crypto: echainiv - Use common IV generation code

This patch makes use of the new common IV generation code.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/echainiv.c b/crypto/echainiv.c
index 02d054300a9ab84ae36e0b3c8906a9a53db41dca..0f79fc668ad4764996b50b71afb88bf5d06a7327 100644 (file)
--- a/crypto/echainiv.c
+++ b/crypto/echainiv.c
@@ -18,7 +18,7 @@
  *
  */
 
-#include <crypto/internal/aead.h>
+#include <crypto/internal/geniv.h>
 #include <crypto/null.h>
 #include <crypto/rng.h>
 #include <crypto/scatterwalk.h>
@@ -33,39 +33,15 @@
 
 #define MAX_IV_SIZE 16
 
-struct echainiv_request_ctx {
-       struct scatterlist src[2];
-       struct scatterlist dst[2];
-       struct scatterlist ivbuf[2];
-       struct scatterlist *ivsg;
-       struct aead_givcrypt_request subreq;
-};
-
 struct echainiv_ctx {
-       struct crypto_aead *child;
-       spinlock_t lock;
+       /* aead_geniv_ctx must be first the element */
+       struct aead_geniv_ctx geniv;
        struct crypto_blkcipher *null;
        u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
 };
 
 static DEFINE_PER_CPU(u32 [MAX_IV_SIZE / sizeof(u32)], echainiv_iv);
 
-static int echainiv_setkey(struct crypto_aead *tfm,
-                             const u8 *key, unsigned int keylen)
-{
-       struct echainiv_ctx *ctx = crypto_aead_ctx(tfm);
-
-       return crypto_aead_setkey(ctx->child, key, keylen);
-}
-
-static int echainiv_setauthsize(struct crypto_aead *tfm,
-                                 unsigned int authsize)
-{
-       struct echainiv_ctx *ctx = crypto_aead_ctx(tfm);
-
-       return crypto_aead_setauthsize(ctx->child, authsize);
-}
-
 /* We don't care if we get preempted and read/write IVs from the next CPU. */
 static void echainiv_read_iv(u8 *dst, unsigned size)
 {
@@ -90,36 +66,6 @@ static void echainiv_write_iv(const u8 *src, unsigned size)
        }
 }
 
-static void echainiv_encrypt_compat_complete2(struct aead_request *req,
-                                                int err)
-{
-       struct echainiv_request_ctx *rctx = aead_request_ctx(req);
-       struct aead_givcrypt_request *subreq = &rctx->subreq;
-       struct crypto_aead *geniv;
-
-       if (err == -EINPROGRESS)
-               return;
-
-       if (err)
-               goto out;
-
-       geniv = crypto_aead_reqtfm(req);
-       scatterwalk_map_and_copy(subreq->giv, rctx->ivsg, 0,
-                                crypto_aead_ivsize(geniv), 1);
-
-out:
-       kzfree(subreq->giv);
-}
-
-static void echainiv_encrypt_compat_complete(
-       struct crypto_async_request *base, int err)
-{
-       struct aead_request *req = base->data;
-
-       echainiv_encrypt_compat_complete2(req, err);
-       aead_request_complete(req, err);
-}
-
 static void echainiv_encrypt_complete2(struct aead_request *req, int err)
 {
        struct aead_request *subreq = aead_request_ctx(req);
@@ -154,59 +100,6 @@ static void echainiv_encrypt_complete(struct crypto_async_request *base,
        aead_request_complete(req, err);
 }
 
