1 files changed, 133 insertions, 0 deletions
diff --git a/arch/powerpc/crypto/aes_cbc.c b/arch/powerpc/crypto/aes_cbc.c
new file mode 100644
index 000000000000..ed0debc7acb5
--- /dev/null
+++ b/arch/powerpc/crypto/aes_cbc.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AES CBC routines supporting VMX instructions on the Power 8
+ *
+ * Copyright (C) 2015 International Business Machines Inc.
+ *
+ * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
+ */
+
+#include <asm/simd.h>
+#include <asm/switch_to.h>
+#include <crypto/aes.h>
+#include <crypto/internal/simd.h>
+#include <crypto/internal/skcipher.h>
+
+#include "aesp8-ppc.h"
+
+struct p8_aes_cbc_ctx {
+	struct crypto_skcipher *fallback;
+	struct aes_key enc_key;
+	struct aes_key dec_key;
+};
+
+static int p8_aes_cbc_init(struct crypto_skcipher *tfm)
+{
+	struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct crypto_skcipher *fallback;
+
+	fallback = crypto_alloc_skcipher("cbc(aes)", 0,
+					 CRYPTO_ALG_NEED_FALLBACK |
+					 CRYPTO_ALG_ASYNC);
+	if (IS_ERR(fallback)) {
+		pr_err("Failed to allocate cbc(aes) fallback: %ld\n",
+		       PTR_ERR(fallback));
+		return PTR_ERR(fallback);
+	}
+
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
+				    crypto_skcipher_reqsize(fallback));
+	ctx->fallback = fallback;
+	return 0;
+}
+
+static void p8_aes_cbc_exit(struct crypto_skcipher *tfm)
+{
+	struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	crypto_free_skcipher(ctx->fallback);
+}
+
+static int p8_aes_cbc_setkey(struct crypto_skcipher *tfm, const u8 *key,
+			     unsigned int keylen)
+{
+	struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
+	int ret;
+
+	preempt_disable();
+	pagefault_disable();
+	enable_kernel_vsx();
+	ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
+	ret |= aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
+	disable_kernel_vsx();
+	pagefault_enable();
+	preempt_enable();
+
+	ret |= crypto_skcipher_setkey(ctx->fallback, key, keylen);
+
+	return ret ? -EINVAL : 0;
+}
+
+static int p8_aes_cbc_crypt(struct skcipher_request *req, int enc)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	const struct p8_aes_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int ret;
+
+	if (!crypto_simd_usable()) {
+		struct skcipher_request *subreq = skcipher_request_ctx(req);
+
+		*subreq = *req;
+		skcipher_request_set_tfm(subreq, ctx->fallback);
+		return enc ? crypto_skcipher_encrypt(subreq) :
+			     crypto_skcipher_decrypt(subreq);
+	}
+
+	ret = skcipher_walk_virt(&walk, req, false);
+	while ((nbytes = walk.nbytes) != 0) {
+		preempt_disable();
+		pagefault_disable();
+		enable_kernel_vsx();
+		aes_p8_cbc_encrypt(walk.src.virt.addr,
+				   walk.dst.virt.addr,
+				   round_down(nbytes, AES_BLOCK_SIZE),
+				   enc ? &ctx->enc_key : &ctx->dec_key,
+				   walk.iv, enc);
+		disable_kernel_vsx();
+		pagefault_enable();
+		preempt_enable();
+
+		ret = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE);
+	}
+	return ret;
+}
+
+static int p8_aes_cbc_encrypt(struct skcipher_request *req)
+{
+	return p8_aes_cbc_crypt(req, 1);
+}
+
+static int p8_aes_cbc_decrypt(struct skcipher_request *req)
+{
+	return p8_aes_cbc_crypt(req, 0);
+}
+
+struct skcipher_alg p8_aes_cbc_alg = {
+	.base.cra_name = "cbc(aes)",
+	.base.cra_driver_name = "p8_aes_cbc",
+	.base.cra_module = THIS_MODULE,
+	.base.cra_priority = 2000,
+	.base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
+	.base.cra_blocksize = AES_BLOCK_SIZE,
+	.base.cra_ctxsize = sizeof(struct p8_aes_cbc_ctx),
+	.setkey = p8_aes_cbc_setkey,
+	.encrypt = p8_aes_cbc_encrypt,
+	.decrypt = p8_aes_cbc_decrypt,
+	.init = p8_aes_cbc_init,
+	.exit = p8_aes_cbc_exit,
+	.min_keysize = AES_MIN_KEY_SIZE,
+	.max_keysize = AES_MAX_KEY_SIZE,
+	.ivsize = AES_BLOCK_SIZE,
+};