crypto: x86/glue_helper - add skcipher_walk functions

Add ECB, CBC, and CTR functions to glue_helper which use skcipher_walk
rather than blkcipher_walk.  This will allow converting the remaining
x86 algorithms from the blkcipher interface over to the skcipher
interface, after which we'll be able to remove the blkcipher_walk
versions of these functions.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/glue_helper.c

@@ -90,6 +90,52 @@ int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
 }
 EXPORT_SYMBOL_GPL(glue_ecb_crypt_128bit);
 
+int glue_ecb_req_128bit(const struct common_glue_ctx *gctx,
+			struct skcipher_request *req)
+{
+	void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+	const unsigned int bsize = 128 / 8;
+	struct skcipher_walk walk;
+	bool fpu_enabled = false;
+	unsigned int nbytes;
+	int err;
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes)) {
+		const u8 *src = walk.src.virt.addr;
+		u8 *dst = walk.dst.virt.addr;
+		unsigned int func_bytes;
+		unsigned int i;
+
+		fpu_enabled = glue_skwalk_fpu_begin(bsize,
+						    gctx->fpu_blocks_limit,
+						    &walk, fpu_enabled, nbytes);
+		for (i = 0; i < gctx->num_funcs; i++) {
+			func_bytes = bsize * gctx->funcs[i].num_blocks;
+
+			if (nbytes < func_bytes)
+				continue;
+
+			/* Process multi-block batch */
+			do {
+				gctx->funcs[i].fn_u.ecb(ctx, dst, src);
+				src += func_bytes;
+				dst += func_bytes;
+				nbytes -= func_bytes;
+			} while (nbytes >= func_bytes);
+
+			if (nbytes < bsize)
+				break;
+		}
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	glue_fpu_end(fpu_enabled);
+	return err;
+}
+EXPORT_SYMBOL_GPL(glue_ecb_req_128bit);
+
 static unsigned int __glue_cbc_encrypt_128bit(const common_glue_func_t fn,
 					      struct blkcipher_desc *desc,
 					      struct blkcipher_walk *walk)
@@ -135,6 +181,38 @@ int glue_cbc_encrypt_128bit(const common_glue_func_t fn,
 }
 EXPORT_SYMBOL_GPL(glue_cbc_encrypt_128bit);
 
+int glue_cbc_encrypt_req_128bit(const common_glue_func_t fn,
+				struct skcipher_request *req)
+{
+	void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+	const unsigned int bsize = 128 / 8;
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int err;
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes)) {
+		const u128 *src = (u128 *)walk.src.virt.addr;
+		u128 *dst = (u128 *)walk.dst.virt.addr;
+		u128 *iv = (u128 *)walk.iv;
+
+		do {
+			u128_xor(dst, src, iv);
+			fn(ctx, (u8 *)dst, (u8 *)dst);
+			iv = dst;
+			src++;
+			dst++;
+			nbytes -= bsize;
+		} while (nbytes >= bsize);
+
+		*(u128 *)walk.iv = *iv;
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+	return err;
+}
+EXPORT_SYMBOL_GPL(glue_cbc_encrypt_req_128bit);
+
 static unsigned int
 __glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
 			  struct blkcipher_desc *desc,
@@ -211,6 +289,67 @@ int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
 }
 EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit);
 
+int glue_cbc_decrypt_req_128bit(const struct common_glue_ctx *gctx,
+				struct skcipher_request *req)
+{
+	void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+	const unsigned int bsize = 128 / 8;
+	struct skcipher_walk walk;
+	bool fpu_enabled = false;
+	unsigned int nbytes;
+	int err;
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes)) {
+		const u128 *src = walk.src.virt.addr;
+		u128 *dst = walk.dst.virt.addr;
+		unsigned int func_bytes, num_blocks;
+		unsigned int i;
+		u128 last_iv;
+
+		fpu_enabled = glue_skwalk_fpu_begin(bsize,
+						    gctx->fpu_blocks_limit,
+						    &walk, fpu_enabled, nbytes);
+		/* Start of the last block. */
+		src += nbytes / bsize - 1;
+		dst += nbytes / bsize - 1;
+
+		last_iv = *src;
+
+		for (i = 0; i < gctx->num_funcs; i++) {
+			num_blocks = gctx->funcs[i].num_blocks;
+			func_bytes = bsize * num_blocks;
+
+			if (nbytes < func_bytes)
+				continue;
+
+			/* Process multi-block batch */
+			do {
+				src -= num_blocks - 1;
+				dst -= num_blocks - 1;
+
+				gctx->funcs[i].fn_u.cbc(ctx, dst, src);
+
+				nbytes -= func_bytes;
+				if (nbytes < bsize)
+					goto done;
+
+				u128_xor(dst, dst, --src);
+				dst--;
+			} while (nbytes >= func_bytes);
+		}
+done:
+		u128_xor(dst, dst, (u128 *)walk.iv);
+		*(u128 *)walk.iv = last_iv;
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	glue_fpu_end(fpu_enabled);
+	return err;
+}
+EXPORT_SYMBOL_GPL(glue_cbc_decrypt_req_128bit);
+
 static void glue_ctr_crypt_final_128bit(const common_glue_ctr_func_t fn_ctr,
 					struct blkcipher_desc *desc,
 					struct blkcipher_walk *walk)
@@ -301,6 +440,74 @@ int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
 }
 EXPORT_SYMBOL_GPL(glue_ctr_crypt_128bit);
 
