summaryrefslogtreecommitdiff
path: root/crypto/aria.c
diff options
context:
space:
mode:
Diffstat (limited to 'crypto/aria.c')
-rw-r--r--crypto/aria.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/crypto/aria.c b/crypto/aria.c
new file mode 100644
index 000000000000..ac3dffac34bb
--- /dev/null
+++ b/crypto/aria.c
@@ -0,0 +1,288 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Cryptographic API.
+ *
+ * ARIA Cipher Algorithm.
+ *
+ * Documentation of ARIA can be found in RFC 5794.
+ * Copyright (c) 2022 Taehee Yoo <ap420073@gmail.com>
+ *
+ * Information for ARIA
+ * http://210.104.33.10/ARIA/index-e.html (English)
+ * http://seed.kisa.or.kr/ (Korean)
+ *
+ * Public domain version is distributed above.
+ */
+
+#include <crypto/aria.h>
+
+static void aria_set_encrypt_key(struct aria_ctx *ctx, const u8 *in_key,
+ unsigned int key_len)
+{
+ const __be32 *key = (const __be32 *)in_key;
+ u32 w0[4], w1[4], w2[4], w3[4];
+ u32 reg0, reg1, reg2, reg3;
+ const u32 *ck;
+ int rkidx = 0;
+
+ ck = &key_rc[(key_len - 16) / 8][0];
+
+ w0[0] = be32_to_cpu(key[0]);
+ w0[1] = be32_to_cpu(key[1]);
+ w0[2] = be32_to_cpu(key[2]);
+ w0[3] = be32_to_cpu(key[3]);
+
+ reg0 = w0[0] ^ ck[0];
+ reg1 = w0[1] ^ ck[1];
+ reg2 = w0[2] ^ ck[2];
+ reg3 = w0[3] ^ ck[3];
+
+ aria_subst_diff_odd(&reg0, &reg1, &reg2, &reg3);
+
+ if (key_len > 16) {
+ w1[0] = be32_to_cpu(key[4]);
+ w1[1] = be32_to_cpu(key[5]);
+ if (key_len > 24) {
+ w1[2] = be32_to_cpu(key[6]);
+ w1[3] = be32_to_cpu(key[7]);
+ } else {
+ w1[2] = 0;
+ w1[3] = 0;
+ }
+ } else {
+ w1[0] = 0;
+ w1[1] = 0;
+ w1[2] = 0;
+ w1[3] = 0;
+ }
+
+ w1[0] ^= reg0;
+ w1[1] ^= reg1;
+ w1[2] ^= reg2;
+ w1[3] ^= reg3;
+
+ reg0 = w1[0];
+ reg1 = w1[1];
+ reg2 = w1[2];
+ reg3 = w1[3];
+
+ reg0 ^= ck[4];
+ reg1 ^= ck[5];
+ reg2 ^= ck[6];
+ reg3 ^= ck[7];
+
+ aria_subst_diff_even(&reg0, &reg1, &reg2, &reg3);
+
+ reg0 ^= w0[0];
+ reg1 ^= w0[1];
+ reg2 ^= w0[2];
+ reg3 ^= w0[3];
+
+ w2[0] = reg0;
+ w2[1] = reg1;
+ w2[2] = reg2;
+ w2[3] = reg3;
+
+ reg0 ^= ck[8];
+ reg1 ^= ck[9];
+ reg2 ^= ck[10];
+ reg3 ^= ck[11];
+
+ aria_subst_diff_odd(&reg0, &reg1, &reg2, &reg3);
+
+ w3[0] = reg0 ^ w1[0];
+ w3[1] = reg1 ^ w1[1];
+ w3[2] = reg2 ^ w1[2];
+ w3[3] = reg3 ^ w1[3];
+
+ aria_gsrk(ctx->enc_key[rkidx], w0, w1, 19);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w1, w2, 19);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w2, w3, 19);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w3, w0, 19);
+
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w0, w1, 31);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w1, w2, 31);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w2, w3, 31);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w3, w0, 31);
+
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w0, w1, 67);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w1, w2, 67);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w2, w3, 67);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w3, w0, 67);
+
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w0, w1, 97);
+ if (key_len > 16) {
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w1, w2, 97);
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w2, w3, 97);
+
+ if (key_len > 24) {
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w3, w0, 97);
+
+ rkidx++;
+ aria_gsrk(ctx->enc_key[rkidx], w0, w1, 109);
+ }
+ }
+}
+
+static void aria_set_decrypt_key(struct aria_ctx *ctx)
+{
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ ctx->dec_key[0][i] = ctx->enc_key[ctx->rounds][i];
+ ctx->dec_key[ctx->rounds][i] = ctx->enc_key[0][i];
+ }
+
+ for (i = 1; i < ctx->rounds; i++) {
+ ctx->dec_key[i][0] = aria_m(ctx->enc_key[ctx->rounds - i][0]);
+ ctx->dec_key[i][1] = aria_m(ctx->enc_key[ctx->rounds - i][1]);
