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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/s390/crypto/aes_s390.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/crypto/aes_s390.c')
-rw-r--r--arch/s390/crypto/aes_s390.c1061
1 files changed, 1061 insertions, 0 deletions
diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c
new file mode 100644
index 000000000..7b66e81e5
--- /dev/null
+++ b/arch/s390/crypto/aes_s390.c
@@ -0,0 +1,1061 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Cryptographic API.
+ *
+ * s390 implementation of the AES Cipher Algorithm.
+ *
+ * s390 Version:
+ * Copyright IBM Corp. 2005, 2017
+ * Author(s): Jan Glauber (jang@de.ibm.com)
+ * Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
+ * Patrick Steuer <patrick.steuer@de.ibm.com>
+ * Harald Freudenberger <freude@de.ibm.com>
+ *
+ * Derived from "crypto/aes_generic.c"
+ */
+
+#define KMSG_COMPONENT "aes_s390"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <crypto/aes.h>
+#include <crypto/algapi.h>
+#include <crypto/ghash.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/cipher.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/cpufeature.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/fips.h>
+#include <linux/string.h>
+#include <crypto/xts.h>
+#include <asm/cpacf.h>
+
+static u8 *ctrblk;
+static DEFINE_MUTEX(ctrblk_lock);
+
+static cpacf_mask_t km_functions, kmc_functions, kmctr_functions,
+ kma_functions;
+
+struct s390_aes_ctx {
+ u8 key[AES_MAX_KEY_SIZE];
+ int key_len;
+ unsigned long fc;
+ union {
+ struct crypto_skcipher *skcipher;
+ struct crypto_cipher *cip;
+ } fallback;
+};
+
+struct s390_xts_ctx {
+ u8 key[32];
+ u8 pcc_key[32];
+ int key_len;
+ unsigned long fc;
+ struct crypto_skcipher *fallback;
+};
+
+struct gcm_sg_walk {
+ struct scatter_walk walk;
+ unsigned int walk_bytes;
+ u8 *walk_ptr;
+ unsigned int walk_bytes_remain;
+ u8 buf[AES_BLOCK_SIZE];
+ unsigned int buf_bytes;
+ u8 *ptr;
+ unsigned int nbytes;
+};
+
+static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
+ unsigned int key_len)
+{
+ struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
+ sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
+ CRYPTO_TFM_REQ_MASK);
+
+ return crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
+}
+
+static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
+ unsigned int key_len)
+{
+ struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+ unsigned long fc;
+
+ /* Pick the correct function code based on the key length */
+ fc = (key_len == 16) ? CPACF_KM_AES_128 :
+ (key_len == 24) ? CPACF_KM_AES_192 :
+ (key_len == 32) ? CPACF_KM_AES_256 : 0;
+
+ /* Check if the function code is available */
+ sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
+ if (!sctx->fc)
+ return setkey_fallback_cip(tfm, in_key, key_len);
+
+ sctx->key_len = key_len;
+ memcpy(sctx->key, in_key, key_len);
+ return 0;
+}
+
+static void crypto_aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+{
+ struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ if (unlikely(!sctx->fc)) {
+ crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
+ return;
+ }
+ cpacf_km(sctx->fc, &sctx->key, out, in, AES_BLOCK_SIZE);
+}
+
+static void crypto_aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+{
+ struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ if (unlikely(!sctx->fc)) {
+ crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
+ return;
+ }
+ cpacf_km(sctx->fc | CPACF_DECRYPT,
+ &sctx->key, out, in, AES_BLOCK_SIZE);
