[PATCH v2 0/3] Implementation of Ascon-Hash256

[PATCH v2 0/3] Implementation of Ascon-Hash256

[Rusydi H. Makarim]

This patch implements Ascon-Hash256. Ascon-Hash256 is a hash function as a part
of the Ascon-Based Lightweight Cryptography Standards for Constrained Devices,
published as NIST SP 800-232 (https://csrc.nist.gov/pubs/sp/800/232/final).

Signed-off-by: Rusydi H. Makarim <rusydi.makarim@kriptograf.id>
---
Changes in v2:
- lib/crypto: fix compilation error of hash_info.c
- lib/crypto: fix build warning of tests/ascon_hash_kunit.c
- Link to v1: https://lore.kernel.org/r/20251215-ascon_hash256-v1-0-24ae735e571e@kriptograf.id

---
Rusydi H. Makarim (3):
      lib/crypto: Add KUnit test vectors for Ascon-Hash256
      lib/crypto: Initial implementation of Ascon-Hash256
      crypto: Crypto API implementation of Ascon-Hash256

 crypto/Kconfig                         |   7 +
 crypto/Makefile                        |   1 +
 crypto/ascon_hash.c                    |  86 ++++++++++++
 include/crypto/ascon_hash.h            |  83 ++++++++++++
 include/crypto/hash_info.h             |   1 +
 include/uapi/linux/hash_info.h         |   1 +
 lib/crypto/Kconfig                     |   8 ++
 lib/crypto/Makefile                    |   5 +
 lib/crypto/ascon_hash.c                | 169 ++++++++++++++++++++++++
 lib/crypto/hash_info.c                 |   2 +
 lib/crypto/tests/Kconfig               |   9 ++
 lib/crypto/tests/Makefile              |   1 +
 lib/crypto/tests/ascon_hash-testvecs.h | 235 +++++++++++++++++++++++++++++++++
 lib/crypto/tests/ascon_hash_kunit.c    |  33 +++++
 14 files changed, 641 insertions(+)
---
base-commit: 92de2d349e02c2dd96d8d1b7016cc78cf80fc085
change-id: 20251214-ascon_hash256-704130f41b29

Best regards,
-- 
Rusydi H. Makarim <rusydi.makarim@kriptograf.id>

[PATCH v2 1/3] lib/crypto: Add KUnit test vectors for Ascon-Hash256

[Rusydi H. Makarim]

Add test vectors to test the implementation correctness.
The test vectors are generated using the Python reference
implementation in https://github.com/meichlseder/pyascon.
The messages are generated using the method rand_bytes()
in scripts/crypto/gen-hash-testvecs.py.

Signed-off-by: Rusydi H. Makarim <rusydi.makarim@kriptograf.id>
---
 include/crypto/ascon_hash.h            |  84 ++++++++++++
 lib/crypto/tests/Kconfig               |   9 ++
 lib/crypto/tests/Makefile              |   1 +
 lib/crypto/tests/ascon_hash-testvecs.h | 235 +++++++++++++++++++++++++++++++++
 lib/crypto/tests/ascon_hash_kunit.c    |  33 +++++
 5 files changed, 362 insertions(+)

diff --git a/include/crypto/ascon_hash.h b/include/crypto/ascon_hash.h
new file mode 100644
index 000000000000..a99ea458a9cc
--- /dev/null
+++ b/include/crypto/ascon_hash.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common values for Ascon-Hash family of algorithms as defined in
+ * NIST SP 800-232 https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-232.pdf
+ */
+#ifndef _CRYPTO_ASCON_HASH_H_
+#define _CRYPTO_ASCON_HASH_H_
+
+#include <linux/types.h>
+
+#define ASCON_STATE_SIZE	40
+#define ASCON_STATE_WORDS	5
+
+#define ASCON_HASH256_DIGEST_SIZE	32
+#define ASCON_HASH256_BLOCK_SIZE	8
+#define ASCON_HASH256_RATE		8
+#define ASCON_HASH256_IV		0x0000080100CC0002ULL
+
+
+/*
+ * State for Ascon-p[320] permutation: 5 64-bit words
+ */
+struct ascon_state {
+	union {
+		__le64 words[ASCON_STATE_WORDS];
+		u8 bytes[ASCON_STATE_SIZE];
+		u64 native_words[ASCON_STATE_WORDS];
+	};
+};
+
+/* Internal context */
+struct __ascon_hash_ctx {
+	struct ascon_state state;
+	u8 absorb_offset;
+};
+
+/**
+ * struct ascon_hash256_ctx - Context for Ascon-Hash256
+ * @ctx: private
+ */
+struct ascon_hash256_ctx {
+	struct __ascon_hash_ctx ctx;
+};
+
+
+/**
+ * ascon_hash256_init() - Initialize a context for Ascon-Hash256
+ * @ctx: The context to initialize
+ *
+ * This begins a new Ascon-Hash256 message digest computation.
+ */
+void ascon_hash256_init(struct ascon_hash256_ctx *ctx);
+
+/**
+ * ascon_hash256_update() - Update an Ascon-Hash256 digest context with input data
+ * @ctx: The context to update; must have been initialized
+ * @in: The input data
+ * @in_len: Length of the input data in bytes
+ */
+void ascon_hash256_update(struct ascon_hash256_ctx *ctx, const u8 *in,
+			  size_t in_len);
+
+/**
+ * ascon_hash256_final() - Finish computing an Ascon-Hash256 message digest
+ * @ctx: The context to finalize; must have been initialized
+ * @out: (output) The resulting Ascon-Hash256 message digest, matching the init
+ *       function that was called.
+ */
+void ascon_hash256_final(struct ascon_hash256_ctx *ctx,
+			 u8 out[ASCON_HASH256_DIGEST_SIZE]);
+
+/**
+ * ascon_hash256() - Compute Ascon-Hash256 digest in one shot
+ * @in: The input data to be digested
+ * @in_len: Length of the input data in bytes
+ * @out: The buffer into which the digest will be stored
+ *
+ * Convenience function that computes an Ascon-Hash256 digest. Use this instead of
+ * the incremental API if you are able to provide all the input at once.
+ */
+void ascon_hash256(const u8 *in, size_t in_len,
+		   u8 out[ASCON_HASH256_DIGEST_SIZE]);
+
+#endif
diff --git a/lib/crypto/tests/Kconfig b/lib/crypto/tests/Kconfig
index 61d435c450bb..e9d10c580ffe 100644
--- a/lib/crypto/tests/Kconfig
+++ b/lib/crypto/tests/Kconfig
@@ -101,6 +101,15 @@ config CRYPTO_LIB_SHA3_KUNIT_TEST
 	  including SHA3-224, SHA3-256, SHA3-384, SHA3-512, SHAKE128 and
 	  SHAKE256.
 
