mirror of https://gitee.com/openkylin/linux.git
595 lines
16 KiB
C
595 lines
16 KiB
C
/*
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* Cryptographic API.
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*
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* s390 implementation of the DES Cipher Algorithm.
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*
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* Copyright IBM Corp. 2003, 2011
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* Author(s): Thomas Spatzier
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* Jan Glauber (jan.glauber@de.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) 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 <crypto/algapi.h>
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#include <crypto/des.h>
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#include "crypt_s390.h"
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#define DES3_KEY_SIZE (3 * DES_KEY_SIZE)
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static u8 *ctrblk;
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struct s390_des_ctx {
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u8 iv[DES_BLOCK_SIZE];
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u8 key[DES3_KEY_SIZE];
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};
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static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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u32 *flags = &tfm->crt_flags;
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u32 tmp[DES_EXPKEY_WORDS];
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/* check for weak keys */
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if (!des_ekey(tmp, key) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
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*flags |= CRYPTO_TFM_RES_WEAK_KEY;
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return -EINVAL;
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}
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memcpy(ctx->key, key, key_len);
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return 0;
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}
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static void des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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crypt_s390_km(KM_DEA_ENCRYPT, ctx->key, out, in, DES_BLOCK_SIZE);
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}
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static void des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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crypt_s390_km(KM_DEA_DECRYPT, ctx->key, out, in, DES_BLOCK_SIZE);
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}
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static struct crypto_alg des_alg = {
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.cra_name = "des",
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.cra_driver_name = "des-s390",
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.cra_priority = CRYPT_S390_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = DES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_des_ctx),
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.cra_module = THIS_MODULE,
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.cra_u = {
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.cipher = {
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.cia_min_keysize = DES_KEY_SIZE,
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.cia_max_keysize = DES_KEY_SIZE,
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.cia_setkey = des_setkey,
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.cia_encrypt = des_encrypt,
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.cia_decrypt = des_decrypt,
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}
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}
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};
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static int ecb_desall_crypt(struct blkcipher_desc *desc, long func,
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u8 *key, struct blkcipher_walk *walk)
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{
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int ret = blkcipher_walk_virt(desc, walk);
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unsigned int nbytes;
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while ((nbytes = walk->nbytes)) {
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/* only use complete blocks */
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unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
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u8 *out = walk->dst.virt.addr;
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u8 *in = walk->src.virt.addr;
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ret = crypt_s390_km(func, key, out, in, n);
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if (ret < 0 || ret != n)
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return -EIO;
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nbytes &= DES_BLOCK_SIZE - 1;
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ret = blkcipher_walk_done(desc, walk, nbytes);
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}
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return ret;
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}
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static int cbc_desall_crypt(struct blkcipher_desc *desc, long func,
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u8 *iv, struct blkcipher_walk *walk)
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{
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int ret = blkcipher_walk_virt(desc, walk);
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unsigned int nbytes = walk->nbytes;
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if (!nbytes)
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goto out;
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memcpy(iv, walk->iv, DES_BLOCK_SIZE);
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do {
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/* only use complete blocks */
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unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
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u8 *out = walk->dst.virt.addr;
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u8 *in = walk->src.virt.addr;
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ret = crypt_s390_kmc(func, iv, out, in, n);
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if (ret < 0 || ret != n)
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return -EIO;
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nbytes &= DES_BLOCK_SIZE - 1;
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ret = blkcipher_walk_done(desc, walk, nbytes);
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} while ((nbytes = walk->nbytes));
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memcpy(walk->iv, iv, DES_BLOCK_SIZE);
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out:
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return ret;
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}
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static int ecb_des_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_desall_crypt(desc, KM_DEA_ENCRYPT, ctx->key, &walk);
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}
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static int ecb_des_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_desall_crypt(desc, KM_DEA_DECRYPT, ctx->key, &walk);
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}
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static struct crypto_alg ecb_des_alg = {
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.cra_name = "ecb(des)",
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.cra_driver_name = "ecb-des-s390",
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.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = DES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_des_ctx),
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = DES_KEY_SIZE,
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.max_keysize = DES_KEY_SIZE,
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.setkey = des_setkey,
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.encrypt = ecb_des_encrypt,
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.decrypt = ecb_des_decrypt,
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}
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}
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};
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static int cbc_des_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return cbc_desall_crypt(desc, KMC_DEA_ENCRYPT, ctx->iv, &walk);
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}
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static int cbc_des_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return cbc_desall_crypt(desc, KMC_DEA_DECRYPT, ctx->iv, &walk);
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}
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static struct crypto_alg cbc_des_alg = {
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.cra_name = "cbc(des)",
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.cra_driver_name = "cbc-des-s390",
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.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = DES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_des_ctx),
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = DES_KEY_SIZE,
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.max_keysize = DES_KEY_SIZE,
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.ivsize = DES_BLOCK_SIZE,
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.setkey = des_setkey,
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.encrypt = cbc_des_encrypt,
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.decrypt = cbc_des_decrypt,
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}
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}
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};
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/*
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* RFC2451:
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*
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* For DES-EDE3, there is no known need to reject weak or
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* complementation keys. Any weakness is obviated by the use of
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* multiple keys.
