mirror of https://gitee.com/openkylin/linux.git
161 lines
4.0 KiB
C
161 lines
4.0 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 IBM Corp. 2003,2007
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* Author(s): Thomas Spatzier
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* Jan Glauber (jan.glauber@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 sha1_init(struct crypto_tfm *tfm)
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{
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struct crypt_s390_sha1_ctx *ctx = crypto_tfm_ctx(tfm);
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xEFCDAB89;
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ctx->state[2] = 0x98BADCFE;
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ctx->state[3] = 0x10325476;
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ctx->state[4] = 0xC3D2E1F0;
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ctx->count = 0;
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ctx->buf_len = 0;
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}
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static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
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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 = crypto_tfm_ctx(tfm);
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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 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 sha1_final(struct crypto_tfm *tfm, u8 *out)
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{
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struct crypt_s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
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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_driver_name= "sha1-s390",
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.cra_priority = CRYPT_S390_PRIORITY,
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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 __init init(void)
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{
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if (!crypt_s390_func_available(KIMD_SHA_1))
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return -EOPNOTSUPP;
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return crypto_register_alg(&alg);
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}
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static void __exit 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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