static int ctr_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
struct blkcipher_walk *walk)
{
struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
u8 buf[AES_BLOCK_SIZE], *ctrptr;
unsigned int nbytes, n, k;
int ret, locked;
locked = spin_trylock(&ctrblk_lock);
ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
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;
k = cpacf_kmctr(ctx->fc | modifier, ctx->pk.protkey,
walk->dst.virt.addr, walk->src.virt.addr,
n, ctrptr);
if (k) {
if (ctrptr == ctrblk)
memcpy(walk->iv, ctrptr + k - AES_BLOCK_SIZE,
AES_BLOCK_SIZE);
crypto_inc(walk->iv, AES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, nbytes - n);
}
if (k < n) {
if (__ctr_paes_set_key(ctx) != 0) {
if (locked)
spin_unlock(&ctrblk_lock);
return blkcipher_walk_done(desc, walk, -EIO);
}
}
}
if (locked)
spin_unlock(&ctrblk_lock);
/*
* final block may be < AES_BLOCK_SIZE, copy only nbytes
*/
if (nbytes) {
while (1) {
if (cpacf_kmctr(ctx->fc | modifier,
ctx->pk.protkey, buf,
walk->src.virt.addr, AES_BLOCK_SIZE,
walk->iv) == AES_BLOCK_SIZE)
break;
if (__ctr_paes_set_key(ctx) != 0)
return blkcipher_walk_done(desc, walk, -EIO);
}
memcpy(walk->dst.virt.addr, buf, nbytes);
crypto_inc(walk->iv, AES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, 0);
}
return ret;
}
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_desall_crypt(struct blkcipher_desc *desc, long func,
struct s390_des_ctx *ctx,
struct blkcipher_walk *walk)
{
int ret = blkcipher_walk_virt_block(desc, walk, DES_BLOCK_SIZE);
unsigned int n, nbytes;
u8 buf[DES_BLOCK_SIZE], ctrbuf[DES_BLOCK_SIZE];
u8 *out, *in, *ctrptr = ctrbuf;
if (!walk->nbytes)
return ret;
if (spin_trylock(&ctrblk_lock))
ctrptr = ctrblk;
memcpy(ctrptr, walk->iv, DES_BLOCK_SIZE);
while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
out = walk->dst.virt.addr;
in = walk->src.virt.addr;
while (nbytes >= DES_BLOCK_SIZE) {
if (ctrptr == ctrblk)
n = __ctrblk_init(ctrptr, nbytes);
else
n = DES_BLOCK_SIZE;
ret = crypt_s390_kmctr(func, ctx->key, out, in,
n, ctrptr);
if (ret < 0 || ret != n) {
if (ctrptr == ctrblk)
spin_unlock(&ctrblk_lock);
return -EIO;
}
if (n > DES_BLOCK_SIZE)
memcpy(ctrptr, ctrptr + n - DES_BLOCK_SIZE,
DES_BLOCK_SIZE);
crypto_inc(ctrptr, DES_BLOCK_SIZE);
out += n;
in += n;
nbytes -= n;
}
ret = blkcipher_walk_done(desc, walk, nbytes);
}
if (ctrptr == ctrblk) {
if (nbytes)
memcpy(ctrbuf, ctrptr, DES_BLOCK_SIZE);
else
memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);
spin_unlock(&ctrblk_lock);
} else {
if (!nbytes)
memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);
}
/* final block may be < DES_BLOCK_SIZE, copy only nbytes */
if (nbytes) {
out = walk->dst.virt.addr;
in = walk->src.virt.addr;
ret = crypt_s390_kmctr(func, ctx->key, buf, in,
DES_BLOCK_SIZE, ctrbuf);
if (ret < 0 || ret != DES_BLOCK_SIZE)
return -EIO;
memcpy(out, buf, nbytes);
crypto_inc(ctrbuf, DES_BLOCK_SIZE);
ret = blkcipher_walk_done(desc, walk, 0);
memcpy(walk->iv, ctrbuf, DES_BLOCK_SIZE);
}
return ret;
}
