Use default ASN.1 for SEED.

The default ASN.1 handling can be used for SEED. This also makes
CMS work with SEED.

PR#4504

Reviewed-by: Rich Salz <rsalz@openssl.org>

crypto/evp/e_seed.c

diff --git a/crypto/evp/e_seed.c b/crypto/evp/e_seed.c
index 6964b1e..3df73ee 100644
--- a/crypto/evp/e_seed.c
+++ b/crypto/evp/e_seed.c
@@ -71,7 +71,8 @@
 } EVP_SEED_KEY;
 
 IMPLEMENT_BLOCK_CIPHER(seed, ks, SEED, EVP_SEED_KEY, NID_seed,
-                       16, 16, 16, 128, 0, seed_init_key, 0, 0, 0, 0)
+                       16, 16, 16, 128, EVP_CIPH_FLAG_DEFAULT_ASN1,
+                       seed_init_key, 0, 0, 0, 0)
 
 static int seed_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                          const unsigned char *iv, int enc)