1 files changed, 18 insertions, 0 deletions
diff --git a/util/sbase/sha256.h b/util/sbase/sha256.h
new file mode 100644
index 00000000..5968b8e1
--- /dev/null
+++ b/util/sbase/sha256.h
@@ -0,0 +1,18 @@
+/* public domain sha256 implementation based on fips180-3 */
+
+struct sha256 {
+	uint64_t len;    /* processed message length */
+	uint32_t h[8];   /* hash state */
+	uint8_t buf[64]; /* message block buffer */
+};
+
+enum { SHA256_DIGEST_LENGTH = 32 };
+
+/* reset state */
+void sha256_init(void *ctx);
+/* process message */
+void sha256_update(void *ctx, const void *m, unsigned long len);
+/* get message digest */
+/* state is ruined after sum, keep a copy if multiple sum is needed */
+/* part of the message might be left in s, zero it if secrecy is needed */
+void sha256_sum(void *ctx, uint8_t md[SHA256_DIGEST_LENGTH]);