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-rw-r--r--include/rc4.h21
-rw-r--r--lib/Makefile1
-rw-r--r--lib/rc4.c49
3 files changed, 71 insertions, 0 deletions
diff --git a/include/rc4.h b/include/rc4.h
new file mode 100644
index 0000000000..ea409c2f3e
--- /dev/null
+++ b/include/rc4.h
@@ -0,0 +1,21 @@
+/*
+ * (C) Copyright 2015 Google, Inc
+ *
+ * (C) Copyright 2008-2014 Rockchip Electronics
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __RC4_H
+#define __RC4_H
+
+/**
+ * rc4_encode() - encode a buf with the RC4 cipher
+ *
+ * @buf: Buffer to encode (it is overwrite in the process
+ * @len: Length of buffer in bytes
+ * @key: 16-byte key to use
+ */
+void rc4_encode(unsigned char *buf, unsigned int len, unsigned char key[16]);
+
+#endif
diff --git a/lib/Makefile b/lib/Makefile
index 1139f9b755..fd106b91c8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_MD5) += md5.o
obj-y += net_utils.o
obj-$(CONFIG_PHYSMEM) += physmem.o
obj-y += qsort.o
+obj-y += rc4.o
obj-$(CONFIG_SHA1) += sha1.o
obj-$(CONFIG_SUPPORT_EMMC_RPMB) += sha256.o
obj-$(CONFIG_SHA256) += sha256.o
diff --git a/lib/rc4.c b/lib/rc4.c
new file mode 100644
index 0000000000..89d15f3c82
--- /dev/null
+++ b/lib/rc4.c
@@ -0,0 +1,49 @@
+/*
+ * (C) Copyright 2015 Google, Inc
+ *
+ * (C) Copyright 2008-2014 Rockchip Electronics
+ *
+ * Rivest Cipher 4 (RC4) implementation
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef USE_HOSTCC
+#include <common.h>
+#endif
+#include <rc4.h>
+
+void rc4_encode(unsigned char *buf, unsigned int len, unsigned char key[16])
+{
+ unsigned char s[256], k[256], temp;
+ unsigned short i, j, t;
+ int ptr;
+
+ j = 0;
+ for (i = 0; i < 256; i++) {
+ s[i] = (unsigned char)i;
+ j &= 0x0f;
+ k[i] = key[j];
+ j++;
+ }
+
+ j = 0;
+ for (i = 0; i < 256; i++) {
+ j = (j + s[i] + k[i]) % 256;
+ temp = s[i];
+ s[i] = s[j];
+ s[j] = temp;
+ }
+
+ i = 0;
+ j = 0;
+ for (ptr = 0; ptr < len; ptr++) {
+ i = (i + 1) % 256;
+ j = (j + s[i]) % 256;
+ temp = s[i];
+ s[i] = s[j];
+ s[j] = temp;
+ t = (s[i] + (s[j] % 256)) % 256;
+ buf[ptr] = buf[ptr] ^ s[t];
+ }
+}
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