* implementation written by Steve Reid.
*
* s390 Version:
- * Copyright (C) 2003 IBM Deutschland GmbH, IBM Corporation
- * Author(s): Thomas Spatzier (tspat@de.ibm.com)
+ * 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.
*/
#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;
+struct s390_sha1_ctx {
+ u64 count; /* message length */
u32 state[5];
- u32 buf_len;
- u8 buffer[2 * SHA1_BLOCK_SIZE];
+ u8 buf[2 * SHA1_BLOCK_SIZE];
};
static void sha1_init(struct crypto_tfm *tfm)
{
- struct crypt_s390_sha1_ctx *ctx = crypto_tfm_ctx(tfm);
- static const u32 initstate[5] = {
- 0x67452301,
- 0xEFCDAB89,
- 0x98BADCFE,
- 0x10325476,
- 0xC3D2E1F0
- };
-
- ctx->count = 0;
- memcpy(ctx->state, &initstate, sizeof(initstate));
- ctx->buf_len = 0;
+ struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ sctx->state[0] = 0x67452301;
+ sctx->state[1] = 0xEFCDAB89;
+ sctx->state[2] = 0x98BADCFE;
+ sctx->state[3] = 0x10325476;
+ sctx->state[4] = 0xC3D2E1F0;
+ sctx->count = 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;
+ struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
+ unsigned int index;
+ int ret;
+
+ /* how much is already in the buffer? */
+ index = sctx->count & 0x3f;
+
+ sctx->count += len;
+
+ if (index + len < SHA1_BLOCK_SIZE)
+ goto store;
+
+ /* process one stored block */
+ if (index) {
+ memcpy(sctx->buf + index, data, SHA1_BLOCK_SIZE - index);
+ ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf,
+ SHA1_BLOCK_SIZE);
+ BUG_ON(ret != SHA1_BLOCK_SIZE);
+ data += SHA1_BLOCK_SIZE - index;
+ len -= SHA1_BLOCK_SIZE - index;
}
- //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;
+ /* process as many blocks as possible */
+ if (len >= SHA1_BLOCK_SIZE) {
+ ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, data,
+ len & ~(SHA1_BLOCK_SIZE - 1));
+ BUG_ON(ret != (len & ~(SHA1_BLOCK_SIZE - 1)));
+ data += ret;
+ len -= ret;
}
-}
-
-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);
+store:
+ /* anything left? */
+ if (len)
+ memcpy(sctx->buf + index , data, len);
}
/* 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);
+ struct s390_sha1_ctx *sctx = crypto_tfm_ctx(tfm);
+ u64 bits;
+ unsigned int index, end;
+ int ret;
+
+ /* must perform manual padding */
+ index = sctx->count & 0x3f;
+ end = (index < 56) ? SHA1_BLOCK_SIZE : (2 * SHA1_BLOCK_SIZE);
- //must perform manual padding
- pad_message(sctx);
- crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buffer, sctx->buf_len);
- //copy digest to out
+ /* start pad with 1 */
+ sctx->buf[index] = 0x80;
+
+ /* pad with zeros */
+ index++;
+ memset(sctx->buf + index, 0x00, end - index - 8);
+
+ /* append message length */
+ bits = sctx->count * 8;
+ memcpy(sctx->buf + end - 8, &bits, sizeof(bits));
+
+ ret = crypt_s390_kimd(KIMD_SHA_1, sctx->state, sctx->buf, end);
+ BUG_ON(ret != end);
+
+ /* copy digest to out */
memcpy(out, sctx->state, SHA1_DIGEST_SIZE);
- /* Wipe context */
+
+ /* 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_ctxsize = sizeof(struct s390_sha1_ctx),
.cra_module = THIS_MODULE,
- .cra_list = LIST_HEAD_INIT(alg.cra_list),
+ .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 } }
+ .dia_init = sha1_init,
+ .dia_update = sha1_update,
+ .dia_final = sha1_final } }
};
-static int
-init(void)
+static int __init init(void)
{
- int ret = -ENOSYS;
+ if (!crypt_s390_func_available(KIMD_SHA_1))
+ return -EOPNOTSUPP;
- if (crypt_s390_func_available(KIMD_SHA_1)){
- ret = crypto_register_alg(&alg);
- if (ret == 0){
- printk(KERN_INFO "crypt_s390: sha1_s390 loaded.\n");
- }
- }
- return ret;
+ return crypto_register_alg(&alg);
}
-static void __exit
-fini(void)
+static void __exit fini(void)
{
crypto_unregister_alg(&alg);
}