Update documentation
Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
diff --git a/library/psa_crypto_cipher.h b/library/psa_crypto_cipher.h
index 2dd3330..39e5688 100644
--- a/library/psa_crypto_cipher.h
+++ b/library/psa_crypto_cipher.h
@@ -213,14 +213,26 @@
* \param[in] alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
- * \param[in] input Buffer containing the iv and the plaintext.
+ * \param[in] input Buffer containing the message to encrypt.
* \param[in] input_length Size of the \p input buffer in bytes.
* \param[in,out] output Buffer where the output is to be written.
- * The IV must be written to this buffer before
- * this function is called.
- * \param[in] output_size Size of the \p output buffer in bytes.
- * \param[out] output_length On success, the number of bytes
- * that make up the returned output.
+ * The core has generated and written the IV
+ * at the beginning of this buffer before
+ * this function is called. The size of the IV
+ * is PSA_CIPHER_IV_LENGTH( key_type, alg ) where
+ * \c key_type is the type of the key identified
+ * by \p key and \p alg is the cipher algorithm
+ * to compute.
+ * \param[in] output_size Size of the \p output buffer in bytes. The core
+ * has checked that this size is greater or equal to
+ * PSA_CIPHER_ENCRYPT_OUTPUT_SIZE( key_type, alg, input_length )
+ * where \c key_type is the type of the key
+ * identified by \p key, \p alg is the cipher
+ * algorithm to compute and \p input_length is the
+ * size of the \p input buffer.
+ * \param[out] output_length On success, the number of bytes that make up
+ * the returned output. Initialized to zero
+ * by the core.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_NOT_SUPPORTED
@@ -263,12 +275,20 @@
* \param[in] alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
- * \param[in] input Buffer containing the iv and the ciphertext.
+ * \param[in] input Buffer containing the iv and the ciphertext.
* \param[in] input_length Size of the \p input buffer in bytes.
* \param[out] output Buffer where the output is to be written.
* \param[in] output_size Size of the \p output buffer in bytes.
- * \param[out] output_length On success, the number of bytes
- * that make up the returned output.
+ * The core has checked that this size is
+ * greater or equal to
+ * PSA_CIPHER_DECRYPT_OUTPUT_SIZE( key_type, alg, input_length )
+ * where \c key_type is the type of the key
+ * identified by \p key, \p alg is the cipher
+ * algorithm to compute and \p input_length is the
+ * size of the \p input buffer.
+ * \param[out] output_length On success, the number of bytes that make up
+ * the returned output. Initialized to zero
+ * by the core.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_NOT_SUPPORTED
