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linux/arch/s390/crypto/des_s390.c
Eric Biggers 231baecdef crypto: clarify name of WEAK_KEY request flag 
CRYPTO_TFM_REQ_WEAK_KEY confuses newcomers to the crypto API because it
sounds like it is requesting a weak key.  Actually, it is requesting
that weak keys be forbidden (for algorithms that have the notion of
"weak keys"; currently only DES and XTS do).

Also it is only one letter away from CRYPTO_TFM_RES_WEAK_KEY, with which
it can be easily confused.  (This in fact happened in the UX500 driver,
though just in some debugging messages.)

Therefore, make the intent clear by renaming it to
CRYPTO_TFM_REQ_FORBID_WEAK_KEYS.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-01-25 18:41:52 +08:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Cryptographic API.
*
* s390 implementation of the DES Cipher Algorithm.
*
* Copyright IBM Corp. 2003, 2011
* Author(s): Thomas Spatzier
* Jan Glauber (jan.glauber@de.ibm.com)
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/cpufeature.h>
#include <linux/crypto.h>
#include <linux/fips.h>
#include <crypto/algapi.h>
#include <crypto/des.h>
#include <asm/cpacf.h>
#define DES3_KEY_SIZE (3 * DES_KEY_SIZE)
static u8 *ctrblk;
static DEFINE_SPINLOCK(ctrblk_lock);
static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
struct s390_des_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_KEY_SIZE];
};
static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int key_len)
{
struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
u32 tmp[DES_EXPKEY_WORDS];
/* check for weak keys */
if (!des_ekey(tmp, key) &&
(tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
memcpy(ctx->key, key, key_len);
return 0;
}
static void des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
cpacf_km(CPACF_KM_DEA, ctx->key, out, in, DES_BLOCK_SIZE);
}
static void des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
cpacf_km(CPACF_KM_DEA | CPACF_DECRYPT,
ctx->key, out, in, DES_BLOCK_SIZE);
}
static struct crypto_alg des_alg = {
.cra_name = "des",
.cra_driver_name = "des-s390",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_des_ctx),
.cra_module = THIS_MODULE,
.cra_u = {
.cipher = {
.cia_min_keysize = DES_KEY_SIZE,
.cia_max_keysize = DES_KEY_SIZE,
.cia_setkey = des_setkey,
.cia_encrypt = des_encrypt,
.cia_decrypt = des_decrypt,
}
}
};
static int ecb_desall_crypt(struct blkcipher_desc *desc, unsigned long fc,
struct blkcipher_walk *walk)
{
struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
unsigned int nbytes, n;
int ret;
ret = blkcipher_walk_virt(desc, walk);
while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
/* only use complete blocks */
n = nbytes & ~(DES_BLOCK_SIZE - 1);
cpacf_km(fc, ctx->key, walk->dst.virt.addr,
walk->src.virt.addr, n);
ret = blkcipher_walk_done(desc, walk, nbytes - n);
}
return ret;
}
static int cbc_desall_crypt(struct blkcipher_desc *desc, unsigned long fc,
struct blkcipher_walk *walk)
{
struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
unsigned int nbytes, n;
int ret;
struct {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_KEY_SIZE];
} param;
ret = blkcipher_walk_virt(desc, walk);
memcpy(param.iv, walk->iv, DES_BLOCK_SIZE);
memcpy(param.key, ctx->key, DES3_KEY_SIZE);
while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
/* only use complete blocks */
n = nbytes & ~(DES_BLOCK_SIZE - 1);
cpacf_kmc(fc, &param, walk->dst.virt.addr,
walk->src.virt.addr, n);
ret = blkcipher_walk_done(desc, walk, nbytes - n);
}
memcpy(walk->iv, param.iv, DES_BLOCK_SIZE);
return ret;
}
static int ecb_des_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, CPACF_KM_DEA, &walk);
}
static int ecb_des_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, CPACF_KM_DEA | CPACF_DECRYPT, &walk);
}
static struct crypto_alg ecb_des_alg = {
.cra_name = "ecb(des)",
.cra_driver_name = "ecb-des-s390",
.cra_priority = 400, /* combo: des + ecb */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_des_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.setkey = des_setkey,
.encrypt = ecb_des_encrypt,
.decrypt = ecb_des_decrypt,
}
}
};
static int cbc_des_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, CPACF_KMC_DEA, &walk);
}
static int cbc_des_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, CPACF_KMC_DEA | CPACF_DECRYPT, &walk);
}
static struct crypto_alg cbc_des_alg = {
.cra_name = "cbc(des)",
.cra_driver_name = "cbc-des-s390",
.cra_priority = 400, /* combo: des + cbc */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_des_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_u = {
.blkcipher = {
.min_keysize = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = des_setkey,
.encrypt = cbc_des_encrypt,
.decrypt = cbc_des_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.
