xtea: new module.

[ccan] / ccan / crypto / xtea / xtea.h

diff --git a/ccan/crypto/xtea/xtea.h b/ccan/crypto/xtea/xtea.h
new file mode 100644 (file)
index 0000000..a3e971a
--- /dev/null
+++ b/ccan/crypto/xtea/xtea.h
@@ -0,0 +1,45 @@
+/* CC0 license (public domain) - see LICENSE file for details */
+#ifndef CCAN_CRYPTO_XTEA_H
+#define CCAN_CRYPTO_XTEA_H
+/* Public domain - see LICENSE file for details */
+#include "config.h"
+#include <stdint.h>
+
+/**
+ * struct xtea_secret - secret to use for xtea encryption
+ * @u.u8: an unsigned char array.
+ * @u.u32: a 32-bit integer array.
+ * @u.u64: a 64-bit integer array.
+ *
+ * Other fields may be added to the union in future.
+ */
+struct xtea_secret {
+       union {
+               /* Array of chars */
+               unsigned char u8[16];
+               /* Array of uint32_t */
+               uint32_t u32[4];
+               /* Array of uint64_t */
+               uint64_t u64[2];
+       } u;
+};
+
+/**
+ * xtea_encipher - encrypt a 64-bit value.
+ * @secret: the xtea secret
+ * @v: the 64 bit value
+ *
+ * Returns the 64-bit encrypted value: use xtea_decipher to decrypt.
+ */
+uint64_t xtea_encipher(const struct xtea_secret *secret, uint64_t v);
+
+/**
+ * xtea_decipher - decrypt a 64-bit value.
+ * @secret: the xtea secret
+ * @e: the 64 bit encrypted value
+ *
+ * Returns the 64-bit decryptted value.
+ */
+uint64_t xtea_decipher(const struct xtea_secret *secret, uint64_t e);
+
+#endif /* CCAN_CRYPTO_SIPHASH24_H */