diff --git a/.clang-format b/.clang-format
deleted file mode 100644
index 53dfb72..0000000
--- a/.clang-format
+++ /dev/null
@@ -1,90 +0,0 @@
----
-Language:        Cpp
-# BasedOnStyle:  GNU
-AccessModifierOffset: -2
-AlignAfterOpenBracket: Align
-AlignConsecutiveAssignments: false
-AlignConsecutiveDeclarations: false
-AlignEscapedNewlinesLeft: true
-AlignOperands:   true
-AlignTrailingComments: true
-AllowAllParametersOfDeclarationOnNextLine: true
-AllowShortBlocksOnASingleLine: false
-AllowShortCaseLabelsOnASingleLine: false
-AllowShortFunctionsOnASingleLine: All
-AllowShortIfStatementsOnASingleLine: false
-AllowShortLoopsOnASingleLine: false
-AlwaysBreakAfterDefinitionReturnType: None
-AlwaysBreakAfterReturnType: None
-AlwaysBreakBeforeMultilineStrings: false
-AlwaysBreakTemplateDeclarations: false
-BinPackArguments: true
-BinPackParameters: false
-BraceWrapping:   
-  AfterClass:      true
-  AfterControlStatement: true
-  AfterEnum:       true
-  AfterFunction:   true
-  AfterNamespace:  true
-  AfterObjCDeclaration: true
-  AfterStruct:     true
-  AfterUnion:      true
-  BeforeCatch:     true
-  BeforeElse:      true
-  IndentBraces:    false
-BreakBeforeBinaryOperators: All
-BreakBeforeBraces: Custom
-BreakBeforeTernaryOperators: true
-BreakConstructorInitializersBeforeComma: false
-ColumnLimit:     132
-CommentPragmas:  '^ IWYU pragma:'
-ConstructorInitializerAllOnOneLineOrOnePerLine: false
-ConstructorInitializerIndentWidth: 4
-ContinuationIndentWidth: 4
-Cpp11BracedListStyle: false
-DerivePointerAlignment: false
-DisableFormat:   false
-ExperimentalAutoDetectBinPacking: false
-ForEachMacros:   [ foreach, Q_FOREACH, BOOST_FOREACH ]
-IncludeCategories: 
-  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
-    Priority:        2
-  - Regex:           '^(<|"(gtest|isl|json)/)'
-    Priority:        3
-  - Regex:           '.*'
-    Priority:        1
-IndentCaseLabels: false
-IndentWidth:     4
-IndentWrappedFunctionNames: false
-KeepEmptyLinesAtTheStartOfBlocks: true
-MacroBlockBegin: ''
-MacroBlockEnd:   ''
-MaxEmptyLinesToKeep: 1
-NamespaceIndentation: None
-ObjCBlockIndentWidth: 2
-ObjCSpaceAfterProperty: false
-ObjCSpaceBeforeProtocolList: true
-PenaltyBreakBeforeFirstCallParameter: 19
-PenaltyBreakComment: 300
-PenaltyBreakFirstLessLess: 120
-PenaltyBreakString: 1000
-PenaltyExcessCharacter: 1000000
-PenaltyReturnTypeOnItsOwnLine: 60
-PointerAlignment: Right
-ReflowComments:  true
-SortIncludes:    false
-SpaceAfterCStyleCast: false
-SpaceBeforeAssignmentOperators: true
-SpaceBeforeParens: ControlStatements
-SpaceInEmptyParentheses: false
-SpacesBeforeTrailingComments: 1
-SpacesInAngles:  false
-SpacesInContainerLiterals: true
-SpacesInCStyleCastParentheses: false
-SpacesInParentheses: false
-SpacesInSquareBrackets: false
-Standard:        Cpp03
-TabWidth:        8
-UseTab:          Never
-...
-
diff --git a/.gitignore b/.gitignore
deleted file mode 100644
index 25a2a16..0000000
--- a/.gitignore
+++ /dev/null
@@ -1,57 +0,0 @@
-# Build files
-autom4te.cache/
-config.log
-config.status
-Makefile
-libtool
-*/.deps
-*/.libs
-include/cjose/version.h
-doc/Doxyfile
-**/*.pkg-tag
-**/*.img-tag
-
-# Object files
-*.o
-*.lo
-
-# Libraries
-*.lib
-*.a
-
-# Shared objects (inc. Windows DLLs)
-*.dll
-*.so
-*.so.*
-*.dylib
-*.la
-
-# Executables
-*.exe
-*.out
-*.app
-
-# Documentation and Packaging
-doc/*.tag
-doc/html
-doc/latex
-cjose.pc
-
-# Tests and logging
-test/check_cjose
-test/*.log
-test/*.trs
-
-# local edit and ide files
-.swp
-.*.swp
-.tags
-*.sublime-project
-*.sublime-workspace
-*-e
-/.project
-/.cproject
-
-# Deliverables
-cjose-*.tar.gz
-dist/
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
deleted file mode 100644
index bbcf9cc..0000000
--- a/CONTRIBUTING.md
+++ /dev/null
@@ -1,8 +0,0 @@
-# Contributing #
-
-## Before Submitting PR ##
-
-* Run `make clang-format`
-* Run `make test`
-
-*NOTE* You must use clang-format 3.9.0. You can download binaries from [here](https://bintray.com/apache/trafficserver/clang-format-tools).
diff --git a/include/cjose/jwk.h b/include/cjose/jwk.h
index 0852980..c255efa 100644
--- a/include/cjose/jwk.h
+++ b/include/cjose/jwk.h
@@ -26,7 +26,8 @@ extern "C" {
 #endif
 
