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Commit 7988fb2c authored by Eric Biggers's avatar Eric Biggers Committed by Herbert Xu
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crypto: s390/aes - convert to skcipher API 

Convert the glue code for the S390 CPACF implementations of AES-ECB,
AES-CBC, AES-XTS, and AES-CTR from the deprecated "blkcipher" API to the
"skcipher" API.  This is needed in order for the blkcipher API to be
removed.

Note: I made CTR use the same function for encryption and decryption,
since CTR encryption and decryption are identical.
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Reviewed-by: default avatarHarald Freudenberger <freude@linux.ibm.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent cd5d2f84
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Showing with 234 additions and 375 deletions
arch/s390/crypto/aes_s390.c
View file @ 7988fb2c
......@@ -44,7 +44,7 @@ struct s390_aes_ctx {
int key_len;
unsigned long fc;
union {
struct crypto_sync_skcipher *blk;
struct crypto_skcipher *skcipher;
struct crypto_cipher *cip;
} fallback;
};
......@@ -54,7 +54,7 @@ struct s390_xts_ctx {
u8 pcc_key[32];
int key_len;
unsigned long fc;
struct crypto_sync_skcipher *fallback;
struct crypto_skcipher *fallback;
};
struct gcm_sg_walk {
......@@ -178,66 +178,41 @@ static struct crypto_alg aes_alg = {
}
};
static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
static int setkey_fallback_skcipher(struct crypto_skcipher *tfm, const u8 *key,
unsigned int len)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
unsigned int ret;
struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
int ret;
crypto_sync_skcipher_clear_flags(sctx->fallback.blk,
crypto_skcipher_clear_flags(sctx->fallback.skcipher,
CRYPTO_TFM_REQ_MASK);
crypto_sync_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags &
crypto_skcipher_set_flags(sctx->fallback.skcipher,
crypto_skcipher_get_flags(tfm) &
CRYPTO_TFM_REQ_MASK);
ret = crypto_sync_skcipher_setkey(sctx->fallback.blk, key, len);
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
tfm->crt_flags |= crypto_sync_skcipher_get_flags(sctx->fallback.blk) &
CRYPTO_TFM_RES_MASK;
return ret;
}
static int fallback_blk_dec(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
unsigned int ret;
struct crypto_blkcipher *tfm = desc->tfm;
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
skcipher_request_set_sync_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_skcipher_decrypt(req);
skcipher_request_zero(req);
ret = crypto_skcipher_setkey(sctx->fallback.skcipher, key, len);
crypto_skcipher_set_flags(tfm,
crypto_skcipher_get_flags(sctx->fallback.skcipher) &
CRYPTO_TFM_RES_MASK);
return ret;
}
static int fallback_blk_enc(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
static int fallback_skcipher_crypt(struct s390_aes_ctx *sctx,
struct skcipher_request *req,
unsigned long modifier)
{
unsigned int ret;
struct crypto_blkcipher *tfm = desc->tfm;
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
skcipher_request_set_sync_tfm(req, sctx->fallback.blk);
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
struct skcipher_request *subreq = skcipher_request_ctx(req);
ret = crypto_skcipher_encrypt(req);
return ret;
*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_tfm *tfm, const u8 *in_key,
static int ecb_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
unsigned int key_len)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
unsigned long fc;
/* Pick the correct function code based on the key length */
......@@ -248,111 +223,92 @@ static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
/* Check if the function code is available */
sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
if (!sctx->fc)
return setkey_fallback_blk(tfm, in_key, key_len);
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 blkcipher_desc *desc, unsigned long modifier,
struct blkcipher_walk *walk)
static int ecb_aes_crypt(struct skcipher_request *req, unsigned long modifier)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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;
ret = blkcipher_walk_virt(desc, walk);
while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
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 = blkcipher_walk_done(desc, walk, nbytes - n);
walk.dst.virt.addr, walk.src.virt.addr, n);
ret = skcipher_walk_done(&walk, nbytes - n);
}
return ret;
}
static int ecb_aes_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
static int ecb_aes_encrypt(struct skcipher_request *req)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
if (unlikely(!sctx->fc))
return fallback_blk_enc(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_aes_crypt(desc, 0, &walk);
return ecb_aes_crypt(req, 0);
}
static int ecb_aes_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
static int ecb_aes_decrypt(struct skcipher_request *req)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
if (unlikely(!sctx->fc))
return fallback_blk_dec(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_aes_crypt(desc, CPACF_DECRYPT, &walk);
return ecb_aes_crypt(req, CPACF_DECRYPT);
}
static int fallback_init_blk(struct crypto_tfm *tfm)
static int fallback_init_skcipher(struct crypto_skcipher *tfm)
{
const char *name = tfm->__crt_alg->cra_name;
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
const char *name = crypto_tfm_alg_name(&tfm->base);
struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
sctx->fallback.blk = crypto_alloc_sync_skcipher(name, 0,
CRYPTO_ALG_NEED_FALLBACK);
sctx->fallback.skcipher = crypto_alloc_skcipher(name, 0,
CRYPTO_ALG_NEED_FALLBACK | CRYPTO_ALG_ASYNC);
if (IS_ERR(sctx->fallback.blk)) {
if (IS_ERR(sctx->fallback.skcipher)) {
pr_err("Allocating AES fallback algorithm %s failed\n",
name);
return PTR_ERR(sctx->fallback.blk);
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_blk(struct crypto_tfm *tfm)
static void fallback_exit_skcipher(struct crypto_skcipher *tfm)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
crypto_free_sync_skcipher(sctx->fallback.blk);
crypto_free_skcipher(sctx->fallback.skcipher);
}
static struct crypto_alg ecb_aes_alg = {
.cra_name = "ecb(aes)",
.cra_driver_name = "ecb-aes-s390",
.cra_priority = 401, /* combo: aes + ecb + 1 */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_aes_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = fallback_init_blk,
.cra_exit = fallback_exit_blk,
.cra_u = {
.blkcipher = {
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_tfm *tfm, const u8 *in_key,
static int cbc_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
unsigned int key_len)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
unsigned long fc;
/* Pick the correct function code based on the key length */
......@@ -363,17 +319,18 @@ static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
/* Check if the function code is available */
sctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
if (!sctx->fc)
return setkey_fallback_blk(tfm, in_key, key_len);
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 blkcipher_desc *desc, unsigned long modifier,
struct blkcipher_walk *walk)
static int cbc_aes_crypt(struct skcipher_request *req, unsigned long modifier)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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 {
......@@ -381,134 +338,74 @@ static int cbc_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
u8 key[AES_MAX_KEY_SIZE];
} param;
ret = blkcipher_walk_virt(desc, walk);
memcpy(param.iv, walk->iv, AES_BLOCK_SIZE);
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) >= AES_BLOCK_SIZE) {
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);
ret = blkcipher_walk_done(desc, walk, nbytes - n);
walk.dst.virt.addr, walk.src.virt.addr, n);
memcpy(walk.iv, param.iv, AES_BLOCK_SIZE);
ret = skcipher_walk_done(&walk, nbytes - n);
}
memcpy(walk->iv, param.iv, AES_BLOCK_SIZE);
return ret;
}
static int cbc_aes_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
static int cbc_aes_encrypt(struct skcipher_request *req)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
if (unlikely(!sctx->fc))
return fallback_blk_enc(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_aes_crypt(desc, 0, &walk);
return cbc_aes_crypt(req, 0);
}
static int cbc_aes_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
static int cbc_aes_decrypt(struct skcipher_request *req)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
if (unlikely(!sctx->fc))
return fallback_blk_dec(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
return cbc_aes_crypt(desc, CPACF_DECRYPT, &walk);
return cbc_aes_crypt(req, CPACF_DECRYPT);
}
static struct crypto_alg cbc_aes_alg = {
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-s390",
.cra_priority = 402, /* ecb-aes-s390 + 1 */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_aes_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = fallback_init_blk,
.cra_exit = fallback_exit_blk,
.cra_u = {
.blkcipher = {
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_tfm *tfm, const u8 *key,
static int xts_fallback_setkey(struct crypto_skcipher *tfm, const u8 *key,
unsigned int len)
{
