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Diffstat (limited to 'arch/s390/crypto/aes_s390.c')
-rw-r--r--arch/s390/crypto/aes_s390.c196
1 files changed, 79 insertions, 117 deletions
diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c
index f4ad96ebb7e9..303d28eb03a2 100644
--- a/arch/s390/crypto/aes_s390.c
+++ b/arch/s390/crypto/aes_s390.c
@@ -46,14 +46,6 @@ struct s390_aes_ctx {
} fallback;
};
-struct pcc_param {
- u8 key[32];
- u8 tweak[16];
- u8 block[16];
- u8 bit[16];
- u8 xts[16];
-};
-
struct s390_xts_ctx {
u8 key[32];
u8 pcc_key[32];
@@ -248,22 +240,20 @@ static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
return 0;
}
-static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
+static int ecb_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
struct blkcipher_walk *walk)
{
- int ret = blkcipher_walk_virt(desc, walk);
- unsigned int nbytes;
+ struct s390_aes_ctx *sctx = 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) >= AES_BLOCK_SIZE) {
/* only use complete blocks */
- unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
- u8 *out = walk->dst.virt.addr;
- u8 *in = walk->src.virt.addr;
-
- cpacf_km(func, param, out, in, n);
-
- nbytes &= AES_BLOCK_SIZE - 1;
- ret = blkcipher_walk_done(desc, walk, nbytes);
+ 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);
}
return ret;
@@ -280,7 +270,7 @@ static int ecb_aes_encrypt(struct blkcipher_desc *desc,
return fallback_blk_enc(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ecb_aes_crypt(desc, sctx->fc, sctx->key, &walk);
+ return ecb_aes_crypt(desc, 0, &walk);
}
static int ecb_aes_decrypt(struct blkcipher_desc *desc,
@@ -294,7 +284,7 @@ static int ecb_aes_decrypt(struct blkcipher_desc *desc,
return fallback_blk_dec(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ecb_aes_crypt(desc, sctx->fc | CPACF_DECRYPT, sctx->key, &walk);
+ return ecb_aes_crypt(desc, CPACF_DECRYPT, &walk);
}
static int fallback_init_blk(struct crypto_tfm *tfm)
@@ -366,36 +356,28 @@ static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
return 0;
}
-static int cbc_aes_crypt(struct blkcipher_desc *desc, long func,
+static int cbc_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
struct blkcipher_walk *walk)
{
struct s390_aes_ctx *sctx = 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[AES_BLOCK_SIZE];
u8 key[AES_MAX_KEY_SIZE];
} param;
- if (!nbytes)
- goto out;
-
+ ret = blkcipher_walk_virt(desc, walk);
memcpy(param.iv, walk->iv, AES_BLOCK_SIZE);
memcpy(param.key, sctx->key, sctx->key_len);
- do {
+ while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
/* only use complete blocks */
- unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
- u8 *out = walk->dst.virt.addr;
- u8 *in = walk->src.virt.addr;
-
- cpacf_kmc(func, &param, out, in, n);
-
- nbytes &= AES_BLOCK_SIZE - 1;
- ret = blkcipher_walk_done(desc, walk, nbytes);
- } while ((nbytes = walk->nbytes));
+ 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);
+ }
memcpy(walk->iv, param.iv, AES_BLOCK_SIZE);
-
-out:
return ret;
}
@@ -410,7 +392,7 @@ static int cbc_aes_encrypt(struct blkcipher_desc *desc,
return fallback_blk_enc(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
- return cbc_aes_crypt(desc, sctx->fc, &walk);
+ return cbc_aes_crypt(desc, 0, &walk);
}
static int cbc_aes_decrypt(struct blkcipher_desc *desc,
@@ -424,7 +406,7 @@ static int cbc_aes_decrypt(struct blkcipher_desc *desc,
return fallback_blk_dec(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
- return cbc_aes_crypt(desc, sctx->fc | CPACF_DECRYPT, &walk);
+ return cbc_aes_crypt(desc, CPACF_DECRYPT, &walk);
}
static struct crypto_alg cbc_aes_alg = {
@@ -536,46 +518,43 @@ 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, long func,
- struct s390_xts_ctx *xts_ctx,
+static int xts_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
struct blkcipher_walk *walk)
{
- unsigned int offset = xts_ctx->key_len & 0x10;
- int ret = blkcipher_walk_virt(desc, walk);
- unsigned int nbytes = walk->nbytes;
- unsigned int n;
- u8 *in, *out;
- struct pcc_param pcc_param;
+ struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
+ 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 (!nbytes)
- goto out;
-
+ ret = blkcipher_walk_virt(desc, walk);
