aes: add support of aes192 and aes256

Until now, we only support aes128. This commit add the support
of aes192 and aes256.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 26 insertions, 12 deletions

diff --git a/cmd/aes.c b/cmd/aes.c
index 24b0256..8c5b42f 100644
--- a/cmd/aes.c
+++ b/cmd/aes.c
@@ -2,7 +2,7 @@
 /*
  * Copyright (C) 2014 Marek Vasut <marex@denx.de>
  *
- * Command for en/de-crypting block of memory with AES-128-CBC cipher.
+ * Command for en/de-crypting block of memory with AES-[128/192/256]-CBC cipher.
  */
 
 #include <common.h>
@@ -13,6 +13,18 @@
 #include <linux/compiler.h>
 #include <mapmem.h>
 
+u32 aes_get_key_len(char *command)
+{
+	u32 key_len = AES128_KEY_LENGTH;
+
+	if (!strcmp(command, "aes.192"))
+		key_len = AES192_KEY_LENGTH;
+	else if (!strcmp(command, "aes.256"))
+		key_len = AES256_KEY_LENGTH;
+
+	return key_len;
+}
+
 /**
  * do_aes() - Handle the "aes" command-line command
  * @cmdtp:	Command data struct pointer
@@ -27,13 +39,15 @@ static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
 	uint32_t key_addr, iv_addr, src_addr, dst_addr, len;
 	uint8_t *key_ptr, *iv_ptr, *src_ptr, *dst_ptr;
-	uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
-	uint32_t aes_blocks;
+	u8 key_exp[AES256_EXPAND_KEY_LENGTH];
+	u32 aes_blocks, key_len;
 	int enc;
 
 	if (argc != 7)
 		return CMD_RET_USAGE;
 
+	key_len = aes_get_key_len(argv[0]);
+
 	if (!strncmp(argv[1], "enc", 3))
 		enc = 1;
 	else if (!strncmp(argv[1], "dec", 3))
@@ -47,23 +61,23 @@ static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 	dst_addr = simple_strtoul(argv[5], NULL, 16);
 	len = simple_strtoul(argv[6], NULL, 16);
 
-	key_ptr = (uint8_t *)map_sysmem(key_addr, 128 / 8);
+	key_ptr = (uint8_t *)map_sysmem(key_addr, key_len);
 	iv_ptr = (uint8_t *)map_sysmem(iv_addr, 128 / 8);
 	src_ptr = (uint8_t *)map_sysmem(src_addr, len);
 	dst_ptr = (uint8_t *)map_sysmem(dst_addr, len);
 
 	/* First we expand the key. */
-	aes_expand_key(key_ptr, key_exp);
+	aes_expand_key(key_ptr, key_len, key_exp);
 
 	/* Calculate the number of AES blocks to encrypt. */
 	aes_blocks = DIV_ROUND_UP(len, AES_BLOCK_LENGTH);
 
 	if (enc)
-		aes_cbc_encrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr,
-				       aes_blocks);
+		aes_cbc_encrypt_blocks(key_len, key_exp, iv_ptr, src_ptr,
+				       dst_ptr, aes_blocks);
 	else
-		aes_cbc_decrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr,
-				       aes_blocks);
+		aes_cbc_decrypt_blocks(key_len, key_exp, iv_ptr, src_ptr,
+				       dst_ptr, aes_blocks);
 
 	unmap_sysmem(key_ptr);
 	unmap_sysmem(iv_ptr);
@@ -76,13 +90,13 @@ static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 /***************************************************/
 #ifdef CONFIG_SYS_LONGHELP
 static char aes_help_text[] =
-	"enc key iv src dst len - Encrypt block of data $len bytes long\n"
+	"[.128,.192,.256] enc key iv src dst len - Encrypt block of data $len bytes long\n"
 	"                             at address $src using a key at address\n"
 	"                             $key with initialization vector at address\n"
 	"                             $iv. Store the result at address $dst.\n"
 	"                             The $len size must be multiple of 16 bytes.\n"
 	"                             The $key and $iv must be 16 bytes long.\n"
-	"aes dec key iv src dst len - Decrypt block of data $len bytes long\n"
+	"aes [.128,.192,.256] dec key iv src dst len - Decrypt block of data $len bytes long\n"
 	"                             at address $src using a key at address\n"
 	"                             $key with initialization vector at address\n"
 	"                             $iv. Store the result at address $dst.\n"
@@ -92,6 +106,6 @@ static char aes_help_text[] =
 
 U_BOOT_CMD(
 	aes, 7, 1, do_aes,
-	"AES 128 CBC encryption",
+	"AES 128/192/256 CBC encryption",
 	aes_help_text
 );