1 files changed, 90 insertions, 0 deletions
diff --git a/libhmac/hmac.h b/libhmac/hmac.h
new file mode 100644
index 0000000..6696efb
--- /dev/null
+++ b/libhmac/hmac.h
@@ -0,0 +1,90 @@
+#ifndef	hmac_h
+#define	hmac_h
+
+#include	<string.h>
+
+/*
+** Copyright 1998 - 2005 Double Precision, Inc.
+** See COPYING for distribution information.
+*/
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+
+struct hmac_hashinfo {	/* HMAC hash function descriptor */
+
+	const char *hh_name;	/* Name of this hash function (md5, sha1...) */
+
+	size_t hh_B;	/* Length of compression blocks */
+	size_t hh_L;	/* Length of hash outputs */
+
+	size_t hh_S;	/* Length of 'context structure' */
+
+	/* Hash functions */
+
+	void (*hh_init)(void *);	/* Initialize context structure */
+	void (*hh_hash)(void *, const void *, unsigned);
+					/* Feed the hash function */
+	void (*hh_endhash)(void *, unsigned long); /* Calculate final hash */
+
+	void (*hh_getdigest)(void *, unsigned char *); /* Get the hash value */
+	void (*hh_setdigest)(void *, const unsigned char *);
+						/* Set the hash value */
+
+	/* Some helper functions */
+
+	/* Allocate context on stack, instead of mallocing it.  Calls the
+	** provided function pointer, with context as first arg.  The second
+	** arg will be passed as provided.
+	*/
+
+	void (*hh_allocacontext)(void (*)(void *, void *), void *);
+
+	/* Like allocacontext, but alloc buffer for hash value, hh_L */
+
+	void (*hh_allocaval)(void (*)(unsigned char *, void *), void *);
+
+	} ;
+
+/* Known hash functions */
+
+extern struct hmac_hashinfo hmac_md5, hmac_sha1, hmac_sha256;
+
+/*
+** List of installed hash functions, dynamically generated at configuration
+** time.
+*/
+
+extern struct hmac_hashinfo *hmac_list[];
+
+/*
+   To calculate an HMAC, allocate three buffers - outer, inner, and hash.
+   Call hmac_hashkey, then hmac_hashtext.
+
+   After hmac_haskey returns, the contents of inner and outer can be
+   saved, as they contain a complete intermediate state of the hash
+   calculation.
+*/
+
+void hmac_hashkey(
+	const struct hmac_hashinfo *,
+	const char *,	/* Key */
+	size_t,	/* Key length */
+	unsigned char *,	/* Output - outer buffer, prehashed */
+	unsigned char *);	/* Output - inner buffer, prehashed */
+
+void hmac_hashtext (
+	const struct hmac_hashinfo *,
+	const char *,	/* Text */
+	size_t,	/* Text length */
+	const unsigned char *,	/* outer buffer, prehashed */
+	const unsigned char *,	/* inner buffer, prehashed */
+	unsigned char *);	/* Output - the hash */
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif