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Message-Id: <20230426191147.60610-5-dtsen@linux.ibm.com>
Date: Wed, 26 Apr 2023 15:11:46 -0400
From: Danny Tsen <dtsen@...ux.ibm.com>
To: linux-crypto@...r.kernel.org
Cc: herbert@...dor.apana.org.au, leitao@...ian.org,
nayna@...ux.ibm.com, appro@...ptogams.org,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
mpe@...erman.id.au, ltcgcw@...ux.vnet.ibm.com, dtsen@...ibm.com,
Danny Tsen <dtsen@...ux.ibm.com>
Subject: [PATCH v2 4/5] Glue code for optmized Poly1305 implementation for ppc64le.
Signed-off-by: Danny Tsen <dtsen@...ux.ibm.com>
---
arch/powerpc/crypto/poly1305-p10-glue.c | 186 ++++++++++++++++++++++++
1 file changed, 186 insertions(+)
create mode 100644 arch/powerpc/crypto/poly1305-p10-glue.c
diff --git a/arch/powerpc/crypto/poly1305-p10-glue.c b/arch/powerpc/crypto/poly1305-p10-glue.c
new file mode 100644
index 000000000000..95dd708573ee
--- /dev/null
+++ b/arch/powerpc/crypto/poly1305-p10-glue.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Poly1305 authenticator algorithm, RFC7539.
+ *
+ * Copyright 2023- IBM Corp. All rights reserved.
+ */
+
+#include <crypto/algapi.h>
+#include <linux/crypto.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/jump_label.h>
+#include <crypto/internal/hash.h>
+#include <crypto/internal/poly1305.h>
+#include <crypto/internal/simd.h>
+#include <linux/cpufeature.h>
+#include <asm/unaligned.h>
+#include <asm/simd.h>
+#include <asm/switch_to.h>
+
+asmlinkage void poly1305_p10le_4blocks(void *h, const u8 *m, u32 mlen);
+asmlinkage void poly1305_64s(void *h, const u8 *m, u32 mlen, int highbit);
+asmlinkage void poly1305_emit_64(void *h, void *s, u8 *dst);
+
+static void vsx_begin(void)
+{
+ preempt_disable();
+ enable_kernel_vsx();
+}
+
+static void vsx_end(void)
+{
+ disable_kernel_vsx();
+ preempt_enable();
+}
+
+static int crypto_poly1305_p10_init(struct shash_desc *desc)
+{
+ struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
+
+ poly1305_core_init(&dctx->h);
+ dctx->buflen = 0;
+ dctx->rset = 0;
+ dctx->sset = false;
+
+ return 0;
+}
+
+static unsigned int crypto_poly1305_setdctxkey(struct poly1305_desc_ctx *dctx,
+ const u8 *inp, unsigned int len)
+{
+ unsigned int acc = 0;
+
+ if (unlikely(!dctx->sset)) {
+ if (!dctx->rset && len >= POLY1305_BLOCK_SIZE) {
+ struct poly1305_core_key *key = &dctx->core_r;
+
+ key->key.r64[0] = get_unaligned_le64(&inp[0]);
+ key->key.r64[1] = get_unaligned_le64(&inp[8]);
+ inp += POLY1305_BLOCK_SIZE;
+ len -= POLY1305_BLOCK_SIZE;
+ acc += POLY1305_BLOCK_SIZE;
+ dctx->rset = 1;
+ }
+ if (len >= POLY1305_BLOCK_SIZE) {
+ dctx->s[0] = get_unaligned_le32(&inp[0]);
+ dctx->s[1] = get_unaligned_le32(&inp[4]);
+ dctx->s[2] = get_unaligned_le32(&inp[8]);
+ dctx->s[3] = get_unaligned_le32(&inp[12]);
+ acc += POLY1305_BLOCK_SIZE;
+ dctx->sset = true;
+ }
+ }
+ return acc;
+}
+
