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- /*
- * Cryptographic API.
- *
- * s390 implementation of the SHA1 Secure Hash Algorithm.
- *
- * Derived from cryptoapi implementation, adapted for in-place
- * scatterlist interface. Originally based on the public domain
- * implementation written by Steve Reid.
- *
- * s390 Version:
- * Copyright IBM Corp. 2003,2007
- * Author(s): Thomas Spatzier
- * Jan Glauber (jan.glauber@de.ibm.com)
- *
- * Derived from "crypto/sha1.c"
- * Copyright (c) Alan Smithee.
- * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
- * Copyright (c) Jean-Francois Dive <jef@linuxbe.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 <linux/init.h>
- #include <linux/module.h>
- #include <linux/mm.h>
- #include <linux/crypto.h>
- #include <asm/scatterlist.h>
- #include <asm/byteorder.h>
- #include "crypt_s390.h"
- #define SHA1_DIGEST_SIZE 20
- #define SHA1_BLOCK_SIZE 64
- struct crypt_s390_sha1_ctx {
- u64 count;
- u32 state[5];
- u32 buf_len;
- u8 buffer[2 * SHA1_BLOCK_SIZE];
- };
- static void sha1_init(struct crypto_tfm *tfm)
- {
- struct crypt_s390_sha1_ctx *ctx = crypto_tfm_ctx(tfm);
- ctx->state[0] = 0x67452301;
- ctx->state[1] = 0xEFCDAB89;
- ctx->state[2] = 0x98BADCFE;
- ctx->state[3] = 0x10325476;
- ctx->state[4] = 0xC3D2E1F0;
- ctx->count = 0;
- ctx->buf_len = 0;
- }
- static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
- unsigned int len)
- {
- struct crypt_s390_sha1_ctx *sctx;
- long imd_len;
- sctx = crypto_tfm_ctx(tfm);
- sctx->count += len * 8; /* message bit length */
- /* anything in buffer yet? -> must be completed */
- if (sctx->buf_len && (sctx->buf_len + len) >= SHA1_BLOCK_SIZE) {
- /* complete full block and hash */
- memcpy(sctx->buffer + sctx->buf_len, data,
- SHA1_BLOCK_SIZE - sctx->buf_len);
- crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer,
- SHA1_BLOCK_SIZE);
- data += SHA1_BLOCK_SIZE - sctx->buf_len;
- len -= SHA1_BLOCK_SIZE - sctx->buf_len;
- sctx->buf_len = 0;
- }
- /* rest of data contains full blocks? */
- imd_len = len & ~0x3ful;
- if (imd_len) {
- crypt_s390_kimd(KIMD_SHA_1, sctx->state, data, imd_len);
- data += imd_len;
- len -= imd_len;
- }
- /* anything left? store in buffer */
- if (len) {
- memcpy(sctx->buffer + sctx->buf_len , data, len);
- sctx->buf_len += len;
- }
- }
- static void pad_message(struct crypt_s390_sha1_ctx* sctx)
- {
- int index;
- index = sctx->buf_len;
- sctx->buf_len = (sctx->buf_len < 56) ?
- SHA1_BLOCK_SIZE:2 * SHA1_BLOCK_SIZE;
- /* start pad with 1 */
- sctx->buffer[index] = 0x80;
- /* pad with zeros */
- index++;
- memset(sctx->buffer + index, 0x00, sctx->buf_len - index);
- /* append length */
- memcpy(sctx->buffer + sctx->buf_len - 8, &sctx->count,
- sizeof sctx->count);
- }
- /* Add padding and return the message digest. */
- static void sha1_final(struct crypto_tfm *tfm, u8 *out)
- {
- struct crypt_s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
- /* must perform manual padding */
- pad_message(sctx);
- crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer, sctx->buf_len);
- /* copy digest to out */
- memcpy(out, sctx->state, SHA1_DIGEST_SIZE);
- /* wipe context */
- memset(sctx, 0, sizeof *sctx);
- }
- static struct crypto_alg alg = {
- .cra_name = "sha1",
- .cra_driver_name= "sha1-s390",
- .cra_priority = CRYPT_S390_PRIORITY,
- .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
- .cra_blocksize = SHA1_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct crypt_s390_sha1_ctx),
- .cra_module = THIS_MODULE,
- .cra_list = LIST_HEAD_INIT(alg.cra_list),
- .cra_u = { .digest = {
- .dia_digestsize = SHA1_DIGEST_SIZE,
- .dia_init = sha1_init,
- .dia_update = sha1_update,
- .dia_final = sha1_final } }
- };
- static int __init init(void)
- {
- if (!crypt_s390_func_available(KIMD_SHA_1))
- return -EOPNOTSUPP;
- return crypto_register_alg(&alg);
- }
- static void __exit fini(void)
- {
- crypto_unregister_alg(&alg);
- }
- module_init(init);
- module_exit(fini);
- MODULE_ALIAS("sha1");
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
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