152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
/*
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* Cryptographic API.
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*
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* s390 implementation of the SHA256 Secure Hash Algorithm.
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*
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* s390 Version:
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* Copyright (C) 2005 IBM Deutschland GmbH, IBM Corporation
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* Author(s): Jan Glauber (jang@de.ibm.com)
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*
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* Derived from "crypto/sha256.c"
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* and "arch/s390/crypto/sha1_s390.c"
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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/crypto.h>
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#include "crypt_s390.h"
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#define SHA256_DIGEST_SIZE 32
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#define SHA256_BLOCK_SIZE 64
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struct s390_sha256_ctx {
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u64 count;
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u32 state[8];
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u8 buf[2 * SHA256_BLOCK_SIZE];
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};
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static void sha256_init(void *ctx)
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{
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struct s390_sha256_ctx *sctx = ctx;
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sctx->state[0] = 0x6a09e667;
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sctx->state[1] = 0xbb67ae85;
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sctx->state[2] = 0x3c6ef372;
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sctx->state[3] = 0xa54ff53a;
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sctx->state[4] = 0x510e527f;
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sctx->state[5] = 0x9b05688c;
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sctx->state[6] = 0x1f83d9ab;
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sctx->state[7] = 0x5be0cd19;
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sctx->count = 0;
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memset(sctx->buf, 0, sizeof(sctx->buf));
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}
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static void sha256_update(void *ctx, const u8 *data, unsigned int len)
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{
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struct s390_sha256_ctx *sctx = ctx;
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unsigned int index;
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/* how much is already in the buffer? */
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index = sctx->count / 8 & 0x3f;
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/* update message bit length */
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sctx->count += len * 8;
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/* process one block */
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if ((index + len) >= SHA256_BLOCK_SIZE) {
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memcpy(sctx->buf + index, data, SHA256_BLOCK_SIZE - index);
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crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
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SHA256_BLOCK_SIZE);
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data += SHA256_BLOCK_SIZE - index;
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len -= SHA256_BLOCK_SIZE - index;
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}
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/* anything left? */
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if (len)
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memcpy(sctx->buf + index , data, len);
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}
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static void pad_message(struct s390_sha256_ctx* sctx)
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{
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int index, end;
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index = sctx->count / 8 & 0x3f;
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end = index < 56 ? SHA256_BLOCK_SIZE : 2 * SHA256_BLOCK_SIZE;
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/* start pad with 1 */
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sctx->buf[index] = 0x80;
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/* pad with zeros */
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index++;
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memset(sctx->buf + index, 0x00, end - index - 8);
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/* append message length */
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memcpy(sctx->buf + end - 8, &sctx->count, sizeof sctx->count);
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sctx->count = end * 8;
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}
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/* Add padding and return the message digest */
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static void sha256_final(void* ctx, u8 *out)
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{
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struct s390_sha256_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_256, sctx->state, sctx->buf,
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sctx->count / 8);
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/* copy digest to out */
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memcpy(out, sctx->state, SHA256_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 = "sha256",
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
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.cra_blocksize = SHA256_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_sha256_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 = SHA256_DIGEST_SIZE,
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.dia_init = sha256_init,
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.dia_update = sha256_update,
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.dia_final = sha256_final } }
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};
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static int init(void)
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{
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int ret;
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if (!crypt_s390_func_available(KIMD_SHA_256))
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return -ENOSYS;
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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: sha256_s390 couldn't be loaded.");
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return ret;
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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("sha256");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
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