feat(st-crypto): add AES decrypt/auth by SAES IP
Add code to be able to use STMicroelectronics SAES IP. This driver
can manage many AES algorithms (CBC, ECB, CCM, GCM). It will be used
by the authenticated decryption framework (AES-GCM only).
Change-Id: Ibd4030719fb12877dcecd5d2c395d13b4b15c260
Signed-off-by: Nicolas Toromanoff <nicolas.toromanoff@st.com>
diff --git a/include/drivers/st/stm32_saes.h b/include/drivers/st/stm32_saes.h
new file mode 100644
index 0000000..0a50438
--- /dev/null
+++ b/include/drivers/st/stm32_saes.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2022, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef STM32_SAES_H
+#define STM32_SAES_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#define DT_SAES_COMPAT "st,stm32-saes"
+
+struct stm32_saes_platdata {
+ uintptr_t base;
+ unsigned long clock_id;
+ unsigned int reset_id;
+};
+
+enum stm32_saes_chaining_mode {
+ STM32_SAES_MODE_ECB,
+ STM32_SAES_MODE_CBC,
+ STM32_SAES_MODE_CTR,
+ STM32_SAES_MODE_GCM,
+ STM32_SAES_MODE_CCM, /* Not use in TF-A */
+};
+
+enum stm32_saes_key_selection {
+ STM32_SAES_KEY_SOFT,
+ STM32_SAES_KEY_DHU, /* Derived HW unique key */
+ STM32_SAES_KEY_BH, /* Boot HW key */
+ STM32_SAES_KEY_BHU_XOR_BH, /* XOR of DHUK and BHK */
+ STM32_SAES_KEY_WRAPPED
+};
+
+struct stm32_saes_context {
+ uintptr_t base;
+ uint32_t cr;
+ uint32_t assoc_len;
+ uint32_t load_len;
+ uint32_t key[8]; /* In HW byte order */
+ uint32_t iv[4]; /* In HW byte order */
+};
+
+int stm32_saes_driver_init(void);
+
+int stm32_saes_init(struct stm32_saes_context *ctx, bool is_decrypt,
+ enum stm32_saes_chaining_mode ch_mode, enum stm32_saes_key_selection key_select,
+ const void *key, size_t key_len, const void *iv, size_t iv_len);
+int stm32_saes_update(struct stm32_saes_context *ctx, bool last_block,
+ uint8_t *data_in, uint8_t *data_out, size_t data_len);
+int stm32_saes_update_assodata(struct stm32_saes_context *ctx, bool last_block,
+ uint8_t *data, size_t data_len);
+int stm32_saes_update_load(struct stm32_saes_context *ctx, bool last_block,
+ uint8_t *data_in, uint8_t *data_out, size_t data_len);
+int stm32_saes_final(struct stm32_saes_context *ctx, uint8_t *tag, size_t tag_len);
+#endif