staging: ks7010: add driver from Nanonote extra-repository

See the TODO for details where this driver came from. Only a few minor
changes were made to make the driver suitable for staging:

* updated Kconfig help text and dependencies
* added TODO
* removed two __DATE__ and __TIME__ printouts to allow reproducible builds
* added to staging main Kconfig + Makefile

Tested on a Renesas Salvator-X board with a Spectec SDW-823 card. I
could connect to a WPA-protected network.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 143 insertions, 0 deletions

diff --git a/drivers/staging/ks7010/michael_mic.c b/drivers/staging/ks7010/michael_mic.c
new file mode 100644
index 000000000000..ec8769a97442
--- /dev/null
+++ b/drivers/staging/ks7010/michael_mic.c
@@ -0,0 +1,143 @@
+/*
+ *   Driver for KeyStream wireless LAN
+ *
+ *   michael_mic.c
+ *   $Id: michael_mic.c 991 2009-09-14 01:38:58Z sekine $
+ *
+ *   Copyright (C) 2005-2008 KeyStream Corp.
+ *   Copyright (C) 2009 Renesas Technology Corp.
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it undr the terms of the GNU General Public License version 2 as
+ *   published by the Free Sotware Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include "michael_mic.h"
+
+// Rotation functions on 32 bit values
+#define ROL32( A, n ) 	( ((A) << (n)) | ( ((A)>>(32-(n))) & ( (1UL << (n)) - 1 ) ) )
+#define ROR32( A, n ) 	ROL32( (A), 32-(n) )
+// Convert from Byte[] to UInt32 in a portable way
+#define getUInt32( A, B ) 	(uint32_t)(A[B+0] << 0) + (A[B+1] << 8) + (A[B+2] << 16) + (A[B+3] << 24)
+
+// Convert from UInt32 to Byte[] in a portable way
+#define putUInt32( A, B, C ) 	A[B+0] = (uint8_t) (C & 0xff);		\
+				A[B+1] = (uint8_t) ((C>>8) & 0xff);	\
+				A[B+2] = (uint8_t) ((C>>16) & 0xff);	\
+				A[B+3] = (uint8_t) ((C>>24) & 0xff)
+
+// Reset the state to the empty message.
+#define MichaelClear( A ) 	A->L = A->K0; \
+				A->R = A->K1; \
+				A->nBytesInM = 0;
+
+static
+void MichaelInitializeFunction( struct michel_mic_t *Mic, uint8_t *key )
+{
+	// Set the key
+	Mic->K0 = getUInt32( key , 0 );
+	Mic->K1 = getUInt32( key , 4 );
+
+	//clear();
+	MichaelClear(Mic);
+}
+
+#define MichaelBlockFunction(L, R)				\
+do{								\
+	R ^= ROL32( L, 17 );					\
+	L += R;							\
+	R ^= ((L & 0xff00ff00) >> 8) | ((L & 0x00ff00ff) << 8);	\
+	L += R;							\
+	R ^= ROL32( L, 3 );					\
+	L += R;							\
+	R ^= ROR32( L, 2 );					\
+	L += R;							\
+}while(0)
+
+
+static
+void MichaelAppend( struct michel_mic_t *Mic, uint8_t *src, int nBytes )
+{
+	int addlen ;
+	if (Mic->nBytesInM) {
+		addlen = 4 - Mic->nBytesInM;
+		if (addlen > nBytes)
+			addlen = nBytes;
+		memcpy(&Mic->M[Mic->nBytesInM], src, addlen);
+		Mic->nBytesInM += addlen;
+		src += addlen;
+		nBytes -= addlen;
+
+		if (Mic->nBytesInM < 4)
+			return;
+
+		Mic->L ^= getUInt32(Mic->M,0);
+		MichaelBlockFunction(Mic->L, Mic->R);
+		Mic->nBytesInM = 0;
+	}
+
+	while(nBytes >= 4){
+		Mic->L ^= getUInt32(src,0);
+		MichaelBlockFunction(Mic->L, Mic->R);
+		src += 4;
+		nBytes -= 4;
+	}
+
+	if (nBytes > 0) {
+		Mic->nBytesInM = nBytes;
+		memcpy(Mic->M, src, nBytes);
+	}
+}
+
+static
+void MichaelGetMIC( struct michel_mic_t *Mic, uint8_t *dst )
+{
+	uint8_t *data = Mic->M;
+	switch (Mic->nBytesInM) {
+	case 0:
+		Mic->L ^= 0x5a;
+		break;
+	case 1:
+		Mic->L ^= data[0] | 0x5a00;
+		break;
+	case 2:
+		Mic->L ^= data[0] | (data[1] << 8) | 0x5a0000;
+		break;
+	case 3:
+		Mic->L ^= data[0] | (data[1] << 8) | (data[2] << 16) |
+			0x5a000000;
+		break;
+	}
+	MichaelBlockFunction(Mic->L, Mic->R);
+	MichaelBlockFunction(Mic->L, Mic->R);
+	// The appendByte function has already computed the result.
+	putUInt32( dst, 0, Mic->L );
+	putUInt32( dst, 4, Mic->R );
+
+	// Reset to the empty message.
+	MichaelClear(Mic);
+}
+
+void MichaelMICFunction( struct michel_mic_t *Mic, uint8_t *Key,
+			 uint8_t *Data, int Len, uint8_t priority,
+			 uint8_t *Result )
+{
+	uint8_t pad_data[4] = {priority,0,0,0};
+	// Compute the MIC value
+	/*
+	 * IEEE802.11i  page 47
+	 * Figure 43g TKIP MIC processing format
+	 * +--+--+--------+--+----+--+--+--+--+--+--+--+--+
+	 * |6 |6 |1       |3 |M   |1 |1 |1 |1 |1 |1 |1 |1 | Octet
+	 * +--+--+--------+--+----+--+--+--+--+--+--+--+--+
+	 * |DA|SA|Priority|0 |Data|M0|M1|M2|M3|M4|M5|M6|M7|
+	 * +--+--+--------+--+----+--+--+--+--+--+--+--+--+
+	 */
+	MichaelInitializeFunction( Mic, Key ) ;
+	MichaelAppend( Mic, (uint8_t*)Data, 12 ); /* |DA|SA| */
+	MichaelAppend( Mic, pad_data, 4 ); /* |Priority|0|0|0| */
+	MichaelAppend( Mic, (uint8_t*)(Data+12), Len -12 ); /* |Data| */
+	MichaelGetMIC( Mic, Result ) ;
+}