/* * Cryptographic API. * * SHA-3, as specified in * http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf * * SHA-3 code by Jeff Garzik <jeff@garzik.org> * * 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 <crypto/internal/hash.h> #include <linux/init.h> #include <linux/module.h> #include <linux/types.h> #include <crypto/sha3.h> #include <asm/byteorder.h> #define KECCAK_ROUNDS 24 #define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y)))) static const u64 keccakf_rndc[24] = { 0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808aULL, 0x8000000080008000ULL, 0x000000000000808bULL, 0x0000000080000001ULL, 0x8000000080008081ULL, 0x8000000000008009ULL, 0x000000000000008aULL, 0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000aULL, 0x000000008000808bULL, 0x800000000000008bULL, 0x8000000000008089ULL, 0x8000000000008003ULL, 0x8000000000008002ULL, 0x8000000000000080ULL, 0x000000000000800aULL, 0x800000008000000aULL, 0x8000000080008081ULL, 0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL }; static const int keccakf_rotc[24] = { 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44 }; static const int keccakf_piln[24] = { 10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4, 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1 }; /* update the state with given number of rounds */ static void keccakf(u64 st[25]) { int i, j, round; u64 t, bc[5]; for (round = 0; round < KECCAK_ROUNDS; round++) { /* Theta */ for (i = 0; i < 5; i++) bc[i] = st[i] ^ st[i + 5] ^ st[i + 10] ^ st[i + 15] ^ st[i + 20]; for (i = 0; i < 5; i++) { t = bc[(i + 4) % 5] ^ ROTL64(bc[(i + 1) % 5], 1); for (j = 0; j < 25; j += 5) st[j + i] ^= t; } /* Rho Pi */ t = st[1]; for (i = 0; i < 24; i++) { j = keccakf_piln[i]; bc[0] = st[j]; st[j] = ROTL64(t, keccakf_rotc[i]); t = bc[0]; } /* Chi */ for (j = 0; j < 25; j += 5) { for (i = 0; i < 5; i++) bc[i] = st[j + i]; for (i = 0; i < 5; i++) st[j + i] ^= (~bc[(i + 1) % 5]) & bc[(i + 2) % 5]; } /* Iota */ st[0] ^= keccakf_rndc[round]; } } static void sha3_init(struct sha3_state *sctx, unsigned int digest_sz) { memset(sctx, 0, sizeof(*sctx)); sctx->md_len = digest_sz; sctx->rsiz = 200 - 2 * digest_sz; sctx->rsizw = sctx->rsiz / 8; } static int sha3_224_init(struct shash_desc *desc) { struct sha3_state *sctx = shash_desc_ctx(desc); sha3_init(sctx, SHA3_224_DIGEST_SIZE); return 0; } static int sha3_256_init(struct shash_desc *desc) { struct sha3_state *sctx = shash_desc_ctx(desc); sha3_init(sctx, SHA3_256_DIGEST_SIZE); return 0; } static int sha3_384_init(struct shash_desc *desc) { struct sha3_state *sctx = shash_desc_ctx(desc); sha3_init(sctx, SHA3_384_DIGEST_SIZE); return 0; } static int sha3_512_init(struct shash_desc *desc) { struct sha3_state *sctx = shash_desc_ctx(desc); sha3_init(sctx, SHA3_512_DIGEST_SIZE); return 0; } static int sha3_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct sha3_state *sctx = shash_desc_ctx(desc); unsigned int done; const u8 *src; done = 0; src = data; if ((sctx->partial + len) > (sctx->rsiz - 1)) { if (sctx->partial) { done = -sctx->partial; memcpy(sctx->buf + sctx->partial, data, done + sctx->rsiz); src = sctx->buf; } do { unsigned int i; for (i = 0; i < sctx->rsizw; i++) sctx->st[i] ^= ((u64 *) src)[i]; keccakf(sctx->st); done += sctx->rsiz; src = data + done; } while (done + (sctx->rsiz - 1) < len); sctx->partial = 0; } memcpy(sctx->buf + sctx->partial, src, len - done); sctx->partial += (len - done); return 0; } static int sha3_final(struct shash_desc *desc, u8 *out) { struct sha3_state *sctx = shash_desc_ctx(desc); unsigned int i, inlen = sctx->partial; sctx->buf[inlen++] = 0x06; memset(sctx->buf + inlen, 0, sctx->rsiz - inlen); sctx->buf[sctx->rsiz - 1] |= 0x80; for (i = 0; i < sctx->rsizw; i++) sctx->st[i] ^= ((u64 *) sctx->buf)[i]; keccakf(sctx->st); for (i = 0; i < sctx->rsizw; i++) sctx->st[i] = cpu_to_le64(sctx->st[i]); memcpy(out, sctx->st, sctx->md_len); memset(sctx, 0, sizeof(*sctx)); return 0; } static struct shash_alg sha3_224 = { .digestsize = SHA3_224_DIGEST_SIZE, .init = sha3_224_init, .update = sha3_update, .final = sha3_final, .descsize = sizeof(struct sha3_state), .base = { .cra_name = "sha3-224", .cra_driver_name = "sha3-224-generic", .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = SHA3_224_BLOCK_SIZE, .cra_module = THIS_MODULE, } }; static struct shash_alg sha3_256 = { .digestsize = SHA3_256_DIGEST_SIZE, .init = sha3_256_init, .update = sha3_update, .final = sha3_final, .descsize = sizeof(struct sha3_state), .base = { .cra_name = "sha3-256", .cra_driver_name = "sha3-256-generic", .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = SHA3_256_BLOCK_SIZE, .cra_module = THIS_MODULE, } }; static struct shash_alg sha3_384 = { .digestsize = SHA3_384_DIGEST_SIZE, .init = sha3_384_init, .update = sha3_update, .final = sha3_final, .descsize = sizeof(struct sha3_state), .base = { .cra_name = "sha3-384", .cra_driver_name = "sha3-384-generic", .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = SHA3_384_BLOCK_SIZE, .cra_module = THIS_MODULE, } }; static struct shash_alg sha3_512 = { .digestsize = SHA3_512_DIGEST_SIZE, .init = sha3_512_init, .update = sha3_update, .final = sha3_final, .descsize = sizeof(struct sha3_state), .base = { .cra_name = "sha3-512", .cra_driver_name = "sha3-512-generic", .cra_flags = CRYPTO_ALG_TYPE_SHASH, .cra_blocksize = SHA3_512_BLOCK_SIZE, .cra_module = THIS_MODULE, } }; static int __init sha3_generic_mod_init(void) { int ret; ret = crypto_register_shash(&sha3_224); if (ret < 0) goto err_out; ret = crypto_register_shash(&sha3_256); if (ret < 0) goto err_out_224; ret = crypto_register_shash(&sha3_384); if (ret < 0) goto err_out_256; ret = crypto_register_shash(&sha3_512); if (ret < 0) goto err_out_384; return 0; err_out_384: crypto_unregister_shash(&sha3_384); err_out_256: crypto_unregister_shash(&sha3_256); err_out_224: crypto_unregister_shash(&sha3_224); err_out: return ret; } static void __exit sha3_generic_mod_fini(void) { crypto_unregister_shash(&sha3_224); crypto_unregister_shash(&sha3_256); crypto_unregister_shash(&sha3_384); crypto_unregister_shash(&sha3_512); } module_init(sha3_generic_mod_init); module_exit(sha3_generic_mod_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("SHA-3 Secure Hash Algorithm"); MODULE_ALIAS_CRYPTO("sha3-224"); MODULE_ALIAS_CRYPTO("sha3-224-generic"); MODULE_ALIAS_CRYPTO("sha3-256"); MODULE_ALIAS_CRYPTO("sha3-256-generic"); MODULE_ALIAS_CRYPTO("sha3-384"); MODULE_ALIAS_CRYPTO("sha3-384-generic"); MODULE_ALIAS_CRYPTO("sha3-512"); MODULE_ALIAS_CRYPTO("sha3-512-generic");