief CMAC verify
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* \brief Verify a CMAC tag.
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*
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* \param ctx CMAC context
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* \param input buffer holding the input data
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* \param in_len length of the input data in bytes
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* \param tag buffer holding the tag to verify
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* \param tag_len length of the tag to verify in bytes
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* must be 4, 6, 8, 10, 14 or 16
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*
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* \return 0 if successful and authenticated,
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* Must be 4, 6, 8 if cipher block size is 64
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* Must be 4, 6, 8 0, 14 or 16 if cipher block size is 128
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* \return 0 if successful and authenticated
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* MBEDTLS_ERR_CMAC_VERIFY_FAILED if tag does not match
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*/
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int mbedtls_cmac_verify( mbedtls_cmac_context *ctx,
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const unsigned char *input, size_t in_len,
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const unsigned char *tag, size_t tag_len );
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#ifdef MBEDTLS_AES_C
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/**
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* \brief AES-CMAC-128-PRF
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* See RFC
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* See RFC 4615 for details
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*
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* \param key PRF key
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* \param key_len PRF key length
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* \param input buffer holding the input data
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* \param in_len length of the input data in bytes
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* \param tag buffer holding the tag to verify (16 bytes)
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* TODO: update description of tag
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*
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* \return 0 if successful
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*/
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int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_len,
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const unsigned char *input, size_t in_len,
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unsigned char *tag );
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unsigned char tag[16] );
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#endif /* MBEDTLS_AES_C */
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#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
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#if defined(MBEDTLS_SELF_TEST) && ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C) )
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/**
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if the test failed
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*/
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int mbedtls_cmac_self_test( int verbose );
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#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
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#endif /* MBEDTLS_SELF_TEST && ( MBEDTLS_AES_C || MBEDTLS_DES_C ) */
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#ifdef __cplusplus
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}
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@ -73,7 +73,7 @@ void mbedtls_cmac_init( mbedtls_cmac_context *ctx )
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*/
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static int cmac_multiply_by_u( unsigned char *output,
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const unsigned char *input,
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size_t blocksize)
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size_t blocksize )
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{
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const unsigned char R_128 = 0x87;
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@ -84,12 +84,12 @@ static int cmac_multiply_by_u( unsigned char *output,
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starting_index = blocksize -1;
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if(blocksize == 16){
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if( blocksize == 16 ){
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R_n = R_128;
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} else if(blocksize == 8) {
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} else if( blocksize == 8 ) {
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R_n = R_64;
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} else {
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return MBEDTLS_ERR_CMAC_BAD_INPUT;
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return( MBEDTLS_ERR_CMAC_BAD_INPUT );
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}
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@ -113,7 +113,7 @@ static int cmac_multiply_by_u( unsigned char *output,
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#endif
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output[starting_index] ^= R_n & mask;
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return 0;
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return( 0 );
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}
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/*
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@ -128,7 +128,7 @@ static int cmac_generate_subkeys( mbedtls_cmac_context *ctx )
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ret = 0;
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block_size = ctx->cipher_ctx.cipher_info->block_size;
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L = mbedtls_calloc(block_size, sizeof(unsigned char));
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L = mbedtls_calloc( block_size, sizeof( unsigned char ) );
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/* Calculate Ek(0) */
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memset( L, 0, block_size );
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@ -141,15 +141,15 @@ static int cmac_generate_subkeys( mbedtls_cmac_context *ctx )
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/*
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* Generate K1 and K2
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*/
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if( ( ret = cmac_multiply_by_u( ctx->K1, L , block_size) ) != 0 )
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if( ( ret = cmac_multiply_by_u( ctx->K1, L , block_size ) ) != 0 )
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goto exit;
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if( ( cmac_multiply_by_u( ctx->K2, ctx->K1 , block_size) ) != 0 )
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if( ( cmac_multiply_by_u( ctx->K2, ctx->K1 , block_size ) ) != 0 )
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goto exit;
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exit:
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mbedtls_zeroize( L, sizeof( L ) );
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free(L);
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return ret;
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free( L );
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return( ret );
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}
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/*
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@ -195,8 +195,8 @@ void mbedtls_cmac_free( mbedtls_cmac_context *ctx )
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mbedtls_cipher_free( &ctx->cipher_ctx );
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mbedtls_zeroize(ctx->K1, block_size * sizeof( unsigned char ) );
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mbedtls_zeroize(ctx->K2, block_size * sizeof( unsigned char ) );
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mbedtls_zeroize( ctx->K1, block_size * sizeof( unsigned char ) );
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mbedtls_zeroize( ctx->K2, block_size * sizeof( unsigned char ) );
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mbedtls_free( ctx->K1 );
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mbedtls_free( ctx->K2 );
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}
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@ -263,8 +263,8 @@ int mbedtls_cmac_generate( mbedtls_cmac_context *ctx,
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ret = 0;
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block_size = ctx->cipher_ctx.cipher_info->block_size;
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state = mbedtls_calloc(block_size, sizeof(unsigned char) );
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M_last = mbedtls_calloc(block_size, sizeof(unsigned char) );
