/* * Cryptographic API. * * TEA, XTEA, and XETA crypto alogrithms * * The TEA and Xtended TEA algorithms were developed by David Wheeler * and Roger Needham at the Computer Laboratory of Cambridge University. * * Due to the order of evaluation in XTEA many people have incorrectly * implemented it. XETA (XTEA in the wrong order), exists for * compatibility with these implementations. * * Copyright (c) 2004 Aaron Grothe ajgrothe@yahoo.com * * 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 <asm/byteorder.h>#include <asm/scatterlist.h>#include <linux/crypto.h>#include <linux/types.h> #define TEA_KEY_SIZE 16#define TEA_BLOCK_SIZE 8#define TEA_ROUNDS 32#define TEA_DELTA 0x9e3779b9 #define XTEA_KEY_SIZE 16#define XTEA_BLOCK_SIZE 8#define XTEA_ROUNDS 32#define XTEA_DELTA 0x9e3779b9 struct tea_ctx { u32 KEY[4];}; struct xtea_ctx { u32 KEY[4];}; static int tea_setkey(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len){ struct tea_ctx *ctx = crypto_tfm_ctx(tfm); const __le32 *key = (const __le32 *)in_key; ctx->KEY[0] = le32_to_cpu(key[0]); ctx->KEY[1] = le32_to_cpu(key[1]); ctx->KEY[2] = le32_to_cpu(key[2]); ctx->KEY[3] = le32_to_cpu(key[3]); return 0; } static void tea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src){ u32 y, z, n, sum = 0; u32 k0, k1, k2, k3; struct tea_ctx *ctx = crypto_tfm_ctx(tfm); const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); k0 = ctx->KEY[0]; k1 = ctx->KEY[1]; k2 = ctx->KEY[2]; k3 = ctx->KEY[3]; n = TEA_ROUNDS; while (n-- > 0) { sum += TEA_DELTA; y += ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1); z += ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3); } out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z);} static void tea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src){ u32 y, z, n, sum; u32 k0, k1, k2, k3; struct tea_ctx *ctx = crypto_tfm_ctx(tfm); const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); k0 = ctx->KEY[0]; k1 = ctx->KEY[1]; k2 = ctx->KEY[2]; k3 = ctx->KEY[3]; sum = TEA_DELTA << 5; n = TEA_ROUNDS; while (n-- > 0) { z -= ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3); y -= ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1); sum -= TEA_DELTA; } out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z);} static int xtea_setkey(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len){ struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); const __le32 *key = (const __le32 *)in_key; ctx->KEY[0] = le32_to_cpu(key[0]); ctx->KEY[1] = le32_to_cpu(key[1]); ctx->KEY[2] = le32_to_cpu(key[2]); ctx->KEY[3] = le32_to_cpu(key[3]); return 0; } static void xtea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src){ u32 y, z, sum = 0; u32 limit = XTEA_DELTA * XTEA_ROUNDS; struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); while (sum != limit) { y += ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum&3]); sum += XTEA_DELTA; z += ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 &3]); } out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z);} static void xtea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src){ u32 y, z, sum; struct tea_ctx *ctx = crypto_tfm_ctx(tfm); const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); sum = XTEA_DELTA * XTEA_ROUNDS; while (sum) { z -= ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 & 3]); sum -= XTEA_DELTA; y -= ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum & 3]); } out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z);} static void xeta_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src){ u32 y, z, sum = 0; u32 limit = XTEA_DELTA * XTEA_ROUNDS; struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); while (sum != limit) { y += (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum&3]; sum += XTEA_DELTA; z += (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 &3]; } out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z);} static void xeta_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src){ u32 y, z, sum; struct tea_ctx *ctx = crypto_tfm_ctx(tfm); const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); sum = XTEA_DELTA * XTEA_ROUNDS; while (sum) { z -= (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 & 3]; sum -= XTEA_DELTA; y -= (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum & 