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Remove psa_key_derivation() and associated static functions
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k-stachowiak
parent
89e7655691
commit
0b74cf85ea
@ -224,65 +224,6 @@ void mbedtls_psa_get_stats( mbedtls_psa_stats_t *stats );
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psa_status_t mbedtls_psa_inject_entropy(uint8_t *seed,
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size_t seed_size);
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#if defined(PSA_PRE_1_0_KEY_DERIVATION)
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/** Set up a key derivation operation.
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*
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* FIMXE This function is no longer part of the official API. Its prototype
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* is only kept around for the sake of tests that haven't been updated yet.
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*
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* A key derivation algorithm takes three inputs: a secret input \p handle and
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* two non-secret inputs \p label and p salt.
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* The result of this function is a byte generator which can
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* be used to produce keys and other cryptographic material.
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*
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* The role of \p label and \p salt is as follows:
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* - For HKDF (#PSA_ALG_HKDF), \p salt is the salt used in the "extract" step
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* and \p label is the info string used in the "expand" step.
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*
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* \param[in,out] operation The key derivation object to set up. It must
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* have been initialized as per the documentation
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* for #psa_key_derivation_operation_t and not
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* yet be in use.
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* \param handle Handle to the secret key.
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* \param alg The key derivation algorithm to compute
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* (\c PSA_ALG_XXX value such that
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* #PSA_ALG_IS_KEY_DERIVATION(\p alg) is true).
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* \param[in] salt Salt to use.
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* \param salt_length Size of the \p salt buffer in bytes.
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* \param[in] label Label to use.
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* \param label_length Size of the \p label buffer in bytes.
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* \param capacity The maximum number of bytes that the
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* operation will be able to provide.
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*
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* \retval #PSA_SUCCESS
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* Success.
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* \retval #PSA_ERROR_INVALID_HANDLE
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* \retval #PSA_ERROR_EMPTY_SLOT
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* \retval #PSA_ERROR_NOT_PERMITTED
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* \c key is not compatible with \c alg,
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* or \p capacity is too large for the specified algorithm and key.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* \c alg is not supported or is not a key derivation algorithm.
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* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
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* \retval #PSA_ERROR_COMMUNICATION_FAILURE
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* \retval #PSA_ERROR_HARDWARE_FAILURE
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* \retval #PSA_ERROR_CORRUPTION_DETECTED
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* \retval #PSA_ERROR_BAD_STATE
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* The library has not been previously initialized by psa_crypto_init().
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* It is implementation-dependent whether a failure to initialize
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* results in this error code.
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*/
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psa_status_t psa_key_derivation(psa_key_derivation_operation_t *operation,
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psa_key_handle_t handle,
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psa_algorithm_t alg,
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const uint8_t *salt,
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size_t salt_length,
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const uint8_t *label,
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size_t label_length,
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size_t capacity);
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#endif /* PSA_PRE_1_0_KEY_DERIVATION */
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/** \addtogroup crypto_types
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* @{
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*/
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@ -4804,284 +4804,6 @@ psa_status_t psa_key_derivation_output_key( const psa_key_attributes_t *attribut
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/* Key derivation */
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/****************************************************************/
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#if defined(MBEDTLS_MD_C)
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#if defined(PSA_PRE_1_0_KEY_DERIVATION)
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/* Set up an HKDF-based operation. This is exactly the extract phase
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* of the HKDF algorithm.
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*
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* Note that if this function fails, you must call psa_key_derivation_abort()
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* to potentially free embedded data structures and wipe confidential data.
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*/
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static psa_status_t psa_key_derivation_hkdf_setup( psa_hkdf_key_derivation_t *hkdf,
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const uint8_t *secret,
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size_t secret_length,
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psa_algorithm_t hash_alg,
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const uint8_t *salt,
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size_t salt_length,
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const uint8_t *label,
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size_t label_length )
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{
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psa_status_t status;
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status = psa_hmac_setup_internal( &hkdf->hmac,
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salt, salt_length,
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hash_alg );
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if( status != PSA_SUCCESS )
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return( status );
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status = psa_hash_update( &hkdf->hmac.hash_ctx, secret, secret_length );
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if( status != PSA_SUCCESS )
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return( status );
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status = psa_hmac_finish_internal( &hkdf->hmac,
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hkdf->prk,
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sizeof( hkdf->prk ) );
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if( status != PSA_SUCCESS )
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return( status );
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hkdf->offset_in_block = PSA_HASH_SIZE( hash_alg );
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hkdf->block_number = 0;
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hkdf->info_length = label_length;
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if( label_length != 0 )
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{
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hkdf->info = mbedtls_calloc( 1, label_length );
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if( hkdf->info == NULL )
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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memcpy( hkdf->info, label, label_length );
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}
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hkdf->state = HKDF_STATE_KEYED;
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hkdf->info_set = 1;
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return( PSA_SUCCESS );
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}
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#endif /* PSA_PRE_1_0_KEY_DERIVATION */
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#endif /* MBEDTLS_MD_C */
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#if defined(MBEDTLS_MD_C)
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#if defined(PSA_PRE_1_0_KEY_DERIVATION)
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/* Set up a TLS-1.2-prf-based operation (see RFC 5246, Section 5).
