301 lines
6.9 KiB
C
301 lines
6.9 KiB
C
/*
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* Cryptographic API.
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*
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* SHA-3, as specified in
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* http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf
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*
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* SHA-3 code by Jeff Garzik <jeff@garzik.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)•
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* any later version.
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*
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*/
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#include <crypto/internal/hash.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <crypto/sha3.h>
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#include <asm/byteorder.h>
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#define KECCAK_ROUNDS 24
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#define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y))))
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static const u64 keccakf_rndc[24] = {
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0x0000000000000001, 0x0000000000008082, 0x800000000000808a,
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0x8000000080008000, 0x000000000000808b, 0x0000000080000001,
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0x8000000080008081, 0x8000000000008009, 0x000000000000008a,
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0x0000000000000088, 0x0000000080008009, 0x000000008000000a,
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0x000000008000808b, 0x800000000000008b, 0x8000000000008089,
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0x8000000000008003, 0x8000000000008002, 0x8000000000000080,
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0x000000000000800a, 0x800000008000000a, 0x8000000080008081,
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0x8000000000008080, 0x0000000080000001, 0x8000000080008008
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};
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static const int keccakf_rotc[24] = {
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1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14,
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27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44
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};
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static const int keccakf_piln[24] = {
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10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4,
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15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1
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};
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/* update the state with given number of rounds */
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static void keccakf(u64 st[25])
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{
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int i, j, round;
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u64 t, bc[5];
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for (round = 0; round < KECCAK_ROUNDS; round++) {
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/* Theta */
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for (i = 0; i < 5; i++)
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bc[i] = st[i] ^ st[i + 5] ^ st[i + 10] ^ st[i + 15]
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^ st[i + 20];
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for (i = 0; i < 5; i++) {
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t = bc[(i + 4) % 5] ^ ROTL64(bc[(i + 1) % 5], 1);
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for (j = 0; j < 25; j += 5)
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st[j + i] ^= t;
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}
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/* Rho Pi */
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t = st[1];
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for (i = 0; i < 24; i++) {
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j = keccakf_piln[i];
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bc[0] = st[j];
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st[j] = ROTL64(t, keccakf_rotc[i]);
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t = bc[0];
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}
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/* Chi */
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for (j = 0; j < 25; j += 5) {
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for (i = 0; i < 5; i++)
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bc[i] = st[j + i];
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for (i = 0; i < 5; i++)
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st[j + i] ^= (~bc[(i + 1) % 5]) &
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bc[(i + 2) % 5];
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}
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/* Iota */
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st[0] ^= keccakf_rndc[round];
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}
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}
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static void sha3_init(struct sha3_state *sctx, unsigned int digest_sz)
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{
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memset(sctx, 0, sizeof(*sctx));
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sctx->md_len = digest_sz;
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sctx->rsiz = 200 - 2 * digest_sz;
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sctx->rsizw = sctx->rsiz / 8;
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}
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static int sha3_224_init(struct shash_desc *desc)
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{
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struct sha3_state *sctx = shash_desc_ctx(desc);
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sha3_init(sctx, SHA3_224_DIGEST_SIZE);
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return 0;
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}
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static int sha3_256_init(struct shash_desc *desc)
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{
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struct sha3_state *sctx = shash_desc_ctx(desc);
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sha3_init(sctx, SHA3_256_DIGEST_SIZE);
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return 0;
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}
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static int sha3_384_init(struct shash_desc *desc)
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{
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struct sha3_state *sctx = shash_desc_ctx(desc);
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sha3_init(sctx, SHA3_384_DIGEST_SIZE);
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return 0;
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}
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static int sha3_512_init(struct shash_desc *desc)
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{
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struct sha3_state *sctx = shash_desc_ctx(desc);
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sha3_init(sctx, SHA3_512_DIGEST_SIZE);
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return 0;
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}
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static int sha3_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha3_state *sctx = shash_desc_ctx(desc);
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unsigned int done;
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const u8 *src;
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done = 0;
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src = data;
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if ((sctx->partial + len) > (sctx->rsiz - 1)) {
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if (sctx->partial) {
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done = -sctx->partial;
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memcpy(sctx->buf + sctx->partial, data,
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done + sctx->rsiz);
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src = sctx->buf;
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}
