lib/crypto: poly1305: Consolidate into single module

Consolidate the Poly1305 code into a single module, similar to various
other algorithms (SHA-1, SHA-256, SHA-512, etc.):

- Each arch now provides a header file lib/crypto/$(SRCARCH)/poly1305.h,
  replacing lib/crypto/$(SRCARCH)/poly1305*.c.  The header defines
  poly1305_block_init(), poly1305_blocks(), poly1305_emit(), and
  optionally poly1305_mod_init_arch().  It is included by
  lib/crypto/poly1305.c, and thus the code gets built into the single
  libpoly1305 module, with improved inlining in some cases.

- Whether arch-optimized Poly1305 is buildable is now controlled
  centrally by lib/crypto/Kconfig instead of by
  lib/crypto/$(SRCARCH)/Kconfig.  The conditions for enabling it remain
  the same as before, and it remains enabled by default.  (The PPC64 one
  remains unconditionally disabled due to 'depends on BROKEN'.)

- Any additional arch-specific translation units for the optimized
  Poly1305 code, such as assembly files, are now compiled by
  lib/crypto/Makefile instead of lib/crypto/$(SRCARCH)/Makefile.

A special consideration is needed because the Adiantum code uses the
poly1305_core_*() functions directly.  For now, just carry forward that
approach.  This means retaining the CRYPTO_LIB_POLY1305_GENERIC kconfig
symbol, and keeping the poly1305_core_*() functions in separate
translation units.  So it's not quite as streamlined I've done with the
other hash functions, but we still get a single libpoly1305 module.

Note: to see the diff from the arm, arm64, and x86 .c files to the new
.h files, view this commit with 'git show -M10'.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250829152513.92459-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

5 files changed, 16 insertions, 52 deletions

diff --git a/lib/crypto/mips/Kconfig b/lib/crypto/mips/Kconfig
index 0670a170c1be..94c1a0892c20 100644
--- a/lib/crypto/mips/Kconfig
+++ b/lib/crypto/mips/Kconfig
@@ -5,8 +5,3 @@ config CRYPTO_CHACHA_MIPS
 	depends on CPU_MIPS32_R2
 	default CRYPTO_LIB_CHACHA
 	select CRYPTO_ARCH_HAVE_LIB_CHACHA
-
-config CRYPTO_POLY1305_MIPS
-	tristate
-	default CRYPTO_LIB_POLY1305
-	select CRYPTO_ARCH_HAVE_LIB_POLY1305
diff --git a/lib/crypto/mips/Makefile b/lib/crypto/mips/Makefile
index 804488c7aded..b5ea0e25c21e 100644
--- a/lib/crypto/mips/Makefile
+++ b/lib/crypto/mips/Makefile
@@ -3,17 +3,3 @@
 obj-$(CONFIG_CRYPTO_CHACHA_MIPS) += chacha-mips.o
 chacha-mips-y := chacha-core.o chacha-glue.o
 AFLAGS_chacha-core.o += -O2 # needed to fill branch delay slots
-
-obj-$(CONFIG_CRYPTO_POLY1305_MIPS) += poly1305-mips.o
-poly1305-mips-y := poly1305-core.o poly1305-glue.o
-
-perlasm-flavour-$(CONFIG_32BIT) := o32
-perlasm-flavour-$(CONFIG_64BIT) := 64
-
-quiet_cmd_perlasm = PERLASM $@
-      cmd_perlasm = $(PERL) $(<) $(perlasm-flavour-y) $(@)
-
-$(obj)/poly1305-core.S: $(src)/poly1305-mips.pl FORCE
-	$(call if_changed,perlasm)
-
-targets += poly1305-core.S
diff --git a/lib/crypto/mips/poly1305-glue.c b/lib/crypto/mips/poly1305-glue.c
deleted file mode 100644
index 002f50f710ab..000000000000
--- a/lib/crypto/mips/poly1305-glue.c
+++ /dev/null
@@ -1,27 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * OpenSSL/Cryptogams accelerated Poly1305 transform for MIPS
- *
- * Copyright (C) 2019 Linaro Ltd. <ard.biesheuvel@linaro.org>
- */
-
-#include <crypto/internal/poly1305.h>
-#include <linux/cpufeature.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/unaligned.h>
-
-asmlinkage void poly1305_block_init_arch(
-	struct poly1305_block_state *state,
-	const u8 raw_key[POLY1305_BLOCK_SIZE]);
-EXPORT_SYMBOL_GPL(poly1305_block_init_arch);
-asmlinkage void poly1305_blocks_arch(struct poly1305_block_state *state,
-				     const u8 *src, u32 len, u32 hibit);
-EXPORT_SYMBOL_GPL(poly1305_blocks_arch);
-asmlinkage void poly1305_emit_arch(const struct poly1305_state *state,
-				   u8 digest[POLY1305_DIGEST_SIZE],
-				   const u32 nonce[4]);
-EXPORT_SYMBOL_GPL(poly1305_emit_arch);
-
-MODULE_DESCRIPTION("Poly1305 transform (MIPS accelerated");
-MODULE_LICENSE("GPL v2");
diff --git a/lib/crypto/mips/poly1305-mips.pl b/lib/crypto/mips/poly1305-mips.pl
index 399f10c3e385..71347f34f4f9 100644
--- a/lib/crypto/mips/poly1305-mips.pl
+++ b/lib/crypto/mips/poly1305-mips.pl
@@ -93,9 +93,7 @@ $code.=<<___;
 #endif
 
 #ifdef	__KERNEL__
-# define poly1305_init   poly1305_block_init_arch
-# define poly1305_blocks poly1305_blocks_arch
-# define poly1305_emit   poly1305_emit_arch
+# define poly1305_init   poly1305_block_init
 #endif
 
 #if defined(__MIPSEB__) && !defined(MIPSEB)
@@ -565,9 +563,7 @@ $code.=<<___;
 #endif
 
 #ifdef	__KERNEL__
-# define poly1305_init   poly1305_block_init_arch
-# define poly1305_blocks poly1305_blocks_arch
-# define poly1305_emit   poly1305_emit_arch
+# define poly1305_init   poly1305_block_init
 #endif
 
 #if defined(__MIPSEB__) && !defined(MIPSEB)
diff --git a/lib/crypto/mips/poly1305.h b/lib/crypto/mips/poly1305.h
new file mode 100644
index 000000000000..85de450f1a93
--- /dev/null
+++ b/lib/crypto/mips/poly1305.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * OpenSSL/Cryptogams accelerated Poly1305 transform for MIPS
+ *
+ * Copyright (C) 2019 Linaro Ltd. <ard.biesheuvel@linaro.org>
+ */
+
+asmlinkage void poly1305_block_init(struct poly1305_block_state *state,
+				    const u8 raw_key[POLY1305_BLOCK_SIZE]);
+asmlinkage void poly1305_blocks(struct poly1305_block_state *state,
+				const u8 *src, u32 len, u32 hibit);
+asmlinkage void poly1305_emit(const struct poly1305_state *state,
+			      u8 digest[POLY1305_DIGEST_SIZE],
+			      const u32 nonce[4]);