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Update cipher.h
minor changes based on comments
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Rose Zadik
GitHub
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b5607bf61d
@ -72,8 +72,8 @@ extern "C" {
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* \brief Supported cipher types.
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*
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* \warning ARC4 and DES are considered weak ciphers and their use
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* constitutes a security risk. We recommend you consider using
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* stronger ciphers instead.
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* constitutes a security risk. Arm recommends considering stronger
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* ciphers instead.
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*/
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typedef enum {
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MBEDTLS_CIPHER_ID_NONE = 0, /**< None. */
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@ -90,7 +90,7 @@ typedef enum {
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* \brief Supported {cipher type, cipher mode} pairs.
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*
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* \warning ARC4 and DES are considered weak ciphers and their use
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* constitutes a security risk. We recommend considering stronger
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* constitutes a security risk. Arm recommends considering stronger
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* ciphers instead.
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*/
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typedef enum {
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@ -228,8 +228,10 @@ typedef struct {
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*/
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unsigned int iv_size;
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/** Flags to set. For example, if the cipher
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supports variable IV sizes or variable key sizes. */
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/** Bitflag comprised of MBEDTLS_CIPHER_VARIABLE_IV_LEN and
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* MBEDTLS_CIPHER_VARIABLE_KEY_LEN indicating whether the
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* cipher supports variable IV or variable key sizes, respectively.
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*/
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int flags;
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/** The block size, in Bytes. */
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@ -312,7 +314,8 @@ const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( const char *cipher
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* \param cipher_type Type of the cipher to search for.
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*
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* \return The cipher information structure associated with the
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* given \p cipher_type, or NULL if not found.
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* given \p cipher_type.
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* \return NULL if the associated cipher information is not found.
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*/
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const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( const mbedtls_cipher_type_t cipher_type );
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@ -405,9 +408,9 @@ static inline mbedtls_cipher_mode_t mbedtls_cipher_get_cipher_mode( const mbedtl
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*
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* \param ctx The context of the cipher. Must be initialized.
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*
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* \return The recommended IV size, if no IV has been set.
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* 0 for ciphers not using IV or nonce.
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* \return The actual size, if an IV has been set.
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* \return The recommended IV size if no IV has been set.
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* \return 0 for ciphers not using IV or nonce.
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* \return The actual size if an IV has been set.
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*/
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static inline int mbedtls_cipher_get_iv_size( const mbedtls_cipher_context_t *ctx )
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{
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@ -475,10 +478,8 @@ static inline int mbedtls_cipher_get_key_bitlen( const mbedtls_cipher_context_t
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*
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* \param ctx The context of the cipher. Must be initialized.
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*
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* \return The type of operation: #MBEDTLS_ENCRYPT or
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* #MBEDTLS_DECRYPT.
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* \return #MBEDTLS_OPERATION_NONE if \p ctx
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* has not been initialized.
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* \return The type of operation: #MBEDTLS_ENCRYPT or #MBEDTLS_DECRYPT.
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* \return #MBEDTLS_OPERATION_NONE if \p ctx has not been initialized.
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*/
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static inline mbedtls_operation_t mbedtls_cipher_get_operation( const mbedtls_cipher_context_t *ctx )
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{
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@ -499,10 +500,10 @@ static inline mbedtls_operation_t mbedtls_cipher_get_operation( const mbedtls_ci
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* \param operation The operation that the key will be used for:
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* #MBEDTLS_ENCRYPT or #MBEDTLS_DECRYPT.
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*
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* \returns \c 0 on success.
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if
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* parameter verification fails.
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* \return A cipher-specific error code.
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* \return A cipher-specific error code on failure.
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*/
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int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx, const unsigned char *key,
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int key_bitlen, const mbedtls_operation_t operation );
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@ -517,7 +518,7 @@ int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx, const unsigned char *k
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* \param ctx The generic cipher context.
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* \param mode The padding mode.
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*
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* \returns \c 0 on success.
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE
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* if the selected padding mode is not supported.
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* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if the cipher mode
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@ -538,7 +539,7 @@ int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx, mbedtls_ciph
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* \param iv_len The IV length for ciphers with variable-size IV.
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* This parameter is discarded by ciphers with fixed-size IV.
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*
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* \returns \c 0 on success.
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on failure.
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*/
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int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
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@ -549,7 +550,7 @@ int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
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*
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* \param ctx The generic cipher context.
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*
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* \returns \c 0 on success.
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA
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* if parameter verification fails.
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*/
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@ -596,12 +597,12 @@ int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
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* \param olen The length of the output data, to be updated with the
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* actual number of Bytes written.
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*
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* \returns \c 0 on success.
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if
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* parameter verification fails.
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* \return #MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE on an
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* unsupported mode for a cipher.
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* \return A cipher-specific error code.
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* \return A cipher-specific error code on failure.
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*/
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int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *input,
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size_t ilen, unsigned char *output, size_t *olen );
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@ -616,15 +617,14 @@ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *i
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* \param output The buffer to write data to. Needs block_size available.
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* \param olen The length of the data written to the \p output buffer.
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*
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* \returns \c 0 on success.
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if
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* parameter verification fails.
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* \return #MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED if decryption
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* expected a full block but was not provided one.
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* \return #MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding
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* while decrypting.
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* \return A cipher-specific error code on failure for any other
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* reason.
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* \return A cipher-specific error code on failure.
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*/
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int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
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unsigned char *output, size_t *olen );
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@ -681,14 +681,13 @@ int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
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* \note Some ciphers do not use IVs nor nonce. For these
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* ciphers, use \p iv = NULL and \p iv_len = 0.
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*
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* \returns \c 0 on success.
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA, or
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* #MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED if decryption
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* expected a full block but was not provided one.
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* \return #MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding
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* while decrypting.
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* \return A cipher-specific error code on failure for any other
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* reason.
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* \return A cipher-specific error code on failure.
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*/
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int mbedtls_cipher_crypt( mbedtls_cipher_context_t *ctx,
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const unsigned char *iv, size_t iv_len,
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@ -714,9 +713,9 @@ int mbedtls_cipher_crypt( mbedtls_cipher_context_t *ctx,
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* \param tag The buffer for the authentication tag.
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* \param tag_len The desired length of the authentication tag.
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*
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* \returns \c 0 on success.
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA.
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* \return A cipher-specific error code.
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* \return A cipher-specific error code on failure.
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*/
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int mbedtls_cipher_auth_encrypt( mbedtls_cipher_context_t *ctx,
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const unsigned char *iv, size_t iv_len,
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@ -747,10 +746,10 @@ int mbedtls_cipher_auth_encrypt( mbedtls_cipher_context_t *ctx,
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* \param tag The buffer holding the authentication tag.
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* \param tag_len The length of the authentication tag.
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*
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* \returns \c 0 on success.
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA.
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* \return #MBEDTLS_ERR_CIPHER_AUTH_FAILED if data is not authentic.
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* \return A cipher-specific error code on failure for any other reason.
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* \return A cipher-specific error code on failure.
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*/
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int mbedtls_cipher_auth_decrypt( mbedtls_cipher_context_t *ctx,
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const unsigned char *iv, size_t iv_len,
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