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Diffstat (limited to 'arch/s390/crypto/aes_s390.c')
-rw-r--r--arch/s390/crypto/aes_s390.c230
1 files changed, 116 insertions, 114 deletions
diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c
index 48e1a2d3e318..2ea18b050309 100644
--- a/arch/s390/crypto/aes_s390.c
+++ b/arch/s390/crypto/aes_s390.c
@@ -22,13 +22,14 @@
#include <crypto/aes.h>
#include <crypto/algapi.h>
+#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/cpufeature.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <crypto/xts.h>
-#include "crypt_s390.h"
+#include <asm/cpacf.h>
#define AES_KEYLEN_128 1
#define AES_KEYLEN_192 2
@@ -44,7 +45,7 @@ struct s390_aes_ctx {
long dec;
int key_len;
union {
- struct crypto_blkcipher *blk;
+ struct crypto_skcipher *blk;
struct crypto_cipher *cip;
} fallback;
};
@@ -63,7 +64,7 @@ struct s390_xts_ctx {
long enc;
long dec;
int key_len;
- struct crypto_blkcipher *fallback;
+ struct crypto_skcipher *fallback;
};
/*
@@ -145,16 +146,16 @@ static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
switch (sctx->key_len) {
case 16:
- crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in,
- AES_BLOCK_SIZE);
+ cpacf_km(CPACF_KM_AES_128_ENC, &sctx->key, out, in,
+ AES_BLOCK_SIZE);
break;
case 24:
- crypt_s390_km(KM_AES_192_ENCRYPT, &sctx->key, out, in,
- AES_BLOCK_SIZE);
+ cpacf_km(CPACF_KM_AES_192_ENC, &sctx->key, out, in,
+ AES_BLOCK_SIZE);
break;
case 32:
- crypt_s390_km(KM_AES_256_ENCRYPT, &sctx->key, out, in,
- AES_BLOCK_SIZE);
+ cpacf_km(CPACF_KM_AES_256_ENC, &sctx->key, out, in,
+ AES_BLOCK_SIZE);
break;
}
}
@@ -170,16 +171,16 @@ static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
switch (sctx->key_len) {
case 16:
- crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in,
- AES_BLOCK_SIZE);
+ cpacf_km(CPACF_KM_AES_128_DEC, &sctx->key, out, in,
+ AES_BLOCK_SIZE);
break;
case 24:
- crypt_s390_km(KM_AES_192_DECRYPT, &sctx->key, out, in,
- AES_BLOCK_SIZE);
+ cpacf_km(CPACF_KM_AES_192_DEC, &sctx->key, out, in,
+ AES_BLOCK_SIZE);
break;
case 32:
- crypt_s390_km(KM_AES_256_DECRYPT, &sctx->key, out, in,
- AES_BLOCK_SIZE);
+ cpacf_km(CPACF_KM_AES_256_DEC, &sctx->key, out, in,
+ AES_BLOCK_SIZE);
break;
}
}
@@ -212,7 +213,7 @@ static void fallback_exit_cip(struct crypto_tfm *tfm)
static struct crypto_alg aes_alg = {
.cra_name = "aes",
.cra_driver_name = "aes-s390",
- .cra_priority = CRYPT_S390_PRIORITY,
+ .cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
@@ -237,16 +238,16 @@ static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
unsigned int ret;
- sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
- sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags &
- CRYPTO_TFM_REQ_MASK);
+ crypto_skcipher_clear_flags(sctx->fallback.blk, CRYPTO_TFM_REQ_MASK);
+ crypto_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags &
+ CRYPTO_TFM_REQ_MASK);
+
+ ret = crypto_skcipher_setkey(sctx->fallback.blk, key, len);
+
+ tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
+ tfm->crt_flags |= crypto_skcipher_get_flags(sctx->fallback.blk) &
+ CRYPTO_TFM_RES_MASK;
- ret = crypto_blkcipher_setkey(sctx->fallback.blk, key, len);
- if (ret) {
- tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
- tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags &
- CRYPTO_TFM_RES_MASK);
- }
return ret;
}
@@ -255,15 +256,17 @@ static int fallback_blk_dec(struct blkcipher_desc *desc,
unsigned int nbytes)
{
unsigned int ret;
- struct crypto_blkcipher *tfm;
- struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
+ struct crypto_blkcipher *tfm = desc->tfm;
+ struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
+ SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
- tfm = desc->tfm;
- desc->tfm = sctx->fallback.blk;
+ skcipher_request_set_tfm(req, sctx->fallback.blk);
+ skcipher_request_set_callback(req, desc->flags, NULL, NULL);
+ skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
- ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
+ ret = crypto_skcipher_decrypt(req);
- desc->tfm = tfm;
+ skcipher_request_zero(req);
return ret;
}
@@ -272,15 +275,15 @@ static int fallback_blk_enc(struct blkcipher_desc *desc,
unsigned int nbytes)
{
unsigned int ret;
- struct crypto_blkcipher *tfm;
- struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
+ struct crypto_blkcipher *tfm = desc->tfm;
+ struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
+ SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
- tfm = desc->tfm;
- desc->tfm = sctx->fallback.blk;
+ skcipher_request_set_tfm(req, sctx->fallback.blk);
+ skcipher_request_set_callback(req, desc->flags, NULL, NULL);
+ skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
- ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
-
- desc->tfm = tfm;
+ ret = crypto_skcipher_encrypt(req);
return ret;
}
@@ -298,16 +301,16 @@ static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
switch (key_len) {
case 16:
- sctx->enc = KM_AES_128_ENCRYPT;
- sctx->dec = KM_AES_128_DECRYPT;
+ sctx->enc = CPACF_KM_AES_128_ENC;
+ sctx->dec = CPACF_KM_AES_128_DEC;
break;
case 24:
- sctx->enc = KM_AES_192_ENCRYPT;
- sctx->dec = KM_AES_192_DECRYPT;
+ sctx->enc = CPACF_KM_AES_192_ENC;
+ sctx->dec = CPACF_KM_AES_192_DEC;
break;
case 32:
- sctx->enc = KM_AES_256_ENCRYPT;
- sctx->dec = KM_AES_256_DECRYPT;
+ sctx->enc = CPACF_KM_AES_256_ENC;
+ sctx->dec = CPACF_KM_AES_256_DEC;
break;
}
@@ -326,7 +329,7 @@ static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
u8 *out = walk->dst.virt.addr;
u8 *in = walk->src.virt.addr;
- ret = crypt_s390_km(func, param, out, in, n);
+ ret = cpacf_km(func, param, out, in, n);
if (ret < 0 || ret != n)
return -EIO;
@@ -370,8 +373,9 @@ static int fallback_init_blk(struct crypto_tfm *tfm)
const char *name = tfm->__crt_alg->cra_name;
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
- sctx->fallback.blk = crypto_alloc_blkcipher(name, 0,
- CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
+ sctx->fallback.blk = crypto_alloc_skcipher(name, 0,
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(sctx->fallback.blk)) {
pr_err("Allocating AES fallback algorithm %s failed\n",
@@ -386,14 +390,13 @@ static void fallback_exit_blk(struct crypto_tfm *tfm)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
- crypto_free_blkcipher(sctx->fallback.blk);
- sctx->fallback.blk = NULL;
+ crypto_free_skcipher(sctx->fallback.blk);
}
static struct crypto_alg ecb_aes_alg = {
.cra_name = "ecb(aes)",
.cra_driver_name = "ecb-aes-s390",
- .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
+ .cra_priority = 400, /* combo: aes + ecb */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
@@ -427,16 +430,16 @@ static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
switch (key_len) {
case 16:
- sctx->enc = KMC_AES_128_ENCRYPT;
- sctx->dec = KMC_AES_128_DECRYPT;
+ sctx->enc = CPACF_KMC_AES_128_ENC;
+ sctx->dec = CPACF_KMC_AES_128_DEC;
break;
case 24:
- sctx->enc = KMC_AES_192_ENCRYPT;
- sctx->dec = KMC_AES_192_DECRYPT;
+ sctx->enc = CPACF_KMC_AES_192_ENC;
+ sctx->dec = CPACF_KMC_AES_192_DEC;
break;
case 32:
- sctx->enc = KMC_AES_256_ENCRYPT;
- sctx->dec = KMC_AES_256_DECRYPT;
+ sctx->enc = CPACF_KMC_AES_256_ENC;
+ sctx->dec = CPACF_KMC_AES_256_DEC;
break;
}
@@ -465,7 +468,7 @@ static int cbc_aes_crypt(struct blkcipher_desc *desc, long func,
u8 *out = walk->dst.virt.addr;
u8 *in = walk->src.virt.addr;
- ret = crypt_s390_kmc(func, &param, out, in, n);
+ ret = cpacf_kmc(func, &param, out, in, n);
if (ret < 0 || ret != n)
return -EIO;
@@ -509,7 +512,7 @@ static int cbc_aes_decrypt(struct blkcipher_desc *desc,
static struct crypto_alg cbc_aes_alg = {
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-s390",
- .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
+ .cra_priority = 400, /* combo: aes + cbc */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
@@ -536,16 +539,16 @@ static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