 /** Enumeration of supported JSON Web Key (JWK) types */
-typedef enum {
+typedef enum
+{
     /** RSA Public (or Private) Key */
     CJOSE_JWK_KTY_RSA = 1,
     /** Elliptic Curve Public (or Private) Key */
@@ -212,7 +213,8 @@ cjose_jwk_t *cjose_jwk_create_RSA_random(size_t keysize, const uint8_t *e, size_
 cjose_jwk_t *cjose_jwk_create_RSA_spec(const cjose_jwk_rsa_keyspec *spec, cjose_err *err);
 
 /** Enumeration of supported Elliptic-Curve types */
-typedef enum {
+typedef enum
+{
     /** NIST P-256 Prime Curve (secp256r1) */
     CJOSE_JWK_EC_P_256 = NID_X9_62_prime256v1,
     /** NIST P-384 Prime Curve (secp384r1) */
@@ -357,17 +359,21 @@ cjose_jwk_t *cjose_jwk_import_json(cjose_header_t *json, cjose_err *err);
  *
  * \param jwk_self [in] The caller's own EC key pair.
  * \param jwk_peer [in] The peer's EC public key.
+ * \param salt [in] An optional salt to apply to the HMAC calculation. Unless FIPS mode is required this can be empty.
+ * \param salt_len [in] The length of the optional salt.
  * \param err [out] An optional error object which can be used to get additional
  *        information in the event of an error.
  * \returns A new JWK representing the ephemeral key, or NULL in the event of
  *        and error.
  */
-cjose_jwk_t *cjose_jwk_derive_ecdh_ephemeral_key(const cjose_jwk_t *jwk_self, const cjose_jwk_t *jwk_peer, cjose_err *err);
+cjose_jwk_t *cjose_jwk_derive_ecdh_ephemeral_key(
+    const cjose_jwk_t *jwk_self, const cjose_jwk_t *jwk_peer, const uint8_t *salt, size_t salt_len, cjose_err *err);
 
 /**
  Deprecated.  Alias for cjose_jwk_derive_ecdh_ephemeral_key.
 */
-cjose_jwk_t *cjose_jwk_derive_ecdh_secret(const cjose_jwk_t *jwk_self, const cjose_jwk_t *jwk_peer, cjose_err *err);
+cjose_jwk_t *cjose_jwk_derive_ecdh_secret(
+    const cjose_jwk_t *jwk_self, const cjose_jwk_t *jwk_peer, const uint8_t *salt, size_t salt_len, cjose_err *err);
 