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do {
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unsigned int i;
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for (i = 0; i < sctx->rsizw; i++)
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sctx->st[i] ^= ((u64 *) src)[i];
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keccakf(sctx->st);
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done += sctx->rsiz;
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src = data + done;
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} while (done + (sctx->rsiz - 1) < len);
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sctx->partial = 0;
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}
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memcpy(sctx->buf + sctx->partial, src, len - done);
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sctx->partial += (len - done);
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return 0;
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}
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static int sha3_final(struct shash_desc *desc, u8 *out)
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{
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struct sha3_state *sctx = shash_desc_ctx(desc);
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unsigned int i, inlen = sctx->partial;
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sctx->buf[inlen++] = 0x06;
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memset(sctx->buf + inlen, 0, sctx->rsiz - inlen);
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sctx->buf[sctx->rsiz - 1] |= 0x80;
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for (i = 0; i < sctx->rsizw; i++)
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sctx->st[i] ^= ((u64 *) sctx->buf)[i];
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keccakf(sctx->st);
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for (i = 0; i < sctx->rsizw; i++)
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sctx->st[i] = cpu_to_le64(sctx->st[i]);
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memcpy(out, sctx->st, sctx->md_len);
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memset(sctx, 0, sizeof(*sctx));
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return 0;
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}
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static struct shash_alg sha3_224 = {
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.digestsize = SHA3_224_DIGEST_SIZE,
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.init = sha3_224_init,
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.update = sha3_update,
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.final = sha3_final,
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.descsize = sizeof(struct sha3_state),
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.base = {
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.cra_name = "sha3-224",
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.cra_driver_name = "sha3-224-generic",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA3_224_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static struct shash_alg sha3_256 = {
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.digestsize = SHA3_256_DIGEST_SIZE,
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.init = sha3_256_init,
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.update = sha3_update,
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.final = sha3_final,
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.descsize = sizeof(struct sha3_state),
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.base = {
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.cra_name = "sha3-256",
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.cra_driver_name = "sha3-256-generic",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA3_256_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static struct shash_alg sha3_384 = {
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.digestsize = SHA3_384_DIGEST_SIZE,
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.init = sha3_384_init,
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.update = sha3_update,
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.final = sha3_final,
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.descsize = sizeof(struct sha3_state),
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.base = {
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.cra_name = "sha3-384",
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.cra_driver_name = "sha3-384-generic",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA3_384_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static struct shash_alg sha3_512 = {
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.digestsize = SHA3_512_DIGEST_SIZE,
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.init = sha3_512_init,
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.update = sha3_update,
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.final = sha3_final,
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.descsize = sizeof(struct sha3_state),
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.base = {
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.cra_name = "sha3-512",
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.cra_driver_name = "sha3-512-generic",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA3_512_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init sha3_generic_mod_init(void)
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{
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int ret;
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ret = crypto_register_shash(&sha3_224);
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if (ret < 0)
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goto err_out;
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ret = crypto_register_shash(&sha3_256);
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if (ret < 0)
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goto err_out_224;
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ret = crypto_register_shash(&sha3_384);
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if (ret < 0)
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goto err_out_256;
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ret = crypto_register_shash(&sha3_512);
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if (ret < 0)
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goto err_out_384;
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return 0;
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err_out_384:
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crypto_unregister_shash(&sha3_384);
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err_out_256:
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crypto_unregister_shash(&sha3_256);
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err_out_224:
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crypto_unregister_shash(&sha3_224);
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err_out:
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return ret;
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}
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static void __exit sha3_generic_mod_fini(void)
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{
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crypto_unregister_shash(&sha3_224);
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crypto_unregister_shash(&sha3_256);
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crypto_unregister_shash(&sha3_384);
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crypto_unregister_shash(&sha3_512);
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}
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module_init(sha3_generic_mod_init);
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module_exit(sha3_generic_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA-3 Secure Hash Algorithm");
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MODULE_ALIAS_CRYPTO("sha3-224");
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MODULE_ALIAS_CRYPTO("sha3-224-generic");
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MODULE_ALIAS_CRYPTO("sha3-256");
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MODULE_ALIAS_CRYPTO("sha3-256-generic");
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MODULE_ALIAS_CRYPTO("sha3-384");
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MODULE_ALIAS_CRYPTO("sha3-384-generic");
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MODULE_ALIAS_CRYPTO("sha3-512");
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MODULE_ALIAS_CRYPTO("sha3-512-generic");
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