+int glue_ctr_req_128bit(const struct common_glue_ctx *gctx,
+			struct skcipher_request *req)
+{
+	void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
+	const unsigned int bsize = 128 / 8;
+	struct skcipher_walk walk;
+	bool fpu_enabled = false;
+	unsigned int nbytes;
+	int err;
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes) >= bsize) {
+		const u128 *src = walk.src.virt.addr;
+		u128 *dst = walk.dst.virt.addr;
+		unsigned int func_bytes, num_blocks;
+		unsigned int i;
+		le128 ctrblk;
+
+		fpu_enabled = glue_skwalk_fpu_begin(bsize,
+						    gctx->fpu_blocks_limit,
+						    &walk, fpu_enabled, nbytes);
+
+		be128_to_le128(&ctrblk, (be128 *)walk.iv);
+
+		for (i = 0; i < gctx->num_funcs; i++) {
+			num_blocks = gctx->funcs[i].num_blocks;
+			func_bytes = bsize * num_blocks;
+
+			if (nbytes < func_bytes)
+				continue;
+
+			/* Process multi-block batch */
+			do {
+				gctx->funcs[i].fn_u.ctr(ctx, dst, src, &ctrblk);
+				src += num_blocks;
+				dst += num_blocks;
+				nbytes -= func_bytes;
+			} while (nbytes >= func_bytes);
+
+			if (nbytes < bsize)
+				break;
+		}
+
+		le128_to_be128((be128 *)walk.iv, &ctrblk);
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	glue_fpu_end(fpu_enabled);
+
+	if (nbytes) {
+		le128 ctrblk;
+		u128 tmp;
+
+		be128_to_le128(&ctrblk, (be128 *)walk.iv);
+		memcpy(&tmp, walk.src.virt.addr, nbytes);
+		gctx->funcs[gctx->num_funcs - 1].fn_u.ctr(ctx, &tmp, &tmp,
+							  &ctrblk);
+		memcpy(walk.dst.virt.addr, &tmp, nbytes);
+		le128_to_be128((be128 *)walk.iv, &ctrblk);
+
+		err = skcipher_walk_done(&walk, 0);
+	}
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(glue_ctr_req_128bit);
+
 static unsigned int __glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
 					    void *ctx,
 					    struct blkcipher_desc *desc,

arch/x86/include/asm/crypto/glue_helper.h

@@ -131,23 +131,35 @@ extern int glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
 				 struct scatterlist *dst,
 				 struct scatterlist *src, unsigned int nbytes);
 
+extern int glue_ecb_req_128bit(const struct common_glue_ctx *gctx,
+			       struct skcipher_request *req);
+
 extern int glue_cbc_encrypt_128bit(const common_glue_func_t fn,
 				   struct blkcipher_desc *desc,
 				   struct scatterlist *dst,
 				   struct scatterlist *src,
 				   unsigned int nbytes);
 
+extern int glue_cbc_encrypt_req_128bit(const common_glue_func_t fn,
+				       struct skcipher_request *req);
+
 extern int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
 				   struct blkcipher_desc *desc,
 				   struct scatterlist *dst,
 				   struct scatterlist *src,
 				   unsigned int nbytes);
 
+extern int glue_cbc_decrypt_req_128bit(const struct common_glue_ctx *gctx,
+				       struct skcipher_request *req);
+
 extern int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
 				 struct blkcipher_desc *desc,
 				 struct scatterlist *dst,
 				 struct scatterlist *src, unsigned int nbytes);
 
+extern int glue_ctr_req_128bit(const struct common_glue_ctx *gctx,
+			       struct skcipher_request *req);
+
 extern int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
 				 struct blkcipher_desc *desc,
 				 struct scatterlist *dst,