forked from mirrors/linux
6c178fd66b
Instead of specifying a nonzero alignmask, use the unaligned access helpers. This eliminates unnecessary alignment operations on most CPUs, which can handle unaligned accesses efficiently, and brings us a step closer to eventually removing support for the alignmask field. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
314 lines
7.5 KiB
C
314 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cryptographic API.
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*
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* ARIA Cipher Algorithm.
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*
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* Documentation of ARIA can be found in RFC 5794.
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* Copyright (c) 2022 Taehee Yoo <ap420073@gmail.com>
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*
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* Information for ARIA
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* http://210.104.33.10/ARIA/index-e.html (English)
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* http://seed.kisa.or.kr/ (Korean)
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*
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* Public domain version is distributed above.
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*/
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#include <crypto/aria.h>
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#include <linux/unaligned.h>
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static const u32 key_rc[20] = {
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0x517cc1b7, 0x27220a94, 0xfe13abe8, 0xfa9a6ee0,
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0x6db14acc, 0x9e21c820, 0xff28b1d5, 0xef5de2b0,
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0xdb92371d, 0x2126e970, 0x03249775, 0x04e8c90e,
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0x517cc1b7, 0x27220a94, 0xfe13abe8, 0xfa9a6ee0,
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0x6db14acc, 0x9e21c820, 0xff28b1d5, 0xef5de2b0
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};
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static void aria_set_encrypt_key(struct aria_ctx *ctx, const u8 *in_key,
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unsigned int key_len)
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{
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u32 w0[4], w1[4], w2[4], w3[4];
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u32 reg0, reg1, reg2, reg3;
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const u32 *ck;
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int rkidx = 0;
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ck = &key_rc[(key_len - 16) / 2];
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w0[0] = get_unaligned_be32(&in_key[0]);
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w0[1] = get_unaligned_be32(&in_key[4]);
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w0[2] = get_unaligned_be32(&in_key[8]);
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w0[3] = get_unaligned_be32(&in_key[12]);
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reg0 = w0[0] ^ ck[0];
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reg1 = w0[1] ^ ck[1];
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reg2 = w0[2] ^ ck[2];
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reg3 = w0[3] ^ ck[3];
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aria_subst_diff_odd(®0, ®1, ®2, ®3);
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if (key_len > 16) {
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w1[0] = get_unaligned_be32(&in_key[16]);
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w1[1] = get_unaligned_be32(&in_key[20]);
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if (key_len > 24) {
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w1[2] = get_unaligned_be32(&in_key[24]);
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w1[3] = get_unaligned_be32(&in_key[28]);
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} else {
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w1[2] = 0;
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w1[3] = 0;
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}
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} else {
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w1[0] = 0;
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w1[1] = 0;
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w1[2] = 0;
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w1[3] = 0;
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}
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w1[0] ^= reg0;
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w1[1] ^= reg1;
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w1[2] ^= reg2;
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w1[3] ^= reg3;
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reg0 = w1[0];
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reg1 = w1[1];
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reg2 = w1[2];
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reg3 = w1[3];
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reg0 ^= ck[4];
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reg1 ^= ck[5];
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reg2 ^= ck[6];
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reg3 ^= ck[7];
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aria_subst_diff_even(®0, ®1, ®2, ®3);
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reg0 ^= w0[0];
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reg1 ^= w0[1];
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reg2 ^= w0[2];
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reg3 ^= w0[3];
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w2[0] = reg0;
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w2[1] = reg1;
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w2[2] = reg2;
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w2[3] = reg3;
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reg0 ^= ck[8];
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reg1 ^= ck[9];
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reg2 ^= ck[10];
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reg3 ^= ck[11];
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aria_subst_diff_odd(®0, ®1, ®2, ®3);
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w3[0] = reg0 ^ w1[0];
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w3[1] = reg1 ^ w1[1];
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w3[2] = reg2 ^ w1[2];
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w3[3] = reg3 ^ w1[3];
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aria_gsrk(ctx->enc_key[rkidx], w0, w1, 19);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w1, w2, 19);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w2, w3, 19);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w3, w0, 19);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w0, w1, 31);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w1, w2, 31);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w2, w3, 31);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w3, w0, 31);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w0, w1, 67);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w1, w2, 67);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w2, w3, 67);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w3, w0, 67);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w0, w1, 97);
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if (key_len > 16) {
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w1, w2, 97);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w2, w3, 97);
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if (key_len > 24) {
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w3, w0, 97);
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rkidx++;
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aria_gsrk(ctx->enc_key[rkidx], w0, w1, 109);
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}
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}
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}
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static void aria_set_decrypt_key(struct aria_ctx *ctx)
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{
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int i;
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for (i = 0; i < 4; i++) {
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ctx->dec_key[0][i] = ctx->enc_key[ctx->rounds][i];
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ctx->dec_key[ctx->rounds][i] = ctx->enc_key[0][i];
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}
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for (i = 1; i < ctx->rounds; i++) {
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ctx->dec_key[i][0] = aria_m(ctx->enc_key[ctx->rounds - i][0]);
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ctx->dec_key[i][1] = aria_m(ctx->enc_key[ctx->rounds - i][1]);
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ctx->dec_key[i][2] = aria_m(ctx->enc_key[ctx->rounds - i][2]);
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ctx->dec_key[i][3] = aria_m(ctx->enc_key[ctx->rounds - i][3]);
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aria_diff_word(&ctx->dec_key[i][0], &ctx->dec_key[i][1],