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*
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* Note that if this function fails, you must call psa_key_derivation_abort()
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* to potentially free embedded data structures and wipe confidential data.
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*/
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static psa_status_t psa_key_derivation_tls12_prf_setup(
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psa_tls12_prf_key_derivation_t *tls12_prf,
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const uint8_t *key,
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size_t key_len,
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psa_algorithm_t hash_alg,
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const uint8_t *salt,
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size_t salt_length,
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const uint8_t *label,
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size_t label_length )
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{
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uint8_t hash_length = PSA_HASH_SIZE( hash_alg );
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size_t Ai_with_seed_len = hash_length + salt_length + label_length;
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int overflow;
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tls12_prf->key = mbedtls_calloc( 1, key_len );
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if( tls12_prf->key == NULL )
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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tls12_prf->key_len = key_len;
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memcpy( tls12_prf->key, key, key_len );
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overflow = ( salt_length + label_length < salt_length ) ||
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( salt_length + label_length + hash_length < hash_length );
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if( overflow )
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return( PSA_ERROR_INVALID_ARGUMENT );
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tls12_prf->Ai_with_seed = mbedtls_calloc( 1, Ai_with_seed_len );
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if( tls12_prf->Ai_with_seed == NULL )
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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tls12_prf->Ai_with_seed_len = Ai_with_seed_len;
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/* Write `label + seed' at the end of the `A(i) + seed` buffer,
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* leaving the initial `hash_length` bytes unspecified for now. */
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if( label_length != 0 )
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{
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memcpy( tls12_prf->Ai_with_seed + hash_length,
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label, label_length );
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}
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if( salt_length != 0 )
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{
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memcpy( tls12_prf->Ai_with_seed + hash_length + label_length,
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salt, salt_length );
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}
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/* The first block gets generated when
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* psa_key_derivation_output_bytes() is called. */
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tls12_prf->block_number = 0;
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tls12_prf->offset_in_block = hash_length;
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return( PSA_SUCCESS );
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}
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#endif /* PSA_PRE_1_0_KEY_DERIVATION */
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#if defined(PSA_PRE_1_0_KEY_DERIVATION)
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/* Set up a TLS-1.2-PSK-to-MS-based operation. */
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static psa_status_t psa_key_derivation_tls12_psk_to_ms_setup(
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psa_tls12_prf_key_derivation_t *tls12_prf,
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const uint8_t *psk,
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size_t psk_len,
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psa_algorithm_t hash_alg,
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const uint8_t *salt,
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size_t salt_length,
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const uint8_t *label,
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size_t label_length )
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{
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psa_status_t status;
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uint8_t pms[ 4 + 2 * PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN ];
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if( psk_len > PSA_ALG_TLS12_PSK_TO_MS_MAX_PSK_LEN )
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return( PSA_ERROR_INVALID_ARGUMENT );
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/* Quoting RFC 4279, Section 2:
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*
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* The premaster secret is formed as follows: if the PSK is N octets
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* long, concatenate a uint16 with the value N, N zero octets, a second
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* uint16 with the value N, and the PSK itself.
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*/
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pms[0] = ( psk_len >> 8 ) & 0xff;
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pms[1] = ( psk_len >> 0 ) & 0xff;
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memset( pms + 2, 0, psk_len );
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pms[2 + psk_len + 0] = pms[0];
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pms[2 + psk_len + 1] = pms[1];
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memcpy( pms + 4 + psk_len, psk, psk_len );
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status = psa_key_derivation_tls12_prf_setup( tls12_prf,
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pms, 4 + 2 * psk_len,
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hash_alg,
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salt, salt_length,
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label, label_length );
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mbedtls_platform_zeroize( pms, sizeof( pms ) );
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return( status );
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}
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#endif /* PSA_PRE_1_0_KEY_DERIVATION */
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#endif /* MBEDTLS_MD_C */
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#if defined(PSA_PRE_1_0_KEY_DERIVATION)
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/* Note that if this function fails, you must call psa_key_derivation_abort()
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* to potentially free embedded data structures and wipe confidential data.
