crypto: eseqiv - Move IV seeding into init function

We currently do the IV seeding on the first givencrypt call in order to conserve entropy. However, this does not work with DRBG which cannot be called from interrupt context. In fact, with DRBG we don't need to conserve entropy anyway. So this patch moves the seeding into the init function. Signed-off-by: Herbert Xu <[email protected]>
sfionov · Jun 4, 2015 · 4ce43ce · 4ce43ce
1 parent f261c5f
commit 4ce43ce
Showing 1 changed file with 4 additions and 25 deletions.
diff --git a/crypto/eseqiv.c b/crypto/eseqiv.c
@@ -146,29 +146,6 @@ static int eseqiv_givencrypt(struct skcipher_givcrypt_request *req)
 	return err;
 }
 
-static int eseqiv_givencrypt_first(struct skcipher_givcrypt_request *req)
-{
-	struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
-	struct eseqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
-	int err = 0;
-
-	spin_lock_bh(&ctx->lock);
-	if (crypto_ablkcipher_crt(geniv)->givencrypt != eseqiv_givencrypt_first)
-		goto unlock;
-
-	crypto_ablkcipher_crt(geniv)->givencrypt = eseqiv_givencrypt;
-	err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
-				   crypto_ablkcipher_ivsize(geniv));
-
-unlock:
-	spin_unlock_bh(&ctx->lock);
-
-	if (err)
-		return err;
-
-	return eseqiv_givencrypt(req);
-}
-
 static int eseqiv_init(struct crypto_tfm *tfm)
 {
 	struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
@@ -198,7 +175,9 @@ static int eseqiv_init(struct crypto_tfm *tfm)
 	tfm->crt_ablkcipher.reqsize = reqsize +
 				      sizeof(struct ablkcipher_request);
 
-	return skcipher_geniv_init(tfm);
+	return crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
+				    crypto_ablkcipher_ivsize(geniv)) ?:
+	       skcipher_geniv_init(tfm);
 }
 
 static struct crypto_template eseqiv_tmpl;
@@ -220,7 +199,7 @@ static struct crypto_instance *eseqiv_alloc(struct rtattr **tb)
 	if (inst->alg.cra_ablkcipher.ivsize != inst->alg.cra_blocksize)
 		goto free_inst;
 
-	inst->alg.cra_ablkcipher.givencrypt = eseqiv_givencrypt_first;
+	inst->alg.cra_ablkcipher.givencrypt = eseqiv_givencrypt;
 
 	inst->alg.cra_init = eseqiv_init;
 	inst->alg.cra_exit = skcipher_geniv_exit;