-static int echainiv_encrypt_compat(struct aead_request *req)
-{
-       struct crypto_aead *geniv = crypto_aead_reqtfm(req);
-       struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
-       struct echainiv_request_ctx *rctx = aead_request_ctx(req);
-       struct aead_givcrypt_request *subreq = &rctx->subreq;
-       unsigned int ivsize = crypto_aead_ivsize(geniv);
-       crypto_completion_t compl;
-       void *data;
-       u8 *info;
-       __be64 seq;
-       int err;
-
-       if (req->cryptlen < ivsize)
-               return -EINVAL;
-
-       compl = req->base.complete;
-       data = req->base.data;
-
-       rctx->ivsg = scatterwalk_ffwd(rctx->ivbuf, req->dst, req->assoclen);
-       info = PageHighMem(sg_page(rctx->ivsg)) ? NULL : sg_virt(rctx->ivsg);
-
-       if (!info) {
-               info = kmalloc(ivsize, req->base.flags &
-                                      CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL:
-                                                                 GFP_ATOMIC);
-               if (!info)
-                       return -ENOMEM;
-
-               compl = echainiv_encrypt_compat_complete;
-               data = req;
-       }
-
-       memcpy(&seq, req->iv + ivsize - sizeof(seq), sizeof(seq));
-
-       aead_givcrypt_set_tfm(subreq, ctx->child);
-       aead_givcrypt_set_callback(subreq, req->base.flags,
-                                  req->base.complete, req->base.data);
-       aead_givcrypt_set_crypt(subreq,
-                               scatterwalk_ffwd(rctx->src, req->src,
-                                                req->assoclen + ivsize),
-                               scatterwalk_ffwd(rctx->dst, rctx->ivsg,
-                                                ivsize),
-                               req->cryptlen - ivsize, req->iv);
-       aead_givcrypt_set_assoc(subreq, req->src, req->assoclen);
-       aead_givcrypt_set_giv(subreq, info, be64_to_cpu(seq));
-
-       err = crypto_aead_givencrypt(subreq);
-       if (unlikely(PageHighMem(sg_page(rctx->ivsg))))
-               echainiv_encrypt_compat_complete2(req, err);
-       return err;
-}
-
 static int echainiv_encrypt(struct aead_request *req)
 {
        struct crypto_aead *geniv = crypto_aead_reqtfm(req);
@@ -221,7 +114,7 @@ static int echainiv_encrypt(struct aead_request *req)
        if (req->cryptlen < ivsize)
                return -EINVAL;
 
-       aead_request_set_tfm(subreq, ctx->child);
+       aead_request_set_tfm(subreq, ctx->geniv.child);
 
        compl = echainiv_encrypt_complete;
        data = req;
@@ -264,38 +157,6 @@ static int echainiv_encrypt(struct aead_request *req)
        return err;
 }
 
-static int echainiv_decrypt_compat(struct aead_request *req)
-{
-       struct crypto_aead *geniv = crypto_aead_reqtfm(req);
-       struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
-       struct echainiv_request_ctx *rctx = aead_request_ctx(req);
-       struct aead_request *subreq = &rctx->subreq.areq;
-       crypto_completion_t compl;
-       void *data;
-       unsigned int ivsize = crypto_aead_ivsize(geniv);
-
-       if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
-               return -EINVAL;
-
-       aead_request_set_tfm(subreq, ctx->child);
-
-       compl = req->base.complete;
-       data = req->base.data;
-
-       aead_request_set_callback(subreq, req->base.flags, compl, data);
-       aead_request_set_crypt(subreq,
-                              scatterwalk_ffwd(rctx->src, req->src,
-                                               req->assoclen + ivsize),
-                              scatterwalk_ffwd(rctx->dst, req->dst,
-                                               req->assoclen + ivsize),
-                              req->cryptlen - ivsize, req->iv);
-       aead_request_set_assoc(subreq, req->src, req->assoclen);
-
-       scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0);
-
-       return crypto_aead_decrypt(subreq);
-}
-
 static int echainiv_decrypt(struct aead_request *req)
 {
        struct crypto_aead *geniv = crypto_aead_reqtfm(req);
@@ -308,7 +169,7 @@ static int echainiv_decrypt(struct aead_request *req)
        if (req->cryptlen < ivsize + crypto_aead_authsize(geniv))
                return -EINVAL;
 
-       aead_request_set_tfm(subreq, ctx->child);
+       aead_request_set_tfm(subreq, ctx->geniv.child);
 
        compl = req->base.complete;
        data = req->base.data;
@@ -326,36 +187,13 @@ static int echainiv_decrypt(struct aead_request *req)
        return crypto_aead_decrypt(subreq);
 }
 
-static int echainiv_encrypt_compat_first(struct aead_request *req)
-{
-       struct crypto_aead *geniv = crypto_aead_reqtfm(req);
-       struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
-       int err = 0;
-
-       spin_lock_bh(&ctx->lock);
-       if (geniv->encrypt != echainiv_encrypt_compat_first)
-               goto unlock;
-
-       geniv->encrypt = echainiv_encrypt_compat;
-       err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
-                                  crypto_aead_ivsize(geniv));
-
-unlock:
-       spin_unlock_bh(&ctx->lock);
-
-       if (err)
-               return err;
-
-       return echainiv_encrypt_compat(req);
-}
-
 static int echainiv_encrypt_first(struct aead_request *req)
 {
        struct crypto_aead *geniv = crypto_aead_reqtfm(req);
        struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
        int err = 0;
 
