crypto: blkcipher - Do not use eseqiv on stream ciphers

Recently we switched to using eseqiv on SMP machines in preference
over chainiv.  However, eseqiv does not support stream ciphers so
they should still default to chainiv.

This patch applies the same check as done by eseqiv to weed out
the stream ciphers.  In particular, all algorithms where the IV
size is not equal to the block size will now default to chainiv.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 03fb5facf0b4..f6f08336df5d 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -183,6 +183,12 @@ EXPORT_SYMBOL_GPL(crypto_givcipher_type);
 
 const char *crypto_default_geniv(const struct crypto_alg *alg)
 {
+        if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
+             CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
+                                         alg->cra_ablkcipher.ivsize) !=
+            alg->cra_blocksize)
+                return "chainiv";
+
         return alg->cra_flags & CRYPTO_ALG_ASYNC ?
                "eseqiv" : skcipher_default_geniv;
 }