crypto/hmac_sha256: new module.

[ccan] / ccan / crypto / hmac_sha256 / _info

diff --git a/ccan/crypto/hmac_sha256/_info b/ccan/crypto/hmac_sha256/_info
new file mode 100644 (file)
index 0000000..3861238
--- /dev/null
+++ b/ccan/crypto/hmac_sha256/_info
@@ -0,0 +1,52 @@
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+
+/**
+ * crypto/hmac_sha256 - RFC2104 HMAC using SHA256.
+ *
+ * This code implements RFC2104, which is a fairly standard HMAC.
+ *
+ * License: BSD-MIT
+ * Maintainer: Rusty Russell <rusty@rustcorp.com.au>
+ *
+ * Example:
+ *     #include <ccan/crypto/hmac_sha256/hmac_sha256.h>
+ *     #include <err.h>
+ *     #include <stdio.h>
+ *     #include <string.h>
+ *
+ *     // Simple demonstration: idential strings will have the same hash, but
+ *     // two different strings will not.
+ *     int main(int argc, char *argv[])
+ *     {
+ *             struct hmac_sha256 hash1, hash2;
+ *
+ *             if (argc != 3)
+ *                     errx(1, "Usage: %s <string1> <string2>", argv[0]);
+ *
+ *             hmac_sha256(&hash1, "key", 3, argv[1], strlen(argv[1]));
+ *             hmac_sha256(&hash2, "key", 3, argv[2], strlen(argv[2]));
+ *             printf("Hash is %s\n", memcmp(&hash1, &hash2, sizeof(hash1))
+ *                     ? "different" : "same");
+ *             return 0;
+ *     }
+ */
+int main(int argc, char *argv[])
+{
+       /* Expect exactly one argument */
+       if (argc != 2)
+               return 1;
+
+       if (strcmp(argv[1], "depends") == 0) {
+               printf("ccan/crypto/sha256\n");
+               return 0;
+       }
+
+       if (strcmp(argv[1], "testdepends") == 0) {
+               printf("ccan/str/hex\n");
+               return 0;
+       }
+
+       return 1;
+}