3]; } out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z);} static struct crypto_alg tea_alg = { .cra_name = "tea", .cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = TEA_BLOCK_SIZE, .cra_ctxsize = sizeof (struct tea_ctx), .cra_alignmask = 3, .cra_module = THIS_MODULE, .cra_list = LIST_HEAD_INIT(tea_alg.cra_list), .cra_u = { .cipher = { .cia_min_keysize = TEA_KEY_SIZE, .cia_max_keysize = TEA_KEY_SIZE, .cia_setkey = tea_setkey, .cia_encrypt = tea_encrypt, .cia_decrypt = tea_decrypt } }}; static struct crypto_alg xtea_alg = { .cra_name = "xtea", .cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = XTEA_BLOCK_SIZE, .cra_ctxsize = sizeof (struct xtea_ctx), .cra_alignmask = 3, .cra_module = THIS_MODULE, .cra_list = LIST_HEAD_INIT(xtea_alg.cra_list), .cra_u = { .cipher = { .cia_min_keysize = XTEA_KEY_SIZE, .cia_max_keysize = XTEA_KEY_SIZE, .cia_setkey = xtea_setkey, .cia_encrypt = xtea_encrypt, .cia_decrypt = xtea_decrypt } }}; static struct crypto_alg xeta_alg = { .cra_name = "xeta", .cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = XTEA_BLOCK_SIZE, .cra_ctxsize = sizeof (struct xtea_ctx), .cra_alignmask = 3, .cra_module = THIS_MODULE, .cra_list = LIST_HEAD_INIT(xtea_alg.cra_list), .cra_u = { .cipher = { .cia_min_keysize = XTEA_KEY_SIZE, .cia_max_keysize = XTEA_KEY_SIZE, .cia_setkey = xtea_setkey, .cia_encrypt = xeta_encrypt, .cia_decrypt = xeta_decrypt } }}; static int __init init(void){ int ret = 0; ret = crypto_register_alg(&tea_alg); if (ret < 0) goto out; ret = crypto_register_alg(&xtea_alg); if (ret < 0) { crypto_unregister_alg(&tea_alg); goto out; } ret = crypto_register_alg(&xeta_alg); if (ret < 0) { crypto_unregister_alg(&tea_alg); crypto_unregister_alg(&xtea_alg); goto out; } out: return ret;} static void __exit fini(void){ crypto_unregister_alg(&tea_alg); crypto_unregister_alg(&xtea_alg); crypto_unregister_alg(&xeta_alg);} MODULE_ALIAS("xtea");MODULE_ALIAS("xeta"); module_init(init);module_exit(fini); MODULE_LICENSE("GPL");MODULE_DESCRIPTION("TEA, XTEA & XETA Cryptographic Algorithms");
/*
* Cryptographic API.
*
* TEA, XTEA, and XETA crypto alogrithms
*
* The TEA and Xtended TEA algorithms were developed by David Wheeler
* and Roger Needham at the Computer Laboratory of Cambridge University.
*
* Due to the order of evaluation in XTEA many people have incorrectly
* implemented it. XETA (XTEA in the wrong order), exists for
* compatibility with these implementations.
*
* Copyright (c) 2004 Aaron Grothe ajgrothe@yahoo.com
*
* 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 <asm/byteorder.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
#include <linux/types.h>
#define TEA_KEY_SIZE 16
#define TEA_BLOCK_SIZE 8
#define TEA_ROUNDS 32
#define TEA_DELTA 0x9e3779b9
#define XTEA_KEY_SIZE 16
#define XTEA_BLOCK_SIZE 8
#define XTEA_ROUNDS 32
#define XTEA_DELTA 0x9e3779b9
struct tea_ctx {
u32 KEY[4];
};
struct xtea_ctx {
u32 KEY[4];
};
static int tea_setkey(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *key = (const __le32 *)in_key;
ctx->KEY[0] = le32_to_cpu(key[0]);
ctx->KEY[1] = le32_to_cpu(key[1]);
ctx->KEY[2] = le32_to_cpu(key[2]);
ctx->KEY[3] = le32_to_cpu(key[3]);
return 0;
}
static void tea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
u32 y, z, n, sum = 0;
u32 k0, k1, k2, k3;
struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *in = (const __le32 *)src;
__le32 *out = (__le32 *)dst;
y = le32_to_cpu(in[0]);
z = le32_to_cpu(in[1]);
k0 = ctx->KEY[0];
k1 = ctx->KEY[1];
k2 = ctx->KEY[2];
k3 = ctx->KEY[3];
n = TEA_ROUNDS;
while (n-- > 0) {
sum += TEA_DELTA;
y += ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1);
z += ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3);
}
out[0] = cpu_to_le32(y);
out[1] = cpu_to_le32(z);
}
static void tea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
u32 y, z, n, sum;
u32 k0, k1, k2, k3;
struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *in = (const __le32 *)src;
__le32 *out = (__le32 *)dst;
y = le32_to_cpu(in[0]);
z = le32_to_cpu(in[1]);
k0 = ctx->KEY[0];
k1 = ctx->KEY[1];
k2 = ctx->KEY[2];
k3 = ctx->KEY[3];
sum = TEA_DELTA << 5;
n = TEA_ROUNDS;
while (n-- > 0) {
z -= ((y << 4) + k2) ^ (y + sum) ^ ((y >> 5) + k3);
y -= ((z << 4) + k0) ^ (z + sum) ^ ((z >> 5) + k1);
sum -= TEA_DELTA;
}
out[0] = cpu_to_le32(y);
out[1] = cpu_to_le32(z);
}