+config CRYPTO_LIB_ASCON_HASH_KUNIT_TEST
+	tristate "KUnit tests for Ascon-Hash" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS || CRYPTO_SELFTESTS
+	select CRYPTO_LIB_BENCHMARK_VISIBLE
+	select CRYPTO_LIB_ASCON_HASH
+	help
+	  KUnit tests for the Ascon-Hash256 cryptographic has functions.
+
 config CRYPTO_LIB_BENCHMARK_VISIBLE
 	bool
 
diff --git a/lib/crypto/tests/Makefile b/lib/crypto/tests/Makefile
index 5109a0651925..59c4f4ef5b22 100644
--- a/lib/crypto/tests/Makefile
+++ b/lib/crypto/tests/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_CRYPTO_LIB_SHA1_KUNIT_TEST) += sha1_kunit.o
 obj-$(CONFIG_CRYPTO_LIB_SHA256_KUNIT_TEST) += sha224_kunit.o sha256_kunit.o
 obj-$(CONFIG_CRYPTO_LIB_SHA512_KUNIT_TEST) += sha384_kunit.o sha512_kunit.o
 obj-$(CONFIG_CRYPTO_LIB_SHA3_KUNIT_TEST) += sha3_kunit.o
+obj-$(CONFIG_CRYPTO_LIB_ASCON_HASH_KUNIT_TEST) += ascon_hash_kunit.o
diff --git a/lib/crypto/tests/ascon_hash-testvecs.h b/lib/crypto/tests/ascon_hash-testvecs.h
new file mode 100644
index 000000000000..b5c0edcf61e6
--- /dev/null
+++ b/lib/crypto/tests/ascon_hash-testvecs.h
@@ -0,0 +1,235 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * The test vectors are generated using the Python reference implementation
+ * in https://github.com/meichlseder/pyascon/tree/master with messages from
+ * the method rand_bytes() in scripts/crypto/gen-hash-testvecs.py
+ */
+
+static const struct {
+	size_t data_len;
+	u8 digest[ASCON_HASH256_DIGEST_SIZE];
+} hash_testvecs[] = {
+	{
+		.data_len = 0,
+		.digest = {
+			0x0b, 0x3b, 0xe5, 0x85, 0x0f, 0x2f, 0x6b, 0x98,
+			0xca, 0xf2, 0x9f, 0x8f, 0xde, 0xa8, 0x9b, 0x64,
+			0xa1, 0xfa, 0x70, 0xaa, 0x24, 0x9b, 0x8f, 0x83,
+			0x9b, 0xd5, 0x3b, 0xaa, 0x30, 0x4d, 0x92, 0xb2,
+		},
+	},
+	{
+		.data_len = 1,
+		.digest = {
+			0xb9, 0xaa, 0x10, 0x34, 0x7a, 0x2e, 0x62, 0x01,
+			0x01, 0xcf, 0xbd, 0x55, 0x8e, 0x8d, 0x85, 0xda,
+			0x97, 0xe8, 0xd0, 0x5c, 0xbf, 0xf3, 0x19, 0xf7,
+			0x54, 0xcd, 0x32, 0xc0, 0xd0, 0x06, 0x72, 0x62,
+		},
+	},
+	{
+		.data_len = 2,
+		.digest = {
+			0xd9, 0x6b, 0x24, 0xe8, 0x0e, 0xaf, 0xd7, 0x43,
+			0x02, 0x76, 0x7e, 0xc3, 0x66, 0xfa, 0x15, 0x69,
+			0xe8, 0x86, 0x3b, 0xcd, 0x3b, 0xa4, 0xda, 0x77,
+			0xf5, 0xc0, 0x9d, 0x01, 0x8e, 0x9c, 0xae, 0xcd,
+		},
+	},
+	{
+		.data_len = 3,
+		.digest = {
+			0xaa, 0x09, 0xac, 0xf6, 0x0f, 0xa1, 0x54, 0xee,
+			0x5c, 0xe6, 0xf9, 0x44, 0xa8, 0x9f, 0xdb, 0x35,
+			0x68, 0x3b, 0x85, 0x15, 0x2f, 0x54, 0x51, 0x7d,
+			0x05, 0x1e, 0xff, 0x4c, 0x23, 0xa3, 0x46, 0x59,
+		},
+	},
+	{
+		.data_len = 16,
+		.digest = {
+			0xba, 0xc9, 0x62, 0x49, 0xba, 0x78, 0x92, 0x5f,
+			0xa8, 0xa9, 0xd3, 0x47, 0x60, 0x09, 0x1e, 0xdb,
+			0x23, 0x38, 0x2f, 0x43, 0x6a, 0x0f, 0x2f, 0xc8,
+			0x33, 0x9c, 0xdb, 0x9e, 0x38, 0x8f, 0xb0, 0x8a
+		},
+	},
+	{
+		.data_len = 32,
+		.digest = {
+			0x57, 0x6c, 0x66, 0xd5, 0xac, 0x36, 0xd2, 0xda,
+			0x14, 0x4f, 0x6e, 0x84, 0xab, 0xc9, 0xd5, 0x9e,
+			0xe4, 0xb2, 0x22, 0x4a, 0x8c, 0x3c, 0xf2, 0xf3,
+			0x2d, 0xbc, 0x6c, 0x96, 0xa0, 0xd4, 0xaf, 0xd3
