iPod Classic: hardware AES and SHA1 for bootloader

Based on emCORE.

Low level functions that do not depend on Rockbox kernel,
intended to be used by the bootloader, dualboot-installer,
RB drivers or other .dfu tools.

Change-Id: I3c616ded42260c6626bda23b7e580791981df61d

2 files changed, 148 insertions, 0 deletions

diff --git a/firmware/target/arm/s5l8702/crypto-s5l8702.c b/firmware/target/arm/s5l8702/crypto-s5l8702.c
new file mode 100644
index 0000000000..e81711add2
--- /dev/null
+++ b/firmware/target/arm/s5l8702/crypto-s5l8702.c
@@ -0,0 +1,102 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright © 2009 Michael Sparmann
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include "config.h"
+#include "system.h"
+
+#include "s5l8702.h"
+#include "clocking-s5l8702.h"
+#include "crypto-s5l8702.h"
+
+void hwkeyaes(enum hwkeyaes_direction direction, uint32_t keyidx, void* data, uint32_t size)
+{
+    int i;
+    clockgate_enable(CLOCKGATE_AES, true);
+    for (i = 0; i < 4; i++) AESIV[i] = 0;
+    AESUNKREG0 = 1;
+    AESUNKREG0 = 0;
+    AESCONTROL = 1;
+    AESUNKREG1 = 0;
+    AESTYPE = keyidx;
+    AESTYPE2 = ~AESTYPE;
+    AESUNKREG2 = 0;
+    AESKEYLEN = direction == HWKEYAES_ENCRYPT ? 9 : 8;
+    AESOUTSIZE = size;
+    AESOUTADDR = data;
+    AESINSIZE = size;
+    AESINADDR = data;
+    AESAUXSIZE = size;
+    AESAUXADDR = data;
+    AESSIZE3 = size;
+    commit_discard_dcache();
+    AESGO = 1;
+    while (!(AESSTATUS & 0xf));
+    clockgate_enable(CLOCKGATE_AES, false);
+}
+
+void sha1(void* data, uint32_t size, void* hash)
+{
+    int i, space;
+    bool done = false;
+    uint32_t tmp32[16];
+    uint8_t* tmp8 = (uint8_t*)tmp32;
+    uint32_t* databuf = (uint32_t*)data;
+    uint32_t* hashbuf = (uint32_t*)hash;
+    clockgate_enable(CLOCKGATE_SHA, true);
+    SHA1RESET = 1;
+    while (SHA1CONFIG & 1);
+    SHA1RESET = 0;
+    SHA1CONFIG = 0;
+    while (!done)
+    {
+        space = ((uint32_t)databuf) - ((uint32_t)data) - size + 64;
+        if (space > 0)
+        {
+            for (i = 0; i < 16; i++) tmp32[i] = 0;
+            if (space <= 64)
+            {
+                for (i = 0; i < 64 - space; i++)
+                    tmp8[i] = ((uint8_t*)databuf)[i];
+                tmp8[64 - space] = 0x80;
+            }
+            if (space >= 8)
+            {
+                tmp8[0x3b] = (size >> 29) & 0xff;
+                tmp8[0x3c] = (size >> 21) & 0xff;
+                tmp8[0x3d] = (size >> 13) & 0xff;
+                tmp8[0x3e] = (size >> 5) & 0xff;
+                tmp8[0x3f] = (size << 3) & 0xff;
+                done = true;
+            }
+            for (i = 0; i < 16; i++) SHA1DATAIN[i] = tmp32[i];
+        }
+        else
+            for (i = 0; i < 16; i++) SHA1DATAIN[i] = *databuf++;
+        SHA1CONFIG |= 2;
+        while (SHA1CONFIG & 1);
+        SHA1CONFIG |= 8;
+    }
+    for (i = 0; i < 5; i++) *hashbuf++ = SHA1RESULT[i];
+    clockgate_enable(CLOCKGATE_SHA, false);
+}
diff --git a/firmware/target/arm/s5l8702/crypto-s5l8702.h b/firmware/target/arm/s5l8702/crypto-s5l8702.h
new file mode 100644
index 0000000000..541a67889c
--- /dev/null
+++ b/firmware/target/arm/s5l8702/crypto-s5l8702.h
@@ -0,0 +1,46 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id:
+ *
+ * Copyright © 2009 Michael Sparmann
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef __CRYPTO_S5L8702_H__
+#define __CRYPTO_S5L8702_H__
+
+#include <stdint.h>
+
+#include "config.h"
+
+#define SHA1_SZ     20  /* bytes */
+
+enum hwkeyaes_direction
+{
+    HWKEYAES_DECRYPT = 0,
+    HWKEYAES_ENCRYPT = 1
+};
+
+enum hwkeyaes_keyidx
+{
+    HWKEYAES_GKEY = 1,  /* device model key */
+    HWKEYAES_UKEY = 2   /* device unique key */
+};
+
+void hwkeyaes(enum hwkeyaes_direction direction,
+        uint32_t keyidx, void* data, uint32_t size);
+void sha1(void* data, uint32_t size, void* hash);
+
+#endif /* __CRYPTO_S5L8702_H__ */