+}
+
+static int fallback_init_cip(struct crypto_tfm *tfm)
+{
+ const char *name = tfm->__crt_alg->cra_name;
+ struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ sctx->fallback.cip = crypto_alloc_cipher(name, 0,
+ CRYPTO_ALG_NEED_FALLBACK);
+
+ if (IS_ERR(sctx->fallback.cip)) {
+ pr_err("Allocating AES fallback algorithm %s failed\n",
+ name);
+ return PTR_ERR(sctx->fallback.cip);
+ }
+
+ return 0;
+}
+
+static void fallback_exit_cip(struct crypto_tfm *tfm)
+{
+ struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
+
+ crypto_free_cipher(sctx->fallback.cip);
+ sctx->fallback.cip = NULL;
+}
+
+static struct crypto_alg aes_alg = {
+ .cra_name = "aes",
+ .cra_driver_name = "aes-s390",
+ .cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct s390_aes_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = fallback_init_cip,
+ .cra_exit = fallback_exit_cip,
+ .cra_u = {
+ .cipher = {
+ .cia_min_keysize = AES_MIN_KEY_SIZE,
+ .cia_max_keysize = AES_MAX_KEY_SIZE,
+ .cia_setkey = aes_set_key,
+ .cia_encrypt = crypto_aes_encrypt,
+ .cia_decrypt = crypto_aes_decrypt,
+ }
+ }
+};
+
+static int setkey_fallback_skcipher(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int len)
+{
+ struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
+
+ crypto_skcipher_clear_flags(sctx->fallback.skcipher,
+ CRYPTO_TFM_REQ_MASK);
+ crypto_skcipher_set_flags(sctx->fallback.skcipher,
+ crypto_skcipher_get_flags(tfm) &
+ CRYPTO_TFM_REQ_MASK);
+ return crypto_skcipher_setkey(sctx->fallback.skcipher, key, len);
+}
+
+static int fallback_skcipher_crypt(struct s390_aes_ctx *sctx,
+ struct skcipher_request *req,
+ unsigned long modifier)
+{
+ struct skcipher_request *subreq = skcipher_request_ctx(req);
+
+ *subreq = *req;
+ skcipher_request_set_tfm(subreq, sctx->fallback.skcipher);
+ return (modifier & CPACF_DECRYPT) ?
+ crypto_skcipher_decrypt(subreq) :
+ crypto_skcipher_encrypt(subreq);
+}
+
+static int ecb_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
+ unsigned int key_len)
+{
+ struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
+ unsigned long fc;
+
+ /* Pick the correct function code based on the key length */
+ fc = (key_len == 16) ? CPACF_KM_AES_128 :
+ (key_len == 24) ? CPACF_KM_AES_192 :
+ (key_len == 32) ? CPACF_KM_AES_256 : 0;
+
+ /* Check if the function code is available */
+ sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
+ if (!sctx->fc)
+ return setkey_fallback_skcipher(tfm, in_key, key_len);
+
+ sctx->key_len = key_len;
+ memcpy(sctx->key, in_key, key_len);
+ return 0;
+}
+
+static int ecb_aes_crypt(struct skcipher_request *req, unsigned long modifier)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_walk walk;
+ unsigned int nbytes, n;
+ int ret;
+
+ if (unlikely(!sctx->fc))
+ return fallback_skcipher_crypt(sctx, req, modifier);
+
+ ret = skcipher_walk_virt(&walk, req, false);
+ while ((nbytes = walk.nbytes) != 0) {
+ /* only use complete blocks */
+ n = nbytes & ~(AES_BLOCK_SIZE - 1);
+ cpacf_km(sctx->fc | modifier, sctx->key,
+ walk.dst.virt.addr, walk.src.virt.addr, n);
+ ret = skcipher_walk_done(&walk, nbytes - n);
+ }
+ return ret;
+}
+
+static int ecb_aes_encrypt(struct skcipher_request *req)
+{
+ return ecb_aes_crypt(req, 0);
+}
+
+static int ecb_aes_decrypt(struct skcipher_request *req)
+{
+ return ecb_aes_crypt(req, CPACF_DECRYPT);
+}
+
+static int fallback_init_skcipher(struct crypto_skcipher *tfm)
+{
+ const char *name = crypto_tfm_alg_name(&tfm->base);
+ struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
+
+ sctx->fallback.skcipher = crypto_alloc_skcipher(name, 0,
+ CRYPTO_ALG_NEED_FALLBACK | CRYPTO_ALG_ASYNC);
+
+ if (IS_ERR(sctx->fallback.skcipher)) {
+ pr_err("Allocating AES fallback algorithm %s failed\n",
+ name);
+ return PTR_ERR(sctx->fallback.skcipher);
+ }
+
+ crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
+ crypto_skcipher_reqsize(sctx->fallback.skcipher));
+ return 0;
+}
+
+static void fallback_exit_skcipher(struct crypto_skcipher *tfm)
+{
+ struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
+
+ crypto_free_skcipher(sctx->fallback.skcipher);
+}
+
+static struct skcipher_alg ecb_aes_alg = {
+ .base.cra_name = "ecb(aes)",
+ .base.cra_driver_name = "ecb-aes-s390",
+ .base.cra_priority = 401, /* combo: aes + ecb + 1 */
+ .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
+ .base.cra_blocksize = AES_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct s390_aes_ctx),
+ .base.cra_module = THIS_MODULE,
+ .init = fallback_init_skcipher,
+ .exit = fallback_exit_skcipher,
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .setkey = ecb_aes_set_key,
+ .encrypt = ecb_aes_encrypt,
+ .decrypt = ecb_aes_decrypt,
+};
+
+static int cbc_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
+ unsigned int key_len)
+{
+ struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
+ unsigned long fc;
+
+ /* Pick the correct function code based on the key length */
+ fc = (key_len == 16) ? CPACF_KMC_AES_128 :
+ (key_len == 24) ? CPACF_KMC_AES_192 :
+ (key_len == 32) ? CPACF_KMC_AES_256 : 0;
+
+ /* Check if the function code is available */
+ sctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
+ if (!sctx->fc)
+ return setkey_fallback_skcipher(tfm, in_key, key_len);
+
+ sctx->key_len = key_len;
+ memcpy(sctx->key, in_key, key_len);
+ return 0;
+}
+
+static int cbc_aes_crypt(struct skcipher_request *req, unsigned long modifier)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_walk walk;
+ unsigned int nbytes, n;
+ int ret;
+ struct {
+ u8 iv[AES_BLOCK_SIZE];
+ u8 key[AES_MAX_KEY_SIZE];
+ } param;
+
+ if (unlikely(!sctx->fc))
+ return fallback_skcipher_crypt(sctx, req, modifier);
+
+ ret = skcipher_walk_virt(&walk, req, false);
+ if (ret)
+ return ret;
+ memcpy(param.iv, walk.iv, AES_BLOCK_SIZE);
+ memcpy(param.key, sctx->key, sctx->key_len);
+ while ((nbytes = walk.nbytes) != 0) {
+ /* only use complete blocks */
+ n = nbytes & ~(AES_BLOCK_SIZE - 1);
+ cpacf_kmc(sctx->fc | modifier, &param,
+ walk.dst.virt.addr, walk.src.virt.addr, n);
+ memcpy(walk.iv, param.iv, AES_BLOCK_SIZE);
+ ret = skcipher_walk_done(&walk, nbytes - n);
+ }
+ memzero_explicit(&param, sizeof(param));
+ return ret;
+}
+
+static int cbc_aes_encrypt(struct skcipher_request *req)
+{
+ return cbc_aes_crypt(req, 0);
+}
+
+static int cbc_aes_decrypt(struct skcipher_request *req)
+{
+ return cbc_aes_crypt(req, CPACF_DECRYPT);
+}
+
+static struct skcipher_alg cbc_aes_alg = {
+ .base.cra_name = "cbc(aes)",
+ .base.cra_driver_name = "cbc-aes-s390",
+ .base.cra_priority = 402, /* ecb-aes-s390 + 1 */
+ .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
+ .base.cra_blocksize = AES_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct s390_aes_ctx),
+ .base.cra_module = THIS_MODULE,
+ .init = fallback_init_skcipher,
+ .exit = fallback_exit_skcipher,
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = cbc_aes_set_key,
+ .encrypt = cbc_aes_encrypt,
+ .decrypt = cbc_aes_decrypt,
+};
+
