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diff --git a/lib/libc/include/crypto/sha256.h b/lib/libc/include/crypto/sha256.h
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+++ b/lib/libc/include/crypto/sha256.h
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+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CRYPTO_SHA256_H
+#define _CRYPTO_SHA256_H 1
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define SHA256_HEX_SIZE (64 + 1)
+#define SHA256_BYTES_SIZE 32
+
+/*
+ * Compute the SHA-256 checksum of a memory region given a pointer and
+ * the size of that memory region.
+ * The output is a hexadecimal string of 65 characters.
+ * The last character will be the null-character.
+ */
+void sha256_hex(const void *src, size_t n_bytes, char *dst_hex65);
+
+void sha256_bytes(const void *src, size_t n_bytes, void *dst_bytes32);
+
+typedef struct sha256 {
+    uint32_t state[8];
+    uint8_t buffer[64];
+    uint64_t n_bits;
+    uint8_t buffer_counter;
+} sha256;
+
+/* Functions to compute streaming SHA-256 checksums. */
+void sha256_init(struct sha256 *sha);
+void sha256_append(struct sha256 *sha, const void *data, size_t n_bytes);
+void sha256_finalize_hex(struct sha256 *sha, char *dst_hex65);
+void sha256_finalize_bytes(struct sha256 *sha, void *dst_bytes32);
+
+#endif  /* !_CRYPTO_SHA256_H */