des_s390.c

linux 内核源代码

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return ecb_desall_crypt(desc, KM_TDEA_128_DECRYPT, sctx->key, &walk);
}

static struct crypto_alg ecb_des3_128_alg = {
	.cra_name		=	"ecb(des3_ede128)",
	.cra_driver_name	=	"ecb-des3_ede128-s390",
	.cra_priority		=	CRYPT_S390_COMPOSITE_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	DES3_128_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des3_128_ctx),
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(
						ecb_des3_128_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	DES3_128_KEY_SIZE,
			.max_keysize		=	DES3_128_KEY_SIZE,
			.setkey			=	des3_128_setkey,
			.encrypt		=	ecb_des3_128_encrypt,
			.decrypt		=	ecb_des3_128_decrypt,
		}
	}
};

static int cbc_des3_128_encrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return cbc_desall_crypt(desc, KMC_TDEA_128_ENCRYPT, sctx->iv, &walk);
}

static int cbc_des3_128_decrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return cbc_desall_crypt(desc, KMC_TDEA_128_DECRYPT, sctx->iv, &walk);
}

static struct crypto_alg cbc_des3_128_alg = {
	.cra_name		=	"cbc(des3_ede128)",
	.cra_driver_name	=	"cbc-des3_ede128-s390",
	.cra_priority		=	CRYPT_S390_COMPOSITE_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	DES3_128_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des3_128_ctx),
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(
						cbc_des3_128_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	DES3_128_KEY_SIZE,
			.max_keysize		=	DES3_128_KEY_SIZE,
			.ivsize			=	DES3_128_BLOCK_SIZE,
			.setkey			=	des3_128_setkey,
			.encrypt		=	cbc_des3_128_encrypt,
			.decrypt		=	cbc_des3_128_decrypt,
		}
	}
};

/*
 * RFC2451:
 *
 *   For DES-EDE3, there is no known need to reject weak or
 *   complementation keys.  Any weakness is obviated by the use of
 *   multiple keys.
 *
 *   However, if the first two or last two independent 64-bit keys are
 *   equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
 *   same as DES.  Implementers MUST reject keys that exhibit this
 *   property.
 *
 */
static int des3_192_setkey(struct crypto_tfm *tfm, const u8 *key,
			   unsigned int keylen)
{
	int i, ret;
	struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);
	const u8 *temp_key = key;
	u32 *flags = &tfm->crt_flags;

	if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
	    memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
		   DES_KEY_SIZE))) {

		*flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
		return -EINVAL;
	}
	for (i = 0; i < 3; i++, temp_key += DES_KEY_SIZE) {
		ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
		if (ret < 0)
			return ret;
	}
	memcpy(dctx->key, key, keylen);
	return 0;
}

static void des3_192_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);

	crypt_s390_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src,
		      DES3_192_BLOCK_SIZE);
}

static void des3_192_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);

	crypt_s390_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src,
		      DES3_192_BLOCK_SIZE);
}

static struct crypto_alg des3_192_alg = {
	.cra_name		=	"des3_ede",
	.cra_driver_name	=	"des3_ede-s390",
	.cra_priority		=	CRYPT_S390_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize		=	DES3_192_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des3_192_ctx),
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(des3_192_alg.cra_list),
	.cra_u			=	{
		.cipher = {
			.cia_min_keysize	=	DES3_192_KEY_SIZE,
			.cia_max_keysize	=	DES3_192_KEY_SIZE,
			.cia_setkey		=	des3_192_setkey,
			.cia_encrypt		=	des3_192_encrypt,
			.cia_decrypt		=	des3_192_decrypt,
		}
	}
};

static int ecb_des3_192_encrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return ecb_desall_crypt(desc, KM_TDEA_192_ENCRYPT, sctx->key, &walk);
}

static int ecb_des3_192_decrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return ecb_desall_crypt(desc, KM_TDEA_192_DECRYPT, sctx->key, &walk);
}

static struct crypto_alg ecb_des3_192_alg = {
	.cra_name		=	"ecb(des3_ede)",
	.cra_driver_name	=	"ecb-des3_ede-s390",
	.cra_priority		=	CRYPT_S390_COMPOSITE_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	DES3_192_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des3_192_ctx),
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(
						ecb_des3_192_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	DES3_192_KEY_SIZE,
			.max_keysize		=	DES3_192_KEY_SIZE,
			.setkey			=	des3_192_setkey,
			.encrypt		=	ecb_des3_192_encrypt,
			.decrypt		=	ecb_des3_192_decrypt,
		}
	}
};