+static int xts_fallback_setkey(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int len)
+{
+ struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
+
+ crypto_skcipher_clear_flags(xts_ctx->fallback, CRYPTO_TFM_REQ_MASK);
+ crypto_skcipher_set_flags(xts_ctx->fallback,
+ crypto_skcipher_get_flags(tfm) &
+ CRYPTO_TFM_REQ_MASK);
+ return crypto_skcipher_setkey(xts_ctx->fallback, key, len);
+}
+
+static int xts_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
+ unsigned int key_len)
+{
+ struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
+ unsigned long fc;
+ int err;
+
+ err = xts_fallback_setkey(tfm, in_key, key_len);
+ if (err)
+ return err;
+
+ /* In fips mode only 128 bit or 256 bit keys are valid */
+ if (fips_enabled && key_len != 32 && key_len != 64)
+ return -EINVAL;
+
+ /* Pick the correct function code based on the key length */
+ fc = (key_len == 32) ? CPACF_KM_XTS_128 :
+ (key_len == 64) ? CPACF_KM_XTS_256 : 0;
+
+ /* Check if the function code is available */
+ xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
+ if (!xts_ctx->fc)
+ return 0;
+
+ /* Split the XTS key into the two subkeys */
+ key_len = key_len / 2;
+ xts_ctx->key_len = key_len;
+ memcpy(xts_ctx->key, in_key, key_len);
+ memcpy(xts_ctx->pcc_key, in_key + key_len, key_len);
+ return 0;
+}
+
+static int xts_aes_crypt(struct skcipher_request *req, unsigned long modifier)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
+ struct skcipher_walk walk;
+ unsigned int offset, nbytes, n;
+ int ret;
+ struct {
+ u8 key[32];
+ u8 tweak[16];
+ u8 block[16];
+ u8 bit[16];
+ u8 xts[16];
+ } pcc_param;
+ struct {
+ u8 key[32];
+ u8 init[16];
+ } xts_param;
+
+ if (req->cryptlen < AES_BLOCK_SIZE)
+ return -EINVAL;
+
+ if (unlikely(!xts_ctx->fc || (req->cryptlen % AES_BLOCK_SIZE) != 0)) {
+ struct skcipher_request *subreq = skcipher_request_ctx(req);
+
+ *subreq = *req;
+ skcipher_request_set_tfm(subreq, xts_ctx->fallback);
+ return (modifier & CPACF_DECRYPT) ?
+ crypto_skcipher_decrypt(subreq) :
+ crypto_skcipher_encrypt(subreq);
+ }
+
+ ret = skcipher_walk_virt(&walk, req, false);
+ if (ret)
+ return ret;
+ offset = xts_ctx->key_len & 0x10;
+ memset(pcc_param.block, 0, sizeof(pcc_param.block));
+ memset(pcc_param.bit, 0, sizeof(pcc_param.bit));
+ memset(pcc_param.xts, 0, sizeof(pcc_param.xts));
+ memcpy(pcc_param.tweak, walk.iv, sizeof(pcc_param.tweak));
+ memcpy(pcc_param.key + offset, xts_ctx->pcc_key, xts_ctx->key_len);
+ cpacf_pcc(xts_ctx->fc, pcc_param.key + offset);
+
+ memcpy(xts_param.key + offset, xts_ctx->key, xts_ctx->key_len);
+ memcpy(xts_param.init, pcc_param.xts, 16);
+
+ while ((nbytes = walk.nbytes) != 0) {
+ /* only use complete blocks */
+ n = nbytes & ~(AES_BLOCK_SIZE - 1);
+ cpacf_km(xts_ctx->fc | modifier, xts_param.key + offset,
+ walk.dst.virt.addr, walk.src.virt.addr, n);
+ ret = skcipher_walk_done(&walk, nbytes - n);
+ }
+ memzero_explicit(&pcc_param, sizeof(pcc_param));
+ memzero_explicit(&xts_param, sizeof(xts_param));
+ return ret;
+}
+
+static int xts_aes_encrypt(struct skcipher_request *req)
+{
+ return xts_aes_crypt(req, 0);
+}
+
+static int xts_aes_decrypt(struct skcipher_request *req)
+{
+ return xts_aes_crypt(req, CPACF_DECRYPT);
+}
+
+static int xts_fallback_init(struct crypto_skcipher *tfm)
+{
+ const char *name = crypto_tfm_alg_name(&tfm->base);
+ struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
+
+ xts_ctx->fallback = crypto_alloc_skcipher(name, 0,
+ CRYPTO_ALG_NEED_FALLBACK | CRYPTO_ALG_ASYNC);
+
+ if (IS_ERR(xts_ctx->fallback)) {
