Document the internal function psa_cipher_update_ecb
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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1 changed files with 24 additions and 4 deletions
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@ -255,10 +255,30 @@ static psa_status_t cipher_set_iv( mbedtls_psa_cipher_operation_t *operation,
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iv, iv_length ) ) );
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}
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/* Process input for which the algorithm is set to ECB mode. This requires
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* manual processing, since the PSA API is defined as being able to process
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* arbitrary-length calls to psa_cipher_update() with ECB mode, but the
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* underlying mbedtls_cipher_update only takes full blocks. */
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/** Process input for which the algorithm is set to ECB mode.
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*
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* This requires manual processing, since the PSA API is defined as being
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* able to process arbitrary-length calls to psa_cipher_update() with ECB mode,
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* but the underlying mbedtls_cipher_update only takes full blocks.
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*
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* \param ctx The mbedtls cipher context to use. It must have been
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* set up for ECB.
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* \param[in] input The input plaintext or ciphertext to process.
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* \param input_length The number of bytes to process from \p input.
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* This does not need to be aligned to a block boundary.
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* If there is a partial block at the end of the input,
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* it is stored in \p ctx for future processing.
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* \param output The buffer where the output is written.
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* \param output_size The size of \p output in bytes.
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* It must be at least `floor((p + input_length) / BS)`
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* where `p` is the number of bytes in the unprocessed
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* partial block in \p ctx (`0 <= p <= BS - 1`) and
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* `BS` is the block size.
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* \param output_length On success, the number of bytes written to \p output.
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* \c 0 on error.
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*
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* \return #PSA_SUCCESS or an error from a hardware accelerator
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*/
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static psa_status_t psa_cipher_update_ecb(
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mbedtls_cipher_context_t *ctx,
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const uint8_t *input,
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