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crypto/tea.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Cryptographic API. * |
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* TEA, XTEA, and XETA crypto alogrithms |
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* * The TEA and Xtended TEA algorithms were developed by David Wheeler * and Roger Needham at the Computer Laboratory of Cambridge University. * |
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* 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. * |
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* Copyright (c) 2004 Aaron Grothe ajgrothe@yahoo.com |
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*/ #include <linux/init.h> #include <linux/module.h> #include <linux/mm.h> |
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#include <asm/byteorder.h> |
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#include <linux/crypto.h> |
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#include <linux/types.h> |
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#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 |
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struct tea_ctx { u32 KEY[4]; }; struct xtea_ctx { u32 KEY[4]; }; |
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static int tea_setkey(struct crypto_tfm *tfm, const u8 *in_key, |
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unsigned int key_len) |
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{ struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
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const __le32 *key = (const __le32 *)in_key; |
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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]); |
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return 0; } |
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static void tea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { |
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u32 y, z, n, sum = 0; u32 k0, k1, k2, k3; |
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struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
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const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; |
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y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); |
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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); } |
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out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z); |
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} |
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static void tea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { |
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u32 y, z, n, sum; u32 k0, k1, k2, k3; |
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struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
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const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; |
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y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); |
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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; } |
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out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z); |
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} |
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static int xtea_setkey(struct crypto_tfm *tfm, const u8 *in_key, |
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unsigned int key_len) |
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{ struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); |
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const __le32 *key = (const __le32 *)in_key; |
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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]); |
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return 0; } |
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static void xtea_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { |
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u32 y, z, sum = 0; u32 limit = XTEA_DELTA * XTEA_ROUNDS; |
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struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); |
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const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; |
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y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); |
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while (sum != limit) { |
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y += ((z << 4 ^ z >> 5) + z) ^ (sum + ctx->KEY[sum&3]); |
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sum += XTEA_DELTA; |
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z += ((y << 4 ^ y >> 5) + y) ^ (sum + ctx->KEY[sum>>11 &3]); |
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} |
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out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z); |
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} |
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static void xtea_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { |
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u32 y, z, sum; |
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struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
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const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; |
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y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); |
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sum = XTEA_DELTA * XTEA_ROUNDS; while (sum) { |
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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]); } |
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out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z); |
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} |
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static void xeta_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { |
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u32 y, z, sum = 0; u32 limit = XTEA_DELTA * XTEA_ROUNDS; |
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struct xtea_ctx *ctx = crypto_tfm_ctx(tfm); |
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const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; |
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y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); |
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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]; } |
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out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z); |
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} |
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static void xeta_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { |
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u32 y, z, sum; |
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struct tea_ctx *ctx = crypto_tfm_ctx(tfm); |
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const __le32 *in = (const __le32 *)src; __le32 *out = (__le32 *)dst; |
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y = le32_to_cpu(in[0]); z = le32_to_cpu(in[1]); |
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sum = XTEA_DELTA * XTEA_ROUNDS; while (sum) { |
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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]; } |
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out[0] = cpu_to_le32(y); out[1] = cpu_to_le32(z); |
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} |
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static struct crypto_alg tea_algs[3] = { { |
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.cra_name = "tea", |
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.cra_driver_name = "tea-generic", |
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = TEA_BLOCK_SIZE, .cra_ctxsize = sizeof (struct tea_ctx), |
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.cra_alignmask = 3, |
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.cra_module = THIS_MODULE, |
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.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 } } |
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}, { |
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.cra_name = "xtea", |
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.cra_driver_name = "xtea-generic", |
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = XTEA_BLOCK_SIZE, .cra_ctxsize = sizeof (struct xtea_ctx), |
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.cra_alignmask = 3, |
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.cra_module = THIS_MODULE, |
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.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 } } |
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}, { |
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.cra_name = "xeta", |
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.cra_driver_name = "xeta-generic", |
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = XTEA_BLOCK_SIZE, .cra_ctxsize = sizeof (struct xtea_ctx), |
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.cra_alignmask = 3, |
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.cra_module = THIS_MODULE, |
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.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 } } |
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} }; |
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static int __init tea_mod_init(void) |
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{ |
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return crypto_register_algs(tea_algs, ARRAY_SIZE(tea_algs)); |
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} |
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static void __exit tea_mod_fini(void) |
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{ |
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crypto_unregister_algs(tea_algs, ARRAY_SIZE(tea_algs)); |
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} |
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MODULE_ALIAS_CRYPTO("tea"); |
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MODULE_ALIAS_CRYPTO("xtea"); MODULE_ALIAS_CRYPTO("xeta"); |
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subsys_initcall(tea_mod_init); |
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module_exit(tea_mod_fini); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("TEA, XTEA & XETA Cryptographic Algorithms"); |