+ ctx->dec_key[i][2] = aria_m(ctx->enc_key[ctx->rounds - i][2]);
+ ctx->dec_key[i][3] = aria_m(ctx->enc_key[ctx->rounds - i][3]);
+
+ aria_diff_word(&ctx->dec_key[i][0], &ctx->dec_key[i][1],
+ &ctx->dec_key[i][2], &ctx->dec_key[i][3]);
+ aria_diff_byte(&ctx->dec_key[i][1],
+ &ctx->dec_key[i][2], &ctx->dec_key[i][3]);
+ aria_diff_word(&ctx->dec_key[i][0], &ctx->dec_key[i][1],
+ &ctx->dec_key[i][2], &ctx->dec_key[i][3]);
+ }
+}
+
+static int aria_set_key(struct crypto_tfm *tfm, const u8 *in_key,
+ unsigned int key_len)
+{
+ struct aria_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (key_len != 16 && key_len != 24 && key_len != 32)
+ return -EINVAL;
+
+ ctx->key_length = key_len;
+ ctx->rounds = (key_len + 32) / 4;
+
+ aria_set_encrypt_key(ctx, in_key, key_len);
+ aria_set_decrypt_key(ctx);
+
+ return 0;
+}
+
+static void __aria_crypt(struct aria_ctx *ctx, u8 *out, const u8 *in,
+ u32 key[][ARIA_RD_KEY_WORDS])
+{
+ const __be32 *src = (const __be32 *)in;
+ __be32 *dst = (__be32 *)out;
+ u32 reg0, reg1, reg2, reg3;
+ int rounds, rkidx = 0;
+
+ rounds = ctx->rounds;
+
+ reg0 = be32_to_cpu(src[0]);
+ reg1 = be32_to_cpu(src[1]);
+ reg2 = be32_to_cpu(src[2]);
+ reg3 = be32_to_cpu(src[3]);
+
+ aria_add_round_key(key[rkidx], &reg0, &reg1, &reg2, &reg3);
+ rkidx++;
+
+ aria_subst_diff_odd(&reg0, &reg1, &reg2, &reg3);
+ aria_add_round_key(key[rkidx], &reg0, &reg1, &reg2, &reg3);
+ rkidx++;
+
+ while ((rounds -= 2) > 0) {
+ aria_subst_diff_even(&reg0, &reg1, &reg2, &reg3);
+ aria_add_round_key(key[rkidx], &reg0, &reg1, &reg2, &reg3);
+ rkidx++;
+
+ aria_subst_diff_odd(&reg0, &reg1, &reg2, &reg3);
+ aria_add_round_key(key[rkidx], &reg0, &reg1, &reg2, &reg3);
+ rkidx++;
+ }
+
+ reg0 = key[rkidx][0] ^ make_u32((u8)(x1[get_u8(reg0, 0)]),
+ (u8)(x2[get_u8(reg0, 1)] >> 8),
+ (u8)(s1[get_u8(reg0, 2)]),
+ (u8)(s2[get_u8(reg0, 3)]));
+ reg1 = key[rkidx][1] ^ make_u32((u8)(x1[get_u8(reg1, 0)]),
+ (u8)(x2[get_u8(reg1, 1)] >> 8),
+ (u8)(s1[get_u8(reg1, 2)]),
+ (u8)(s2[get_u8(reg1, 3)]));
+ reg2 = key[rkidx][2] ^ make_u32((u8)(x1[get_u8(reg2, 0)]),
+ (u8)(x2[get_u8(reg2, 1)] >> 8),
+ (u8)(s1[get_u8(reg2, 2)]),
+ (u8)(s2[get_u8(reg2, 3)]));
+ reg3 = key[rkidx][3] ^ make_u32((u8)(x1[get_u8(reg3, 0)]),
+ (u8)(x2[get_u8(reg3, 1)] >> 8),
+ (u8)(s1[get_u8(reg3, 2)]),
+ (u8)(s2[get_u8(reg3, 3)]));
+
+ dst[0] = cpu_to_be32(reg0);
+ dst[1] = cpu_to_be32(reg1);
+ dst[2] = cpu_to_be32(reg2);
+ dst[3] = cpu_to_be32(reg3);
+}
+
+static void aria_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+{
+ struct aria_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ __aria_crypt(ctx, out, in, ctx->enc_key);
+}
+
+static void aria_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+{
+ struct aria_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ __aria_crypt(ctx, out, in, ctx->dec_key);
+}
+
+static struct crypto_alg aria_alg = {
+ .cra_name = "aria",
+ .cra_driver_name = "aria-generic",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = ARIA_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct aria_ctx),
+ .cra_alignmask = 3,
+ .cra_module = THIS_MODULE,
+ .cra_u = {
+ .cipher = {
+ .cia_min_keysize = ARIA_MIN_KEY_SIZE,
+ .cia_max_keysize = ARIA_MAX_KEY_SIZE,
+ .cia_setkey = aria_set_key,
+ .cia_encrypt = aria_encrypt,
+ .cia_decrypt = aria_decrypt
+ }
+ }
+};
+
+static int __init aria_init(void)
+{
+ return crypto_register_alg(&aria_alg);
+}
+
+static void __exit aria_fini(void)
+{
+ crypto_unregister_alg(&aria_alg);
+}
+
+subsys_initcall(aria_init);
+module_exit(aria_fini);
+
+MODULE_DESCRIPTION("ARIA Cipher Algorithm");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Taehee Yoo <ap420073@gmail.com>");
+MODULE_ALIAS_CRYPTO("aria");
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-30 20:37:01 +0000