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Diffstat (limited to 'arch/s390/crypto/des_s390.c')
-rw-r--r--arch/s390/crypto/des_s390.c154
1 files changed, 57 insertions, 97 deletions
diff --git a/arch/s390/crypto/des_s390.c b/arch/s390/crypto/des_s390.c
index 965587eefc39..8b83144206eb 100644
--- a/arch/s390/crypto/des_s390.c
+++ b/arch/s390/crypto/des_s390.c
@@ -85,57 +85,46 @@ static struct crypto_alg des_alg = {
}
};
-static int ecb_desall_crypt(struct blkcipher_desc *desc, long func,
- u8 *key, struct blkcipher_walk *walk)
+static int ecb_desall_crypt(struct blkcipher_desc *desc, unsigned long fc,
+ struct blkcipher_walk *walk)
{
- int ret = blkcipher_walk_virt(desc, walk);
- unsigned int nbytes;
+ struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ unsigned int nbytes, n;
+ int ret;
- while ((nbytes = walk->nbytes)) {
+ ret = blkcipher_walk_virt(desc, walk);
+ while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
/* only use complete blocks */
- unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
- u8 *out = walk->dst.virt.addr;
- u8 *in = walk->src.virt.addr;
-
- cpacf_km(func, key, out, in, n);
-
- nbytes &= DES_BLOCK_SIZE - 1;
- ret = blkcipher_walk_done(desc, walk, nbytes);
+ n = nbytes & ~(DES_BLOCK_SIZE - 1);
+ cpacf_km(fc, ctx->key, walk->dst.virt.addr,
+ walk->src.virt.addr, n);
+ ret = blkcipher_walk_done(desc, walk, nbytes - n);
}
-
return ret;
}
-static int cbc_desall_crypt(struct blkcipher_desc *desc, long func,
+static int cbc_desall_crypt(struct blkcipher_desc *desc, unsigned long fc,
struct blkcipher_walk *walk)
{
struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
- int ret = blkcipher_walk_virt(desc, walk);
- unsigned int nbytes = walk->nbytes;
+ unsigned int nbytes, n;
+ int ret;
struct {
u8 iv[DES_BLOCK_SIZE];
u8 key[DES3_KEY_SIZE];
} param;
- if (!nbytes)
- goto out;
-
+ ret = blkcipher_walk_virt(desc, walk);
memcpy(param.iv, walk->iv, DES_BLOCK_SIZE);
memcpy(param.key, ctx->key, DES3_KEY_SIZE);
- do {
+ while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
/* only use complete blocks */
- unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
- u8 *out = walk->dst.virt.addr;
- u8 *in = walk->src.virt.addr;
-
- cpacf_kmc(func, &param, out, in, n);
-
- nbytes &= DES_BLOCK_SIZE - 1;
- ret = blkcipher_walk_done(desc, walk, nbytes);
- } while ((nbytes = walk->nbytes));
+ n = nbytes & ~(DES_BLOCK_SIZE - 1);
+ cpacf_kmc(fc, &param, walk->dst.virt.addr,
+ walk->src.virt.addr, n);
+ ret = blkcipher_walk_done(desc, walk, nbytes - n);
+ }
memcpy(walk->iv, param.iv, DES_BLOCK_SIZE);
-
-out:
return ret;
}
@@ -143,23 +132,20 @@ static int ecb_des_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ecb_desall_crypt(desc, CPACF_KM_DEA, ctx->key, &walk);
+ return ecb_desall_crypt(desc, CPACF_KM_DEA, &walk);
}
static int ecb_des_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ecb_desall_crypt(desc, CPACF_KM_DEA | CPACF_DECRYPT,
- ctx->key, &walk);
+ return ecb_desall_crypt(desc, CPACF_KM_DEA | CPACF_DECRYPT, &walk);
}
static struct crypto_alg ecb_des_alg = {
@@ -290,23 +276,21 @@ static int ecb_des3_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ecb_desall_crypt(desc, CPACF_KM_TDEA_192, ctx->key, &walk);
+ return ecb_desall_crypt(desc, CPACF_KM_TDEA_192, &walk);
}
static int ecb_des3_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ecb_desall_crypt(desc, CPACF_KM_TDEA_192 | CPACF_DECRYPT,
