des_s390 implements support for 3DES with a 128 bit key. This mode is probably
not used anywhere, less secure than 3DES with a 192 bit key and not
implemented in the generic des version. Removing this mode seems to be low risk
and will ease maintenance of the code.
Signed-off-by: Jan Glauber <[email protected]>
---
arch/s390/crypto/des_s390.c | 191 --------------------------------------------
1 file changed, 1 insertion(+), 190 deletions(-)
--- a/arch/s390/crypto/des_s390.c
+++ b/arch/s390/crypto/des_s390.c
@@ -24,9 +24,6 @@
#define DES_BLOCK_SIZE 8
#define DES_KEY_SIZE 8
-#define DES3_128_KEY_SIZE (2 * DES_KEY_SIZE)
-#define DES3_128_BLOCK_SIZE DES_BLOCK_SIZE
-
#define DES3_192_KEY_SIZE (3 * DES_KEY_SIZE)
#define DES3_192_BLOCK_SIZE DES_BLOCK_SIZE
@@ -35,11 +32,6 @@ struct crypt_s390_des_ctx {
u8 key[DES_KEY_SIZE];
};
-struct crypt_s390_des3_128_ctx {
- u8 iv[DES_BLOCK_SIZE];
- u8 key[DES3_128_KEY_SIZE];
-};
-
struct crypt_s390_des3_192_ctx {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_192_KEY_SIZE];
@@ -237,165 +229,6 @@ static struct crypto_alg cbc_des_alg = {
* complementation keys. Any weakness is obviated by the use of
* multiple keys.
*
- * However, if the two independent 64-bit keys are equal,
- * then the DES3 operation is simply the same as DES.
- * Implementers MUST reject keys that exhibit this property.
- *
- */
-static int des3_128_setkey(struct crypto_tfm *tfm, const u8 *key,
- unsigned int keylen)
-{
- int i, ret;
- struct crypt_s390_des3_128_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)) &&
- (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
- *flags |= CRYPTO_TFM_RES_WEAK_KEY;
- return -EINVAL;
- }
- for (i = 0; i < 2; 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_128_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
-{
- struct crypt_s390_des3_128_ctx *dctx = crypto_tfm_ctx(tfm);
-
- crypt_s390_km(KM_TDEA_128_ENCRYPT, dctx->key, dst, (void*)src,
- DES3_128_BLOCK_SIZE);
-}
-
-static void des3_128_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
-{
- struct crypt_s390_des3_128_ctx *dctx = crypto_tfm_ctx(tfm);
-
- crypt_s390_km(KM_TDEA_128_DECRYPT, dctx->key, dst, (void*)src,
- DES3_128_BLOCK_SIZE);
-}
-
-static struct crypto_alg des3_128_alg = {
- .cra_name = "des3_ede128",
- .cra_driver_name = "des3_ede128-s390",
- .cra_priority = CRYPT_S390_PRIORITY,
- .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
- .cra_blocksize = DES3_128_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct crypt_s390_des3_128_ctx),
- .cra_module = THIS_MODULE,
- .cra_list = LIST_HEAD_INIT(des3_128_alg.cra_list),
- .cra_u = {
- .cipher = {
- .cia_min_keysize = DES3_128_KEY_SIZE,
- .cia_max_keysize = DES3_128_KEY_SIZE,
- .cia_setkey = des3_128_setkey,
- .cia_encrypt = des3_128_encrypt,
- .cia_decrypt = des3_128_decrypt,
- }
- }
-};
-
-static int ecb_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 ecb_desall_crypt(desc, KM_TDEA_128_ENCRYPT, sctx->key, &walk);
-}
-
-static int ecb_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 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
@@ -553,10 +386,9 @@ static struct crypto_alg cbc_des3_192_al
static int des_s390_init(void)
{
- int ret = 0;
+ int ret;
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;
@@ -569,17 +401,6 @@ static int des_s390_init(void)
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;
@@ -589,7 +410,6 @@ static int des_s390_init(void)
ret = crypto_register_alg(&cbc_des3_192_alg);
if (ret)
goto cbc_des3_192_err;
-
out:
return ret;
@@ -598,12 +418,6 @@ cbc_des3_192_err:
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);
@@ -618,9 +432,6 @@ static void __exit des_s390_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);
On Thu, May 20, 2010 at 01:19:11PM +0200, Jan Glauber wrote:
> des_s390 implements support for 3DES with a 128 bit key. This mode is probably
> not used anywhere, less secure than 3DES with a 192 bit key and not
> implemented in the generic des version. Removing this mode seems to be low risk
> and will ease maintenance of the code.
>
> Signed-off-by: Jan Glauber <[email protected]>
Both patches applied. Thanks Jan!
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