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cmac: improve parameter validation documentation
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@ -100,7 +100,7 @@ int mbedtls_cipher_cmac_starts( mbedtls_cipher_context_t *ctx,
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* This must be initialized.
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* \param input The buffer holding the input data. This must be a
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* readable buffer of length \p ilen Bytes. It may be
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* \c NULL if ilen == 0.
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* \c NULL if `ilen == 0`.
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* \param ilen The length of the input data.
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*
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* \return \c 0 on success.
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@ -121,7 +121,8 @@ int mbedtls_cipher_cmac_update( mbedtls_cipher_context_t *ctx,
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* \param ctx The cipher context used for the CMAC operation.
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* This must be initialized.
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* \param output The output buffer for the CMAC checksum result.
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* This must not be \c NULL.
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* This must be a writable buffer of length equal to
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* at least the block-size of the underlying cipher.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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@ -163,10 +164,11 @@ int mbedtls_cipher_cmac_reset( mbedtls_cipher_context_t *ctx );
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* \param keylen The length of the CMAC key in bits.
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* \param input The buffer holding the input data. This must be a
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* readable buffer of length \p ilen Bytes. It may be
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* \c NULL if ilen == 0.
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* \c NULL if `ilen == 0`.
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* \param ilen The length of the input data.
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* \param output The buffer for the generic CMAC result.
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* This must not be \c NULL.
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* This must be a writable buffer of length equal to
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* at least the block-size of the underlying cipher.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_MD_BAD_INPUT_DATA
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@ -191,7 +193,8 @@ int mbedtls_cipher_cmac( const mbedtls_cipher_info_t *cipher_info,
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* \param input The buffer holding the input data. This must not be \c NULL.
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* \param in_len The length of the input data in Bytes.
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* \param output The buffer holding the generated 16 Bytes of
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* pseudorandom output. This must not be \c NULL.
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* pseudorandom output. This must be a writable buffer of size
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* \c 16 Bytes.
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*
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* \return \c 0 on success.
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*/
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