+ pr_err("Allocating XTS fallback algorithm %s failed\n",
+ name);
+ return PTR_ERR(xts_ctx->fallback);
+ }
+ crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
+ crypto_skcipher_reqsize(xts_ctx->fallback));
+ return 0;
+}
+
+static void xts_fallback_exit(struct crypto_skcipher *tfm)
+{
+ struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
+
+ crypto_free_skcipher(xts_ctx->fallback);
+}
+
+static struct skcipher_alg xts_aes_alg = {
+ .base.cra_name = "xts(aes)",
+ .base.cra_driver_name = "xts-aes-s390",
+ .base.cra_priority = 402, /* ecb-aes-s390 + 1 */
+ .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
+ .base.cra_blocksize = AES_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct s390_xts_ctx),
+ .base.cra_module = THIS_MODULE,
+ .init = xts_fallback_init,
+ .exit = xts_fallback_exit,
+ .min_keysize = 2 * AES_MIN_KEY_SIZE,
+ .max_keysize = 2 * AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = xts_aes_set_key,
+ .encrypt = xts_aes_encrypt,
+ .decrypt = xts_aes_decrypt,
+};
+
+static int ctr_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
+ unsigned int key_len)
+{
+ struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
+ unsigned long fc;
+
+ /* Pick the correct function code based on the key length */
+ fc = (key_len == 16) ? CPACF_KMCTR_AES_128 :
+ (key_len == 24) ? CPACF_KMCTR_AES_192 :
+ (key_len == 32) ? CPACF_KMCTR_AES_256 : 0;
+
+ /* Check if the function code is available */
+ sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
+ if (!sctx->fc)
+ return setkey_fallback_skcipher(tfm, in_key, key_len);
+
+ sctx->key_len = key_len;
+ memcpy(sctx->key, in_key, key_len);
+ return 0;
+}
+
+static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
+{
+ unsigned int i, n;
+
+ /* only use complete blocks, max. PAGE_SIZE */
+ memcpy(ctrptr, iv, AES_BLOCK_SIZE);
+ n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
+ for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
+ memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
+ crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
+ ctrptr += AES_BLOCK_SIZE;
+ }
+ return n;
+}
+
+static int ctr_aes_crypt(struct skcipher_request *req)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
+ u8 buf[AES_BLOCK_SIZE], *ctrptr;
+ struct skcipher_walk walk;
+ unsigned int n, nbytes;
+ int ret, locked;
+
+ if (unlikely(!sctx->fc))
+ return fallback_skcipher_crypt(sctx, req, 0);
+
+ locked = mutex_trylock(&ctrblk_lock);
+
+ ret = skcipher_walk_virt(&walk, req, false);
+ while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
+ n = AES_BLOCK_SIZE;
+
+ if (nbytes >= 2*AES_BLOCK_SIZE && locked)
+ n = __ctrblk_init(ctrblk, walk.iv, nbytes);
+ ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk.iv;
+ cpacf_kmctr(sctx->fc, sctx->key, walk.dst.virt.addr,
+ walk.src.virt.addr, n, ctrptr);
+ if (ctrptr == ctrblk)
+ memcpy(walk.iv, ctrptr + n - AES_BLOCK_SIZE,
+ AES_BLOCK_SIZE);
+ crypto_inc(walk.iv, AES_BLOCK_SIZE);
+ ret = skcipher_walk_done(&walk, nbytes - n);
+ }
+ if (locked)
+ mutex_unlock(&ctrblk_lock);
+ /*
+ * final block may be < AES_BLOCK_SIZE, copy only nbytes
+ */
+ if (nbytes) {
+ memset(buf, 0, AES_BLOCK_SIZE);
+ memcpy(buf, walk.src.virt.addr, nbytes);
+ cpacf_kmctr(sctx->fc, sctx->key, buf, buf,
+ AES_BLOCK_SIZE, walk.iv);
+ memcpy(walk.dst.virt.addr, buf, nbytes);
+ crypto_inc(walk.iv, AES_BLOCK_SIZE);
+ ret = skcipher_walk_done(&walk, 0);
+ }
+
+ return ret;
+}
+
+static struct skcipher_alg ctr_aes_alg = {
+ .base.cra_name = "ctr(aes)",
