Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 252 insertions, 0 deletions

diff --git a/crypto/salsa20_generic.c b/crypto/salsa20_generic.c
new file mode 100644
index 00000000..eac10c11
--- /dev/null
+++ b/crypto/salsa20_generic.c
@@ -0,0 +1,252 @@
+/*
+ * Salsa20: Salsa20 stream cipher algorithm
+ *
+ * Copyright (c) 2007 Tan Swee Heng <thesweeheng@gmail.com>
+ *
+ * Derived from:
+ * - salsa20.c: Public domain C code by Daniel J. Bernstein <djb@cr.yp.to>
+ *
+ * Salsa20 is a stream cipher candidate in eSTREAM, the ECRYPT Stream
+ * Cipher Project. It is designed by Daniel J. Bernstein <djb@cr.yp.to>.
+ * More information about eSTREAM and Salsa20 can be found here:
+ *   http://www.ecrypt.eu.org/stream/
+ *   http://cr.yp.to/snuffle.html
+ *
+ * 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/errno.h>
+#include <linux/crypto.h>
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <crypto/algapi.h>
+#include <asm/byteorder.h>
+
+#define SALSA20_IV_SIZE        8U
+#define SALSA20_MIN_KEY_SIZE  16U
+#define SALSA20_MAX_KEY_SIZE  32U
+
+/*
+ * Start of code taken from D. J. Bernstein's reference implementation.
+ * With some modifications and optimizations made to suit our needs.
+ */
+
+/*
+salsa20-ref.c version 20051118
+D. J. Bernstein
+Public domain.
+*/
+
+#define U32TO8_LITTLE(p, v) \
+	{ (p)[0] = (v >>  0) & 0xff; (p)[1] = (v >>  8) & 0xff; \
+	  (p)[2] = (v >> 16) & 0xff; (p)[3] = (v >> 24) & 0xff; }
+#define U8TO32_LITTLE(p)   \
+	(((u32)((p)[0])      ) | ((u32)((p)[1]) <<  8) | \
+	 ((u32)((p)[2]) << 16) | ((u32)((p)[3]) << 24)   )
+
+struct salsa20_ctx
+{
+	u32 input[16];
+};
+
+static void salsa20_wordtobyte(u8 output[64], const u32 input[16])
+{
+	u32 x[16];
+	int i;
+
+	memcpy(x, input, sizeof(x));
+	for (i = 20; i > 0; i -= 2) {
+		x[ 4] ^= rol32((x[ 0] + x[12]),  7);
+		x[ 8] ^= rol32((x[ 4] + x[ 0]),  9);
+		x[12] ^= rol32((x[ 8] + x[ 4]), 13);
+		x[ 0] ^= rol32((x[12] + x[ 8]), 18);
+		x[ 9] ^= rol32((x[ 5] + x[ 1]),  7);
+		x[13] ^= rol32((x[ 9] + x[ 5]),  9);
+		x[ 1] ^= rol32((x[13] + x[ 9]), 13);
+		x[ 5] ^= rol32((x[ 1] + x[13]), 18);
+		x[14] ^= rol32((x[10] + x[ 6]),  7);
+		x[ 2] ^= rol32((x[14] + x[10]),  9);
+		x[ 6] ^= rol32((x[ 2] + x[14]), 13);
+		x[10] ^= rol32((x[ 6] + x[ 2]), 18);
+		x[ 3] ^= rol32((x[15] + x[11]),  7);
+		x[ 7] ^= rol32((x[ 3] + x[15]),  9);
+		x[11] ^= rol32((x[ 7] + x[ 3]), 13);
+		x[15] ^= rol32((x[11] + x[ 7]), 18);
+		x[ 1] ^= rol32((x[ 0] + x[ 3]),  7);
+		x[ 2] ^= rol32((x[ 1] + x[ 0]),  9);
+		x[ 3] ^= rol32((x[ 2] + x[ 1]), 13);
+		x[ 0] ^= rol32((x[ 3] + x[ 2]), 18);
+		x[ 6] ^= rol32((x[ 5] + x[ 4]),  7);
+		x[ 7] ^= rol32((x[ 6] + x[ 5]),  9);
+		x[ 4] ^= rol32((x[ 7] + x[ 6]), 13);
+		x[ 5] ^= rol32((x[ 4] + x[ 7]), 18);
+		x[11] ^= rol32((x[10] + x[ 9]),  7);
+		x[ 8] ^= rol32((x[11] + x[10]),  9);
+		x[ 9] ^= rol32((x[ 8] + x[11]), 13);
+		x[10] ^= rol32((x[ 9] + x[ 8]), 18);
+		x[12] ^= rol32((x[15] + x[14]),  7);
+		x[13] ^= rol32((x[12] + x[15]),  9);
+		x[14] ^= rol32((x[13] + x[12]), 13);
+		x[15] ^= rol32((x[14] + x[13]), 18);
+	}
+	for (i = 0; i < 16; ++i)
+		x[i] += input[i];
+	for (i = 0; i < 16; ++i)
+		U32TO8_LITTLE(output + 4 * i,x[i]);
+}
+
+static const char sigma[16] = "expand 32-byte k";
+static const char tau[16] = "expand 16-byte k";
+
+static void salsa20_keysetup(struct salsa20_ctx *ctx, const u8 *k, u32 kbytes)
+{
+	const char *constants;
+
+	ctx->input[1] = U8TO32_LITTLE(k + 0);
+	ctx->input[2] = U8TO32_LITTLE(k + 4);
+	ctx->input[3] = U8TO32_LITTLE(k + 8);
+	ctx->input[4] = U8TO32_LITTLE(k + 12);
