* Copyright IBM Corp. 2005,2007
* Author(s): Jan Glauber (jang@de.ibm.com)
*
- * Derived from "crypto/sha256.c"
+ * Derived from "crypto/sha256_generic.c"
* and "arch/s390/crypto/sha1_s390.c"
*
* This program is free software; you can redistribute it and/or modify it
#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
+#include <crypto/sha.h>
#include "crypt_s390.h"
-
-#define SHA256_DIGEST_SIZE 32
-#define SHA256_BLOCK_SIZE 64
-
-struct s390_sha256_ctx {
- u64 count;
- u32 state[8];
- u8 buf[2 * SHA256_BLOCK_SIZE];
-};
+#include "sha.h"
static void sha256_init(struct crypto_tfm *tfm)
{
- struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
-
- sctx->state[0] = 0x6a09e667;
- sctx->state[1] = 0xbb67ae85;
- sctx->state[2] = 0x3c6ef372;
- sctx->state[3] = 0xa54ff53a;
- sctx->state[4] = 0x510e527f;
- sctx->state[5] = 0x9b05688c;
- sctx->state[6] = 0x1f83d9ab;
- sctx->state[7] = 0x5be0cd19;
+ struct s390_sha_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ sctx->state[0] = SHA256_H0;
+ sctx->state[1] = SHA256_H1;
+ sctx->state[2] = SHA256_H2;
+ sctx->state[3] = SHA256_H3;
+ sctx->state[4] = SHA256_H4;
+ sctx->state[5] = SHA256_H5;
+ sctx->state[6] = SHA256_H6;
+ sctx->state[7] = SHA256_H7;
sctx->count = 0;
-}
-
-static void sha256_update(struct crypto_tfm *tfm, const u8 *data,
- unsigned int len)
-{
- struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
- unsigned int index;
- int ret;
-
- /* how much is already in the buffer? */
- index = sctx->count / 8 & 0x3f;
-
- /* update message bit length */
- sctx->count += len * 8;
-
- if ((index + len) < SHA256_BLOCK_SIZE)
- goto store;
-
- /* process one stored block */
- if (index) {
- memcpy(sctx->buf + index, data, SHA256_BLOCK_SIZE - index);
- ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
- SHA256_BLOCK_SIZE);
- BUG_ON(ret != SHA256_BLOCK_SIZE);
- data += SHA256_BLOCK_SIZE - index;
- len -= SHA256_BLOCK_SIZE - index;
- }
-
- /* process as many blocks as possible */
- if (len >= SHA256_BLOCK_SIZE) {
- ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, data,
- len & ~(SHA256_BLOCK_SIZE - 1));
- BUG_ON(ret != (len & ~(SHA256_BLOCK_SIZE - 1)));
- data += ret;
- len -= ret;
- }
-
-store:
- /* anything left? */
- if (len)
- memcpy(sctx->buf + index , data, len);
-}
-
-static void pad_message(struct s390_sha256_ctx* sctx)
-{
- int index, end;
-
- index = sctx->count / 8 & 0x3f;
- end = index < 56 ? SHA256_BLOCK_SIZE : 2 * SHA256_BLOCK_SIZE;
-
- /* start pad with 1 */
- sctx->buf[index] = 0x80;
-
- /* pad with zeros */
- index++;
- memset(sctx->buf + index, 0x00, end - index - 8);
-
- /* append message length */
- memcpy(sctx->buf + end - 8, &sctx->count, sizeof sctx->count);
-
- sctx->count = end * 8;
-}
-
-/* Add padding and return the message digest */
-static void sha256_final(struct crypto_tfm *tfm, u8 *out)
-{
- struct s390_sha256_ctx *sctx = crypto_tfm_ctx(tfm);
-
- /* must perform manual padding */
- pad_message(sctx);
-
- crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf,
- sctx->count / 8);
-
- /* copy digest to out */
- memcpy(out, sctx->state, SHA256_DIGEST_SIZE);
-
- /* wipe context */
- memset(sctx, 0, sizeof *sctx);
+ sctx->func = KIMD_SHA_256;
}
static struct crypto_alg alg = {
.cra_priority = CRYPT_S390_PRIORITY,
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
.cra_blocksize = SHA256_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct s390_sha256_ctx),
+ .cra_ctxsize = sizeof(struct s390_sha_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(alg.cra_list),
.cra_u = { .digest = {
.dia_digestsize = SHA256_DIGEST_SIZE,
.dia_init = sha256_init,
- .dia_update = sha256_update,
- .dia_final = sha256_final } }
+ .dia_update = s390_sha_update,
+ .dia_final = s390_sha_final } }
};
-static int init(void)
+static int sha256_s390_init(void)
{
if (!crypt_s390_func_available(KIMD_SHA_256))
return -EOPNOTSUPP;
return crypto_register_alg(&alg);
}
-static void __exit fini(void)
+static void __exit sha256_s390_fini(void)
{
crypto_unregister_alg(&alg);
}
-module_init(init);
-module_exit(fini);
+module_init(sha256_s390_init);
+module_exit(sha256_s390_fini);
MODULE_ALIAS("sha256");
-
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");