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*/
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static psa_status_t psa_key_derivation_internal(
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psa_key_derivation_operation_t *operation,
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const uint8_t *secret, size_t secret_length,
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psa_algorithm_t alg,
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const uint8_t *salt, size_t salt_length,
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const uint8_t *label, size_t label_length,
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size_t capacity )
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{
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psa_status_t status;
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size_t max_capacity;
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/* Set operation->alg even on failure so that abort knows what to do. */
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operation->alg = alg;
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#if defined(MBEDTLS_MD_C)
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if( PSA_ALG_IS_HKDF( alg ) )
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{
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psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( alg );
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size_t hash_size = PSA_HASH_SIZE( hash_alg );
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if( hash_size == 0 )
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return( PSA_ERROR_NOT_SUPPORTED );
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max_capacity = 255 * hash_size;
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status = psa_key_derivation_hkdf_setup( &operation->ctx.hkdf,
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secret, secret_length,
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hash_alg,
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salt, salt_length,
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label, label_length );
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}
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/* TLS-1.2 PRF and TLS-1.2 PSK-to-MS are very similar, so share code. */
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else if( PSA_ALG_IS_TLS12_PRF( alg ) ||
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PSA_ALG_IS_TLS12_PSK_TO_MS( alg ) )
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{
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psa_algorithm_t hash_alg = PSA_ALG_TLS12_PRF_GET_HASH( alg );
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size_t hash_size = PSA_HASH_SIZE( hash_alg );
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/* TLS-1.2 PRF supports only SHA-256 and SHA-384. */
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if( hash_alg != PSA_ALG_SHA_256 &&
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hash_alg != PSA_ALG_SHA_384 )
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{
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return( PSA_ERROR_NOT_SUPPORTED );
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}
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max_capacity = 255 * hash_size;
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if( PSA_ALG_IS_TLS12_PRF( alg ) )
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{
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status = psa_key_derivation_tls12_prf_setup( &operation->ctx.tls12_prf,
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secret, secret_length,
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hash_alg, salt, salt_length,
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label, label_length );
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}
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else
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{
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status = psa_key_derivation_tls12_psk_to_ms_setup(
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&operation->ctx.tls12_prf,
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secret, secret_length,
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hash_alg, salt, salt_length,
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label, label_length );
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}
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}
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else
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#endif
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{
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return( PSA_ERROR_NOT_SUPPORTED );
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}
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if( status != PSA_SUCCESS )
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return( status );
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if( capacity <= max_capacity )
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operation->capacity = capacity;
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else if( capacity == PSA_KEY_DERIVATION_UNLIMITED_CAPACITY )
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operation->capacity = max_capacity;
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else
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return( PSA_ERROR_INVALID_ARGUMENT );
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return( PSA_SUCCESS );
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}
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#endif /* PSA_PRE_1_0_KEY_DERIVATION */
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#if defined(PSA_PRE_1_0_KEY_DERIVATION)
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psa_status_t psa_key_derivation( psa_key_derivation_operation_t *operation,
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psa_key_handle_t handle,
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psa_algorithm_t alg,
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const uint8_t *salt,
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size_t salt_length,
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const uint8_t *label,
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size_t label_length,
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size_t capacity )
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{
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psa_key_slot_t *slot;
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psa_status_t status;
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if( operation->alg != 0 )
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return( PSA_ERROR_BAD_STATE );
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/* Make sure that alg is a key derivation algorithm. This prevents
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* key selection algorithms, which psa_key_derivation_internal
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* accepts for the sake of key agreement. */
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if( ! PSA_ALG_IS_KEY_DERIVATION( alg ) )
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return( PSA_ERROR_INVALID_ARGUMENT );
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status = psa_get_transparent_key( handle, &slot, PSA_KEY_USAGE_DERIVE, alg );
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if( status != PSA_SUCCESS )
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return( status );
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if( slot->attr.type != PSA_KEY_TYPE_DERIVE )
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return( PSA_ERROR_INVALID_ARGUMENT );
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status = psa_key_derivation_internal( operation,
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slot->data.raw.data,
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slot->data.raw.bytes,
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alg,
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salt, salt_length,
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label, label_length,
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capacity );
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if( status != PSA_SUCCESS )
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psa_key_derivation_abort( operation );
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return( status );
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}
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#endif /* PSA_PRE_1_0_KEY_DERIVATION */
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static psa_status_t psa_key_derivation_setup_kdf(
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psa_key_derivation_operation_t *operation,
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psa_algorithm_t kdf_alg )
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