+	if (kbytes == 32) { /* recommended */
+		k += 16;
+		constants = sigma;
+	} else { /* kbytes == 16 */
+		constants = tau;
+	}
+	ctx->input[11] = U8TO32_LITTLE(k + 0);
+	ctx->input[12] = U8TO32_LITTLE(k + 4);
+	ctx->input[13] = U8TO32_LITTLE(k + 8);
+	ctx->input[14] = U8TO32_LITTLE(k + 12);
+	ctx->input[0] = U8TO32_LITTLE(constants + 0);
+	ctx->input[5] = U8TO32_LITTLE(constants + 4);
+	ctx->input[10] = U8TO32_LITTLE(constants + 8);
+	ctx->input[15] = U8TO32_LITTLE(constants + 12);
+}
+
+static void salsa20_ivsetup(struct salsa20_ctx *ctx, const u8 *iv)
+{
+	ctx->input[6] = U8TO32_LITTLE(iv + 0);
+	ctx->input[7] = U8TO32_LITTLE(iv + 4);
+	ctx->input[8] = 0;
+	ctx->input[9] = 0;
+}
+
+static void salsa20_encrypt_bytes(struct salsa20_ctx *ctx, u8 *dst,
+				  const u8 *src, unsigned int bytes)
+{
+	u8 buf[64];
+
+	if (dst != src)
+		memcpy(dst, src, bytes);
+
+	while (bytes) {
+		salsa20_wordtobyte(buf, ctx->input);
+
+		ctx->input[8]++;
+		if (!ctx->input[8])
+			ctx->input[9]++;
+
+		if (bytes <= 64) {
+			crypto_xor(dst, buf, bytes);
+			return;
+		}
+
+		crypto_xor(dst, buf, 64);
+		bytes -= 64;
+		dst += 64;
+	}
+}
+
+/*
+ * End of code taken from D. J. Bernstein's reference implementation.
+ */
+
+static int setkey(struct crypto_tfm *tfm, const u8 *key,
+		  unsigned int keysize)
+{
+	struct salsa20_ctx *ctx = crypto_tfm_ctx(tfm);
+	salsa20_keysetup(ctx, key, keysize);
+	return 0;
+}
+
+static int encrypt(struct blkcipher_desc *desc,
+		   struct scatterlist *dst, struct scatterlist *src,
+		   unsigned int nbytes)
+{
+	struct blkcipher_walk walk;
+	struct crypto_blkcipher *tfm = desc->tfm;
+	struct salsa20_ctx *ctx = crypto_blkcipher_ctx(tfm);
+	int err;
+
+	blkcipher_walk_init(&walk, dst, src, nbytes);
+	err = blkcipher_walk_virt_block(desc, &walk, 64);
+
+	salsa20_ivsetup(ctx, walk.iv);
+
+	if (likely(walk.nbytes == nbytes))
+	{
+		salsa20_encrypt_bytes(ctx, walk.dst.virt.addr,
+				      walk.src.virt.addr, nbytes);
+		return blkcipher_walk_done(desc, &walk, 0);
+	}
+
+	while (walk.nbytes >= 64) {
+		salsa20_encrypt_bytes(ctx, walk.dst.virt.addr,
+				      walk.src.virt.addr,
+				      walk.nbytes - (walk.nbytes % 64));
+		err = blkcipher_walk_done(desc, &walk, walk.nbytes % 64);
+	}
+
+	if (walk.nbytes) {
+		salsa20_encrypt_bytes(ctx, walk.dst.virt.addr,
+				      walk.src.virt.addr, walk.nbytes);
+		err = blkcipher_walk_done(desc, &walk, 0);
+	}
+
+	return err;
+}
+
+static struct crypto_alg alg = {
+	.cra_name           =   "salsa20",
+	.cra_driver_name    =   "salsa20-generic",
+	.cra_priority       =   100,
+	.cra_flags          =   CRYPTO_ALG_TYPE_BLKCIPHER,
+	.cra_type           =   &crypto_blkcipher_type,
+	.cra_blocksize      =   1,
+	.cra_ctxsize        =   sizeof(struct salsa20_ctx),
+	.cra_alignmask      =	3,
+	.cra_module         =   THIS_MODULE,
+	.cra_list           =   LIST_HEAD_INIT(alg.cra_list),
+	.cra_u              =   {
+		.blkcipher = {
+			.setkey         =   setkey,
+			.encrypt        =   encrypt,
+			.decrypt        =   encrypt,
+			.min_keysize    =   SALSA20_MIN_KEY_SIZE,
+			.max_keysize    =   SALSA20_MAX_KEY_SIZE,
+			.ivsize         =   SALSA20_IV_SIZE,
+		}
+	}
+};
+
+static int __init salsa20_generic_mod_init(void)
+{
+	return crypto_register_alg(&alg);
+}
+
+static void __exit salsa20_generic_mod_fini(void)
+{
+	crypto_unregister_alg(&alg);
+}
+
+module_init(salsa20_generic_mod_init);
+module_exit(salsa20_generic_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION ("Salsa20 stream cipher algorithm");
+MODULE_ALIAS("salsa20");