+		},
+	},
+	{
+		.data_len = 48,
+		.digest = {
+			0x7e, 0x2e, 0xa5, 0x76, 0x69, 0xc9, 0xf1, 0x49,
+			0xb3, 0x89, 0x53, 0xca, 0x8f, 0x27, 0x6b, 0x89,
+			0xdc, 0x92, 0x5b, 0x48, 0x90, 0x8f, 0x19, 0x7c,
+			0xf2, 0x29, 0xa9, 0xde, 0x59, 0x9e, 0x81, 0x27
+		},
+	},
+	{
+		.data_len = 49,
+		.digest = {
+			0xb5, 0x75, 0xe9, 0xd8, 0x67, 0x75, 0xe2, 0x29,
+			0x3b, 0xff, 0x82, 0x14, 0x06, 0xcf, 0x00, 0x4a,
+			0xb2, 0x53, 0x01, 0x6e, 0x03, 0x86, 0xa6, 0x69,
+			0xe3, 0x64, 0x97, 0x56, 0x25, 0x5b, 0xec, 0x4e
+		},
+	},
+	{
+		.data_len = 63,
+		.digest = {
+			0xb3, 0x37, 0xbf, 0xff, 0xf8, 0x0b, 0x2b, 0xd7,
+			0x81, 0x4c, 0xce, 0x9f, 0x4b, 0xa9, 0x71, 0x3c,
+			0x93, 0x75, 0x04, 0x2d, 0x21, 0x66, 0x10, 0x58,
+			0x38, 0x4e, 0xf5, 0xd7, 0xeb, 0xb4, 0xae, 0x62
+		},
+	},
+	{
+		.data_len = 64,
+		.digest = {
+			0x57, 0xfc, 0x23, 0x3d, 0xf3, 0x48, 0xcc, 0xd2,
+			0x41, 0x39, 0xd8, 0x1c, 0x05, 0x5b, 0xa4, 0x63,
+			0x51, 0x0a, 0x77, 0x8e, 0xb5, 0x11, 0x17, 0xd6,
+			0xeb, 0x54, 0x15, 0xae, 0xb8, 0x2d, 0xd3, 0x5f
+		},
+	},
+	{
+		.data_len = 65,
+		.digest = {
+			0xae, 0x4c, 0xaa, 0x95, 0x86, 0x9c, 0xf2, 0x79,
+			0x57, 0x9a, 0xc9, 0x62, 0x8e, 0x60, 0xc4, 0xc8,
+			0x09, 0x3c, 0xc3, 0xbb, 0xdf, 0x35, 0x96, 0x51,
+			0x5d, 0x80, 0x9a, 0x00, 0x6a, 0xfb, 0xb6, 0xa2
+		},
+	},
+	{
+		.data_len = 127,
+		.digest = {
+			0x31, 0x4f, 0xfc, 0x1f, 0xb9, 0xc7, 0x30, 0x36,
+			0xc5, 0x5c, 0x1d, 0x85, 0x50, 0x4d, 0x96, 0x57,
+			0xeb, 0x75, 0xa4, 0xe0, 0x64, 0x89, 0x84, 0xa5,
+			0x34, 0x34, 0x6d, 0x0e, 0xbb, 0x74, 0x3a, 0x48
+		},
+	},
+	{
+		.data_len = 128,
+		.digest = {
+			0x2d, 0x39, 0xbb, 0x6d, 0xef, 0x31, 0x8f, 0x5a,
+			0xec, 0x5a, 0xf5, 0x86, 0xee, 0xec, 0x26, 0x1a,
+			0xc8, 0x38, 0x40, 0xdd, 0xf0, 0xa6, 0xf0, 0x5f,
+			0xf8, 0x92, 0x14, 0x23, 0x40, 0x48, 0x1b, 0x18
+		},
+	},
+	{
+		.data_len = 129,
+		.digest = {
+			0x97, 0xfc, 0xe5, 0xca, 0xa3, 0x62, 0xae, 0xa1,
+			0x3e, 0x62, 0xd6, 0x46, 0x55, 0x50, 0x26, 0xa7,
+			0x33, 0x36, 0x87, 0x68, 0xbc, 0x26, 0x70, 0x05,
+			0x49, 0x83, 0x9c, 0x68, 0x24, 0x1c, 0x3c, 0x44
+		},
+	},
+	{
+		.data_len = 256,
+		.digest = {
+			0x7d, 0x0c, 0x6d, 0xfb, 0x6b, 0x19, 0xc1, 0xe1,
+			0xa3, 0xd4, 0x2a, 0xae, 0x5a, 0xad, 0xaa, 0xc5,
+			0xeb, 0xa6, 0xb2, 0x72, 0xc5, 0x75, 0x9f, 0x27,
+			0x12, 0xd7, 0x7b, 0xb3, 0xc5, 0xb7, 0x2a, 0xe3
+		},
+	},
+	{
+		.data_len = 511,
+		.digest = {
+			0x32, 0x12, 0xb7, 0x28, 0xc2, 0xbc, 0xe7, 0x38,
+			0x8d, 0x0e, 0x52, 0x34, 0x1a, 0xbc, 0xb0, 0xde,
+			0x45, 0x2b, 0x08, 0x41, 0x23, 0xcf, 0x32, 0x7f,
+			0xd5, 0xa7, 0x2f, 0x99, 0xc6, 0xf6, 0x54, 0x33
+		},
+	},
+	{
+		.data_len = 513,
+		.digest = {
+			0x6b, 0x15, 0x49, 0x95, 0x0d, 0xfc, 0x26, 0x1d,
+			0xc5, 0x01, 0x55, 0x5e, 0x0c, 0x7c, 0x80, 0x57,
+			0xbe, 0xce, 0x04, 0x8e, 0x8e, 0x2e, 0x8a, 0xe8,
+			0xeb, 0x2e, 0x89, 0x4b, 0x6c, 0xea, 0x78, 0x71
+		},
+	},
+	{
+		.data_len = 1000,
+		.digest = {
+			0x13, 0x16, 0x77, 0xd5, 0x37, 0x7a, 0x8a, 0x02,
+			0x68, 0xd9, 0xd5, 0x51, 0xf4, 0x08, 0x7c, 0xe0,
