[CRYPTO]: Add in crypto/sha256.c

crypto/sha256.c

+/*
+ * Cryptographic API.
+ *
+ * SHA-256, as specified in
+ * http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf
+ *
+ * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
+ *
+ * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
+ * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ *
+ * 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.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/crypto.h>
+#include <asm/scatterlist.h>
+#include <asm/byteorder.h>
+
+#define SHA256_DIGEST_SIZE	32
+#define SHA256_HMAC_BLOCK_SIZE	64
+
+struct sha256_ctx {
+	u32 count[2];
+	u32 state[8];
+	u8 buf[128];
+};
+
+#define Ch(x,y,z)   ((x & y) ^ (~x & z))
+#define Maj(x,y,z)  ((x & y) ^ ( x & z) ^ (y & z))
+#define RORu32(x,y) ( ((x) >> (y)) | ((x) << (32-(y))) )
+#define e0(x)       (RORu32(x, 2) ^ RORu32(x,13) ^ RORu32(x,22))
+#define e1(x)       (RORu32(x, 6) ^ RORu32(x,11) ^ RORu32(x,25))
+#define s0(x)       (RORu32(x, 7) ^ RORu32(x,18) ^ (x >> 3))
+#define s1(x)       (RORu32(x,17) ^ RORu32(x,19) ^ (x >> 10))
+
+#define H0         0x6a09e667
+#define H1         0xbb67ae85
+#define H2         0x3c6ef372
+#define H3         0xa54ff53a
+#define H4         0x510e527f
+#define H5         0x9b05688c
+#define H6         0x1f83d9ab
+#define H7         0x5be0cd19
+
+#define LOAD_OP(I)\
+ {\
+  t1  = input[(4*I)  ] & 0xff; t1<<=8;\
+  t1 |= input[(4*I)+1] & 0xff; t1<<=8;\
+  t1 |= input[(4*I)+2] & 0xff; t1<<=8;\
+  t1 |= input[(4*I)+3] & 0xff;\
+  W[I] = t1;\
+ }
+
+#define BLEND_OP(I) W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
+
+static void sha256_transform(u32 *state, const u8 *input)
+{
+	u32 a, b, c, d, e, f, g, h, t1, t2;
+	u32 W[64];
+
+	/* load the input */
+	LOAD_OP( 0);  LOAD_OP( 1);  LOAD_OP( 2);  LOAD_OP( 3);
+	LOAD_OP( 4);  LOAD_OP( 5);  LOAD_OP( 6);  LOAD_OP( 7);
+	LOAD_OP( 8);  LOAD_OP( 9);  LOAD_OP(10);  LOAD_OP(11);
+	LOAD_OP(12);  LOAD_OP(13);  LOAD_OP(14);  LOAD_OP(15);
+
+	/* now blend */
+	BLEND_OP(16);  BLEND_OP(17);  BLEND_OP(18);  BLEND_OP(19);
+	BLEND_OP(20);  BLEND_OP(21);  BLEND_OP(22);  BLEND_OP(23);
+	BLEND_OP(24);  BLEND_OP(25);  BLEND_OP(26);  BLEND_OP(27);
+	BLEND_OP(28);  BLEND_OP(29);  BLEND_OP(30);  BLEND_OP(31);
+	BLEND_OP(32);  BLEND_OP(33);  BLEND_OP(34);  BLEND_OP(35);
+	BLEND_OP(36);  BLEND_OP(37);  BLEND_OP(38);  BLEND_OP(39);
+	BLEND_OP(40);  BLEND_OP(41);  BLEND_OP(42);  BLEND_OP(43);
+	BLEND_OP(44);  BLEND_OP(45);  BLEND_OP(46);  BLEND_OP(47);
+	BLEND_OP(48);  BLEND_OP(49);  BLEND_OP(50);  BLEND_OP(51);
+	BLEND_OP(52);  BLEND_OP(53);  BLEND_OP(54);  BLEND_OP(55);
+	BLEND_OP(56);  BLEND_OP(57);  BLEND_OP(58);  BLEND_OP(59);
+	BLEND_OP(60);  BLEND_OP(61);  BLEND_OP(62);  BLEND_OP(63);
+    
+	/* load the state into our registers */
+	a=state[0];  b=state[1];  c=state[2];  d=state[3];
+	e=state[4];  f=state[5];  g=state[6];  h=state[7];
+
+	/* now iterate */
+	t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
+	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
+	t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
+	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
+	t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
+	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
+	t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
+	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
+	t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
+	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
+	t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
+	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
+	t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
+	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
+	t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
+	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
+
+	t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
+	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
+	t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
+	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
+	t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
+	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
+	t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
+	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
+	t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
+	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
+	t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
+	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
+	t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
+	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
+	t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
+	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
+
+	t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
+	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
+	t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
+	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
+	t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
+	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
+	t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
+	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
+	t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
+	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
+	t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
+	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
+	t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
+	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
+	t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
+	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
+
+	t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
+	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
+	t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
+	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
+	t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
+	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
+	t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
+	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
+	t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
+	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
+	t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
+	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
+	t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
+	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
+	t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
+	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