static int cbc_des3_192_encrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, sctx->iv, &walk);
}

static int cbc_des3_192_decrypt(struct blkcipher_desc *desc,
				struct scatterlist *dst,
				struct scatterlist *src, unsigned int nbytes)
{
	struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
	struct blkcipher_walk walk;

	blkcipher_walk_init(&walk, dst, src, nbytes);
	return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, sctx->iv, &walk);
}

static struct crypto_alg cbc_des3_192_alg = {
	.cra_name		=	"cbc(des3_ede)",
	.cra_driver_name	=	"cbc-des3_ede-s390",
	.cra_priority		=	CRYPT_S390_COMPOSITE_PRIORITY,
	.cra_flags		=	CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize		=	DES3_192_BLOCK_SIZE,
	.cra_ctxsize		=	sizeof(struct crypt_s390_des3_192_ctx),
	.cra_type		=	&crypto_blkcipher_type,
	.cra_module		=	THIS_MODULE,
	.cra_list		=	LIST_HEAD_INIT(
						cbc_des3_192_alg.cra_list),
	.cra_u			=	{
		.blkcipher = {
			.min_keysize		=	DES3_192_KEY_SIZE,
			.max_keysize		=	DES3_192_KEY_SIZE,
			.ivsize			=	DES3_192_BLOCK_SIZE,
			.setkey			=	des3_192_setkey,
			.encrypt		=	cbc_des3_192_encrypt,
			.decrypt		=	cbc_des3_192_decrypt,
		}
	}
};

static int init(void)
{
	int ret = 0;

	if (!crypt_s390_func_available(KM_DEA_ENCRYPT) ||
	    !crypt_s390_func_available(KM_TDEA_128_ENCRYPT) ||
	    !crypt_s390_func_available(KM_TDEA_192_ENCRYPT))
		return -EOPNOTSUPP;

	ret = crypto_register_alg(&des_alg);
	if (ret)
		goto des_err;
	ret = crypto_register_alg(&ecb_des_alg);
	if (ret)
		goto ecb_des_err;
	ret = crypto_register_alg(&cbc_des_alg);
	if (ret)
		goto cbc_des_err;

	ret = crypto_register_alg(&des3_128_alg);
	if (ret)
		goto des3_128_err;
	ret = crypto_register_alg(&ecb_des3_128_alg);
	if (ret)
		goto ecb_des3_128_err;
	ret = crypto_register_alg(&cbc_des3_128_alg);
	if (ret)
		goto cbc_des3_128_err;

	ret = crypto_register_alg(&des3_192_alg);
	if (ret)
		goto des3_192_err;
	ret = crypto_register_alg(&ecb_des3_192_alg);
	if (ret)
		goto ecb_des3_192_err;
	ret = crypto_register_alg(&cbc_des3_192_alg);
	if (ret)
		goto cbc_des3_192_err;

out:
	return ret;

cbc_des3_192_err:
	crypto_unregister_alg(&ecb_des3_192_alg);
ecb_des3_192_err:
	crypto_unregister_alg(&des3_192_alg);
des3_192_err:
	crypto_unregister_alg(&cbc_des3_128_alg);
cbc_des3_128_err:
	crypto_unregister_alg(&ecb_des3_128_alg);
ecb_des3_128_err:
	crypto_unregister_alg(&des3_128_alg);
des3_128_err:
	crypto_unregister_alg(&cbc_des_alg);
cbc_des_err:
	crypto_unregister_alg(&ecb_des_alg);
ecb_des_err:
	crypto_unregister_alg(&des_alg);
des_err:
	goto out;
}

static void __exit fini(void)
{
	crypto_unregister_alg(&cbc_des3_192_alg);
	crypto_unregister_alg(&ecb_des3_192_alg);
	crypto_unregister_alg(&des3_192_alg);
	crypto_unregister_alg(&cbc_des3_128_alg);
	crypto_unregister_alg(&ecb_des3_128_alg);
	crypto_unregister_alg(&des3_128_alg);
	crypto_unregister_alg(&cbc_des_alg);
	crypto_unregister_alg(&ecb_des_alg);
	crypto_unregister_alg(&des_alg);
}

module_init(init);
module_exit(fini);

MODULE_ALIAS("des");
MODULE_ALIAS("des3_ede");

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");