unsigned int ret;
- xts_ctx->fallback->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
- xts_ctx->fallback->base.crt_flags |= (tfm->crt_flags &
- CRYPTO_TFM_REQ_MASK);
+ crypto_skcipher_clear_flags(xts_ctx->fallback, CRYPTO_TFM_REQ_MASK);
+ crypto_skcipher_set_flags(xts_ctx->fallback, tfm->crt_flags &
+ CRYPTO_TFM_REQ_MASK);
+
+ ret = crypto_skcipher_setkey(xts_ctx->fallback, key, len);
+
+ tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
+ tfm->crt_flags |= crypto_skcipher_get_flags(xts_ctx->fallback) &
+ CRYPTO_TFM_RES_MASK;
- ret = crypto_blkcipher_setkey(xts_ctx->fallback, key, len);
- if (ret) {
- tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
- tfm->crt_flags |= (xts_ctx->fallback->base.crt_flags &
- CRYPTO_TFM_RES_MASK);
- }
return ret;
}
@@ -553,16 +556,18 @@ static int xts_fallback_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
- struct crypto_blkcipher *tfm;
+ struct crypto_blkcipher *tfm = desc->tfm;
+ struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
+ SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
unsigned int ret;
- tfm = desc->tfm;
- desc->tfm = xts_ctx->fallback;
+ skcipher_request_set_tfm(req, xts_ctx->fallback);
+ skcipher_request_set_callback(req, desc->flags, NULL, NULL);
+ skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
- ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
+ ret = crypto_skcipher_decrypt(req);
- desc->tfm = tfm;
+ skcipher_request_zero(req);
return ret;
}
@@ -570,16 +575,18 @@ static int xts_fallback_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
- struct crypto_blkcipher *tfm;
+ struct crypto_blkcipher *tfm = desc->tfm;
+ struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
+ SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
unsigned int ret;
- tfm = desc->tfm;
- desc->tfm = xts_ctx->fallback;
+ skcipher_request_set_tfm(req, xts_ctx->fallback);
+ skcipher_request_set_callback(req, desc->flags, NULL, NULL);
+ skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
- ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
+ ret = crypto_skcipher_encrypt(req);
- desc->tfm = tfm;
+ skcipher_request_zero(req);
return ret;
}
@@ -596,8 +603,8 @@ static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
switch (key_len) {
case 32:
- xts_ctx->enc = KM_XTS_128_ENCRYPT;
- xts_ctx->dec = KM_XTS_128_DECRYPT;
+ xts_ctx->enc = CPACF_KM_XTS_128_ENC;
+ xts_ctx->dec = CPACF_KM_XTS_128_DEC;
memcpy(xts_ctx->key + 16, in_key, 16);
memcpy(xts_ctx->pcc_key + 16, in_key + 16, 16);
break;
@@ -607,8 +614,8 @@ static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
xts_fallback_setkey(tfm, in_key, key_len);
break;
case 64:
- xts_ctx->enc = KM_XTS_256_ENCRYPT;
- xts_ctx->dec = KM_XTS_256_DECRYPT;
+ xts_ctx->enc = CPACF_KM_XTS_256_ENC;
+ xts_ctx->dec = CPACF_KM_XTS_256_DEC;
memcpy(xts_ctx->key, in_key, 32);
memcpy(xts_ctx->pcc_key, in_key + 32, 32);
break;
@@ -643,7 +650,8 @@ static int xts_aes_crypt(struct blkcipher_desc *desc, long func,
memset(pcc_param.xts, 0, sizeof(pcc_param.xts));
memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak));
memcpy(pcc_param.key, xts_ctx->pcc_key, 32);
- ret = crypt_s390_pcc(func, &pcc_param.key[offset]);
+ /* remove decipher modifier bit from 'func' and call PCC */
+ ret = cpacf_pcc(func & 0x7f, &pcc_param.key[offset]);
if (ret < 0)
return -EIO;
@@ -655,7 +663,7 @@ static int xts_aes_crypt(struct blkcipher_desc *desc, long func,
out = walk->dst.virt.addr;
in = walk->src.virt.addr;
- ret = crypt_s390_km(func, &xts_param.key[offset], out, in, n);
+ ret = cpacf_km(func, &xts_param.key[offset], out, in, n);
if (ret < 0 || ret != n)
return -EIO;
@@ -699,8 +707,9 @@ static int xts_fallback_init(struct crypto_tfm *tfm)
const char *name = tfm->__crt_alg->cra_name;
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
- xts_ctx->fallback = crypto_alloc_blkcipher(name, 0,
- CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
