[CRYPTO] api: Added crypto_type support

This patch adds the crypto_type structure which will be used for all new
crypto algorithm types, beginning with block ciphers.

The primary purpose of this abstraction is to allow different crypto_type
objects for crypto algorithms of the same type, in particular, there will
be a different crypto_type objects for asynchronous algorithms.

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

1 files changed, 23 insertions, 9 deletions

diff --git a/crypto/api.c b/crypto/api.c
index bc4b7901acdf..edaa843d8e83 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -226,17 +226,18 @@ static int crypto_init_flags(struct crypto_tfm *tfm, u32 flags)
                 
         case CRYPTO_ALG_TYPE_COMPRESS:
                 return crypto_init_compress_flags(tfm, flags);
-        
-        default:
-                break;
         }
         
-        BUG();
-        return -EINVAL;
+        return 0;
 }
 
 static int crypto_init_ops(struct crypto_tfm *tfm)
 {
+        const struct crypto_type *type = tfm->__crt_alg->cra_type;
+
+        if (type)
+                return type->init(tfm);
+
         switch (crypto_tfm_alg_type(tfm)) {
         case CRYPTO_ALG_TYPE_CIPHER:
                 return crypto_init_cipher_ops(tfm);
@@ -257,6 +258,14 @@ static int crypto_init_ops(struct crypto_tfm *tfm)
 
 static void crypto_exit_ops(struct crypto_tfm *tfm)
 {
+        const struct crypto_type *type = tfm->__crt_alg->cra_type;
+
+        if (type) {
+                if (type->exit)
+                        type->exit(tfm);
+                return;
+        }
+
         switch (crypto_tfm_alg_type(tfm)) {
         case CRYPTO_ALG_TYPE_CIPHER:
                 crypto_exit_cipher_ops(tfm);
@@ -278,26 +287,31 @@ static void crypto_exit_ops(struct crypto_tfm *tfm)
 
 static unsigned int crypto_ctxsize(struct crypto_alg *alg, int flags)
 {
+        const struct crypto_type *type = alg->cra_type;
         unsigned int len;
 
+        len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
+        if (type)
+                return len + type->ctxsize(alg);
+
         switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
         default:
                 BUG();
 
         case CRYPTO_ALG_TYPE_CIPHER:
-                len = crypto_cipher_ctxsize(alg, flags);
+                len += crypto_cipher_ctxsize(alg, flags);
                 break;
                 
         case CRYPTO_ALG_TYPE_DIGEST:
-                len = crypto_digest_ctxsize(alg, flags);
+                len += crypto_digest_ctxsize(alg, flags);
                 break;
                 
         case CRYPTO_ALG_TYPE_COMPRESS:
-                len = crypto_compress_ctxsize(alg, flags);
+                len += crypto_compress_ctxsize(alg, flags);
                 break;
         }
 
-        return len + (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
+        return len;
 }
 
 void crypto_shoot_alg(struct crypto_alg *alg)