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            |  97 ++++++++++++++
 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, 375 insertions(+)

diff --git a/include/crypto/ascon_hash.h b/include/crypto/ascon_hash.h
new file mode 100644
index 000000000000..bb3561a745a9
--- /dev/null
+++ b/include/crypto/ascon_hash.h
@@ -0,0 +1,97 @@
+/* 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
+
+/*
+ * 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,
+};
+
+/*
+ * 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