+
+	t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
+	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
+	t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
+	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
+	t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
+	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
+	t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
+	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
+	t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
+	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
+	t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
+	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
+	t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
+	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
+	t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
+	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
+
+	t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
+	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
+	t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
+	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
+	t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
+	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
+	t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
+	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
+	t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
+	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
+	t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
+	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
+	t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
+	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
+	t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
+	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
+
+	t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
+	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
+	t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
+	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
+	t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
+	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
+	t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
+	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
+	t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
+	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
+	t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
+	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
+	t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
+	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
+	t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
+	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
+
+	t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
+	t2 = e0(a) + Maj(a,b,c);    d+=t1;    h=t1+t2;
+	t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
+	t2 = e0(h) + Maj(h,a,b);    c+=t1;    g=t1+t2;
+	t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
+	t2 = e0(g) + Maj(g,h,a);    b+=t1;    f=t1+t2;
+	t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
+	t2 = e0(f) + Maj(f,g,h);    a+=t1;    e=t1+t2;
+	t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
+	t2 = e0(e) + Maj(e,f,g);    h+=t1;    d=t1+t2;
+	t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
+	t2 = e0(d) + Maj(d,e,f);    g+=t1;    c=t1+t2;
+	t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
+	t2 = e0(c) + Maj(c,d,e);    f+=t1;    b=t1+t2;
+	t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
+	t2 = e0(b) + Maj(b,c,d);    e+=t1;    a=t1+t2;
+
+	state[0] += a; state[1] += b; state[2] += c; state[3] += d;
+	state[4] += e; state[5] += f; state[6] += g; state[7] += h;
+
+	/* clear any sensitive info... */
+	a = b = c = d = e = f = g = h = t1 = t2 = 0;
+	memset(W, 0, 64 * sizeof(u32));
+}
+
+static void sha256_init(void *ctx)
+{
+	struct sha256_ctx *sctx = ctx;
+	sctx->state[0] = H0;
+	sctx->state[1] = H1;
+	sctx->state[2] = H2;
+	sctx->state[3] = H3;
+	sctx->state[4] = H4;
+	sctx->state[5] = H5;
+	sctx->state[6] = H6;
+	sctx->state[7] = H7;
+	sctx->count[0] = sctx->count[1] = 0;
+	memset(sctx->buf, 0, sizeof(sctx->buf));
+}
+
+static void sha256_update(void *ctx, const u8 *data, unsigned int len)
+{
+	struct sha256_ctx *sctx = ctx;
+	unsigned int i, index, part_len;
+
+	/* Compute number of bytes mod 128 */
+	index = (unsigned int)((sctx->count[0] >> 3) & 0x3f);
+
+	/* Update number of bits */
+	if ((sctx->count[0] += (len << 3)) < (len << 3)) {
+		sctx->count[1]++;
+		sctx->count[1] += (len >> 29);
+	}
+
+	part_len = 64 - index;
+
+	/* Transform as many times as possible. */
+	if (len >= part_len) {
+		memcpy(&sctx->buf[index], data, part_len);
+		sha256_transform(sctx->state, sctx->buf);
+
+		for (i = part_len; i + 63 < len; i += 64)
+			sha256_transform(sctx->state, &data[i]);
+		index = 0;
+	} else {
+		i = 0;
+	}
+	
+	/* Buffer remaining input */
+	memcpy(&sctx->buf[index], &data[i], len-i);
+}
+
+static void sha256_final(void* ctx, u8 *out)
+{
+	struct sha256_ctx *sctx = ctx;
+	u8 bits[8];
+	unsigned int index, pad_len, t;
+	int i, j;
+	const u8 padding[64] = { 0x80, };
+
+	/* Save number of bits */
+	t = sctx->count[0];
+	bits[7] = t; t >>= 8;
+	bits[6] = t; t >>= 8;
+	bits[5] = t; t >>= 8;
+	bits[4] = t;
+	t = sctx->count[1];
+	bits[3] = t; t >>= 8;
+	bits[2] = t; t >>= 8;
+	bits[1] = t; t >>= 8;
+	bits[0] = t;
+
+	/* Pad out to 56 mod 64. */
+	index = (sctx->count[0] >> 3) & 0x3f;
+	pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
+	sha256_update(sctx, padding, pad_len);
+
+	/* Append length (before padding) */
+	sha256_update(sctx, bits, 8);
+
+	/* Store state in digest */
+	for (i = j = 0; i < 8; i++, j += 4) {
+		t = sctx->state[i];
+		out[j+3] = t; t >>= 8;
+		out[j+2] = t; t >>= 8;
+		out[j+1] = t; t >>= 8;
+		out[j  ] = t;
+	}
+
+	/* Zeroize sensitive information. */
+	memset(sctx, 0, sizeof(*sctx));
+}
+
+
+static struct crypto_alg alg = {
+	.cra_name	=	"sha256",
+	.cra_flags	=	CRYPTO_ALG_TYPE_DIGEST,
+	.cra_blocksize	=	SHA256_HMAC_BLOCK_SIZE,
+	.cra_ctxsize	=	sizeof(struct sha256_ctx),
+	.cra_module	=	THIS_MODULE,
+	.cra_list       =       LIST_HEAD_INIT(alg.cra_list),
+	.cra_u		=	{ .digest = {
+	.dia_digestsize	=	SHA256_DIGEST_SIZE,
+	.dia_init   	= 	sha256_init,
+	.dia_update 	=	sha256_update,
+	.dia_final  	=	sha256_final } }
+};
+
+static int __init init(void)
+{
+	return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+	crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");