crypto: skcipher - Add internal state support

Unlike chaining modes such as CBC, stream ciphers other than CTR
usually hold an internal state that must be preserved if the
operation is to be done piecemeal.  This has not been represented
in the API, resulting in the inability to split up stream cipher
operations.

This patch adds the basic representation of an internal state to
skcipher and lskcipher.  In the interest of backwards compatibility,
the default has been set such that existing users are assumed to
be operating in one go as opposed to piecemeal.

With the new API, each lskcipher/skcipher algorithm has a new
attribute called statesize.  For skcipher, this is the size of
the buffer that can be exported or imported similar to ahash.
For lskcipher, instead of providing a buffer of ivsize, the user
now has to provide a buffer of ivsize + statesize.

Each skcipher operation is assumed to be final as they are now,
but this may be overridden with a request flag.  When the override
occurs, the user may then export the partial state and reimport
it later.

For lskcipher operations this is reversed.  All operations are
not final and the state will be exported unless the FINAL bit is
set.  However, the CONT bit still has to be set for the state
to be used.

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

4 files changed, 19 insertions, 13 deletions

diff --git a/crypto/arc4.c b/crypto/arc4.c
index eb3590dc..2150f94e 100644
--- a/crypto/arc4.c
+++ b/crypto/arc4.c
@@ -23,7 +23,7 @@ static int crypto_arc4_setkey(struct crypto_lskcipher *tfm, const u8 *in_key,
 }
 
 static int crypto_arc4_crypt(struct crypto_lskcipher *tfm, const u8 *src,
-			     u8 *dst, unsigned nbytes, u8 *iv, bool final)
+			     u8 *dst, unsigned nbytes, u8 *iv, u32 flags)
 {
 	struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);
 
diff --git a/crypto/cbc.c b/crypto/cbc.c
index 28345b8d..eedddef9 100644
--- a/crypto/cbc.c
+++ b/crypto/cbc.c
@@ -51,9 +51,10 @@ out:
 }
 
 static int crypto_cbc_encrypt(struct crypto_lskcipher *tfm, const u8 *src,
-			      u8 *dst, unsigned len, u8 *iv, bool final)
+			      u8 *dst, unsigned len, u8 *iv, u32 flags)
 {
 	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
+	bool final = flags & CRYPTO_LSKCIPHER_FLAG_FINAL;
 	struct crypto_lskcipher *cipher = *ctx;
 	int rem;
 
@@ -119,9 +120,10 @@ out:
 }
 
 static int crypto_cbc_decrypt(struct crypto_lskcipher *tfm, const u8 *src,
-			      u8 *dst, unsigned len, u8 *iv, bool final)
+			      u8 *dst, unsigned len, u8 *iv, u32 flags)
 {
 	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
+	bool final = flags & CRYPTO_LSKCIPHER_FLAG_FINAL;
 	struct crypto_lskcipher *cipher = *ctx;
 	int rem;
 
diff --git a/crypto/ecb.c b/crypto/ecb.c
index cc7625d1..e3a67789 100644
--- a/crypto/ecb.c
+++ b/crypto/ecb.c
@@ -32,22 +32,24 @@ static int crypto_ecb_crypt(struct crypto_cipher *cipher, const u8 *src,
 }
 
 static int crypto_ecb_encrypt2(struct crypto_lskcipher *tfm, const u8 *src,
-			       u8 *dst, unsigned len, u8 *iv, bool final)
+			       u8 *dst, unsigned len, u8 *iv, u32 flags)
 {
 	struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);
 	struct crypto_cipher *cipher = *ctx;
 
-	return crypto_ecb_crypt(cipher, src, dst, len, final,
+	return crypto_ecb_crypt(cipher, src, dst, len,
+				flags & CRYPTO_LSKCIPHER_FLAG_FINAL,
 				crypto_cipher_alg(cipher)->cia_encrypt);
 }
 
 static int crypto_ecb_decrypt2(struct crypto_lskcipher *tfm, const u8 *src,
-			       u8 *dst, unsigned len, u8 *iv, bool final)
+			       u8 *dst, unsigned len, u8 *iv, u32 flags)
 {
 	struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);
 	struct crypto_cipher *cipher = *ctx;
 
-	return crypto_ecb_crypt(cipher, src, dst, len, final,
+	return crypto_ecb_crypt(cipher, src, dst, len,
+				flags & CRYPTO_LSKCIPHER_FLAG_FINAL,
 				crypto_cipher_alg(cipher)->cia_decrypt);
 }
 
diff --git a/crypto/lskcipher.c b/crypto/lskcipher.c
index 9edc8973..51bcf850 100644
--- a/crypto/lskcipher.c
+++ b/crypto/lskcipher.c
@@ -88,7 +88,7 @@ EXPORT_SYMBOL_GPL(crypto_lskcipher_setkey);
 static int crypto_lskcipher_crypt_unaligned(
 	struct crypto_lskcipher *tfm, const u8 *src, u8 *dst, unsigned len,
 	u8 *iv, int (*crypt)(struct crypto_lskcipher *tfm, const u8 *src,
-			     u8 *dst, unsigned len, u8 *iv, bool final))
+			     u8 *dst, unsigned len, u8 *iv, u32 flags))
 {
 	unsigned ivsize = crypto_lskcipher_ivsize(tfm);
 	unsigned bs = crypto_lskcipher_blocksize(tfm);
@@ -119,7 +119,7 @@ static int crypto_lskcipher_crypt_unaligned(
 			chunk &= ~(cs - 1);
 
 		memcpy(p, src, chunk);
-		err = crypt(tfm, p, p, chunk, tiv, true);
+		err = crypt(tfm, p, p, chunk, tiv, CRYPTO_LSKCIPHER_FLAG_FINAL);
 		if (err)
 			goto out;
 
@@ -143,7 +143,7 @@ static int crypto_lskcipher_crypt(struct crypto_lskcipher *tfm, const u8 *src,
 				  int (*crypt)(struct crypto_lskcipher *tfm,
 					       const u8 *src, u8 *dst,
 					       unsigned len, u8 *iv,
-					       bool final))
+					       u32 flags))
 {
 	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
 	struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);
@@ -156,7 +156,7 @@ static int crypto_lskcipher_crypt(struct crypto_lskcipher *tfm, const u8 *src,
 		goto out;
 	}
 
-	ret = crypt(tfm, src, dst, len, iv, true);
+	ret = crypt(tfm, src, dst, len, iv, CRYPTO_LSKCIPHER_FLAG_FINAL);
 
 out:
 	return crypto_lskcipher_errstat(alg, ret);
@@ -198,7 +198,7 @@ static int crypto_lskcipher_crypt_sg(struct skcipher_request *req,
 				     int (*crypt)(struct crypto_lskcipher *tfm,
 						  const u8 *src, u8 *dst,
 						  unsigned len, u8 *iv,
-						  bool final))
+						  u32 flags))
 {
 	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
 	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
@@ -210,7 +210,9 @@ static int crypto_lskcipher_crypt_sg(struct skcipher_request *req,
 
 	while (walk.nbytes) {
 		err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr,
-			    walk.nbytes, walk.iv, walk.nbytes == walk.total);
+			    walk.nbytes, walk.iv,
+			    walk.nbytes == walk.total ?
+			    CRYPTO_LSKCIPHER_FLAG_FINAL : 0);
 		err = skcipher_walk_done(&walk, err);
 	}