add hkdf impl

src/headers/tomcrypt.h

@@ -74,6 +74,7 @@ enum {
 #include <tomcrypt_misc.h>
 #include <tomcrypt_argchk.h>
 #include <tomcrypt_pkcs.h>
+#include <tomcrypt_hkdf.h>
 
 #ifdef __cplusplus
    }

src/headers/tomcrypt_custom.h

@@ -360,6 +360,13 @@
 
 #endif /* LTC_NO_PKCS */
 
+/* LTC_HKDF Key Derivation/Expansion stuff */
+#ifndef LTC_NO_HKDF
+
+#define LTC_HKDF
+
+#endif /* LTC_NO_HKDF */
+
 /* cleanup */
 
 #ifdef LTC_MECC

src/headers/tomcrypt_hkdf.h

@@ -0,0 +1,26 @@
+/* LTC_HKDF Header Info */
+
+/* ===> LTC_HKDF -- RFC5869 HMAC-based Key Derivation Function <=== */
+#ifdef LTC_HKDF
+
+int hkdf_extract(int hash_idx,
+                 const unsigned char *salt, unsigned long saltlen,
+                 const unsigned char *in,   unsigned long inlen,
+                       unsigned char *out,  unsigned long *outlen);
+
+int hkdf_expand(int hash_idx,
+                const unsigned char *info, unsigned long infolen,
+                const unsigned char *in,   unsigned long inlen,
+                      unsigned char *out,  unsigned long outlen);
+
+int hkdf(int hash_idx,
+         const unsigned char *salt, unsigned long saltlen,
+         const unsigned char *info, unsigned long infolen,
+         const unsigned char *in,   unsigned long inlen,
+               unsigned char *out,  unsigned long outlen);
+
+#endif  /* LTC_HKDF */
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */