[PATCH 4/7] add sha256 support

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 lib/Kconfig  |    3 +
 lib/Makefile |    1 +
 lib/sha256.c |  319 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 323 insertions(+), 0 deletions(-)
 create mode 100644 lib/sha256.c

diff --git a/lib/Kconfig b/lib/Kconfig
index 650e86c..c9eb38f 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -22,6 +22,9 @@ config MD5
 config SHA1
 	bool "SHA1"
 
+config SHA256
+	bool "SHA256"
+
 endif
 
 config GENERIC_FIND_NEXT_BIT
diff --git a/lib/Makefile b/lib/Makefile
index 6f79d03..0c62917 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -36,3 +36,4 @@ obj-$(CONFIG_LZO_DECOMPRESS)		+= decompress_unlzo.o
 obj-$(CONFIG_PROCESS_ESCAPE_SEQUENCE)	+= process_escape_sequence.o
 obj-$(CONFIG_MD5)	+= md5.o
 obj-$(CONFIG_SHA1)	+= sha1.o
+obj-$(CONFIG_SHA256)	+= sha256.o
diff --git a/lib/sha256.c b/lib/sha256.c
new file mode 100644
index 0000000..78064da
--- /dev/null
+++ b/lib/sha256.c
@@ -0,0 +1,319 @@
+/*
+ * FIPS-180-2 compliant SHA-256 implementation
+ *
+ * Copyright (C) 2001-2003  Christophe Devine
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <common.h>
+#include <digest.h>
+#include <init.h>
+#include <linux/string.h>
+
+#define SHA256_SUM_LEN	32
+
+typedef struct {
+	uint32_t total[2];
+	uint32_t state[8];
+	uint8_t buffer[64];
+} sha256_context;
+
+/*
+ * 32-bit integer manipulation macros (big endian)
+ */
+#ifndef GET_UINT32_BE
+#define GET_UINT32_BE(n,b,i) {				\
+	(n) = ( (unsigned long) (b)[(i)    ] << 24 )	\
+	    | ( (unsigned long) (b)[(i) + 1] << 16 )	\
+	    | ( (unsigned long) (b)[(i) + 2] <<  8 )	\
+	    | ( (unsigned long) (b)[(i) + 3]       );	\
+}
+#endif
+#ifndef PUT_UINT32_BE
+#define PUT_UINT32_BE(n,b,i) {				\
+	(b)[(i)    ] = (unsigned char) ( (n) >> 24 );	\
+	(b)[(i) + 1] = (unsigned char) ( (n) >> 16 );	\
+	(b)[(i) + 2] = (unsigned char) ( (n) >>  8 );	\
+	(b)[(i) + 3] = (unsigned char) ( (n)       );	\
+}
+#endif
+
+static void sha256_starts(sha256_context * ctx)
+{
+	ctx->total[0] = 0;
+	ctx->total[1] = 0;
+
+	ctx->state[0] = 0x6A09E667;
+	ctx->state[1] = 0xBB67AE85;
+	ctx->state[2] = 0x3C6EF372;
+	ctx->state[3] = 0xA54FF53A;
+	ctx->state[4] = 0x510E527F;
+	ctx->state[5] = 0x9B05688C;
+	ctx->state[6] = 0x1F83D9AB;
+	ctx->state[7] = 0x5BE0CD19;
+}
+
+static void sha256_process(sha256_context * ctx, uint8_t data[64])
+{
+	uint32_t temp1, temp2;
+	uint32_t W[64];
+	uint32_t A, B, C, D, E, F, G, H;
+
+	GET_UINT32_BE(W[0], data, 0);
+	GET_UINT32_BE(W[1], data, 4);
+	GET_UINT32_BE(W[2], data, 8);
+	GET_UINT32_BE(W[3], data, 12);
+	GET_UINT32_BE(W[4], data, 16);
+	GET_UINT32_BE(W[5], data, 20);
+	GET_UINT32_BE(W[6], data, 24);
+	GET_UINT32_BE(W[7], data, 28);
+	GET_UINT32_BE(W[8], data, 32);
+	GET_UINT32_BE(W[9], data, 36);
+	GET_UINT32_BE(W[10], data, 40);
+	GET_UINT32_BE(W[11], data, 44);
+	GET_UINT32_BE(W[12], data, 48);
+	GET_UINT32_BE(W[13], data, 52);
+	GET_UINT32_BE(W[14], data, 56);
+	GET_UINT32_BE(W[15], data, 60);
+
+#define SHR(x,n) ((x & 0xFFFFFFFF) >> n)
+#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))
+
+#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3))
+#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10))
+
+#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