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*
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* However, if the first two or last two independent 64-bit keys are
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* equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
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* same as DES. Implementers MUST reject keys that exhibit this
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* property.
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*
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*/
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static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int key_len)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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u32 *flags = &tfm->crt_flags;
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if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
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memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
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DES_KEY_SIZE)) &&
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(*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
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*flags |= CRYPTO_TFM_RES_WEAK_KEY;
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return -EINVAL;
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}
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memcpy(ctx->key, key, key_len);
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return 0;
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}
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static void des3_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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crypt_s390_km(KM_TDEA_192_ENCRYPT, ctx->key, dst, src, DES_BLOCK_SIZE);
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}
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static void des3_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
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crypt_s390_km(KM_TDEA_192_DECRYPT, ctx->key, dst, src, DES_BLOCK_SIZE);
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}
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static struct crypto_alg des3_alg = {
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.cra_name = "des3_ede",
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.cra_driver_name = "des3_ede-s390",
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.cra_priority = CRYPT_S390_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = DES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_des_ctx),
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.cra_module = THIS_MODULE,
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.cra_u = {
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.cipher = {
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.cia_min_keysize = DES3_KEY_SIZE,
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.cia_max_keysize = DES3_KEY_SIZE,
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.cia_setkey = des3_setkey,
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.cia_encrypt = des3_encrypt,
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.cia_decrypt = des3_decrypt,
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}
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}
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};
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static int ecb_des3_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_desall_crypt(desc, KM_TDEA_192_ENCRYPT, ctx->key, &walk);
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}
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static int ecb_des3_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_desall_crypt(desc, KM_TDEA_192_DECRYPT, ctx->key, &walk);
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}
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static struct crypto_alg ecb_des3_alg = {
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.cra_name = "ecb(des3_ede)",
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.cra_driver_name = "ecb-des3_ede-s390",
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.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = DES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_des_ctx),
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = DES3_KEY_SIZE,
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.max_keysize = DES3_KEY_SIZE,
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.setkey = des3_setkey,
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.encrypt = ecb_des3_encrypt,
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.decrypt = ecb_des3_decrypt,
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}
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}
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};
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static int cbc_des3_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, ctx->iv, &walk);
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}
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static int cbc_des3_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, ctx->iv, &walk);
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}
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static struct crypto_alg cbc_des3_alg = {
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.cra_name = "cbc(des3_ede)",
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.cra_driver_name = "cbc-des3_ede-s390",
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.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = DES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_des_ctx),
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = DES3_KEY_SIZE,
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.max_keysize = DES3_KEY_SIZE,
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.ivsize = DES_BLOCK_SIZE,
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.setkey = des3_setkey,
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.encrypt = cbc_des3_encrypt,
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.decrypt = cbc_des3_decrypt,
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}
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}
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};
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static int ctr_desall_crypt(struct blkcipher_desc *desc, long func,
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struct s390_des_ctx *ctx, struct blkcipher_walk *walk)
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{
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int ret = blkcipher_walk_virt_block(desc, walk, DES_BLOCK_SIZE);
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unsigned int i, n, nbytes;
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u8 buf[DES_BLOCK_SIZE];
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u8 *out, *in;
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memcpy(ctrblk, walk->iv, DES_BLOCK_SIZE);
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while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
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out = walk->dst.virt.addr;
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in = walk->src.virt.addr;
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while (nbytes >= DES_BLOCK_SIZE) {
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/* align to block size, max. PAGE_SIZE */
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n = (nbytes > PAGE_SIZE) ? PAGE_SIZE :
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nbytes & ~(DES_BLOCK_SIZE - 1);
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for (i = DES_BLOCK_SIZE; i < n; i += DES_BLOCK_SIZE) {
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memcpy(ctrblk + i, ctrblk + i - DES_BLOCK_SIZE,
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DES_BLOCK_SIZE);
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crypto_inc(ctrblk + i, DES_BLOCK_SIZE);
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}
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ret = crypt_s390_kmctr(func, ctx->key, out, in, n, ctrblk);
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if (ret < 0 || ret != n)
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return -EIO;
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if (n > DES_BLOCK_SIZE)
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memcpy(ctrblk, ctrblk + n - DES_BLOCK_SIZE,
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DES_BLOCK_SIZE);
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crypto_inc(ctrblk, DES_BLOCK_SIZE);
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out += n;
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in += n;
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nbytes -= n;
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}
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ret = blkcipher_walk_done(desc, walk, nbytes);
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}
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/* final block may be < DES_BLOCK_SIZE, copy only nbytes */
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if (nbytes) {
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out = walk->dst.virt.addr;
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in = walk->src.virt.addr;
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ret = crypt_s390_kmctr(func, ctx->key, buf, in,
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DES_BLOCK_SIZE, ctrblk);
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if (ret < 0 || ret != DES_BLOCK_SIZE)
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return -EIO;
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memcpy(out, buf, nbytes);
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crypto_inc(ctrblk, DES_BLOCK_SIZE);
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ret = blkcipher_walk_done(desc, walk, 0);
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}
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memcpy(walk->iv, ctrblk, DES_BLOCK_SIZE);
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return ret;
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}
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static int ctr_des_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ctr_desall_crypt(desc, KMCTR_DEA_ENCRYPT, ctx, &walk);
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}
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static int ctr_des_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ctr_desall_crypt(desc, KMCTR_DEA_DECRYPT, ctx, &walk);
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}
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static struct crypto_alg ctr_des_alg = {
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.cra_name = "ctr(des)",
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.cra_driver_name = "ctr-des-s390",
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.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct s390_des_ctx),
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_u = {
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.blkcipher = {
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.min_keysize = DES_KEY_SIZE,
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.max_keysize = DES_KEY_SIZE,
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.ivsize = DES_BLOCK_SIZE,
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.setkey = des_setkey,
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.encrypt = ctr_des_encrypt,
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.decrypt = ctr_des_decrypt,
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}
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}
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};
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static int ctr_des3_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return ctr_desall_crypt(desc, KMCTR_TDEA_192_ENCRYPT, ctx, &walk);
|
|
}
|
|
|
|
static int ctr_des3_decrypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst, struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct blkcipher_walk walk;
|
|
|
|
blkcipher_walk_init(&walk, dst, src, nbytes);
|
|
return ctr_desall_crypt(desc, KMCTR_TDEA_192_DECRYPT, ctx, &walk);
|
|
}
|
|
|
|
static struct crypto_alg ctr_des3_alg = {
|
|
.cra_name = "ctr(des3_ede)",
|
|
.cra_driver_name = "ctr-des3_ede-s390",
|
|
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct s390_des_ctx),
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = DES3_KEY_SIZE,
|
|
.max_keysize = DES3_KEY_SIZE,
|
|
.ivsize = DES_BLOCK_SIZE,
|
|
.setkey = des3_setkey,
|
|
.encrypt = ctr_des3_encrypt,
|
|
.decrypt = ctr_des3_decrypt,
|
|
}
|
|
}
|
|
};
|
|
|
|
static int __init des_s390_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!crypt_s390_func_available(KM_DEA_ENCRYPT, CRYPT_S390_MSA) ||
|
|
!crypt_s390_func_available(KM_TDEA_192_ENCRYPT, CRYPT_S390_MSA))
|
|
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_alg);
|
|
if (ret)
|
|
goto des3_err;
|
|
ret = crypto_register_alg(&ecb_des3_alg);
|
|
if (ret)
|
|
goto ecb_des3_err;
|
|
ret = crypto_register_alg(&cbc_des3_alg);
|
|
if (ret)
|
|
goto cbc_des3_err;
|
|
|
|
if (crypt_s390_func_available(KMCTR_DEA_ENCRYPT,
|
|
CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
|
|
crypt_s390_func_available(KMCTR_TDEA_192_ENCRYPT,
|
|
CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
|
|
ret = crypto_register_alg(&ctr_des_alg);
|
|
if (ret)
|
|
goto ctr_des_err;
|
|
ret = crypto_register_alg(&ctr_des3_alg);
|
|
if (ret)
|
|
goto ctr_des3_err;
|
|
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
|
|
if (!ctrblk) {
|
|
ret = -ENOMEM;
|
|
goto ctr_mem_err;
|
|
}
|
|
}
|
|
out:
|
|
return ret;
|
|
|
|
ctr_mem_err:
|
|
crypto_unregister_alg(&ctr_des3_alg);
|
|
ctr_des3_err:
|
|
crypto_unregister_alg(&ctr_des_alg);
|
|
ctr_des_err:
|
|
crypto_unregister_alg(&cbc_des3_alg);
|
|
cbc_des3_err:
|
|
crypto_unregister_alg(&ecb_des3_alg);
|
|
ecb_des3_err:
|
|
crypto_unregister_alg(&des3_alg);
|
|
des3_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 des_s390_exit(void)
|
|
{
|
|
if (ctrblk) {
|
|
crypto_unregister_alg(&ctr_des_alg);
|
|
crypto_unregister_alg(&ctr_des3_alg);
|
|
free_page((unsigned long) ctrblk);
|
|
}
|
|
crypto_unregister_alg(&cbc_des3_alg);
|
|
crypto_unregister_alg(&ecb_des3_alg);
|
|
crypto_unregister_alg(&des3_alg);
|
|
crypto_unregister_alg(&cbc_des_alg);
|
|
crypto_unregister_alg(&ecb_des_alg);
|
|
crypto_unregister_alg(&des_alg);
|
|
}
|
|
|
|
module_init(des_s390_init);
|
|
module_exit(des_s390_exit);
|
|
|
|
MODULE_ALIAS("des");
|
|
MODULE_ALIAS("des3_ede");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
|