*
* In fips mode additinally check for all 3 keys are unique.
*
*/
static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int key_len)
{
struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
if (!(crypto_memneq(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
crypto_memneq(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
DES_KEY_SIZE)) &&
(tfm->crt_flags & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
/* in fips mode, ensure k1 != k2 and k2 != k3 and k1 != k3 */
if (fips_enabled &&
!(crypto_memneq(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
crypto_memneq(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
DES_KEY_SIZE) &&
crypto_memneq(key, &key[DES_KEY_SIZE * 2], DES_KEY_SIZE))) {
tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
return -EINVAL;
}
memcpy(ctx->key, key, key_len);
return 0;
}
static void des3_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
cpacf_km(CPACF_KM_TDEA_192, ctx->key, dst, src, DES_BLOCK_SIZE);
}
static void des3_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
cpacf_km(CPACF_KM_TDEA_192 | CPACF_DECRYPT,
ctx->key, dst, src, DES_BLOCK_SIZE);
}
static struct crypto_alg des3_alg = {
.cra_name = "des3_ede",
.cra_driver_name = "des3_ede-s390",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_des_ctx),
.cra_module = THIS_MODULE,
.cra_u = {
.cipher = {
.cia_min_keysize = DES3_KEY_SIZE,
.cia_max_keysize = DES3_KEY_SIZE,
.cia_setkey = des3_setkey,
.cia_encrypt = des3_encrypt,
.cia_decrypt = des3_decrypt,
}
}
};
static int ecb_des3_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, CPACF_KM_TDEA_192, &walk);
}
static int ecb_des3_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, CPACF_KM_TDEA_192 | CPACF_DECRYPT,
&walk);
}
static struct crypto_alg ecb_des3_alg = {
.cra_name = "ecb(des3_ede)",
.cra_driver_name = "ecb-des3_ede-s390",
.cra_priority = 400, /* combo: des3 + ecb */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.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,
.setkey = des3_setkey,
.encrypt = ecb_des3_encrypt,
.decrypt = ecb_des3_decrypt,
}
}
};
static int cbc_des3_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, CPACF_KMC_TDEA_192, &walk);
}
static int cbc_des3_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_desall_crypt(desc, CPACF_KMC_TDEA_192 | CPACF_DECRYPT,
&walk);
}
static struct crypto_alg cbc_des3_alg = {
.cra_name = "cbc(des3_ede)",
.cra_driver_name = "cbc-des3_ede-s390",
.cra_priority = 400, /* combo: des3 + cbc */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = DES_BLOCK_SIZE,
.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 = cbc_des3_encrypt,
.decrypt = cbc_des3_decrypt,
}
}
};
static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
{
unsigned int i, n;
/* align to block size, max. PAGE_SIZE */
n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(DES_BLOCK_SIZE - 1);
memcpy(ctrptr, iv, DES_BLOCK_SIZE);
for (i = (n / DES_BLOCK_SIZE) - 1; i > 0; i--) {
memcpy(ctrptr + DES_BLOCK_SIZE, ctrptr, DES_BLOCK_SIZE);
crypto_inc(ctrptr + DES_BLOCK_SIZE, DES_BLOCK_SIZE);
ctrptr += DES_BLOCK_SIZE;
}
return n;
}
static int ctr_desall_crypt(struct blkcipher_desc *desc, unsigned long fc,
struct blkcipher_walk *walk)
{
struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
u8 buf[DES_BLOCK_SIZE], *ctrptr;
unsigned int n, nbytes;
int ret, locked;
locked = spin_trylock(&ctrblk_lock);
ret = blkcipher_walk_virt_block(desc, walk, DES_BLOCK_SIZE);
while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
n = DES_BLOCK_SIZE;
if (nbytes >= 2*DES_BLOCK_SIZE && locked)
n = __ctrblk_init(ctrblk, walk->iv, nbytes);
ctrptr = (n > DES_BLOCK_SIZE) ? ctrblk : walk->iv;