+#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))
+
+#define F0(x,y,z) ((x & y) | (z & (x | y)))
+#define F1(x,y,z) (z ^ (x & (y ^ z)))
+
+#define R(t)					\
+(						\
+	W[t] = S1(W[t - 2]) + W[t - 7] +	\
+		S0(W[t - 15]) + W[t - 16]	\
+)
+
+#define P(a,b,c,d,e,f,g,h,x,K) {		\
+	temp1 = h + S3(e) + F1(e,f,g) + K + x;	\
+	temp2 = S2(a) + F0(a,b,c);		\
+	d += temp1; h = temp1 + temp2;		\
+}
+
+	A = ctx->state[0];
+	B = ctx->state[1];
+	C = ctx->state[2];
+	D = ctx->state[3];
+	E = ctx->state[4];
+	F = ctx->state[5];
+	G = ctx->state[6];
+	H = ctx->state[7];
+
+	P(A, B, C, D, E, F, G, H, W[0], 0x428A2F98);
+	P(H, A, B, C, D, E, F, G, W[1], 0x71374491);
+	P(G, H, A, B, C, D, E, F, W[2], 0xB5C0FBCF);
+	P(F, G, H, A, B, C, D, E, W[3], 0xE9B5DBA5);
+	P(E, F, G, H, A, B, C, D, W[4], 0x3956C25B);
+	P(D, E, F, G, H, A, B, C, W[5], 0x59F111F1);
+	P(C, D, E, F, G, H, A, B, W[6], 0x923F82A4);
+	P(B, C, D, E, F, G, H, A, W[7], 0xAB1C5ED5);
+	P(A, B, C, D, E, F, G, H, W[8], 0xD807AA98);
+	P(H, A, B, C, D, E, F, G, W[9], 0x12835B01);
+	P(G, H, A, B, C, D, E, F, W[10], 0x243185BE);
+	P(F, G, H, A, B, C, D, E, W[11], 0x550C7DC3);
+	P(E, F, G, H, A, B, C, D, W[12], 0x72BE5D74);
+	P(D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE);
+	P(C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7);
+	P(B, C, D, E, F, G, H, A, W[15], 0xC19BF174);
+	P(A, B, C, D, E, F, G, H, R(16), 0xE49B69C1);
+	P(H, A, B, C, D, E, F, G, R(17), 0xEFBE4786);
+	P(G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6);
+	P(F, G, H, A, B, C, D, E, R(19), 0x240CA1CC);
+	P(E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F);
+	P(D, E, F, G, H, A, B, C, R(21), 0x4A7484AA);
+	P(C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC);
+	P(B, C, D, E, F, G, H, A, R(23), 0x76F988DA);
+	P(A, B, C, D, E, F, G, H, R(24), 0x983E5152);
+	P(H, A, B, C, D, E, F, G, R(25), 0xA831C66D);
+	P(G, H, A, B, C, D, E, F, R(26), 0xB00327C8);
+	P(F, G, H, A, B, C, D, E, R(27), 0xBF597FC7);
+	P(E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3);
+	P(D, E, F, G, H, A, B, C, R(29), 0xD5A79147);
+	P(C, D, E, F, G, H, A, B, R(30), 0x06CA6351);
+	P(B, C, D, E, F, G, H, A, R(31), 0x14292967);
+	P(A, B, C, D, E, F, G, H, R(32), 0x27B70A85);
+	P(H, A, B, C, D, E, F, G, R(33), 0x2E1B2138);
+	P(G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC);
+	P(F, G, H, A, B, C, D, E, R(35), 0x53380D13);
+	P(E, F, G, H, A, B, C, D, R(36), 0x650A7354);
+	P(D, E, F, G, H, A, B, C, R(37), 0x766A0ABB);
+	P(C, D, E, F, G, H, A, B, R(38), 0x81C2C92E);
+	P(B, C, D, E, F, G, H, A, R(39), 0x92722C85);
+	P(A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1);
+	P(H, A, B, C, D, E, F, G, R(41), 0xA81A664B);
+	P(G, H, A, B, C, D, E, F, R(42), 0xC24B8B70);
+	P(F, G, H, A, B, C, D, E, R(43), 0xC76C51A3);
+	P(E, F, G, H, A, B, C, D, R(44), 0xD192E819);
+	P(D, E, F, G, H, A, B, C, R(45), 0xD6990624);
+	P(C, D, E, F, G, H, A, B, R(46), 0xF40E3585);
+	P(B, C, D, E, F, G, H, A, R(47), 0x106AA070);
+	P(A, B, C, D, E, F, G, H, R(48), 0x19A4C116);
+	P(H, A, B, C, D, E, F, G, R(49), 0x1E376C08);
+	P(G, H, A, B, C, D, E, F, R(50), 0x2748774C);
+	P(F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5);
+	P(E, F, G, H, A, B, C, D, R(52), 0x391C0CB3);
+	P(D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A);
