[PATCH 21/28] crypto: aead - Add skcipher null for IV generators

[Herbert Xu]

This patch adds an skcipher null object alongside the existing
null blkcipher so that IV generators using it can switch over
to skcipher.

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

 crypto/aead.c                   |   10 +++++++++-
 include/crypto/internal/geniv.h |    1 +
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/crypto/aead.c b/crypto/aead.c
index 9b18a1e..1ede34c 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -294,10 +294,15 @@ int aead_init_geniv(struct crypto_aead *aead)
        if (err)
                goto out;
 
+       ctx->sknull = crypto_get_default_null_skcipher2();
+       err = PTR_ERR(ctx->sknull);
+       if (IS_ERR(ctx->sknull))
+               goto out;
+
        ctx->null = crypto_get_default_null_skcipher();
        err = PTR_ERR(ctx->null);
        if (IS_ERR(ctx->null))
-               goto out;
+               goto drop_sknull;
 
        child = crypto_spawn_aead(aead_instance_ctx(inst));
        err = PTR_ERR(child);
@@ -315,6 +320,8 @@ out:
 
 drop_null:
        crypto_put_default_null_skcipher();
+drop_sknull:
+       crypto_put_default_null_skcipher2();
        goto out;
 }
 EXPORT_SYMBOL_GPL(aead_init_geniv);
@@ -325,6 +332,7 @@ void aead_exit_geniv(struct crypto_aead *tfm)
 
        crypto_free_aead(ctx->child);
        crypto_put_default_null_skcipher();
+       crypto_put_default_null_skcipher2();
 }
 EXPORT_SYMBOL_GPL(aead_exit_geniv);
 
diff --git a/include/crypto/internal/geniv.h b/include/crypto/internal/geniv.h
index 5933363..e8447c9 100644
--- a/include/crypto/internal/geniv.h
+++ b/include/crypto/internal/geniv.h
@@ -21,6 +21,7 @@ struct aead_geniv_ctx {
        spinlock_t lock;
        struct crypto_aead *child;
        struct crypto_blkcipher *null;
+       struct crypto_skcipher *sknull;
        u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
 };
 
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