psa: Add backwards compatible error codes

Add deprecated error codes to help transition between the previous
version of the PSA Crypto specification and the current one.

Author: Patater

include/psa/crypto_values.h

@@ -51,6 +51,10 @@
  * Implementations may use this error code if none of the other standard
  * error codes are applicable. */
 #define PSA_ERROR_GENERIC_ERROR         ((psa_status_t)-132)
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#define PSA_ERROR_UNKNOWN_ERROR \
+    MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_GENERIC_ERROR )
+#endif
 
 /** The requested operation or a parameter is not supported
  * by this implementation.
@@ -91,12 +95,20 @@
  * Implementations should return this error, when attempting
  * to write an item (like a key) that already exists. */
 #define PSA_ERROR_ALREADY_EXISTS        ((psa_status_t)-139)
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#define PSA_ERROR_OCCUPIED_SLOT \
+    MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_ALREADY_EXISTS )
+#endif
 
 /** Asking for an item that doesn't exist
  *
  * Implementations should return this error, if a requested item (like
  * a key) does not exist. */
 #define PSA_ERROR_DOES_NOT_EXIST        ((psa_status_t)-140)
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#define PSA_ERROR_EMPTY_SLOT \
+    MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_DOES_NOT_EXIST )
+#endif
 
 /** The requested action cannot be performed in the current state.
  *
@@ -268,6 +280,10 @@
 /** Return this error when there's insufficient data when attempting
  * to read from a resource. */
 #define PSA_ERROR_INSUFFICIENT_DATA     ((psa_status_t)-143)
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#define PSA_ERROR_INSUFFICIENT_CAPACITY \
+    MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( PSA_ERROR_INSUFFICIENT_DATA )
+#endif
 
 /** The key handle is not valid.
  */