crypto: ccp - Use skcipher for fallback
This patch replaces use of the obsolete ablkcipher with skcipher. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -14,9 +14,8 @@
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/scatterlist.h>
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#include <linux/crypto.h>
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#include <crypto/algapi.h>
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#include <crypto/aes.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include "ccp-crypto.h"
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@ -110,15 +109,12 @@ static int ccp_aes_xts_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
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ctx->u.aes.key_len = key_len / 2;
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sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
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return crypto_ablkcipher_setkey(ctx->u.aes.tfm_ablkcipher, key,
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key_len);
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return crypto_skcipher_setkey(ctx->u.aes.tfm_skcipher, key, key_len);
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}
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static int ccp_aes_xts_crypt(struct ablkcipher_request *req,
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unsigned int encrypt)
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{
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struct crypto_tfm *tfm =
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crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
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struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
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unsigned int unit;
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@ -146,14 +142,19 @@ static int ccp_aes_xts_crypt(struct ablkcipher_request *req,
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if ((unit_size == CCP_XTS_AES_UNIT_SIZE__LAST) ||
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(ctx->u.aes.key_len != AES_KEYSIZE_128)) {
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SKCIPHER_REQUEST_ON_STACK(subreq, ctx->u.aes.tfm_skcipher);
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/* Use the fallback to process the request for any
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* unsupported unit sizes or key sizes
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*/
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ablkcipher_request_set_tfm(req, ctx->u.aes.tfm_ablkcipher);
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ret = (encrypt) ? crypto_ablkcipher_encrypt(req) :
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crypto_ablkcipher_decrypt(req);
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ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(tfm));
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skcipher_request_set_tfm(subreq, ctx->u.aes.tfm_skcipher);
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skcipher_request_set_callback(subreq, req->base.flags,
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NULL, NULL);
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skcipher_request_set_crypt(subreq, req->src, req->dst,
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req->nbytes, req->info);
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ret = encrypt ? crypto_skcipher_encrypt(subreq) :
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crypto_skcipher_decrypt(subreq);
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skcipher_request_zero(subreq);
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return ret;
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}
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@ -192,23 +193,21 @@ static int ccp_aes_xts_decrypt(struct ablkcipher_request *req)
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static int ccp_aes_xts_cra_init(struct crypto_tfm *tfm)
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{
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struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_ablkcipher *fallback_tfm;
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struct crypto_skcipher *fallback_tfm;
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ctx->complete = ccp_aes_xts_complete;
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ctx->u.aes.key_len = 0;
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fallback_tfm = crypto_alloc_ablkcipher(crypto_tfm_alg_name(tfm), 0,
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fallback_tfm = crypto_alloc_skcipher("xts(aes)", 0,
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CRYPTO_ALG_ASYNC |
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CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(fallback_tfm)) {
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pr_warn("could not load fallback driver %s\n",
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crypto_tfm_alg_name(tfm));
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pr_warn("could not load fallback driver xts(aes)\n");
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return PTR_ERR(fallback_tfm);
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}
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ctx->u.aes.tfm_ablkcipher = fallback_tfm;
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ctx->u.aes.tfm_skcipher = fallback_tfm;
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tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx) +
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fallback_tfm->base.crt_ablkcipher.reqsize;
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tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx);
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return 0;
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}
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@ -217,9 +216,7 @@ static void ccp_aes_xts_cra_exit(struct crypto_tfm *tfm)
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{
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struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
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if (ctx->u.aes.tfm_ablkcipher)
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crypto_free_ablkcipher(ctx->u.aes.tfm_ablkcipher);
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ctx->u.aes.tfm_ablkcipher = NULL;
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crypto_free_skcipher(ctx->u.aes.tfm_skcipher);
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}
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static int ccp_register_aes_xts_alg(struct list_head *head,
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@ -17,7 +17,6 @@
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#include <linux/wait.h>
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#include <linux/pci.h>
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#include <linux/ccp.h>
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#include <linux/crypto.h>
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#include <crypto/algapi.h>
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#include <crypto/aes.h>
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#include <crypto/ctr.h>
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@ -69,7 +68,7 @@ static inline struct ccp_crypto_ahash_alg *
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/***** AES related defines *****/
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struct ccp_aes_ctx {
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/* Fallback cipher for XTS with unsupported unit sizes */
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struct crypto_ablkcipher *tfm_ablkcipher;
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struct crypto_skcipher *tfm_skcipher;
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/* Cipher used to generate CMAC K1/K2 keys */
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struct crypto_cipher *tfm_cipher;
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