static int xtea_setkey(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
struct xtea_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *key = (const __le32 *)in_key;
ctx->KEY[0] = le32_to_cpu(key[0]);
ctx->KEY[1] = le32_to_cpu(key[1]);
ctx->KEY[2] = le32_to_cpu(key[2]);
ctx->KEY[3] = le32_to_cpu(key[3]);
return 0;
}
static void xtea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
u32 y, z, sum = 0;
u32 limit = XTEA_DELTA * XTEA_ROUNDS;
struct xtea_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *in = (const __le32 *)src;
__le32 *out = (__le32 *)dst;
y = le32_to_cpu(in[0]);
z = le32_to_cpu(in[1]);
while (sum != limit) {
y += ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum&3]);
sum += XTEA_DELTA;
z += ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 &3]);
}
out[0] = cpu_to_le32(y);
out[1] = cpu_to_le32(z);
}
static void xtea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
u32 y, z, sum;
struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *in = (const __le32 *)src;
__le32 *out = (__le32 *)dst;
y = le32_to_cpu(in[0]);
z = le32_to_cpu(in[1]);
sum = XTEA_DELTA * XTEA_ROUNDS;
while (sum) {
z -= ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 & 3]);
sum -= XTEA_DELTA;
y -= ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum & 3]);
}
out[0] = cpu_to_le32(y);
out[1] = cpu_to_le32(z);
}
static void xeta_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
u32 y, z, sum = 0;
u32 limit = XTEA_DELTA * XTEA_ROUNDS;
struct xtea_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *in = (const __le32 *)src;
__le32 *out = (__le32 *)dst;
y = le32_to_cpu(in[0]);
z = le32_to_cpu(in[1]);
while (sum != limit) {
y += (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum&3];
sum += XTEA_DELTA;
z += (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 &3];
}
out[0] = cpu_to_le32(y);
out[1] = cpu_to_le32(z);
}
static void xeta_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
u32 y, z, sum;
struct tea_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *in = (const __le32 *)src;
__le32 *out = (__le32 *)dst;
y = le32_to_cpu(in[0]);
z = le32_to_cpu(in[1]);
sum = XTEA_DELTA * XTEA_ROUNDS;
while (sum) {
z -= (y << 4 ^ y >> 5) + (y ^ sum) + ctx->KEY[sum>>11 & 3];
sum -= XTEA_DELTA;
y -= (z << 4 ^ z >> 5) + (z ^ sum) + ctx->KEY[sum & 3];
}
out[0] = cpu_to_le32(y);
out[1] = cpu_to_le32(z);
}
static struct crypto_alg tea_alg = {
.cra_name = "tea",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = TEA_BLOCK_SIZE,
.cra_ctxsize = sizeof (struct tea_ctx),
.cra_alignmask = 3,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(tea_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = TEA_KEY_SIZE,
.cia_max_keysize = TEA_KEY_SIZE,
.cia_setkey = tea_setkey,
.cia_encrypt = tea_encrypt,
.cia_decrypt = tea_decrypt } }
};
static struct crypto_alg xtea_alg = {
.cra_name = "xtea",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = XTEA_BLOCK_SIZE,
.cra_ctxsize = sizeof (struct xtea_ctx),
.cra_alignmask = 3,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(xtea_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = XTEA_KEY_SIZE,
.cia_max_keysize = XTEA_KEY_SIZE,
.cia_setkey = xtea_setkey,
.cia_encrypt = xtea_encrypt,
.cia_decrypt = xtea_decrypt } }
};
static struct crypto_alg xeta_alg = {
.cra_name = "xeta",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = XTEA_BLOCK_SIZE,
.cra_ctxsize = sizeof (struct xtea_ctx),
.cra_alignmask = 3,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(xtea_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = XTEA_KEY_SIZE,
.cia_max_keysize = XTEA_KEY_SIZE,
.cia_setkey = xtea_setkey,
.cia_encrypt = xeta_encrypt,
.cia_decrypt = xeta_decrypt } }
};
static int __init init(void)
{
int ret = 0;
ret = crypto_register_alg(&tea_alg);
if (ret < 0)
goto out;
ret = crypto_register_alg(&xtea_alg);
if (ret < 0) {
crypto_unregister_alg(&tea_alg);
goto out;
}
ret = crypto_register_alg(&xeta_alg);
if (ret < 0) {
crypto_unregister_alg(&tea_alg);
crypto_unregister_alg(&xtea_alg);
goto out;
}
out:
return ret;
}
static void __exit fini(void)
{
crypto_unregister_alg(&tea_alg);
crypto_unregister_alg(&xtea_alg);
crypto_unregister_alg(&xeta_alg);
}
MODULE_ALIAS("xtea");
MODULE_ALIAS("xeta");
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("TEA, XTEA & XETA Cryptographic Algorithms");