 #ifdef __cplusplus
 }
diff --git a/include/cjose/version.h b/include/cjose/version.h
new file mode 100644
index 0000000..62dbdab
--- /dev/null
+++ b/include/cjose/version.h
@@ -0,0 +1,38 @@
+/*
+ * Copyrights
+ *
+ * Portions created or assigned to Cisco Systems, Inc. are
+ * Copyright (c) 2014-2016 Cisco Systems, Inc.  All Rights Reserved.
+ */
+/**
+ * \file
+ * \brief
+ * Function to retrieve the version of CJOSE
+ */
+
+#ifndef _CJOSE_VERSION_H_
+#define _CJOSE_VERSION_H_
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/**
+ * The declaration version of CJOSE. This identifies
+ * the version the header files were compiled for.
+ */
+#define CJOSE_VERSION "0.6.1"
+
+/**
+ * Retrieves the implementation version of CJOSE.
+ *
+ * \returns the implementation version number.
+ */
+const char *cjose_version();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // _CJOSE_VERSION_H_
diff --git a/lib b/lib
deleted file mode 120000
index df64832..0000000
--- a/lib
+++ /dev/null
@@ -1 +0,0 @@
-src/.libs/
\ No newline at end of file
diff --git a/platform/Makefile.am b/platform/Makefile.am
new file mode 100644
index 0000000..8835434
--- /dev/null
+++ b/platform/Makefile.am
@@ -0,0 +1,6 @@
+SUBDIRS = centos debian
+
+package-local :
+	mkdir -p $(top_builddir)/dist && \
+	rm -rf $(top_builddir)/dist/cjose-$(PACKAGE_VERSION).tar.gz && \
+	cp $(top_builddir)/cjose-$(PACKAGE_VERSION).tar.gz $(top_builddir)/dist
diff --git a/platform/Makefile.in b/platform/Makefile.in
new file mode 100644
index 0000000..17dba3d
--- /dev/null
+++ b/platform/Makefile.in
@@ -0,0 +1,658 @@
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+# @configure_input@
+
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+
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+
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diff --git a/platform/centos/Makefile.am b/platform/centos/Makefile.am
new file mode 100644
index 0000000..48c9d88
--- /dev/null
+++ b/platform/centos/Makefile.am
@@ -0,0 +1,23 @@
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+
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+	docker build --force-rm --tag cjose_build:$(shell basename $< .dockerfile) --file $< . && \
+	echo "$(shell date -ju)" > $@
+
+%.pkg-tag : %.img-tag $(top_builddir)/cjose-$(PACKAGE_VERSION).tar.gz
+	docker run --rm --env PACKAGE_VERSION=$(PACKAGE_VERSION) \
+		--volume $(abs_top_builddir)/dist:/opt/dist \
+		--volume $(abs_builddir):/opt/src \
+		cjose_build:$(shell basename $< .img-tag) && \
+        echo "$(shell date -ju)" > $@
+
+package-local : $(PLATFORM_PKGS)
+	@echo built $(PLATFORMS)
+
+clean-local :
+	rm -rf *.img-tag *.pkg-tag
+
+.PRECIOUS: $(PLATFORM_IMGS)
diff --git a/platform/centos/Makefile.in b/platform/centos/Makefile.in
new file mode 100644
index 0000000..245c8ef
--- /dev/null
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+
+%.pkg-tag : %.img-tag $(top_builddir)/cjose-$(PACKAGE_VERSION).tar.gz
+	docker run --rm --env PACKAGE_VERSION=$(PACKAGE_VERSION) \
+		--volume $(abs_top_builddir)/dist:/opt/dist \
+		--volume $(abs_builddir):/opt/src \
+		cjose_build:$(shell basename $< .img-tag) && \
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new file mode 100644
index 0000000..48c9d88
--- /dev/null
+++ b/platform/debian/Makefile.am
@@ -0,0 +1,23 @@
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+PLATFORM_PKGS := $(patsubst %,%.pkg-tag,$(PLATFORMS))
+
+%.img-tag : %.dockerfile
+	docker build --force-rm --tag cjose_build:$(shell basename $< .dockerfile) --file $< . && \
+	echo "$(shell date -ju)" > $@
+
+%.pkg-tag : %.img-tag $(top_builddir)/cjose-$(PACKAGE_VERSION).tar.gz
+	docker run --rm --env PACKAGE_VERSION=$(PACKAGE_VERSION) \
+		--volume $(abs_top_builddir)/dist:/opt/dist \
+		--volume $(abs_builddir):/opt/src \
+		cjose_build:$(shell basename $< .img-tag) && \
+        echo "$(shell date -ju)" > $@
+
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diff --git a/platform/debian/Makefile.in b/platform/debian/Makefile.in
new file mode 100644
index 0000000..d948fbc
--- /dev/null
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+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+package-local: 
+tags TAGS:
+
+ctags CTAGS:
+
+cscope cscopelist:
+
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-local mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+package: package-am
+
+package-am: package-local
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic clean-libtool \
+	clean-local cscopelist-am ctags-am distclean distclean-generic \
+	distclean-libtool distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-generic mostlyclean-libtool package-am \
+	package-local pdf pdf-am ps ps-am tags-am uninstall \
+	uninstall-am
+
+.PRECIOUS: Makefile
+
+
+%.img-tag : %.dockerfile
+	docker build --force-rm --tag cjose_build:$(shell basename $< .dockerfile) --file $< . && \
+	echo "$(shell date -ju)" > $@
+
+%.pkg-tag : %.img-tag $(top_builddir)/cjose-$(PACKAGE_VERSION).tar.gz
+	docker run --rm --env PACKAGE_VERSION=$(PACKAGE_VERSION) \
+		--volume $(abs_top_builddir)/dist:/opt/dist \
+		--volume $(abs_builddir):/opt/src \
+		cjose_build:$(shell basename $< .img-tag) && \
+        echo "$(shell date -ju)" > $@
+
+package-local : $(PLATFORM_PKGS)
+	@echo built $(PLATFORMS)
+
+clean-local :
+	rm -rf *.img-tag *.pkg-tag
+
+.PRECIOUS: $(PLATFORM_IMGS)
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/concatkdf.c b/src/concatkdf.c
index 65c4976..59b845a 100644
--- a/src/concatkdf.c
+++ b/src/concatkdf.c
@@ -7,24 +7,31 @@
 