-       spin_lock_bh(&ctx->lock);
+       spin_lock_bh(&ctx->geniv.lock);
        if (geniv->encrypt != echainiv_encrypt_first)
                goto unlock;
 
@@ -364,7 +202,7 @@ static int echainiv_encrypt_first(struct aead_request *req)
                                   crypto_aead_ivsize(geniv));
 
 unlock:
-       spin_unlock_bh(&ctx->lock);
+       spin_unlock_bh(&ctx->geniv.lock);
 
        if (err)
                return err;
@@ -372,31 +210,13 @@ unlock:
        return echainiv_encrypt(req);
 }
 
-static int echainiv_compat_init(struct crypto_tfm *tfm)
-{
-       struct crypto_aead *geniv = __crypto_aead_cast(tfm);
-       struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
-       int err;
-
-       spin_lock_init(&ctx->lock);
-
-       crypto_aead_set_reqsize(geniv, sizeof(struct echainiv_request_ctx));
-
-       err = aead_geniv_init(tfm);
-
-       ctx->child = geniv->child;
-       geniv->child = geniv;
-
-       return err;
-}
-
 static int echainiv_init(struct crypto_tfm *tfm)
 {
        struct crypto_aead *geniv = __crypto_aead_cast(tfm);
        struct echainiv_ctx *ctx = crypto_aead_ctx(geniv);
        int err;
 
-       spin_lock_init(&ctx->lock);
+       spin_lock_init(&ctx->geniv.lock);
 
        crypto_aead_set_reqsize(geniv, sizeof(struct aead_request));
 
@@ -409,7 +229,7 @@ static int echainiv_init(struct crypto_tfm *tfm)
        if (err)
                goto drop_null;
 
-       ctx->child = geniv->child;
+       ctx->geniv.child = geniv->child;
        geniv->child = geniv;
 
 out:
@@ -420,18 +240,11 @@ drop_null:
        goto out;
 }
 
-static void echainiv_compat_exit(struct crypto_tfm *tfm)
-{
-       struct echainiv_ctx *ctx = crypto_tfm_ctx(tfm);
-
-       crypto_free_aead(ctx->child);
-}
-
 static void echainiv_exit(struct crypto_tfm *tfm)
 {
        struct echainiv_ctx *ctx = crypto_tfm_ctx(tfm);
 
-       crypto_free_aead(ctx->child);
+       crypto_free_aead(ctx->geniv.child);
        crypto_put_default_null_skcipher();
 }
 
@@ -448,17 +261,17 @@ static int echainiv_aead_create(struct crypto_template *tmpl,
        if (IS_ERR(inst))
                return PTR_ERR(inst);
 
+       spawn = aead_instance_ctx(inst);
+       alg = crypto_spawn_aead_alg(spawn);
+
+       if (alg->base.cra_aead.encrypt)
+               goto done;
+
        err = -EINVAL;
-       if (inst->alg.ivsize < sizeof(u64) ||
-           inst->alg.ivsize & (sizeof(u32) - 1) ||
+       if (inst->alg.ivsize & (sizeof(u32) - 1) ||
            inst->alg.ivsize > MAX_IV_SIZE)
                goto free_inst;
 
-       spawn = aead_instance_ctx(inst);
-       alg = crypto_spawn_aead_alg(spawn);
-
-       inst->alg.setkey = echainiv_setkey;
-       inst->alg.setauthsize = echainiv_setauthsize;
        inst->alg.encrypt = echainiv_encrypt_first;
        inst->alg.decrypt = echainiv_decrypt;
 
@@ -469,14 +282,7 @@ static int echainiv_aead_create(struct crypto_template *tmpl,
        inst->alg.base.cra_ctxsize = sizeof(struct echainiv_ctx);
        inst->alg.base.cra_ctxsize += inst->alg.base.cra_aead.ivsize;
 
-       if (alg->base.cra_aead.encrypt) {
-               inst->alg.encrypt = echainiv_encrypt_compat_first;
-               inst->alg.decrypt = echainiv_decrypt_compat;
-
-               inst->alg.base.cra_init = echainiv_compat_init;
-               inst->alg.base.cra_exit = echainiv_compat_exit;
-       }
-
+done:
        err = aead_register_instance(tmpl, inst);
        if (err)
                goto free_inst;