add SHA256 support

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Francesco Albanese <Francesco.Albanese@swisscom.com>

diff --git a/include/sha256.h b/include/sha256.h
new file mode 100755 (executable)
index 0000000..e38ea89
--- /dev/null
+++ b/include/sha256.h
@@ -0,0 +1,16 @@
+#ifndef _SHA256_H
+#define _SHA256_H
+
+#define SHA256_SUM_LEN 32
+
+typedef struct {
+       uint32_t total[2];
+       uint32_t state[8];
+       uint8_t buffer[64];
+} sha256_context;
+
+void sha256_starts(sha256_context * ctx);
+void sha256_update(sha256_context * ctx, uint8_t * input, uint32_t length);
+void sha256_finish(sha256_context * ctx, uint8_t digest[SHA256_SUM_LEN]);
+
+#endif /* _SHA256_H */

diff --git a/lib_generic/Makefile b/lib_generic/Makefile
index dca3a6cbdc6122900588f6521d27bebe2e0cbd23..4f6ce73ab3c4431ffc564ec6785acc216edef5bf 100644 (file)
--- a/lib_generic/Makefile
+++ b/lib_generic/Makefile
@@ -38,6 +38,7 @@ COBJS-y += lmb.o
 COBJS-y += ldiv.o
 COBJS-$(CONFIG_MD5) += md5.o
 COBJS-y += sha1.o
+COBJS-$(CONFIG_SHA256) += sha256.o
 COBJS-y += string.o
 COBJS-y += vsprintf.o
 COBJS-y += zlib.o

diff --git a/lib_generic/sha256.c b/lib_generic/sha256.c
new file mode 100644 (file)
index 0000000..deb63a4
--- /dev/null
+++ b/lib_generic/sha256.c
@@ -0,0 +1,262 @@
+/*
+ * 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
+ */
+
+#ifndef USE_HOSTCC
+#include <common.h>
+#endif /* USE_HOSTCC */
+#include <watchdog.h>
+#include <linux/string.h>
+#include <sha256.h>
+
+/*
+ * 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
+
+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;
+}
+
+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;
+}
+
+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
+};
+
+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);
+}