On 12.10.19 22:18, Eric Biggers wrote:
> From: Eric Biggers <ebigg...@google.com>
>
> 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: Eric Biggers <ebigg...@google.com>
> ---
> arch/s390/crypto/aes_s390.c | 609 ++++++++++++++----------------------
> 1 file changed, 234 insertions(+), 375 deletions(-)
>
> diff --git a/arch/s390/crypto/aes_s390.c b/arch/s390/crypto/aes_s390.c
> index 9803e96d2924..ead0b2c9881d 100644
> --- a/arch/s390/crypto/aes_s390.c
> +++ b/arch/s390/crypto/aes_s390.c
> @@ -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,
> - unsigned int len)
> +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;
> -
> - crypto_sync_skcipher_clear_flags(sctx->fallback.blk,
> - CRYPTO_TFM_REQ_MASK);
> - crypto_sync_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags &
> - 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);
> + struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
> + int ret;
>
> - skcipher_request_zero(req);
> + 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);
> + 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 = {
> - .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 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, ¶m,
> - 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 = {
> - .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 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,
> - unsigned int len)
> -{
> - struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
> - unsigned int ret;
> -
> - crypto_sync_skcipher_clear_flags(xts_ctx->fallback,
> - 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)
> +static int xts_fallback_setkey(struct crypto_skcipher *tfm, const u8 *key,
> + unsigned int len)
> {
> - 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);
> + struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
> + int ret;
>
> - skcipher_request_zero(req);
> + 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);
> + 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 = {
> - .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 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 = {
> - .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,
> - }
> - }
> +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,
> @@ -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;
> }
Tested with extended selftests and own tests via AF_ALG interface, works.
Thanks for this great work.
Reviewed-by: Harald Freudenberger <fre...@linux.ibm.com>