+			0xad, 0xa1, 0x61, 0x17, 0x15, 0x57, 0xd8, 0xb6,
+			0x55, 0xee, 0xbb, 0x96, 0xcd, 0xdd, 0xd2, 0x0d
+		},
+	},
+	{
+		.data_len = 3333,
+		.digest = {
+			0x28, 0x15, 0xde, 0x05, 0x06, 0x68, 0xbc, 0xfe,
+			0xb1, 0x07, 0x72, 0x26, 0xa2, 0x31, 0x8f, 0xe0,
+			0xe9, 0x1a, 0x36, 0x00, 0x51, 0xd8, 0x85, 0xc9,
+			0xb9, 0x67, 0x55, 0x93, 0xe3, 0x02, 0x02, 0x5c
+		},
+	},
+	{
+		.data_len = 4096,
+		.digest = {
+			0x9b, 0x12, 0x0c, 0x12, 0xca, 0x22, 0x84, 0xd3,
+			0xc1, 0x5b, 0x0f, 0x2d, 0xee, 0x58, 0xc4, 0x67,
+			0x03, 0xf7, 0x6c, 0x28, 0xfa, 0xd1, 0x5d, 0x85,
+			0xd9, 0x4b, 0x4f, 0xb2, 0x8c, 0x36, 0x35, 0x53
+		},
+	},
+	{
+		.data_len = 4128,
+		.digest = {
+			0xe4, 0x4d, 0x10, 0xb1, 0x02, 0x62, 0x86, 0xca,
+			0x65, 0x0b, 0xcd, 0xe3, 0x62, 0x96, 0x67, 0xfc,
+			0x59, 0x12, 0x1d, 0x44, 0xed, 0x7b, 0xfb, 0x87,
+			0x82, 0xca, 0xdb, 0xcb, 0xe1, 0x93, 0xaa, 0xa6
+		},
+	},
+	{
+		.data_len = 4160,
+		.digest = {
+			0xe3, 0x03, 0x5e, 0x95, 0x5d, 0xf0, 0x6b, 0xe2,
+			0x30, 0x01, 0x56, 0xf2, 0x6b, 0x18, 0x15, 0xf4,
+			0xa0, 0x42, 0x33, 0xc4, 0x0b, 0xb9, 0xc2, 0xad,
+			0x98, 0xe7, 0x53, 0x2c, 0x8e, 0x8a, 0x1c, 0x02
+		},
+	},
+	{
+		.data_len = 4224,
+		.digest = {
+			0x22, 0x2b, 0x62, 0x2c, 0x21, 0x61, 0xd1, 0x23,
+			0x92, 0x9c, 0x8d, 0x07, 0x48, 0x4a, 0x25, 0x16,
+			0x34, 0x6f, 0x74, 0x3f, 0xbe, 0xf4, 0x7c, 0x1b,
+			0xea, 0xb9, 0x2a, 0x36, 0xc7, 0x3c, 0x1a, 0x32
+		},
+	},
+	{
+		.data_len = 16384,
+		.digest = {
+			0xe9, 0xe2, 0x04, 0xa1, 0x93, 0x8a, 0x7d, 0x6b,
+			0x18, 0x64, 0x38, 0xc5, 0x88, 0x41, 0x98, 0x68,
+			0xaf, 0xc3, 0xbb, 0xa5, 0x5f, 0x92, 0x12, 0xcb,
+			0x0e, 0x31, 0xdf, 0xe9, 0xc1, 0xfb, 0x5a, 0x23
+		},
+	},
+};
+
+static const u8 hash_testvec_consolidated[ASCON_HASH256_DIGEST_SIZE] = {
+	0x48, 0xae, 0x81, 0x92, 0x91, 0xc4, 0x32, 0xba,
+	0xe4, 0x96, 0x5d, 0xb7, 0xf1, 0xb6, 0xad, 0x10,
+	0xae, 0x09, 0x4a, 0x0b, 0xe1, 0xa7, 0x59, 0xa4,
+	0xfd, 0xcb, 0x47, 0x28, 0xfc, 0x0a, 0x34, 0x26,
+};
diff --git a/lib/crypto/tests/ascon_hash_kunit.c b/lib/crypto/tests/ascon_hash_kunit.c
new file mode 100644
index 000000000000..2ca15dbab2cb
--- /dev/null
+++ b/lib/crypto/tests/ascon_hash_kunit.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2025 Rusydi H. Makarim <rusydi.makarim@kriptograf.id>
+ */
+
+#include <crypto/ascon_hash.h>
+#include "ascon_hash-testvecs.h"
+
+#define HASH		ascon_hash256
+#define HASH_CTX	ascon_hash256_ctx
+#define HASH_SIZE	ASCON_HASH256_DIGEST_SIZE
+#define HASH_INIT	ascon_hash256_init
+#define HASH_UPDATE	ascon_hash256_update
+#define HASH_FINAL	ascon_hash256_final
+
+#include "hash-test-template.h"
+
+static struct kunit_case hash_test_cases[] = {
+	HASH_KUNIT_CASES,
+	KUNIT_CASE(benchmark_hash),
+	{},
+};
+
+static struct kunit_suite hash_test_suite = {
+	.name = "ascon_hash256",
+	.test_cases = hash_test_cases,
+	.suite_init = hash_suite_init,
+	.suite_exit = hash_suite_exit,
+};
+kunit_test_suite(hash_test_suite);
+
+MODULE_DESCRIPTION("KUnit tests and benchmark for Ascon-Hash256");
+MODULE_LICENSE("GPL");

