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-rw-r--r--arch/powerpc/crypto/aes.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/arch/powerpc/crypto/aes.c b/arch/powerpc/crypto/aes.c
new file mode 100644
index 0000000000..ec06189fbf
--- /dev/null
+++ b/arch/powerpc/crypto/aes.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AES routines supporting VMX instructions on the Power 8
+ *
+ * Copyright (C) 2015 International Business Machines Inc.
+ *
+ * Author: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/crypto.h>
+#include <linux/delay.h>
+#include <asm/simd.h>
+#include <asm/switch_to.h>
+#include <crypto/aes.h>
+#include <crypto/internal/cipher.h>
+#include <crypto/internal/simd.h>
+
+#include "aesp8-ppc.h"
+
+struct p8_aes_ctx {
+ struct crypto_cipher *fallback;
+ struct aes_key enc_key;
+ struct aes_key dec_key;
+};
+
+static int p8_aes_init(struct crypto_tfm *tfm)
+{
+ const char *alg = crypto_tfm_alg_name(tfm);
+ struct crypto_cipher *fallback;
+ struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(fallback)) {
+ printk(KERN_ERR
+ "Failed to allocate transformation for '%s': %ld\n",
+ alg, PTR_ERR(fallback));
+ return PTR_ERR(fallback);
+ }
+
+ crypto_cipher_set_flags(fallback,
+ crypto_cipher_get_flags((struct
+ crypto_cipher *)
+ tfm));
+ ctx->fallback = fallback;
+
+ return 0;
+}
+
+static void p8_aes_exit(struct crypto_tfm *tfm)
+{
+ struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (ctx->fallback) {
+ crypto_free_cipher(ctx->fallback);
+ ctx->fallback = NULL;
+ }
+}
+
+static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ int ret;
+ struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ 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_cipher_setkey(ctx->fallback, key, keylen);
+
+ return ret ? -EINVAL : 0;
+}
+
+static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (!crypto_simd_usable()) {
+ crypto_cipher_encrypt_one(ctx->fallback, dst, src);
+ } else {
+ preempt_disable();
+ pagefault_disable();
+ enable_kernel_vsx();
+ aes_p8_encrypt(src, dst, &ctx->enc_key);
+ disable_kernel_vsx();
+ pagefault_enable();
+ preempt_enable();
+ }
+}
+
+static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
+{
+ struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ if (!crypto_simd_usable()) {
+ crypto_cipher_decrypt_one(ctx->fallback, dst, src);
+ } else {
+ preempt_disable();
+ pagefault_disable();
+ enable_kernel_vsx();
+ aes_p8_decrypt(src, dst, &ctx->dec_key);
+ disable_kernel_vsx();
+ pagefault_enable();
+ preempt_enable();
+ }
+}
+
+struct crypto_alg p8_aes_alg = {
+ .cra_name = "aes",
+ .cra_driver_name = "p8_aes",
+ .cra_module = THIS_MODULE,
+ .cra_priority = 1000,
+ .cra_type = NULL,
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
+ .cra_alignmask = 0,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct p8_aes_ctx),
+ .cra_init = p8_aes_init,
+ .cra_exit = p8_aes_exit,
+ .cra_cipher = {
+ .cia_min_keysize = AES_MIN_KEY_SIZE,
+ .cia_max_keysize = AES_MAX_KEY_SIZE,
+ .cia_setkey = p8_aes_setkey,
+ .cia_encrypt = p8_aes_encrypt,
+ .cia_decrypt = p8_aes_decrypt,
+ },
+};