+	P(C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F);
+	P(B, C, D, E, F, G, H, A, R(55), 0x682E6FF3);
+	P(A, B, C, D, E, F, G, H, R(56), 0x748F82EE);
+	P(H, A, B, C, D, E, F, G, R(57), 0x78A5636F);
+	P(G, H, A, B, C, D, E, F, R(58), 0x84C87814);
+	P(F, G, H, A, B, C, D, E, R(59), 0x8CC70208);
+	P(E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA);
+	P(D, E, F, G, H, A, B, C, R(61), 0xA4506CEB);
+	P(C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7);
+	P(B, C, D, E, F, G, H, A, R(63), 0xC67178F2);
+
+	ctx->state[0] += A;
+	ctx->state[1] += B;
+	ctx->state[2] += C;
+	ctx->state[3] += D;
+	ctx->state[4] += E;
+	ctx->state[5] += F;
+	ctx->state[6] += G;
+	ctx->state[7] += H;
+}
+
+static void sha256_update(sha256_context * ctx, uint8_t * input, uint32_t length)
+{
+	uint32_t left, fill;
+
+	if (!length)
+		return;
+
+	left = ctx->total[0] & 0x3F;
+	fill = 64 - left;
+
+	ctx->total[0] += length;
+	ctx->total[0] &= 0xFFFFFFFF;
+
+	if (ctx->total[0] < length)
+		ctx->total[1]++;
+
+	if (left && length >= fill) {
+		memcpy((void *) (ctx->buffer + left), (void *) input, fill);
+		sha256_process(ctx, ctx->buffer);
+		length -= fill;
+		input += fill;
+		left = 0;
+	}
+
+	while (length >= 64) {
+		sha256_process(ctx, input);
+		length -= 64;
+		input += 64;
+	}
+
+	if (length)
+		memcpy((void *) (ctx->buffer + left), (void *) input, length);
+}
+
+static uint8_t sha256_padding[64] = {
+	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+static void sha256_finish(sha256_context * ctx, uint8_t digest[32])
+{
+	uint32_t last, padn;
+	uint32_t high, low;
+	uint8_t msglen[8];
+
+	high = ((ctx->total[0] >> 29)
+		| (ctx->total[1] << 3));
+	low = (ctx->total[0] << 3);
+
+	PUT_UINT32_BE(high, msglen, 0);
+	PUT_UINT32_BE(low, msglen, 4);
+
+	last = ctx->total[0] & 0x3F;
+	padn = (last < 56) ? (56 - last) : (120 - last);
+
+	sha256_update(ctx, sha256_padding, padn);
+	sha256_update(ctx, msglen, 8);
+
+	PUT_UINT32_BE(ctx->state[0], digest, 0);
+	PUT_UINT32_BE(ctx->state[1], digest, 4);
+	PUT_UINT32_BE(ctx->state[2], digest, 8);
+	PUT_UINT32_BE(ctx->state[3], digest, 12);
+	PUT_UINT32_BE(ctx->state[4], digest, 16);
+	PUT_UINT32_BE(ctx->state[5], digest, 20);
+	PUT_UINT32_BE(ctx->state[6], digest, 24);
+	PUT_UINT32_BE(ctx->state[7], digest, 28);
+}
+
+struct sha256 {
+	sha256_context context;
+	struct digest d;
+};
+
+static int digest_sha256_init(struct digest *d)
+{
+	struct sha256 *m = container_of(d, struct sha256, d);
+
+	sha256_starts(&m->context);
+
+	return 0;
+}
+
+static int digest_sha256_update(struct digest *d, const void *data,
+				unsigned long len)
+{
+	struct sha256 *m = container_of(d, struct sha256, d);
+
+	sha256_update(&m->context, (uint8_t *)data, len);
+
+	return 0;
+}
+
+static int digest_sha256_final(struct digest *d, unsigned char *md)
+{
+	struct sha256 *m = container_of(d, struct sha256, d);
+
+	sha256_finish(&m->context, md);
+
+	return 0;
+}
+
+static struct sha256 m = {
+	.d = {
+		.name = "sha256",
+		.init = digest_sha256_init,
+		.update = digest_sha256_update,
+		.final = digest_sha256_final,
+		.length = SHA256_SUM_LEN,
+	}
+};
+
+static int sha256_digest_register(void)
+{
+	digest_register(&m.d);
+
+	return 0;
+}
+device_initcall(sha256_digest_register);
-- 
1.7.1


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