-- 
2.52.0

[PATCH v2 2/3] lib/crypto: Initial implementation of Ascon-Hash256

[Rusydi H. Makarim]

initial implementation of Ascon-Hash256

Signed-off-by: Rusydi H. Makarim <rusydi.makarim@kriptograf.id>
---
 include/crypto/ascon_hash.h    |   1 -
 include/crypto/hash_info.h     |   1 +
 include/uapi/linux/hash_info.h |   1 +
 lib/crypto/Kconfig             |   8 ++
 lib/crypto/Makefile            |   5 ++
 lib/crypto/ascon_hash.c        | 169 +++++++++++++++++++++++++++++++++++++++++
 lib/crypto/hash_info.c         |   2 +
 7 files changed, 186 insertions(+), 1 deletion(-)

diff --git a/include/crypto/ascon_hash.h b/include/crypto/ascon_hash.h
index a99ea458a9cc..7fbe345b6ed1 100644
--- a/include/crypto/ascon_hash.h
+++ b/include/crypto/ascon_hash.h
@@ -16,7 +16,6 @@
 #define ASCON_HASH256_RATE		8
 #define ASCON_HASH256_IV		0x0000080100CC0002ULL
 
-
 /*
  * State for Ascon-p[320] permutation: 5 64-bit words
  */
diff --git a/include/crypto/hash_info.h b/include/crypto/hash_info.h
index d6927739f8b2..ccbaabca3e7b 100644
--- a/include/crypto/hash_info.h
+++ b/include/crypto/hash_info.h
@@ -13,6 +13,7 @@
 #include <crypto/sha3.h>
 #include <crypto/md5.h>
 #include <crypto/streebog.h>
+#include <crypto/ascon_hash.h>
 
 #include <uapi/linux/hash_info.h>
 
diff --git a/include/uapi/linux/hash_info.h b/include/uapi/linux/hash_info.h
index 0af23ec196d8..d39b5d48f14a 100644
--- a/include/uapi/linux/hash_info.h
+++ b/include/uapi/linux/hash_info.h
@@ -38,6 +38,7 @@ enum hash_algo {
 	HASH_ALGO_SHA3_256,
 	HASH_ALGO_SHA3_384,
 	HASH_ALGO_SHA3_512,
+	HASH_ALGO_ASCON_HASH256,
 	HASH_ALGO__LAST
 };
 
diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig
index 6871a41e5069..5f39ed6746de 100644
--- a/lib/crypto/Kconfig
+++ b/lib/crypto/Kconfig
@@ -223,6 +223,14 @@ config CRYPTO_LIB_SHA3_ARCH
 	default y if ARM64 && KERNEL_MODE_NEON
 	default y if S390
 