+static int crypto_poly1305_p10_update(struct shash_desc *desc,
+ const u8 *src, unsigned int srclen)
+{
+ struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
+ unsigned int bytes, used;
+
+ if (unlikely(dctx->buflen)) {
+ bytes = min(srclen, POLY1305_BLOCK_SIZE - dctx->buflen);
+ memcpy(dctx->buf + dctx->buflen, src, bytes);
+ src += bytes;
+ srclen -= bytes;
+ dctx->buflen += bytes;
+
+ if (dctx->buflen == POLY1305_BLOCK_SIZE) {
+ if (likely(!crypto_poly1305_setdctxkey(dctx, dctx->buf,
+ POLY1305_BLOCK_SIZE))) {
+ vsx_begin();
+ poly1305_64s(&dctx->h, dctx->buf,
+ POLY1305_BLOCK_SIZE, 1);
+ vsx_end();
+ }
+ dctx->buflen = 0;
+ }
+ }
+
+ if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
+ bytes = round_down(srclen, POLY1305_BLOCK_SIZE);
+ used = crypto_poly1305_setdctxkey(dctx, src, bytes);
+ if (likely(used)) {
+ srclen -= used;
+ src += used;
+ }
+ if (crypto_simd_usable() && (srclen >= POLY1305_BLOCK_SIZE*4)) {
+ vsx_begin();
+ poly1305_p10le_4blocks(&dctx->h, src, srclen);
+ vsx_end();
+ src += srclen - (srclen % (POLY1305_BLOCK_SIZE * 4));
+ srclen %= POLY1305_BLOCK_SIZE * 4;
+ }
+ while (srclen >= POLY1305_BLOCK_SIZE) {
+ vsx_begin();
+ poly1305_64s(&dctx->h, src, POLY1305_BLOCK_SIZE, 1);
+ vsx_end();
+ srclen -= POLY1305_BLOCK_SIZE;
+ src += POLY1305_BLOCK_SIZE;
+ }
+ }
+
+ if (unlikely(srclen)) {
+ dctx->buflen = srclen;
+ memcpy(dctx->buf, src, srclen);
+ }
+
+ return 0;
+}
+
+static int crypto_poly1305_p10_final(struct shash_desc *desc, u8 *dst)
+{
+ struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
+
+ if (unlikely(!dctx->sset))
+ return -ENOKEY;
+
+ if ((dctx->buflen)) {
+ dctx->buf[dctx->buflen++] = 1;
+ memset(dctx->buf + dctx->buflen, 0,
+ POLY1305_BLOCK_SIZE - dctx->buflen);
+ vsx_begin();
+ poly1305_64s(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 0);
+ vsx_end();
+ dctx->buflen = 0;
+ }
+
+ poly1305_emit_64(&dctx->h, &dctx->s, dst);
+ return 0;
+}
+
+static struct shash_alg poly1305_alg = {
+ .digestsize = POLY1305_DIGEST_SIZE,
+ .init = crypto_poly1305_p10_init,
+ .update = crypto_poly1305_p10_update,
+ .final = crypto_poly1305_p10_final,
+ .descsize = sizeof(struct poly1305_desc_ctx),
+ .base = {
+ .cra_name = "poly1305",
+ .cra_driver_name = "poly1305-p10",
+ .cra_priority = 300,
+ .cra_blocksize = POLY1305_BLOCK_SIZE,
+ .cra_module = THIS_MODULE,
+ },
+};
+
+static int __init poly1305_p10_init(void)
+{
+ return crypto_register_shash(&poly1305_alg);
+}
+
+static void __exit poly1305_p10_exit(void)
+{
+ crypto_unregister_shash(&poly1305_alg);
+}
+
+module_cpu_feature_match(PPC_MODULE_FEATURE_P10, poly1305_p10_init);
+module_exit(poly1305_p10_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Danny Tsen <dtsen@...ux.ibm.com>");
+MODULE_DESCRIPTION("Optimized Poly1305 for P10");
+MODULE_ALIAS_CRYPTO("poly1305");
+MODULE_ALIAS_CRYPTO("poly1305-p10");
--
2.31.1
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