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
unsigned int ret;
struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
int ret;
crypto_sync_skcipher_clear_flags(xts_ctx->fallback,
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);
crypto_sync_skcipher_set_flags(xts_ctx->fallback, tfm->crt_flags &
CRYPTO_TFM_REQ_MASK);
ret = crypto_sync_skcipher_setkey(xts_ctx->fallback, key, len);
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
tfm->crt_flags |= crypto_sync_skcipher_get_flags(xts_ctx->fallback) &
CRYPTO_TFM_RES_MASK;
return ret;
}
static int xts_fallback_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct crypto_blkcipher *tfm = desc->tfm;
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
unsigned int ret;
skcipher_request_set_sync_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_skcipher_decrypt(req);
skcipher_request_zero(req);
return ret;
}
static int xts_fallback_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct crypto_blkcipher *tfm = desc->tfm;
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
unsigned int ret;
skcipher_request_set_sync_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_skcipher_encrypt(req);
skcipher_request_zero(req);
ret = crypto_skcipher_setkey(xts_ctx->fallback, key, len);
crypto_skcipher_set_flags(tfm,
crypto_skcipher_get_flags(xts_ctx->fallback) &
CRYPTO_TFM_RES_MASK);
return ret;
}
static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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_tfm_ctx(tfm);
struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
unsigned long fc;
int err;
......@@ -518,7 +415,7 @@ static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
/* In fips mode only 128 bit or 256 bit keys are valid */
if (fips_enabled && key_len != 32 && key_len != 64) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
......@@ -539,10 +436,11 @@ static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
return 0;
}
static int xts_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
struct blkcipher_walk *walk)
static int xts_aes_crypt(struct skcipher_request *req, unsigned long modifier)
{
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
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 {
......@@ -557,113 +455,100 @@ static int xts_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
u8 init[16];
} xts_param;
ret = blkcipher_walk_virt(desc, walk);
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.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) >= AES_BLOCK_SIZE) {
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 = blkcipher_walk_done(desc, walk, nbytes - n);
walk.dst.virt.addr, walk.src.virt.addr, n);
ret = skcipher_walk_done(&walk, nbytes - n);
}
return ret;
}
static int xts_aes_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
static int xts_aes_encrypt(struct skcipher_request *req)
{
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
if (!nbytes)
return -EINVAL;
if (unlikely(!xts_ctx->fc || (nbytes % XTS_BLOCK_SIZE) != 0))
return xts_fallback_encrypt(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
return xts_aes_crypt(desc, 0, &walk);
return xts_aes_crypt(req, 0);
}
static int xts_aes_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
static int xts_aes_decrypt(struct skcipher_request *req)
{
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
if (!nbytes)
return -EINVAL;
if (unlikely(!xts_ctx->fc || (nbytes % XTS_BLOCK_SIZE) != 0))
return xts_fallback_decrypt(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
return xts_aes_crypt(desc, CPACF_DECRYPT, &walk);
return xts_aes_crypt(req, CPACF_DECRYPT);
}
static int xts_fallback_init(struct crypto_tfm *tfm)
static int xts_fallback_init(struct crypto_skcipher *tfm)
{
const char *name = tfm->__crt_alg->cra_name;
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(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_sync_skcipher(name, 0,
CRYPTO_ALG_NEED_FALLBACK);
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_tfm *tfm)
static void xts_fallback_exit(struct crypto_skcipher *tfm)
{
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
crypto_free_sync_skcipher(xts_ctx->fallback);
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 = 402, /* ecb-aes-s390 + 1 */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s390_xts_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = xts_fallback_init,
.cra_exit = xts_fallback_exit,
.cra_u = {
.blkcipher = {
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_tfm *tfm, const u8 *in_key,
static int ctr_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