+config CRYPTO_LIB_ASCON_HASH
+	tristate
+	select CRYPTO_LIB_UTILS
+	help
+	  The Ascon-Hash library functions. Select this if your module uses any of
+	  the functions from <crypto/ascon_hash.h>
+
+
 config CRYPTO_LIB_SM3
 	tristate
 
diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile
index 330ab65b29c4..6657ea3d8771 100644
--- a/lib/crypto/Makefile
+++ b/lib/crypto/Makefile
@@ -297,6 +297,11 @@ endif # CONFIG_CRYPTO_LIB_SHA3_ARCH
 
 ################################################################################
 
+obj-$(CONFIG_CRYPTO_LIB_ASCON_HASH) += libascon_hash.o
+libascon_hash-y := ascon_hash.o
+
+################################################################################
+
 obj-$(CONFIG_MPILIB) += mpi/
 
 obj-$(CONFIG_CRYPTO_SELFTESTS_FULL)		+= simd.o
diff --git a/lib/crypto/ascon_hash.c b/lib/crypto/ascon_hash.c
new file mode 100644
index 000000000000..6b88499b8f11
--- /dev/null
+++ b/lib/crypto/ascon_hash.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Ascon-Hash library functions
+ *
+ * Copyright (c) 2025 Rusydi H. Makarim <rusydi.makarim@kriptograf.id>
+ */
+
+#include <linux/module.h>
+#include <crypto/ascon_hash.h>
+#include <crypto/utils.h>
+
+
+/*
+ * The standard of Ascon permutation in NIST SP 800-232 specifies 16 round
+ * constants to accomodate potential functionality extensions in the future
+ * (see page 2).
+ */
+static const u64 ascon_p_rndc[] = {
+	0x000000000000003cULL, 0x000000000000002dULL, 0x000000000000001eULL,
+	0x000000000000000fULL, 0x00000000000000f0ULL, 0x00000000000000e1ULL,
+	0x00000000000000d2ULL, 0x00000000000000c3ULL, 0x00000000000000b4ULL,
+	0x00000000000000a5ULL, 0x0000000000000096ULL, 0x0000000000000087ULL,
+	0x0000000000000078ULL, 0x0000000000000069ULL, 0x000000000000005aULL,
+	0x000000000000004bULL,
+};
+
+
+static inline void ascon_round(u64 s[ASCON_STATE_WORDS], u64 C)
+{
+	u64 t[ASCON_STATE_WORDS];
+
+	// pC
+	s[2] ^= C;
+
+	// pS
+	s[0] ^= s[4];
+	s[4] ^= s[3];
+	s[2] ^= s[1];
+	t[0] = s[0] ^ (~s[1] & s[2]);
+	t[1] = s[1] ^ (~s[2] & s[3]);
+	t[2] = s[2] ^ (~s[3] & s[4]);
+	t[3] = s[3] ^ (~s[4] & s[0]);
+	t[4] = s[4] ^ (~s[0] & s[1]);
+	t[1] ^= t[0];
+	t[0] ^= t[4];
+	t[3] ^= t[2];
+	t[2] = ~t[2];
+
+	// pL
+	s[0] = t[0] ^ ror64(t[0], 19) ^ ror64(t[0], 28);
+	s[1] = t[1] ^ ror64(t[1], 61) ^ ror64(t[1], 39);
+	s[2] = t[2] ^ ror64(t[2],  1) ^ ror64(t[2], 6);
+	s[3] = t[3] ^ ror64(t[3], 10) ^ ror64(t[3], 17);
+	s[4] = t[4] ^ ror64(t[4],  7) ^ ror64(t[4], 41);
+}
+
+static inline void ascon_p12_generic(struct ascon_state *state)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(state->words); ++i)
+		state->native_words[i] = le64_to_cpu(state->words[i]);
+
+	for (i = 0; i < 12; ++i)
+		ascon_round(state->native_words, ascon_p_rndc[16 - 12 + i]);
+
+	for (i = 0; i < ARRAY_SIZE(state->words); ++i)
+		state->words[i] = cpu_to_le64(state->native_words[i]);
+}
+
+static void __maybe_unused ascon_hash256_absorb_blocks_generic(
+	struct ascon_state *state, const u8 *in, size_t nblocks)
+{
+	do {
+		for (size_t i = 0; i < ASCON_HASH256_BLOCK_SIZE; i += 8)
+			state->words[i / 8] ^= get_unaligned((__le64 *)&in[i]);
+		ascon_p12_generic(state);
+		in += ASCON_HASH256_BLOCK_SIZE;
+	} while (--nblocks);
+}
+
+#define ascon_p12 ascon_p12_generic
