2.6.24

 crypto

diff --git a/crypto/sha256_generic.c b/crypto/sha256_generic.c
new file mode 100644
index 0000000..fd3918b
--- /dev/null
+++ b/crypto/sha256_generic.c
@@ -0,0 +1,330 @@
+/*
+ * 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 <linux/types.h>
+#include <crypto/sha.h>
+#include <asm/byteorder.h>
+
+struct sha256_ctx {
+   u32 count[2];
+   u32 state[8];
+   u8 buf[128];
+};
+
+static inline u32 Ch(u32 x, u32 y, u32 z)
+{
+   return z ^ (x & (y ^ z));
+}
+
+static inline u32 Maj(u32 x, u32 y, u32 z)
+{
+   return (x & y) | (z & (x | y));
+}
+
+#define e0(x)       (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
+#define e1(x)       (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
+#define s0(x)       (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
+#define s1(x)       (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
+
+static inline void LOAD_OP(int I, u32 *W, const u8 *input)
+{
+   W[I] = __be32_to_cpu( ((__be32*)(input))[I] );
+}
+
+static inline void BLEND_OP(int I, u32 *W)
+{
+   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];
+   int i;
+
+   /* load the input */
+   for (i = 0; i < 16; i++)
+      LOAD_OP(i, W, input);
+
+   /* now blend */
+   for (i = 16; i < 64; i++)
+      BLEND_OP(i, W);
+    
+   /* 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(struct crypto_tfm *tfm)
+{
+   struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
+   sctx->state[0] = SHA256_H0;
+   sctx->state[1] = SHA256_H1;
+   sctx->state[2] = SHA256_H2;
+   sctx->state[3] = SHA256_H3;
+   sctx->state[4] = SHA256_H4;
+   sctx->state[5] = SHA256_H5;
+   sctx->state[6] = SHA256_H6;
+   sctx->state[7] = SHA256_H7;
+   sctx->count[0] = sctx->count[1] = 0;
+}
+
+static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
+           unsigned int len)
+{
+   struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
+   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(struct crypto_tfm *tfm, u8 *out)
+{
+   struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
+   __be32 *dst = (__be32 *)out;
+   __be32 bits[2];
+   unsigned int index, pad_len;
+   int i;
+   static const u8 padding[64] = { 0x80, };
+
+   /* Save number of bits */
+   bits[1] = cpu_to_be32(sctx->count[0]);
+   bits[0] = cpu_to_be32(sctx->count[1]);
+
+   /* Pad out to 56 mod 64. */
+   index = (sctx->count[0] >> 3) & 0x3f;
+   pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
+   sha256_update(tfm, padding, pad_len);
+
+   /* Append length (before padding) */
+   sha256_update(tfm, (const u8 *)bits, sizeof(bits));
+
+   /* Store state in digest */
+   for (i = 0; i < 8; i++)
+      dst[i] = cpu_to_be32(sctx->state[i]);
+
+   /* Zeroize sensitive information. */
+   memset(sctx, 0, sizeof(*sctx));
+}
+
+
+static struct crypto_alg alg = {
+   .cra_name   =   "sha256",
+   .cra_driver_name=   "sha256-generic",
+   .cra_flags   =   CRYPTO_ALG_TYPE_DIGEST,
+   .cra_blocksize   =   SHA256_BLOCK_SIZE,
+   .cra_ctxsize   =   sizeof(struct sha256_ctx),
+   .cra_module   =   THIS_MODULE,
+   .cra_alignmask   =   3,
+   .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");
+
+MODULE_ALIAS("sha256");