+ xts_ctx->fallback = crypto_alloc_skcipher(name, 0,
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(xts_ctx->fallback)) {
pr_err("Allocating XTS fallback algorithm %s failed\n",
@@ -714,14 +723,13 @@ static void xts_fallback_exit(struct crypto_tfm *tfm)
{
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
- crypto_free_blkcipher(xts_ctx->fallback);
- xts_ctx->fallback = NULL;
+ crypto_free_skcipher(xts_ctx->fallback);
}
static struct crypto_alg xts_aes_alg = {
.cra_name = "xts(aes)",
.cra_driver_name = "xts-aes-s390",
- .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
+ .cra_priority = 400, /* combo: aes + xts */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
@@ -751,16 +759,16 @@ static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
switch (key_len) {
case 16:
- sctx->enc = KMCTR_AES_128_ENCRYPT;
- sctx->dec = KMCTR_AES_128_DECRYPT;
+ sctx->enc = CPACF_KMCTR_AES_128_ENC;
+ sctx->dec = CPACF_KMCTR_AES_128_DEC;
break;
case 24:
- sctx->enc = KMCTR_AES_192_ENCRYPT;
- sctx->dec = KMCTR_AES_192_DECRYPT;
+ sctx->enc = CPACF_KMCTR_AES_192_ENC;
+ sctx->dec = CPACF_KMCTR_AES_192_DEC;
break;
case 32:
- sctx->enc = KMCTR_AES_256_ENCRYPT;
- sctx->dec = KMCTR_AES_256_DECRYPT;
+ sctx->enc = CPACF_KMCTR_AES_256_ENC;
+ sctx->dec = CPACF_KMCTR_AES_256_DEC;
break;
}
@@ -804,8 +812,7 @@ static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
n = __ctrblk_init(ctrptr, nbytes);
else
n = AES_BLOCK_SIZE;
- ret = crypt_s390_kmctr(func, sctx->key, out, in,
- n, ctrptr);
+ ret = cpacf_kmctr(func, sctx->key, out, in, n, ctrptr);
if (ret < 0 || ret != n) {
if (ctrptr == ctrblk)
spin_unlock(&ctrblk_lock);
@@ -837,8 +844,8 @@ static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
if (nbytes) {
out = walk->dst.virt.addr;
in = walk->src.virt.addr;
- ret = crypt_s390_kmctr(func, sctx->key, buf, in,
- AES_BLOCK_SIZE, ctrbuf);
+ ret = cpacf_kmctr(func, sctx->key, buf, in,
+ AES_BLOCK_SIZE, ctrbuf);
if (ret < 0 || ret != AES_BLOCK_SIZE)
return -EIO;
memcpy(out, buf, nbytes);
@@ -875,7 +882,7 @@ static int ctr_aes_decrypt(struct blkcipher_desc *desc,
static struct crypto_alg ctr_aes_alg = {
.cra_name = "ctr(aes)",
.cra_driver_name = "ctr-aes-s390",
- .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
+ .cra_priority = 400, /* combo: aes + ctr */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct s390_aes_ctx),
@@ -899,11 +906,11 @@ static int __init aes_s390_init(void)
{
int ret;
- if (crypt_s390_func_available(KM_AES_128_ENCRYPT, CRYPT_S390_MSA))
+ if (cpacf_query(CPACF_KM, CPACF_KM_AES_128_ENC))
keylen_flag |= AES_KEYLEN_128;
- if (crypt_s390_func_available(KM_AES_192_ENCRYPT, CRYPT_S390_MSA))
+ if (cpacf_query(CPACF_KM, CPACF_KM_AES_192_ENC))
keylen_flag |= AES_KEYLEN_192;
- if (crypt_s390_func_available(KM_AES_256_ENCRYPT, CRYPT_S390_MSA))
+ if (cpacf_query(CPACF_KM, CPACF_KM_AES_256_ENC))
keylen_flag |= AES_KEYLEN_256;
if (!keylen_flag)
@@ -926,22 +933,17 @@ static int __init aes_s390_init(void)
if (ret)
goto cbc_aes_err;
- if (crypt_s390_func_available(KM_XTS_128_ENCRYPT,
- CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
- crypt_s390_func_available(KM_XTS_256_ENCRYPT,
- CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
+ if (cpacf_query(CPACF_KM, CPACF_KM_XTS_128_ENC) &&
+ cpacf_query(CPACF_KM, CPACF_KM_XTS_256_ENC)) {
ret = crypto_register_alg(&xts_aes_alg);
if (ret)
goto xts_aes_err;
xts_aes_alg_reg = 1;
}
- if (crypt_s390_func_available(KMCTR_AES_128_ENCRYPT,
- CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
- crypt_s390_func_available(KMCTR_AES_192_ENCRYPT,
- CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
- crypt_s390_func_available(KMCTR_AES_256_ENCRYPT,
- CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
+ if (cpacf_query(CPACF_KMCTR, CPACF_KMCTR_AES_128_ENC) &&
+ cpacf_query(CPACF_KMCTR, CPACF_KMCTR_AES_192_ENC) &&
+ cpacf_query(CPACF_KMCTR, CPACF_KMCTR_AES_256_ENC)) {
ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
if (!ctrblk) {
ret = -ENOMEM;