+ .base.cra_driver_name = "ctr-aes-s390",
+ .base.cra_priority = 402, /* ecb-aes-s390 + 1 */
+ .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
+ .base.cra_blocksize = 1,
+ .base.cra_ctxsize = sizeof(struct s390_aes_ctx),
+ .base.cra_module = THIS_MODULE,
+ .init = fallback_init_skcipher,
+ .exit = fallback_exit_skcipher,
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = ctr_aes_set_key,
+ .encrypt = ctr_aes_crypt,
+ .decrypt = ctr_aes_crypt,
+ .chunksize = AES_BLOCK_SIZE,
+};
+
+static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
+
+ switch (keylen) {
+ case AES_KEYSIZE_128:
+ ctx->fc = CPACF_KMA_GCM_AES_128;
+ break;
+ case AES_KEYSIZE_192:
+ ctx->fc = CPACF_KMA_GCM_AES_192;
+ break;
+ case AES_KEYSIZE_256:
+ ctx->fc = CPACF_KMA_GCM_AES_256;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ memcpy(ctx->key, key, keylen);
+ ctx->key_len = keylen;
+ return 0;
+}
+
+static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
+{
+ switch (authsize) {
+ case 4:
+ case 8:
+ case 12:
+ case 13:
+ case 14:
+ case 15:
+ case 16:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void gcm_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
+ unsigned int len)
+{
+ memset(gw, 0, sizeof(*gw));
+ gw->walk_bytes_remain = len;
+ scatterwalk_start(&gw->walk, sg);
+}
+
+static inline unsigned int _gcm_sg_clamp_and_map(struct gcm_sg_walk *gw)
+{
+ struct scatterlist *nextsg;
+
+ gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
+ while (!gw->walk_bytes) {
+ nextsg = sg_next(gw->walk.sg);
+ if (!nextsg)
+ return 0;
+ scatterwalk_start(&gw->walk, nextsg);
+ gw->walk_bytes = scatterwalk_clamp(&gw->walk,
+ gw->walk_bytes_remain);
+ }
+ gw->walk_ptr = scatterwalk_map(&gw->walk);
+ return gw->walk_bytes;
+}
+
+static inline void _gcm_sg_unmap_and_advance(struct gcm_sg_walk *gw,
+ unsigned int nbytes)
+{
+ gw->walk_bytes_remain -= nbytes;
+ scatterwalk_unmap(gw->walk_ptr);
+ scatterwalk_advance(&gw->walk, nbytes);
+ scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
+ gw->walk_ptr = NULL;
+}
+
+static int gcm_in_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
+{
+ int n;
+
+ if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
+ gw->ptr = gw->buf;
+ gw->nbytes = gw->buf_bytes;
+ goto out;
+ }
+
+ if (gw->walk_bytes_remain == 0) {
+ gw->ptr = NULL;
+ gw->nbytes = 0;
+ goto out;
+ }
+
+ if (!_gcm_sg_clamp_and_map(gw)) {
+ gw->ptr = NULL;
+ gw->nbytes = 0;
+ goto out;
+ }
+
+ if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
+ gw->ptr = gw->walk_ptr;
+ gw->nbytes = gw->walk_bytes;
+ goto out;
+ }
+
+ while (1) {
+ n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
+ memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
+ gw->buf_bytes += n;
+ _gcm_sg_unmap_and_advance(gw, n);
+ if (gw->buf_bytes >= minbytesneeded) {
+ gw->ptr = gw->buf;
+ gw->nbytes = gw->buf_bytes;
+ goto out;
+ }
+ if (!_gcm_sg_clamp_and_map(gw)) {
+ gw->ptr = NULL;
+ gw->nbytes = 0;
+ goto out;
+ }
+ }
+
+out:
+ return gw->nbytes;
+}
+
+static int gcm_out_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
+{
+ if (gw->walk_bytes_remain == 0) {
+ gw->ptr = NULL;
+ gw->nbytes = 0;
+ goto out;
+ }
+
+ if (!_gcm_sg_clamp_and_map(gw)) {
+ gw->ptr = NULL;
+ gw->nbytes = 0;
+ goto out;
+ }
+
+ if (gw->walk_bytes >= minbytesneeded) {
+ gw->ptr = gw->walk_ptr;
+ gw->nbytes = gw->walk_bytes;
+ goto out;
+ }
+
+ scatterwalk_unmap(gw->walk_ptr);
+ gw->walk_ptr = NULL;
+
+ gw->ptr = gw->buf;
+ gw->nbytes = sizeof(gw->buf);
+
+out:
