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author | Taehee Yoo <ap420073@gmail.com> | 2022-07-04 12:42:48 +0300 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2022-07-15 11:38:19 +0300 |
commit | e4e712bbbd6d73263d964d6cb390b373738b62ab (patch) | |
tree | 321067b8897c4a506106ab6b5064398a88439d8c /crypto/aria.c | |
parent | 79e6e2f3f3ff345947075341781e900e4f70db81 (diff) | |
download | linux-e4e712bbbd6d73263d964d6cb390b373738b62ab.tar.xz |
crypto: aria - Implement ARIA symmetric cipher algorithm
ARIA(RFC 5794) is a symmetric block cipher algorithm.
This algorithm is being used widely in South Korea as a standard cipher
algorithm.
This code is written based on the ARIA implementation of OpenSSL.
The OpenSSL code is based on the distributed source code[1] by KISA.
ARIA has three key sizes and corresponding rounds.
ARIA128: 12 rounds.
ARIA192: 14 rounds.
ARIA245: 16 rounds.
[1] https://seed.kisa.or.kr/kisa/Board/19/detailView.do (Korean)
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/aria.c')
-rw-r--r-- | crypto/aria.c | 288 |
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(®0, ®1, ®2, ®3); + + 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(®0, ®1, ®2, ®3); + + 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(®0, ®1, ®2, ®3); + + 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], ®0, ®1, ®2, ®3); + rkidx++; + + aria_subst_diff_odd(®0, ®1, ®2, ®3); + aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3); + rkidx++; + + while ((rounds -= 2) > 0) { + aria_subst_diff_even(®0, ®1, ®2, ®3); + aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3); + rkidx++; + + aria_subst_diff_odd(®0, ®1, ®2, ®3); + aria_add_round_key(key[rkidx], ®0, ®1, ®2, ®3); + 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"); |