crypto/hkdf_sha256: new module.

[ccan] / ccan / crypto / hkdf_sha256 / hkdf_sha256.h

diff --git a/ccan/crypto/hkdf_sha256/hkdf_sha256.h b/ccan/crypto/hkdf_sha256/hkdf_sha256.h
new file mode 100644 (file)
index 0000000..cb29502
--- /dev/null
+++ b/ccan/crypto/hkdf_sha256/hkdf_sha256.h
@@ -0,0 +1,22 @@
+#ifndef CCAN_CRYPTO_HKDF_SHA256_H
+#define CCAN_CRYPTO_HKDF_SHA256_H
+/* BSD-MIT - see LICENSE file for details */
+#include "config.h"
+#include <stdlib.h>
+
+/**
+ * hkdf_sha256 - generate a derived key
+ * @okm: where to output the key
+ * @okm_size: the number of bytes pointed to by @okm (must be less than 255*32)
+ * @s: salt
+ * @ssize: the number of bytes pointed to by @s
+ * @k: pointer to input key
+ * @ksize: the number of bytes pointed to by @k
+ * @info: pointer to info
+ * @isize: the number of bytes pointed to by @info
+ */
+void hkdf_sha256(unsigned char *okm, size_t okm_size,
+                const void *s, size_t ssize,
+                const void *k, size_t ksize,
+                const void *info, size_t isize);
+#endif /* CCAN_CRYPTO_HKDF_SHA256_H */