+#define ascon_hash256_absorb_blocks ascon_hash256_absorb_blocks_generic
+
+void ascon_hash256_init(struct ascon_hash256_ctx *asc_hash256_ctx)
+{
+	struct __ascon_hash_ctx *ctx = &asc_hash256_ctx->ctx;
+
+	ctx->state.words[0] = ASCON_HASH256_IV;
+	ctx->state.words[1] = 0;
+	ctx->state.words[2] = 0;
+	ctx->state.words[3] = 0;
+	ctx->state.words[4] = 0;
+	ctx->absorb_offset = 0;
+	ascon_p12(&ctx->state);
+}
+EXPORT_SYMBOL_GPL(ascon_hash256_init);
+
+void ascon_hash256_update(struct ascon_hash256_ctx *asc_hash256_ctx, const u8 *in,
+			    size_t in_len)
+{
+	struct __ascon_hash_ctx *ctx = &asc_hash256_ctx->ctx;
+	u8 absorb_offset = ctx->absorb_offset;
+
+	WARN_ON_ONCE(absorb_offset >= ASCON_HASH256_BLOCK_SIZE);
+
+	if (absorb_offset && absorb_offset + in_len >= ASCON_HASH256_BLOCK_SIZE) {
+		crypto_xor(&ctx->state.bytes[absorb_offset], in,
+			   ASCON_HASH256_BLOCK_SIZE - absorb_offset);
+		in += ASCON_HASH256_BLOCK_SIZE - absorb_offset;
+		in_len -= ASCON_HASH256_BLOCK_SIZE - absorb_offset;
+		ascon_p12(&ctx->state);
+		absorb_offset = 0;
+	}
+
+	if (in_len >= ASCON_HASH256_BLOCK_SIZE) {
+		size_t nblocks = in_len / ASCON_HASH256_BLOCK_SIZE;
+
+		ascon_hash256_absorb_blocks(&ctx->state, in, nblocks);
+		in += nblocks * ASCON_HASH256_BLOCK_SIZE;
+		in_len -= nblocks * ASCON_HASH256_BLOCK_SIZE;
+	}
+
+	if (in_len) {
+		crypto_xor(&ctx->state.bytes[absorb_offset], in, in_len);
+		absorb_offset += in_len;
+
+	}
+	ctx->absorb_offset = absorb_offset;
+}
+EXPORT_SYMBOL_GPL(ascon_hash256_update);
+
+void ascon_hash256_final(struct ascon_hash256_ctx *asc_hash256_ctx,
+			   u8 out[ASCON_HASH256_DIGEST_SIZE])
+{
+	struct __ascon_hash_ctx *ctx = &asc_hash256_ctx->ctx;
+
+	// padding
+	ctx->state.bytes[ctx->absorb_offset] ^= 0x01;
+	ascon_p12(&ctx->state);
+
+	// squeezing
+	size_t len = ASCON_HASH256_DIGEST_SIZE;
+
+	while (len > ASCON_HASH256_RATE) {
+		memcpy(out, ctx->state.bytes, ASCON_HASH256_RATE);
+		ascon_p12(&ctx->state);
+		out += ASCON_HASH256_RATE;
+		len -= ASCON_HASH256_RATE;
+	}
+	memcpy(out, ctx->state.bytes, ASCON_HASH256_RATE);
+	memzero_explicit(asc_hash256_ctx, sizeof(*asc_hash256_ctx));
+}
+EXPORT_SYMBOL_GPL(ascon_hash256_final);
+
+
+void ascon_hash256(const u8 *in, size_t in_len,
+		   u8 out[ASCON_HASH256_DIGEST_SIZE])
+{
+	struct ascon_hash256_ctx ctx;
+
+	ascon_hash256_init(&ctx);
+	ascon_hash256_update(&ctx, in, in_len);
+	ascon_hash256_final(&ctx, out);
+}
+EXPORT_SYMBOL_GPL(ascon_hash256);
+
+MODULE_DESCRIPTION("Ascon-Hash256 library functions");
+MODULE_LICENSE("GPL");
diff --git a/lib/crypto/hash_info.c b/lib/crypto/hash_info.c
index 9a467638c971..49ce182c6d08 100644
--- a/lib/crypto/hash_info.c
+++ b/lib/crypto/hash_info.c
@@ -32,6 +32,7 @@ const char *const hash_algo_name[HASH_ALGO__LAST] = {
 	[HASH_ALGO_SHA3_256]    = "sha3-256",
 	[HASH_ALGO_SHA3_384]    = "sha3-384",
 	[HASH_ALGO_SHA3_512]    = "sha3-512",
+	[HASH_ALGO_ASCON_HASH256] = "ascon-hash256",
 };
 EXPORT_SYMBOL_GPL(hash_algo_name);
 
@@ -59,5 +60,6 @@ const int hash_digest_size[HASH_ALGO__LAST] = {
 	[HASH_ALGO_SHA3_256]    = SHA3_256_DIGEST_SIZE,
 	[HASH_ALGO_SHA3_384]    = SHA3_384_DIGEST_SIZE,
 	[HASH_ALGO_SHA3_512]    = SHA3_512_DIGEST_SIZE,
+	[HASH_ALGO_ASCON_HASH256] = ASCON_HASH256_DIGEST_SIZE,
 };
 EXPORT_SYMBOL_GPL(hash_digest_size);

