168 lines
3.9 KiB
C
168 lines
3.9 KiB
C
/*
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* Cryptographic API.
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*
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* s390 implementation of the SHA1 Secure Hash Algorithm.
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*
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* Derived from cryptoapi implementation, adapted for in-place
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* scatterlist interface. Originally based on the public domain
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* implementation written by Steve Reid.
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*
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* s390 Version:
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* Copyright (C) 2003 IBM Deutschland GmbH, IBM Corporation
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* Author(s): Thomas Spatzier (tspat@de.ibm.com)
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*
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* Derived from "crypto/sha1.c"
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* Copyright (c) Alan Smithee.
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* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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* Copyright (c) Jean-Francois Dive <jef@linuxbe.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 <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/crypto.h>
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#include <asm/scatterlist.h>
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#include <asm/byteorder.h>
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#include "crypt_s390.h"
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#define SHA1_DIGEST_SIZE 20
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#define SHA1_BLOCK_SIZE 64
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struct crypt_s390_sha1_ctx {
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u64 count;
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u32 state[5];
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u32 buf_len;
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u8 buffer[2 * SHA1_BLOCK_SIZE];
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};
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static void
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sha1_init(void *ctx)
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{
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static const struct crypt_s390_sha1_ctx initstate = {
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.state = {
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0x67452301,
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0xEFCDAB89,
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0x98BADCFE,
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0x10325476,
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0xC3D2E1F0
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},
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};
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memcpy(ctx, &initstate, sizeof(initstate));
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}
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static void
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sha1_update(void *ctx, const u8 *data, unsigned int len)
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{
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struct crypt_s390_sha1_ctx *sctx;
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long imd_len;
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sctx = ctx;
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sctx->count += len * 8; //message bit length
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//anything in buffer yet? -> must be completed
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if (sctx->buf_len && (sctx->buf_len + len) >= SHA1_BLOCK_SIZE) {
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//complete full block and hash
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memcpy(sctx->buffer + sctx->buf_len, data,
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SHA1_BLOCK_SIZE - sctx->buf_len);
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crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer,
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SHA1_BLOCK_SIZE);
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data += SHA1_BLOCK_SIZE - sctx->buf_len;
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len -= SHA1_BLOCK_SIZE - sctx->buf_len;
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sctx->buf_len = 0;
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}
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//rest of data contains full blocks?
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imd_len = len & ~0x3ful;
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if (imd_len){
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crypt_s390_kimd(KIMD_SHA_1, sctx->state, data, imd_len);
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data += imd_len;
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len -= imd_len;
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}
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//anything left? store in buffer
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if (len){
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memcpy(sctx->buffer + sctx->buf_len , data, len);
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sctx->buf_len += len;
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}
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}
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static void
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pad_message(struct crypt_s390_sha1_ctx* sctx)
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{
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int index;
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index = sctx->buf_len;
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sctx->buf_len = (sctx->buf_len < 56)?
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SHA1_BLOCK_SIZE:2 * SHA1_BLOCK_SIZE;
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//start pad with 1
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sctx->buffer[index] = 0x80;
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//pad with zeros
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index++;
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memset(sctx->buffer + index, 0x00, sctx->buf_len - index);
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//append length
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memcpy(sctx->buffer + sctx->buf_len - 8, &sctx->count,
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sizeof sctx->count);
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}
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/* Add padding and return the message digest. */
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static void
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sha1_final(void* ctx, u8 *out)
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{
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struct crypt_s390_sha1_ctx *sctx = ctx;
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//must perform manual padding
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pad_message(sctx);
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crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer, sctx->buf_len);
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//copy digest to out
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memcpy(out, sctx->state, SHA1_DIGEST_SIZE);
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/* Wipe context */
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memset(sctx, 0, sizeof *sctx);
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}
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static struct crypto_alg alg = {
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.cra_name = "sha1",
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
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.cra_blocksize = SHA1_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct crypt_s390_sha1_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(alg.cra_list),
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.cra_u = { .digest = {
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.dia_digestsize = SHA1_DIGEST_SIZE,
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.dia_init = sha1_init,
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.dia_update = sha1_update,
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.dia_final = sha1_final } }
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};
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static int
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init(void)
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{
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int ret = -ENOSYS;
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if (crypt_s390_func_available(KIMD_SHA_1)){
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ret = crypto_register_alg(&alg);
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if (ret == 0){
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printk(KERN_INFO "crypt_s390: sha1_s390 loaded.\n");
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}
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}
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return ret;
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}
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static void __exit
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fini(void)
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{
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crypto_unregister_alg(&alg);
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}
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module_init(init);
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module_exit(fini);
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MODULE_ALIAS("sha1");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
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