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state = mbedtls_calloc( block_size, sizeof( unsigned char ) );
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M_last = mbedtls_calloc( block_size, sizeof( unsigned char ) );
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/*
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* Check in_len requirements: SP800-38B A
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@ -302,8 +302,8 @@ int mbedtls_cmac_generate( mbedtls_cmac_context *ctx,
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memcpy( tag, state, tag_len );
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exit:
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free(state);
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free(M_last);
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free( state );
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free( M_last );
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return( ret );
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}
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@ -322,8 +322,8 @@ int mbedtls_cmac_verify( mbedtls_cmac_context *ctx,
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unsigned char i;
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int diff;
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check_tag = mbedtls_calloc(ctx->cipher_ctx.cipher_info->block_size,
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sizeof(unsigned char) );
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check_tag = mbedtls_calloc( ctx->cipher_ctx.cipher_info->block_size,
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sizeof( unsigned char ) );
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if( ( ret = mbedtls_cmac_generate( ctx, input, in_len,
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check_tag, tag_len ) ) != 0 )
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@ -340,24 +340,25 @@ int mbedtls_cmac_verify( mbedtls_cmac_context *ctx,
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goto exit;
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exit:
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free(check_tag);
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return ret;
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free( check_tag );
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return( ret );
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}
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#ifdef MBEDTLS_AES_C
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/*
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* PRF based on CMAC with AES-128
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* See RFC 4615
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*/
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int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_length,
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const unsigned char *input, size_t in_len,
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unsigned char *tag )
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unsigned char tag[16] )
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{
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int ret;
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mbedtls_cmac_context ctx;
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unsigned char zero_key[16];
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unsigned char int_key[16];
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mbedtls_cmac_init(&ctx);
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mbedtls_cmac_init(&ctx );
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if( key_length == 16 )
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{
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@ -368,7 +369,7 @@ int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_length,
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{
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mbedtls_cmac_context zero_ctx;
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/* Key is AES_CMAC(0, key) */
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/* Key is AES_CMAC( 0, key ) */
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mbedtls_cmac_init( &zero_ctx );
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memset( zero_key, 0, 16 );
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ret = mbedtls_cmac_setkey( &zero_ctx, MBEDTLS_CIPHER_ID_AES,
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@ -391,11 +392,10 @@ int mbedtls_aes_cmac_prf_128( const unsigned char *key, size_t key_length,
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ret = mbedtls_cmac_generate( &ctx, input, in_len, tag, 16 );
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exit:
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mbedtls_cmac_free(&ctx);
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mbedtls_cmac_free( &ctx );
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return( ret );
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}
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#endif /* MBEDTLS_AES_C */
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#ifdef MBEDTLS_SELF_TEST
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/*
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@ -647,7 +647,7 @@ static const unsigned char PRFT[NB_PRF_TESTS][16] = {
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};
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#endif /* MBEDTLS_AES_C */
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int test_cmac_with_cipher(int verbose,
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int test_cmac_with_cipher( int verbose,
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const unsigned char* testname,
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const unsigned char* key,
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int keybits,
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@ -656,7 +656,7 @@ int test_cmac_with_cipher(int verbose,
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const unsigned char* subkeys,
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const unsigned char* expected_result,
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mbedtls_cipher_id_t cipher_id,
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int block_size)
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int block_size )
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{
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const int num_tests = 4;
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mbedtls_cmac_context ctx;
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@ -743,7 +743,7 @@ int mbedtls_cmac_self_test( int verbose )
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int ret;
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#ifdef MBEDTLS_AES_C
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test_cmac_with_cipher(verbose,
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test_cmac_with_cipher( verbose,
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"AES 128",
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aes_128_key,
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128,
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@ -754,7 +754,7 @@ int mbedtls_cmac_self_test( int verbose )
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MBEDTLS_CIPHER_ID_AES,
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AES_BLOCK_SIZE );
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test_cmac_with_cipher(verbose,
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test_cmac_with_cipher( verbose,
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"AES 192",
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aes_192_key,
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192,
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@ -765,7 +765,7 @@ int mbedtls_cmac_self_test( int verbose )
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MBEDTLS_CIPHER_ID_AES,
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AES_BLOCK_SIZE );
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test_cmac_with_cipher(verbose,
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test_cmac_with_cipher ( verbose,
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"AES 256",
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aes_256_key,
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256,
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@ -778,7 +778,7 @@ int mbedtls_cmac_self_test( int verbose )
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#endif /* MBEDTLS_AES_C */
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#ifdef MBEDTLS_DES_C
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test_cmac_with_cipher(verbose,
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test_cmac_with_cipher( verbose,
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"3DES 2 key",
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des3_2key_key,
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192,
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@ -789,7 +789,7 @@ int mbedtls_cmac_self_test( int verbose )
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MBEDTLS_CIPHER_ID_3DES,
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DES3_BLOCK_SIZE );
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test_cmac_with_cipher(verbose,
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test_cmac_with_cipher( verbose,
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"3DES 3 key",
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des3_3key_key,
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192,
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