+ return gw->nbytes;
+}
+
+static int gcm_in_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
+{
+ if (gw->ptr == NULL)
+ return 0;
+
+ if (gw->ptr == gw->buf) {
+ int n = gw->buf_bytes - bytesdone;
+ if (n > 0) {
+ memmove(gw->buf, gw->buf + bytesdone, n);
+ gw->buf_bytes = n;
+ } else
+ gw->buf_bytes = 0;
+ } else
+ _gcm_sg_unmap_and_advance(gw, bytesdone);
+
+ return bytesdone;
+}
+
+static int gcm_out_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
+{
+ int i, n;
+
+ if (gw->ptr == NULL)
+ return 0;
+
+ if (gw->ptr == gw->buf) {
+ for (i = 0; i < bytesdone; i += n) {
+ if (!_gcm_sg_clamp_and_map(gw))
+ return i;
+ n = min(gw->walk_bytes, bytesdone - i);
+ memcpy(gw->walk_ptr, gw->buf + i, n);
+ _gcm_sg_unmap_and_advance(gw, n);
+ }
+ } else
+ _gcm_sg_unmap_and_advance(gw, bytesdone);
+
+ return bytesdone;
+}
+
+static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
+{
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
+ unsigned int ivsize = crypto_aead_ivsize(tfm);
+ unsigned int taglen = crypto_aead_authsize(tfm);
+ unsigned int aadlen = req->assoclen;
+ unsigned int pclen = req->cryptlen;
+ int ret = 0;
+
+ unsigned int n, len, in_bytes, out_bytes,
+ min_bytes, bytes, aad_bytes, pc_bytes;
+ struct gcm_sg_walk gw_in, gw_out;
+ u8 tag[GHASH_DIGEST_SIZE];
+
+ struct {
+ u32 _[3]; /* reserved */
+ u32 cv; /* Counter Value */
+ u8 t[GHASH_DIGEST_SIZE];/* Tag */
+ u8 h[AES_BLOCK_SIZE]; /* Hash-subkey */
+ u64 taadl; /* Total AAD Length */
+ u64 tpcl; /* Total Plain-/Cipher-text Length */
+ u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
+ u8 k[AES_MAX_KEY_SIZE]; /* Key */
+ } param;
+
+ /*
+ * encrypt
+ * req->src: aad||plaintext
+ * req->dst: aad||ciphertext||tag
+ * decrypt
+ * req->src: aad||ciphertext||tag
+ * req->dst: aad||plaintext, return 0 or -EBADMSG
+ * aad, plaintext and ciphertext may be empty.
+ */
+ if (flags & CPACF_DECRYPT)
+ pclen -= taglen;
+ len = aadlen + pclen;
+
+ memset(&param, 0, sizeof(param));
+ param.cv = 1;
+ param.taadl = aadlen * 8;
+ param.tpcl = pclen * 8;
+ memcpy(param.j0, req->iv, ivsize);
+ *(u32 *)(param.j0 + ivsize) = 1;
+ memcpy(param.k, ctx->key, ctx->key_len);
+
+ gcm_walk_start(&gw_in, req->src, len);
+ gcm_walk_start(&gw_out, req->dst, len);
+
+ do {
+ min_bytes = min_t(unsigned int,
+ aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
+ in_bytes = gcm_in_walk_go(&gw_in, min_bytes);
+ out_bytes = gcm_out_walk_go(&gw_out, min_bytes);
+ bytes = min(in_bytes, out_bytes);
+
+ if (aadlen + pclen <= bytes) {
+ aad_bytes = aadlen;
+ pc_bytes = pclen;
+ flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
+ } else {
+ if (aadlen <= bytes) {
+ aad_bytes = aadlen;
+ pc_bytes = (bytes - aadlen) &
+ ~(AES_BLOCK_SIZE - 1);
+ flags |= CPACF_KMA_LAAD;
+ } else {
+ aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
+ pc_bytes = 0;
+ }
+ }
+
+ if (aad_bytes > 0)
+ memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
+
+ cpacf_kma(ctx->fc | flags, &param,
+ gw_out.ptr + aad_bytes,
+ gw_in.ptr + aad_bytes, pc_bytes,
+ gw_in.ptr, aad_bytes);
+
+ n = aad_bytes + pc_bytes;
+ if (gcm_in_walk_done(&gw_in, n) != n)
+ return -ENOMEM;
+ if (gcm_out_walk_done(&gw_out, n) != n)
+ return -ENOMEM;
+ aadlen -= aad_bytes;
+ pclen -= pc_bytes;
+ } while (aadlen + pclen > 0);
+
+ if (flags & CPACF_DECRYPT) {
+ scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
+ if (crypto_memneq(tag, param.t, taglen))
+ ret = -EBADMSG;
+ } else
+ scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
