| /* |
| * Cryptographic API. |
| * |
| * s390 implementation of the SHA256 Secure Hash Algorithm. |
| * |
| * s390 Version: |
| * Copyright IBM Corp. 2005,2007 |
| * Author(s): Jan Glauber (jang@de.ibm.com) |
| * |
| * 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 |
| * 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/crypto.h> |
| #include <crypto/sha.h> |
| |
| #include "crypt_s390.h" |
| |
| struct s390_sha256_ctx { |
| u64 count; /* message length */ |
| u32 state[8]; |
| u8 buf[2 * SHA256_BLOCK_SIZE]; |
| }; |
| |
| static void sha256_init(struct crypto_tfm *tfm) |
| { |
| struct s390_sha256_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 & 0x3f; |
| |
| sctx->count += len; |
| |
| 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); |
| } |
| |
| /* 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); |
| u64 bits; |
| unsigned int index, end; |
| int ret; |
| |
| /* must perform manual padding */ |
| index = sctx->count & 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 */ |
| bits = sctx->count * 8; |
| memcpy(sctx->buf + end - 8, &bits, sizeof(bits)); |
| |
| ret = crypt_s390_kimd(KIMD_SHA_256, sctx->state, sctx->buf, end); |
| BUG_ON(ret != end); |
| |
| /* copy digest to out */ |
| memcpy(out, sctx->state, SHA256_DIGEST_SIZE); |
| |
| /* wipe context */ |
| memset(sctx, 0, sizeof *sctx); |
| } |
| |
| static struct crypto_alg alg = { |
| .cra_name = "sha256", |
| .cra_driver_name = "sha256-s390", |
| .cra_priority = CRYPT_S390_PRIORITY, |
| .cra_flags = CRYPTO_ALG_TYPE_DIGEST, |
| .cra_blocksize = SHA256_BLOCK_SIZE, |
| .cra_ctxsize = sizeof(struct s390_sha256_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 } } |
| }; |
| |
| static int sha256_s390_init(void) |
| { |
| if (!crypt_s390_func_available(KIMD_SHA_256)) |
| return -EOPNOTSUPP; |
| |
| return crypto_register_alg(&alg); |
| } |
| |
| static void __exit sha256_s390_fini(void) |
| { |
| crypto_unregister_alg(&alg); |
| } |
| |
| module_init(sha256_s390_init); |
| module_exit(sha256_s390_fini); |
| |
| MODULE_ALIAS("sha256"); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm"); |