- ctx->key, &walk);
+ &walk);
}
static struct crypto_alg ecb_des3_alg = {
@@ -371,73 +355,54 @@ static struct crypto_alg cbc_des3_alg = {
}
};
-static unsigned int __ctrblk_init(u8 *ctrptr, unsigned int nbytes)
+static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
{
unsigned int i, n;
/* align to block size, max. PAGE_SIZE */
n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(DES_BLOCK_SIZE - 1);
- for (i = DES_BLOCK_SIZE; i < n; i += DES_BLOCK_SIZE) {
- memcpy(ctrptr + i, ctrptr + i - DES_BLOCK_SIZE, DES_BLOCK_SIZE);
- crypto_inc(ctrptr + i, DES_BLOCK_SIZE);
+ memcpy(ctrptr, iv, DES_BLOCK_SIZE);
+ for (i = (n / DES_BLOCK_SIZE) - 1; i > 0; i--) {
+ memcpy(ctrptr + DES_BLOCK_SIZE, ctrptr, DES_BLOCK_SIZE);
+ crypto_inc(ctrptr + DES_BLOCK_SIZE, DES_BLOCK_SIZE);
+ ctrptr += DES_BLOCK_SIZE;
}
return n;
}
-static int ctr_desall_crypt(struct blkcipher_desc *desc, long func,
- struct s390_des_ctx *ctx,
+static int ctr_desall_crypt(struct blkcipher_desc *desc, unsigned long fc,
struct blkcipher_walk *walk)
{
- int ret = blkcipher_walk_virt_block(desc, walk, DES_BLOCK_SIZE);
+ struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
+ u8 buf[DES_BLOCK_SIZE], *ctrptr;
unsigned int n, nbytes;
- u8 buf[DES_BLOCK_SIZE], ctrbuf[DES_BLOCK_SIZE];
- u8 *out, *in, *ctrptr = ctrbuf;
-
- if (!walk->nbytes)
- return ret;
+ int ret, locked;
- if (spin_trylock(&ctrblk_lock))
- ctrptr = ctrblk;
+ locked = spin_trylock(&ctrblk_lock);
- memcpy(ctrptr, walk->iv, DES_BLOCK_SIZE);
+ ret = blkcipher_walk_virt_block(desc, walk, 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;
- cpacf_kmctr(func, ctx->key, out, in, n, ctrptr);
- 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);
+ 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 (ctrptr == ctrblk) {
- if (nbytes)
- memcpy(ctrbuf, ctrptr, DES_BLOCK_SIZE);
- else
- memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);
+ if (locked)
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;
- cpacf_kmctr(func, ctx->key, buf, in, DES_BLOCK_SIZE, ctrbuf);
- memcpy(out, buf, nbytes);
- crypto_inc(ctrbuf, DES_BLOCK_SIZE);
+ 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);
- memcpy(walk->iv, ctrbuf, DES_BLOCK_SIZE);
}
return ret;
}
@@ -446,23 +411,20 @@ static int ctr_des_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ctr_desall_crypt(desc, CPACF_KMCTR_DEA, ctx, &walk);
+ return ctr_desall_crypt(desc, CPACF_KMCTR_DEA, &walk);
}
static int ctr_des_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ctr_desall_crypt(desc, CPACF_KMCTR_DEA | CPACF_DECRYPT,
- ctx, &walk);
+ return ctr_desall_crypt(desc, CPACF_KMCTR_DEA | CPACF_DECRYPT, &walk);
}
static struct crypto_alg ctr_des_alg = {
@@ -490,23 +452,21 @@ static int ctr_des3_encrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ctr_desall_crypt(desc, CPACF_KMCTR_TDEA_192, ctx, &walk);
+ return ctr_desall_crypt(desc, CPACF_KMCTR_TDEA_192, &walk);
}
static int ctr_des3_decrypt(struct blkcipher_desc *desc,
struct scatterlist *dst, struct scatterlist *src,
unsigned int nbytes)
{
- struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
struct blkcipher_walk walk;
blkcipher_walk_init(&walk, dst, src, nbytes);
return ctr_desall_crypt(desc, CPACF_KMCTR_TDEA_192 | CPACF_DECRYPT,
- ctx, &walk);
+ &walk);
}
static struct crypto_alg ctr_des3_alg = {
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-20 10:24:26 +0000