Fix doc on buffer requirements of GCM API
Signed-off-by: Chien Wong <m@xv97.com>
diff --git a/tf-psa-crypto/drivers/builtin/include/mbedtls/gcm.h b/tf-psa-crypto/drivers/builtin/include/mbedtls/gcm.h
index 72632fa..e620be7 100644
--- a/tf-psa-crypto/drivers/builtin/include/mbedtls/gcm.h
+++ b/tf-psa-crypto/drivers/builtin/include/mbedtls/gcm.h
@@ -109,10 +109,9 @@
/**
* \brief This function performs GCM encryption or decryption of a buffer.
*
- * \note For encryption, the output buffer can be the same as the
- * input buffer. For decryption, the output buffer cannot be
- * the same as input buffer. If the buffers overlap, the output
- * buffer must trail at least 8 Bytes behind the input buffer.
+ * \note The output buffer \p output can be the same as the input
+ * buffer \p input. If \p output is greater than \p input, they
+ * cannot overlap.
*
* \warning When this function performs a decryption, it outputs the
* authentication tag and does not verify that the data is
@@ -173,9 +172,9 @@
* \brief This function performs a GCM authenticated decryption of a
* buffer.
*
- * \note For decryption, the output buffer cannot be the same as
- * input buffer. If the buffers overlap, the output buffer
- * must trail at least 8 Bytes behind the input buffer.
+ * \note The output buffer \p output can be the same as the input
+ * buffer \p input. If \p output is greater than \p input, they
+ * cannot overlap.
*
* \param ctx The GCM context. This must be initialized.
* \param length The length of the ciphertext to decrypt, which is also
@@ -281,9 +280,9 @@
* to this function during an operation, then it is
* correct to use \p output_size = \p input_length.
*
- * \note For decryption, the output buffer cannot be the same as
- * input buffer. If the buffers overlap, the output buffer
- * must trail at least 8 Bytes behind the input buffer.
+ * \note The output buffer \p output can be the same as the input
+ * buffer \p input. If \p output is greater than \p input, they
+ * cannot overlap.
*
* \param ctx The GCM context. This must be initialized.
* \param input The buffer holding the input data. If \p input_length