+ 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);
- /* remove decipher modifier bit from 'func' and call PCC */
- cpacf_pcc(func & 0x7f, &pcc_param.key[offset]);
+ 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);
- do {
+
+ while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
/* only use complete blocks */
n = nbytes & ~(AES_BLOCK_SIZE - 1);
- out = walk->dst.virt.addr;
- in = walk->src.virt.addr;
-
- cpacf_km(func, &xts_param.key[offset], out, in, n);
-
- nbytes &= AES_BLOCK_SIZE - 1;
- ret = blkcipher_walk_done(desc, walk, nbytes);
- } while ((nbytes = walk->nbytes));
-out:
+ 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);
+ }
return ret;
}
@@ -590,7 +569,7 @@ static int xts_aes_encrypt(struct blkcipher_desc *desc,
return xts_fallback_encrypt(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
- return xts_aes_crypt(desc, xts_ctx->fc, xts_ctx, &walk);
+ return xts_aes_crypt(desc, 0, &walk);
}
static int xts_aes_decrypt(struct blkcipher_desc *desc,
@@ -604,7 +583,7 @@ static int xts_aes_decrypt(struct blkcipher_desc *desc,
return xts_fallback_decrypt(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
- return xts_aes_crypt(desc, xts_ctx->fc | CPACF_DECRYPT, xts_ctx, &walk);
+ return xts_aes_crypt(desc, CPACF_DECRYPT, &walk);
}
static int xts_fallback_init(struct crypto_tfm *tfm)
@@ -676,75 +655,58 @@ static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
return 0;
}
-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;
/* 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 = AES_BLOCK_SIZE; i < n; i += AES_BLOCK_SIZE) {
- memcpy(ctrptr + i, ctrptr + i - AES_BLOCK_SIZE,
- AES_BLOCK_SIZE);
- crypto_inc(ctrptr + i, AES_BLOCK_SIZE);
+ 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 blkcipher_desc *desc, long func,
- struct s390_aes_ctx *sctx, struct blkcipher_walk *walk)
+static int ctr_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
+ struct blkcipher_walk *walk)
{
- int ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
+ struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
+ u8 buf[AES_BLOCK_SIZE], *ctrptr;
unsigned int n, nbytes;
- u8 buf[AES_BLOCK_SIZE], ctrbuf[AES_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, AES_BLOCK_SIZE);
+ ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
- out = walk->dst.virt.addr;
- in = walk->src.virt.addr;
- while (nbytes >= AES_BLOCK_SIZE) {
- if (ctrptr == ctrblk)
- n = __ctrblk_init(ctrptr, nbytes);
- else
- n = AES_BLOCK_SIZE;
- cpacf_kmctr(func, sctx->key, out, in, n, ctrptr);
- if (n > AES_BLOCK_SIZE)
- memcpy(ctrptr, ctrptr + n - AES_BLOCK_SIZE,
- AES_BLOCK_SIZE);
- crypto_inc(ctrptr, AES_BLOCK_SIZE);
- out += n;
- in += n;
- nbytes -= n;
- }
- ret = blkcipher_walk_done(desc, walk, nbytes);
+ 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);
+ if (ctrptr == ctrblk)
+ 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);
}
- if (ctrptr == ctrblk) {
- if (nbytes)
- memcpy(ctrbuf, ctrptr, AES_BLOCK_SIZE);
- else
- memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);
+ if (locked)
spin_unlock(&ctrblk_lock);
- } else {
- if (!nbytes)
- memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);
- }
/*
* final block may be < AES_BLOCK_SIZE, copy only nbytes
*/
if (nbytes) {
- out = walk->dst.virt.addr;
- in = walk->src.virt.addr;
- cpacf_kmctr(func, sctx->key, buf, in, AES_BLOCK_SIZE, ctrbuf);
- memcpy(out, buf, nbytes);
- crypto_inc(ctrbuf, AES_BLOCK_SIZE);
+ 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);
- memcpy(walk->iv, ctrbuf, AES_BLOCK_SIZE);
}
return ret;
@@ -761,7 +723,7 @@ static int ctr_aes_encrypt(struct blkcipher_desc *desc,
return fallback_blk_enc(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ctr_aes_crypt(desc, sctx->fc, sctx, &walk);
+ return ctr_aes_crypt(desc, 0, &walk);
}
static int ctr_aes_decrypt(struct blkcipher_desc *desc,
@@ -775,7 +737,7 @@ static int ctr_aes_decrypt(struct blkcipher_desc *desc,
return fallback_blk_dec(desc, dst, src, nbytes);
blkcipher_walk_init(&walk, dst, src, nbytes);
- return ctr_aes_crypt(desc, sctx->fc | CPACF_DECRYPT, sctx, &walk);
+ return ctr_aes_crypt(desc, CPACF_DECRYPT, &walk);
}
static struct crypto_alg ctr_aes_alg = {
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-24 14:18:01 +0300