unsigned int key_len)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
unsigned long fc;
/* Pick the correct function code based on the key length */
......@@ -674,7 +559,7 @@ static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
/* Check if the function code is available */
sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
if (!sctx->fc)
return setkey_fallback_blk(tfm, in_key, key_len);
return setkey_fallback_skcipher(tfm, in_key, key_len);
sctx->key_len = key_len;
memcpy(sctx->key, in_key, key_len);
......@@ -696,30 +581,34 @@ static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
return n;
}
static int ctr_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
struct blkcipher_walk *walk)
static int ctr_aes_crypt(struct skcipher_request *req)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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 = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
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 | modifier, sctx->key,
walk->dst.virt.addr, walk->src.virt.addr,
n, ctrptr);
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,
memcpy(walk.iv, ctrptr + n - AES_BLOCK_SIZE,
AES_BLOCK_SIZE);
crypto_inc(walk->iv, AES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, nbytes - n);
crypto_inc(walk.iv, AES_BLOCK_SIZE);
ret = skcipher_walk_done(&walk, nbytes - n);
}
if (locked)
mutex_unlock(&ctrblk_lock);
......@@ -727,67 +616,33 @@ static int ctr_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
* final block may be < AES_BLOCK_SIZE, copy only nbytes
*/
if (nbytes) {
cpacf_kmctr(sctx->fc | modifier, sctx->key,
buf, walk->src.virt.addr,
AES_BLOCK_SIZE, walk->iv);
memcpy(walk->dst.virt.addr, buf, nbytes);
crypto_inc(walk->iv, AES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, 0);
cpacf_kmctr(sctx->fc, sctx->key, buf, walk.src.virt.addr,
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 int ctr_aes_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
if (unlikely(!sctx->fc))
return fallback_blk_enc(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_aes_crypt(desc, 0, &walk);
}
static int ctr_aes_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
if (unlikely(!sctx->fc))
return fallback_blk_dec(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_aes_crypt(desc, CPACF_DECRYPT, &walk);
}
static struct crypto_alg ctr_aes_alg = {
.cra_name = "ctr(aes)",
.cra_driver_name = "ctr-aes-s390",
.cra_priority = 402, /* ecb-aes-s390 + 1 */
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
CRYPTO_ALG_NEED_FALLBACK,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct s390_aes_ctx),
.cra_type = &crypto_blkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = fallback_init_blk,
.cra_exit = fallback_exit_blk,
.cra_u = {
.blkcipher = {
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_encrypt,
.decrypt = ctr_aes_decrypt,
}
}
.encrypt = ctr_aes_crypt,
.decrypt = ctr_aes_crypt,
.chunksize = AES_BLOCK_SIZE,
};
static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
......@@ -1116,24 +971,27 @@ static struct aead_alg gcm_aes_aead = {
},
};
static struct crypto_alg *aes_s390_algs_ptr[5];
static int aes_s390_algs_num;
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_alg(struct crypto_alg *alg)
static int aes_s390_register_skcipher(struct skcipher_alg *alg)
{
int ret;
ret = crypto_register_alg(alg);
ret = crypto_register_skcipher(alg);
if (!ret)
aes_s390_algs_ptr[aes_s390_algs_num++] = alg;
aes_s390_skcipher_algs[aes_s390_skciphers_num++] = alg;
return ret;
}
static void aes_s390_fini(void)
{
while (aes_s390_algs_num--)
crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
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);
......@@ -1154,10 +1012,11 @@ static int __init aes_s390_init(void)
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 = aes_s390_register_alg(&aes_alg);
ret = crypto_register_alg(&aes_alg);
if (ret)
goto out_err;
ret = aes_s390_register_alg(&ecb_aes_alg);
aes_s390_alg = &aes_alg;
ret = aes_s390_register_skcipher(&ecb_aes_alg);
if (ret)
goto out_err;
}
......@@ -1165,14 +1024,14 @@ static int __init aes_s390_init(void)
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_alg(&cbc_aes_alg);
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_alg(&xts_aes_alg);
ret = aes_s390_register_skcipher(&xts_aes_alg);
if (ret)
goto out_err;
}
......@@ -1185,7 +1044,7 @@ static int __init aes_s390_init(void)
ret = -ENOMEM;
goto out_err;
}
ret = aes_s390_register_alg(&ctr_aes_alg);
ret = aes_s390_register_skcipher(&ctr_aes_alg);
if (ret)
goto out_err;
}
......
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