-- 
2.52.0

[PATCH v2 3/3] crypto: Crypto API implementation of Ascon-Hash256

[Rusydi H. Makarim]

This commit implements Ascon-Hash256 for Crypto API

Signed-off-by: Rusydi H. Makarim <rusydi.makarim@kriptograf.id>
---
 crypto/Kconfig      |  7 +++++
 crypto/Makefile     |  1 +
 crypto/ascon_hash.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 94 insertions(+)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 2e5b195b1b06..e671b5575535 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1000,6 +1000,13 @@ config CRYPTO_SHA3
 	help
 	  SHA-3 secure hash algorithms (FIPS 202, ISO/IEC 10118-3)
 
+config CRYPTO_ASCON_HASH
+	tristate "Ascon-Hash"
+	select CRYPTO_HASH
+	select CRYPTO_LIB_ASCON_HASH
+	help
+	  Ascon-Hash secure hash algorithms (NIST SP 800-232)
+
 config CRYPTO_SM3_GENERIC
 	tristate "SM3 (ShangMi 3)"
 	select CRYPTO_HASH
diff --git a/crypto/Makefile b/crypto/Makefile
index 16a35649dd91..a697a92d2092 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -82,6 +82,7 @@ obj-$(CONFIG_CRYPTO_SHA3) += sha3.o
 obj-$(CONFIG_CRYPTO_SM3_GENERIC) += sm3_generic.o
 obj-$(CONFIG_CRYPTO_STREEBOG) += streebog_generic.o
 obj-$(CONFIG_CRYPTO_WP512) += wp512.o
+obj-$(CONFIG_CRYPTO_ASCON_HASH) += ascon_hash.o
 CFLAGS_wp512.o := $(call cc-option,-fno-schedule-insns)  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79149
 obj-$(CONFIG_CRYPTO_BLAKE2B) += blake2b.o
 obj-$(CONFIG_CRYPTO_ECB) += ecb.o
diff --git a/crypto/ascon_hash.c b/crypto/ascon_hash.c
new file mode 100644
index 000000000000..2fa5e762fbc1
--- /dev/null
+++ b/crypto/ascon_hash.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Crypto API support for Ascon-Hash256
+ * (https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-232.pdf)
+ *
+ * Copyright (C) Rusydi H. Makarim <rusydi.makarim@kriptograf.id>
+ */
+
+#include <crypto/internal/hash.h>
+#include <crypto/ascon_hash.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#define ASCON_HASH256_CTX(desc) ((struct ascon_hash256_ctx *)shash_desc_ctx(desc))
+
+static int crypto_ascon_hash256_init(struct shash_desc *desc)
+{
+	ascon_hash256_init(ASCON_HASH256_CTX(desc));
+	return 0;
+}
+
+static int crypto_ascon_hash256_update(struct shash_desc *desc, const u8 *data,
+				       unsigned int len)
+{
+	ascon_hash256_update(ASCON_HASH256_CTX(desc), data, len);
+	return 0;
+}
+
+static int crypto_ascon_hash256_final(struct shash_desc *desc, u8 *out)
+{
+	ascon_hash256_final(ASCON_HASH256_CTX(desc), out);
+	return 0;
+}
+
+static int crypto_ascon_hash256_digest(struct shash_desc *desc, const u8 *data,
+				       unsigned int len, u8 *out)
+{
+	ascon_hash256(data, len, out);
+	return 0;
+}
+
+static int crypto_ascon_hash256_export_core(struct shash_desc *desc, void *out)
+{
+	memcpy(out, ASCON_HASH256_CTX(desc), sizeof(struct ascon_hash256_ctx));
+	return 0;
+}
+
+static int crypto_ascon_hash256_import_core(struct shash_desc *desc,
+					    const void *in)
+{
+	memcpy(ASCON_HASH256_CTX(desc), in, sizeof(struct ascon_hash256_ctx));
+	return 0;
+}
+
+static struct shash_alg algs[] = { {
+	.digestsize = ASCON_HASH256_DIGEST_SIZE,
+	.init = crypto_ascon_hash256_init,
+	.update = crypto_ascon_hash256_update,
+	.final = crypto_ascon_hash256_final,
+	.digest = crypto_ascon_hash256_digest,
+	.export_core = crypto_ascon_hash256_export_core,
+	.import_core = crypto_ascon_hash256_import_core,
+	.descsize = sizeof(struct ascon_hash256_ctx),
+	.base.cra_name = "ascon-hash256",
+	.base.cra_driver_name = "ascon-hash256-lib",
+	.base.cra_blocksize = ASCON_HASH256_BLOCK_SIZE,
+	.base.cra_module = THIS_MODULE,
+} };
+
+static int __init crypto_ascon_hash256_mod_init(void)
+{
+	return crypto_register_shashes(algs, ARRAY_SIZE(algs));
+}
+module_init(crypto_ascon_hash256_mod_init);
+
+static void __exit crypto_ascon_hash256_mod_exit(void)
+{
+	crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
+}
+module_exit(crypto_ascon_hash256_mod_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Crypto API support for Ascon-Hash256");
+
+MODULE_ALIAS_CRYPTO("ascon-hash256");
+MODULE_ALIAS_CRYPTO("ascon-hash256-lib");

-- 
2.52.0