In barebox the function digest_alloc() allocates a digest based on a string. When a subsystem already uses an integer value to identify a digest it makes no sense to create a string and pass it to digest_alloc(), where it is parsed again. This patch adds the possibility to get a digest by an enum. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
216 lines
4.9 KiB
C
216 lines
4.9 KiB
C
/*
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* Glue code for the SHA256 Secure Hash Algorithm assembly implementation
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* using optimized ARM assembler and NEON instructions.
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*
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* Copyright © 2015 Google Inc.
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*
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* This file is based on sha256_ssse3_glue.c:
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* Copyright (C) 2013 Intel Corporation
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* Author: Tim Chen <tim.c.chen@linux.intel.com>
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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 <common.h>
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#include <digest.h>
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#include <init.h>
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#include <crypto/sha.h>
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#include <crypto/internal.h>
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#include <asm/byteorder.h>
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void sha256_block_data_order(u32 *digest, const void *data,
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unsigned int num_blks);
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int sha256_init(struct digest *desc)
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{
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struct sha256_state *sctx = digest_ctx(desc);
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sctx->state[0] = SHA256_H0;
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sctx->state[1] = SHA256_H1;
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sctx->state[2] = SHA256_H2;
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sctx->state[3] = SHA256_H3;
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sctx->state[4] = SHA256_H4;
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sctx->state[5] = SHA256_H5;
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sctx->state[6] = SHA256_H6;
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sctx->state[7] = SHA256_H7;
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sctx->count = 0;
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return 0;
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}
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int sha224_init(struct digest *desc)
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{
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struct sha256_state *sctx = digest_ctx(desc);
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sctx->state[0] = SHA224_H0;
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sctx->state[1] = SHA224_H1;
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sctx->state[2] = SHA224_H2;
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sctx->state[3] = SHA224_H3;
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sctx->state[4] = SHA224_H4;
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sctx->state[5] = SHA224_H5;
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sctx->state[6] = SHA224_H6;
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sctx->state[7] = SHA224_H7;
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sctx->count = 0;
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return 0;
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}
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int __sha256_update(struct digest *desc, const u8 *data, unsigned int len,
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unsigned int partial)
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{
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struct sha256_state *sctx = digest_ctx(desc);
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unsigned int done = 0;
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sctx->count += len;
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if (partial) {
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done = SHA256_BLOCK_SIZE - partial;
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memcpy(sctx->buf + partial, data, done);
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sha256_block_data_order(sctx->state, sctx->buf, 1);
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}
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if (len - done >= SHA256_BLOCK_SIZE) {
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const unsigned int rounds = (len - done) / SHA256_BLOCK_SIZE;
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sha256_block_data_order(sctx->state, data + done, rounds);
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done += rounds * SHA256_BLOCK_SIZE;
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}
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memcpy(sctx->buf, data + done, len - done);
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return 0;
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}
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int sha256_update(struct digest *desc, const void *data,
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unsigned long len)
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{
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struct sha256_state *sctx = digest_ctx(desc);
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unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
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/* Handle the fast case right here */
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if (partial + len < SHA256_BLOCK_SIZE) {
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sctx->count += len;
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memcpy(sctx->buf + partial, data, len);
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return 0;
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}
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return __sha256_update(desc, data, len, partial);
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}
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/* Add padding and return the message digest. */
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static int sha256_final(struct digest *desc, u8 *out)
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{
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struct sha256_state *sctx = digest_ctx(desc);
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unsigned int i, index, padlen;
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__be32 *dst = (__be32 *)out;
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__be64 bits;
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static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
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/* save number of bits */
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bits = cpu_to_be64(sctx->count << 3);
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/* Pad out to 56 mod 64 and append length */
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index = sctx->count % SHA256_BLOCK_SIZE;
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padlen = (index < 56) ? (56 - index) : ((SHA256_BLOCK_SIZE+56)-index);
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/* We need to fill a whole block for __sha256_update */
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if (padlen <= 56) {
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sctx->count += padlen;
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memcpy(sctx->buf + index, padding, padlen);
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} else {
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__sha256_update(desc, padding, padlen, index);
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}
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__sha256_update(desc, (const u8 *)&bits, sizeof(bits), 56);
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/* Store state in digest */
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for (i = 0; i < 8; i++)
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dst[i] = cpu_to_be32(sctx->state[i]);
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/* Wipe context */
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memset(sctx, 0, sizeof(*sctx));
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return 0;
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}
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static int sha224_final(struct digest *desc, u8 *out)
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{
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u8 D[SHA256_DIGEST_SIZE];
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sha256_final(desc, D);
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memcpy(out, D, SHA224_DIGEST_SIZE);
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memset(D, 0, SHA256_DIGEST_SIZE);
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return 0;
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}
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int sha256_export(struct digest *desc, void *out)
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{
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struct sha256_state *sctx = digest_ctx(desc);
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memcpy(out, sctx, sizeof(*sctx));
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return 0;
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}
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int sha256_import(struct digest *desc, const void *in)
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{
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struct sha256_state *sctx = digest_ctx(desc);
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memcpy(sctx, in, sizeof(*sctx));
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return 0;
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}
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static struct digest_algo sha224 = {
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.base = {
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.name = "sha224",
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.driver_name = "sha224-asm",
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.priority = 150,
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.algo = HASH_ALGO_SHA224,
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},
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.length = SHA224_DIGEST_SIZE,
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.init = sha224_init,
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.update = sha256_update,
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.final = sha224_final,
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.digest = digest_generic_digest,
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.verify = digest_generic_verify,
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.ctx_length = sizeof(struct sha256_state),
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};
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static int sha224_digest_register(void)
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{
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return digest_algo_register(&sha224);
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}
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device_initcall(sha224_digest_register);
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static struct digest_algo sha256 = {
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.base = {
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.name = "sha256",
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.driver_name = "sha256-asm",
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.priority = 150,
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.algo = HASH_ALGO_SHA256,
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},
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.length = SHA256_DIGEST_SIZE,
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.init = sha256_init,
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.update = sha256_update,
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.final = sha256_final,
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.digest = digest_generic_digest,
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.verify = digest_generic_verify,
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.ctx_length = sizeof(struct sha256_state),
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};
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static int sha256_digest_register(void)
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{
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return digest_algo_register(&sha256);
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}
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device_initcall(sha256_digest_register);
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