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&ctx->dec_key[i][2], &ctx->dec_key[i][3]);
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aria_diff_byte(&ctx->dec_key[i][1],
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&ctx->dec_key[i][2], &ctx->dec_key[i][3]);
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aria_diff_word(&ctx->dec_key[i][0], &ctx->dec_key[i][1],
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&ctx->dec_key[i][2], &ctx->dec_key[i][3]);
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}
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}
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int aria_set_key(struct crypto_tfm *tfm, const u8 *in_key, unsigned int key_len)
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{
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struct aria_ctx *ctx = crypto_tfm_ctx(tfm);
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if (key_len != 16 && key_len != 24 && key_len != 32)
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return -EINVAL;
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BUILD_BUG_ON(sizeof(ctx->enc_key) != 272);
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BUILD_BUG_ON(sizeof(ctx->dec_key) != 272);
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BUILD_BUG_ON(sizeof(int) != sizeof(ctx->rounds));
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ctx->key_length = key_len;
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ctx->rounds = (key_len + 32) / 4;
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aria_set_encrypt_key(ctx, in_key, key_len);
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aria_set_decrypt_key(ctx);
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return 0;
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}
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EXPORT_SYMBOL_GPL(aria_set_key);
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static void __aria_crypt(struct aria_ctx *ctx, u8 *out, const u8 *in,
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u32 key[][ARIA_RD_KEY_WORDS])
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{
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u32 reg0, reg1, reg2, reg3;
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int rounds, rkidx = 0;
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rounds = ctx->rounds;
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reg0 = get_unaligned_be32(&in[0]);
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reg1 = get_unaligned_be32(&in[4]);
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reg2 = get_unaligned_be32(&in[8]);
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reg3 = get_unaligned_be32(&in[12]);
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aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3);
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rkidx++;
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aria_subst_diff_odd(®0, ®1, ®2, ®3);
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aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3);
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rkidx++;
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while ((rounds -= 2) > 0) {
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aria_subst_diff_even(®0, ®1, ®2, ®3);
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aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3);
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rkidx++;
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aria_subst_diff_odd(®0, ®1, ®2, ®3);
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aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3);
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rkidx++;
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}
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reg0 = key[rkidx][0] ^ make_u32((u8)(x1[get_u8(reg0, 0)]),
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(u8)(x2[get_u8(reg0, 1)] >> 8),
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(u8)(s1[get_u8(reg0, 2)]),
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(u8)(s2[get_u8(reg0, 3)]));
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reg1 = key[rkidx][1] ^ make_u32((u8)(x1[get_u8(reg1, 0)]),
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(u8)(x2[get_u8(reg1, 1)] >> 8),
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(u8)(s1[get_u8(reg1, 2)]),
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(u8)(s2[get_u8(reg1, 3)]));
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reg2 = key[rkidx][2] ^ make_u32((u8)(x1[get_u8(reg2, 0)]),
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(u8)(x2[get_u8(reg2, 1)] >> 8),
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(u8)(s1[get_u8(reg2, 2)]),
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(u8)(s2[get_u8(reg2, 3)]));
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reg3 = key[rkidx][3] ^ make_u32((u8)(x1[get_u8(reg3, 0)]),
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(u8)(x2[get_u8(reg3, 1)] >> 8),
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(u8)(s1[get_u8(reg3, 2)]),
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(u8)(s2[get_u8(reg3, 3)]));
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put_unaligned_be32(reg0, &out[0]);
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put_unaligned_be32(reg1, &out[4]);
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put_unaligned_be32(reg2, &out[8]);
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put_unaligned_be32(reg3, &out[12]);
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}
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void aria_encrypt(void *_ctx, u8 *out, const u8 *in)
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{
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struct aria_ctx *ctx = (struct aria_ctx *)_ctx;
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__aria_crypt(ctx, out, in, ctx->enc_key);
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}
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EXPORT_SYMBOL_GPL(aria_encrypt);
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void aria_decrypt(void *_ctx, u8 *out, const u8 *in)
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{
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struct aria_ctx *ctx = (struct aria_ctx *)_ctx;
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__aria_crypt(ctx, out, in, ctx->dec_key);
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}
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EXPORT_SYMBOL_GPL(aria_decrypt);
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static void __aria_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct aria_ctx *ctx = crypto_tfm_ctx(tfm);
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__aria_crypt(ctx, out, in, ctx->enc_key);
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}
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static void __aria_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct aria_ctx *ctx = crypto_tfm_ctx(tfm);
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__aria_crypt(ctx, out, in, ctx->dec_key);
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}
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static struct crypto_alg aria_alg = {
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.cra_name = "aria",
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.cra_driver_name = "aria-generic",
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.cra_priority = 100,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = ARIA_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct aria_ctx),
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.cra_module = THIS_MODULE,
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.cra_u = {
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.cipher = {
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.cia_min_keysize = ARIA_MIN_KEY_SIZE,
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.cia_max_keysize = ARIA_MAX_KEY_SIZE,
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.cia_setkey = aria_set_key,
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.cia_encrypt = __aria_encrypt,
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.cia_decrypt = __aria_decrypt
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}
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}
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};
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static int __init aria_init(void)
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{
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return crypto_register_alg(&aria_alg);
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}
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static void __exit aria_fini(void)
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{
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crypto_unregister_alg(&aria_alg);
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}
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subsys_initcall(aria_init);
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module_exit(aria_fini);
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MODULE_DESCRIPTION("ARIA Cipher Algorithm");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Taehee Yoo <ap420073@gmail.com>");
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MODULE_ALIAS_CRYPTO("aria");
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MODULE_ALIAS_CRYPTO("aria-generic");
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