cpacf_kmctr(fc, ctx->key, walk->dst.virt.addr,
walk->src.virt.addr, n, ctrptr);
if (ctrptr == ctrblk)
memcpy(walk->iv, ctrptr + n - DES_BLOCK_SIZE,
DES_BLOCK_SIZE);
crypto_inc(walk->iv, DES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, nbytes - n);
}
if (locked)
spin_unlock(&ctrblk_lock);
/* final block may be < DES_BLOCK_SIZE, copy only nbytes */
if (nbytes) {
cpacf_kmctr(fc, ctx->key, buf, walk->src.virt.addr,
DES_BLOCK_SIZE, walk->iv);
memcpy(walk->dst.virt.addr, buf, nbytes);
crypto_inc(walk->iv, DES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, 0);
}
return ret;
}
static int ctr_des_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_desall_crypt(desc, CPACF_KMCTR_DEA, &walk);
}
static int ctr_des_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_desall_crypt(desc, CPACF_KMCTR_DEA | CPACF_DECRYPT, &walk);
}
static struct crypto_alg ctr_des_alg = {
.cra_name = "ctr(des)",
.cra_driver_name = "ctr-des-s390",
.cra_priority = 400, /* combo: des + ctr */
.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 = DES_KEY_SIZE,
.max_keysize = DES_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = des_setkey,
.encrypt = ctr_des_encrypt,
.decrypt = ctr_des_decrypt,
}
}
};
static int ctr_des3_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_desall_crypt(desc, CPACF_KMCTR_TDEA_192, &walk);
}
static int ctr_des3_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_desall_crypt(desc, CPACF_KMCTR_TDEA_192 | CPACF_DECRYPT,
&walk);
}
static struct crypto_alg ctr_des3_alg = {
.cra_name = "ctr(des3_ede)",
.cra_driver_name = "ctr-des3_ede-s390",
.cra_priority = 400, /* combo: des3 + ede */
.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 struct crypto_alg *des_s390_algs_ptr[8];
static int des_s390_algs_num;
static int des_s390_register_alg(struct crypto_alg *alg)
{
int ret;
ret = crypto_register_alg(alg);
if (!ret)
des_s390_algs_ptr[des_s390_algs_num++] = alg;
return ret;
}
static void des_s390_exit(void)
{
while (des_s390_algs_num--)
crypto_unregister_alg(des_s390_algs_ptr[des_s390_algs_num]);
if (ctrblk)
free_page((unsigned long) ctrblk);
}
static int __init des_s390_init(void)
{
int ret;
/* Query available functions for KM, KMC and KMCTR */
cpacf_query(CPACF_KM, &km_functions);
cpacf_query(CPACF_KMC, &kmc_functions);
cpacf_query(CPACF_KMCTR, &kmctr_functions);
if (cpacf_test_func(&km_functions, CPACF_KM_DEA)) {
ret = des_s390_register_alg(&des_alg);
if (ret)
goto out_err;
ret = des_s390_register_alg(&ecb_des_alg);
if (ret)
goto out_err;
}
if (cpacf_test_func(&kmc_functions, CPACF_KMC_DEA)) {
ret = des_s390_register_alg(&cbc_des_alg);
if (ret)
goto out_err;
}
if (cpacf_test_func(&km_functions, CPACF_KM_TDEA_192)) {
ret = des_s390_register_alg(&des3_alg);
if (ret)
goto out_err;
ret = des_s390_register_alg(&ecb_des3_alg);
if (ret)
goto out_err;
}
if (cpacf_test_func(&kmc_functions, CPACF_KMC_TDEA_192)) {
ret = des_s390_register_alg(&cbc_des3_alg);
if (ret)
goto out_err;
}
if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA) ||
cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
if (!ctrblk) {
ret = -ENOMEM;
goto out_err;
}
}
if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA)) {
ret = des_s390_register_alg(&ctr_des_alg);
if (ret)
goto out_err;
}
if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
ret = des_s390_register_alg(&ctr_des3_alg);
if (ret)
goto out_err;
}
return 0;
out_err:
des_s390_exit();
return ret;
}
module_cpu_feature_match(MSA, des_s390_init);
module_exit(des_s390_exit);
MODULE_ALIAS_CRYPTO("des");
MODULE_ALIAS_CRYPTO("des3_ede");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
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