[PATCH v3 14/16] ARM: tegra: crypto: extend crypto functional
Svyatoslav Ryhel
clamor95 at gmail.com
Fri Feb 3 10:26:38 CET 2023
Add support for encryption, decryption and signinig with
non-zero key saving backward compatibility.
Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
arch/arm/include/asm/arch-tegra/crypto.h | 47 ++++++++++++++++++
arch/arm/mach-tegra/crypto.c | 63 +++++++++++++++++-------
arch/arm/mach-tegra/crypto.h | 19 -------
3 files changed, 91 insertions(+), 38 deletions(-)
create mode 100644 arch/arm/include/asm/arch-tegra/crypto.h
delete mode 100644 arch/arm/mach-tegra/crypto.h
diff --git a/arch/arm/include/asm/arch-tegra/crypto.h b/arch/arm/include/asm/arch-tegra/crypto.h
new file mode 100644
index 0000000000..7646163b97
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra/crypto.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
+ */
+
+#ifndef _CRYPTO_H_
+#define _CRYPTO_H_
+
+/**
+ * Sign a block of data
+ *
+ * \param source Source data
+ * \param length Size of source data
+ * \param signature Destination address for signature, AES_KEY_LENGTH bytes
+ */
+int sign_data_block(u8 *source, unsigned int length, u8 *signature);
+
+/**
+ * Sign an encrypted block of data
+ *
+ * \param source Source data
+ * \param length Size of source data
+ * \param signature Destination address for signature, AES_KEY_LENGTH bytes
+ * \param key AES128 encryption key
+ */
+int sign_enc_data_block(u8 *source, unsigned int length, u8 *signature, u8 *key);
+
+/**
+ * Encrypt a block of data
+ *
+ * \param source Source data
+ * \param length Size of source data
+ * \param key AES128 encryption key
+ */
+int encrypt_data_block(u8 *source, unsigned int length, u8 *key);
+
+/**
+ * Decrypt a block of data
+ *
+ * \param source Source data
+ * \param length Size of source data
+ * \param key AES128 encryption key
+ */
+int decrypt_data_block(u8 *source, unsigned int length, u8 *key);
+
+#endif /* #ifndef _CRYPTO_H_ */
diff --git a/arch/arm/mach-tegra/crypto.c b/arch/arm/mach-tegra/crypto.c
index 1efaa5c3ec..893da35e0b 100644
--- a/arch/arm/mach-tegra/crypto.c
+++ b/arch/arm/mach-tegra/crypto.c
@@ -7,7 +7,7 @@
#include <common.h>
#include <log.h>
#include <linux/errno.h>
-#include "crypto.h"
+#include <asm/arch-tegra/crypto.h>
#include "uboot_aes.h"
static u8 zero_key[16];
@@ -17,6 +17,7 @@ static u8 zero_key[16];
enum security_op {
SECURITY_SIGN = 1 << 0, /* Sign the data */
SECURITY_ENCRYPT = 1 << 1, /* Encrypt the data */
+ SECURITY_DECRYPT = 1 << 2, /* Dectypt the data */
};
/**
@@ -54,7 +55,7 @@ static void sign_object(u8 *key, u8 *key_schedule, u8 *src, u8 *dst,
u8 left[AES128_KEY_LENGTH];
u8 k1[AES128_KEY_LENGTH];
u8 *cbc_chain_data;
- unsigned i;
+ unsigned int i;
cbc_chain_data = zero_key; /* Convenient array of 0's for IV */
@@ -92,7 +93,7 @@ static void sign_object(u8 *key, u8 *key_schedule, u8 *src, u8 *dst,
}
/**
- * Encrypt and sign a block of data (depending on security mode).
+ * Decrypt, encrypt or sign a block of data (depending on security mode).