+
+ memzero_explicit(&param, sizeof(param));
+ return ret;
+}
+
+static int gcm_aes_encrypt(struct aead_request *req)
+{
+ return gcm_aes_crypt(req, CPACF_ENCRYPT);
+}
+
+static int gcm_aes_decrypt(struct aead_request *req)
+{
+ return gcm_aes_crypt(req, CPACF_DECRYPT);
+}
+
+static struct aead_alg gcm_aes_aead = {
+ .setkey = gcm_aes_setkey,
+ .setauthsize = gcm_aes_setauthsize,
+ .encrypt = gcm_aes_encrypt,
+ .decrypt = gcm_aes_decrypt,
+
+ .ivsize = GHASH_BLOCK_SIZE - sizeof(u32),
+ .maxauthsize = GHASH_DIGEST_SIZE,
+ .chunksize = AES_BLOCK_SIZE,
+
+ .base = {
+ .cra_blocksize = 1,
+ .cra_ctxsize = sizeof(struct s390_aes_ctx),
+ .cra_priority = 900,
+ .cra_name = "gcm(aes)",
+ .cra_driver_name = "gcm-aes-s390",
+ .cra_module = THIS_MODULE,
+ },
+};
+
+static struct crypto_alg *aes_s390_alg;
+static struct skcipher_alg *aes_s390_skcipher_algs[4];
+static int aes_s390_skciphers_num;
+static struct aead_alg *aes_s390_aead_alg;
+
+static int aes_s390_register_skcipher(struct skcipher_alg *alg)
+{
+ int ret;
+
+ ret = crypto_register_skcipher(alg);
+ if (!ret)
+ aes_s390_skcipher_algs[aes_s390_skciphers_num++] = alg;
+ return ret;
+}
+
+static void aes_s390_fini(void)
+{
+ if (aes_s390_alg)
+ crypto_unregister_alg(aes_s390_alg);
+ while (aes_s390_skciphers_num--)
+ crypto_unregister_skcipher(aes_s390_skcipher_algs[aes_s390_skciphers_num]);
+ if (ctrblk)
+ free_page((unsigned long) ctrblk);
+
+ if (aes_s390_aead_alg)
+ crypto_unregister_aead(aes_s390_aead_alg);
+}
+
+static int __init aes_s390_init(void)
+{
+ int ret;
+
+ /* Query available functions for KM, KMC, KMCTR and KMA */
+ cpacf_query(CPACF_KM, &km_functions);
+ cpacf_query(CPACF_KMC, &kmc_functions);
+ cpacf_query(CPACF_KMCTR, &kmctr_functions);
+ cpacf_query(CPACF_KMA, &kma_functions);
+
+ if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
+ cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
+ cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
+ ret = crypto_register_alg(&aes_alg);
+ if (ret)
+ goto out_err;
+ aes_s390_alg = &aes_alg;
+ ret = aes_s390_register_skcipher(&ecb_aes_alg);
+ if (ret)
+ goto out_err;
+ }
+
+ if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
+ cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
+ cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
+ ret = aes_s390_register_skcipher(&cbc_aes_alg);
+ if (ret)
+ goto out_err;
+ }
+
+ if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
+ cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
+ ret = aes_s390_register_skcipher(&xts_aes_alg);
+ if (ret)
+ goto out_err;
+ }
+
+ if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
+ cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
+ cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
+ ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
+ if (!ctrblk) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
+ ret = aes_s390_register_skcipher(&ctr_aes_alg);
+ if (ret)
+ goto out_err;
+ }
+
+ if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
+ cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
+ cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
+ ret = crypto_register_aead(&gcm_aes_aead);
+ if (ret)
+ goto out_err;
+ aes_s390_aead_alg = &gcm_aes_aead;
+ }
+
+ return 0;
+out_err:
+ aes_s390_fini();
+ return ret;
+}
+
+module_cpu_feature_match(S390_CPU_FEATURE_MSA, aes_s390_init);
+module_exit(aes_s390_fini);
+
+MODULE_ALIAS_CRYPTO("aes-all");
+
+MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);