1 files changed, 66 insertions, 0 deletions
diff --git a/crypto/slh_dsa/slh_hash.h b/crypto/slh_dsa/slh_hash.h
new file mode 100644
index 000000000000..3033b657ab9e
--- /dev/null
+++ b/crypto/slh_dsa/slh_hash.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2024-2025 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#ifndef OSSL_CRYPTO_SLH_HASH_H
+# define OSSL_CRYPTO_SLH_HASH_H
+# pragma once
+
+# include <openssl/e_os2.h>
+# include "slh_adrs.h"
+# include "internal/packet.h"
+
+# define SLH_HASH_FUNC_DECLARE(ctx, hashf)            \
+    const SLH_HASH_FUNC *hashf = ctx->hash_func       \
+
+# define SLH_HASH_FN_DECLARE(hashf, t) OSSL_SLH_HASHFUNC_##t * t = hashf->t
+
+/*
+ * @params out is |m| bytes which ranges from (30..49) bytes
+ */
+typedef int (OSSL_SLH_HASHFUNC_H_MSG)(SLH_DSA_HASH_CTX *ctx, const uint8_t *r,
+                                      const uint8_t *pk_seed, const uint8_t *pk_root,
+                                      const uint8_t *msg, size_t msg_len,
+                                      uint8_t *out, size_t out_len);
+
+typedef int (OSSL_SLH_HASHFUNC_PRF)(SLH_DSA_HASH_CTX *ctx, const uint8_t *pk_seed,
+                                    const uint8_t *sk_seed, const uint8_t *adrs,
+                                    uint8_t *out, size_t out_len);
+
+typedef int (OSSL_SLH_HASHFUNC_PRF_MSG)(SLH_DSA_HASH_CTX *ctx, const uint8_t *sk_prf,
+                                        const uint8_t *opt_rand,
+                                        const uint8_t *msg, size_t msg_len,
+                                        WPACKET *pkt);
+
+typedef int (OSSL_SLH_HASHFUNC_F)(SLH_DSA_HASH_CTX *ctx, const uint8_t *pk_seed,
+                                  const uint8_t *adrs,
+                                  const uint8_t *m1, size_t m1_len,
+                                  uint8_t *out, size_t out_len);
+
+typedef int (OSSL_SLH_HASHFUNC_H)(SLH_DSA_HASH_CTX *ctx, const uint8_t *pk_seed,
+                                  const uint8_t *adrs,
+                                  const uint8_t *m1, const uint8_t *m2,
+                                  uint8_t *out, size_t out_len);
+
+typedef int (OSSL_SLH_HASHFUNC_T)(SLH_DSA_HASH_CTX *ctx, const uint8_t *pk_seed,
+                                  const uint8_t *adrs,
+                                  const uint8_t *m1, size_t m1_len,
+                                  uint8_t *out, size_t out_len);
+
+typedef struct slh_hash_func_st {
+    OSSL_SLH_HASHFUNC_H_MSG *H_MSG;
+    OSSL_SLH_HASHFUNC_PRF *PRF;
+    OSSL_SLH_HASHFUNC_PRF_MSG *PRF_MSG;
+    OSSL_SLH_HASHFUNC_F *F;
+    OSSL_SLH_HASHFUNC_H *H;
+    OSSL_SLH_HASHFUNC_T *T;
+} SLH_HASH_FUNC;
+
+const SLH_HASH_FUNC *ossl_slh_get_hash_fn(int is_shake);
+
+#endif