*
* \param key Input AES key, length AES128_KEY_LENGTH
* \param oper Security operations mask to perform (enum security_op)
@@ -100,44 +101,68 @@ static void sign_object(u8 *key, u8 *key_schedule, u8 *src, u8 *dst,
* \param length Size of source data
* \param sig_dst Destination address for signature, AES128_KEY_LENGTH bytes
*/
-static int encrypt_and_sign(u8 *key, enum security_op oper, u8 *src,
- u32 length, u8 *sig_dst)
+static int tegra_crypto_core(u8 *key, enum security_op oper, u8 *src,
+ u32 length, u8 *sig_dst)
{
u32 num_aes_blocks;
u8 key_schedule[AES128_EXPAND_KEY_LENGTH];
u8 iv[AES128_KEY_LENGTH] = {0};
- debug("encrypt_and_sign: length = %d\n", length);
+ debug("%s: length = %d\n", __func__, length);
- /*
- * The only need for a key is for signing/checksum purposes, so
- * if not encrypting, expand a key of 0s.
- */
- aes_expand_key(oper & SECURITY_ENCRYPT ? key : zero_key,
- AES128_KEY_LENGTH, key_schedule);
+ aes_expand_key(key, AES128_KEY_LENGTH, key_schedule);
num_aes_blocks = (length + AES128_KEY_LENGTH - 1) / AES128_KEY_LENGTH;
+ if (oper & SECURITY_DECRYPT) {
+ /* Perform this in place, resulting in src being decrypted. */
+ debug("%s: begin decryption\n", __func__);
+ aes_cbc_decrypt_blocks(AES128_KEY_LENGTH, key_schedule, iv, src,
+ src, num_aes_blocks);
+ debug("%s: end decryption\n", __func__);
+ }
+
if (oper & SECURITY_ENCRYPT) {
/* Perform this in place, resulting in src being encrypted. */
- debug("encrypt_and_sign: begin encryption\n");
+ debug("%s: begin encryption\n", __func__);
aes_cbc_encrypt_blocks(AES128_KEY_LENGTH, key_schedule, iv, src,
src, num_aes_blocks);
- debug("encrypt_and_sign: end encryption\n");
+ debug("%s: end encryption\n", __func__);
}
if (oper & SECURITY_SIGN) {
/* encrypt the data, overwriting the result in signature. */
- debug("encrypt_and_sign: begin signing\n");
+ debug("%s: begin signing\n", __func__);
sign_object(key, key_schedule, src, sig_dst, num_aes_blocks);
- debug("encrypt_and_sign: end signing\n");
+ debug("%s: end signing\n", __func__);
}
return 0;
}
-int sign_data_block(u8 *source, unsigned length, u8 *signature)
+/**
+ * Tegra crypto group
+ */
+int sign_data_block(u8 *source, unsigned int length, u8 *signature)
+{
+ return tegra_crypto_core(zero_key, SECURITY_SIGN, source,
+ length, signature);
+}
+
+int sign_enc_data_block(u8 *source, unsigned int length, u8 *signature, u8 *key)
+{
+ return tegra_crypto_core(key, SECURITY_SIGN, source,
+ length, signature);
+}
+
+int encrypt_data_block(u8 *source, unsigned int length, u8 *key)
+{
+ return tegra_crypto_core(key, SECURITY_ENCRYPT, source,
+ length, NULL);
+}
+
+int decrypt_data_block(u8 *source, unsigned int length, u8 *key)
{
- return encrypt_and_sign(zero_key, SECURITY_SIGN, source,
- length, signature);
+ return tegra_crypto_core(key, SECURITY_DECRYPT, source,
+ length, NULL);
}
diff --git a/arch/arm/mach-tegra/crypto.h b/arch/arm/mach-tegra/crypto.h
deleted file mode 100644
index a773d03fc7..0000000000
--- a/arch/arm/mach-tegra/crypto.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
-/*
- * Copyright (c) 2011 The Chromium OS Authors.
- * (C) Copyright 2010 - 2011 NVIDIA Corporation <www.nvidia.com>
- */
-
-#ifndef _CRYPTO_H_
-#define _CRYPTO_H_
-
-/**
- * Sign a block of data
- *
- * \param source Source data
- * \param length Size of source data
- * \param signature Destination address for signature, AES_KEY_LENGTH bytes
- */
-int sign_data_block(u8 *source, unsigned length, u8 *signature);
-
-#endif /* #ifndef _CRYPTO_H_ */
--
2.37.2
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