 #include "include/concatkdf_int.h"
 
+
+#ifdef _WIN32
+#include <Winsock2.h>
+#include <malloc.h>
+#else
 #include <arpa/inet.h>
+#include <alloca.h>
+#endif
 #include <openssl/evp.h>
 #include <string.h>
 #include <cjose/base64.h>
 #include <cjose/util.h>
 
+#ifdef _WIN32
+#define STACK_ALLOC _alloca
+#else
+#define STACK_ALLOC alloca
+#endif
+
 ////////////////////////////////////////////////////////////////////////////////
 static uint8_t *_apply_uint32(const uint32_t value, uint8_t *buffer)
 {
-    const uint32_t formatted = htonl(value);
-    const uint8_t data[4] = {
-        (formatted >> 0) & 0xff,
-        (formatted >> 8) & 0xff,
-        (formatted >> 16) & 0xff,
-        (formatted >> 24) & 0xff
-    };
-    memcpy(buffer, data, 4);
+    const uint32_t big_endian_int32 = htonl(value);
 
+    memcpy(buffer, &big_endian_int32, 4);
     return buffer + 4;
 }
 
@@ -139,7 +146,7 @@ uint8_t *cjose_concatkdf_derive(const size_t keylen,
         uint8_t counter[4];
         _apply_uint32(idx, counter);
 
-        uint8_t hash[hashlen];
+        uint8_t* hash = STACK_ALLOC(hashlen * sizeof(uint8_t));
         if (1 != EVP_DigestInit_ex(ctx, dgst, NULL) ||
             1 != EVP_DigestUpdate(ctx, counter, sizeof(counter)) ||
             1 != EVP_DigestUpdate(ctx, ikm, ikmLen) ||
diff --git a/src/jwk.c b/src/jwk.c
index 26d0e09..860f0e7 100644
--- a/src/jwk.c
+++ b/src/jwk.c
@@ -1695,12 +1695,14 @@ _cjose_jwk_evp_key_from_ec_key_fail:
     return false;
 }
 
-cjose_jwk_t *cjose_jwk_derive_ecdh_secret(const cjose_jwk_t *jwk_self, const cjose_jwk_t *jwk_peer, cjose_err *err)
+cjose_jwk_t *cjose_jwk_derive_ecdh_secret(
+    const cjose_jwk_t *jwk_self, const cjose_jwk_t *jwk_peer, const uint8_t *salt, size_t salt_len, cjose_err *err)
 {
-    return cjose_jwk_derive_ecdh_ephemeral_key(jwk_self, jwk_peer, err);
+    return cjose_jwk_derive_ecdh_ephemeral_key(jwk_self, jwk_peer, salt, salt_len, err);
 }
 
-cjose_jwk_t *cjose_jwk_derive_ecdh_ephemeral_key(const cjose_jwk_t *jwk_self, const cjose_jwk_t *jwk_peer, cjose_err *err)
+cjose_jwk_t *cjose_jwk_derive_ecdh_ephemeral_key(
+    const cjose_jwk_t *jwk_self, const cjose_jwk_t *jwk_peer, const uint8_t *salt, size_t salt_len, cjose_err *err)
 {
     uint8_t *secret = NULL;
     size_t secret_len = 0;
@@ -1713,11 +1715,10 @@ cjose_jwk_t *cjose_jwk_derive_ecdh_ephemeral_key(const cjose_jwk_t *jwk_self, co
         goto _cjose_jwk_derive_shared_secret_fail;
     }
 
-    // HKDF of the DH shared secret (SHA256, no salt, no info, 256 bit expand)
+    // HKDF of the DH shared secret (SHA256, no info, 256 bit expand)
     ephemeral_key_len = 32;
     ephemeral_key = (uint8_t *)cjose_get_alloc()(ephemeral_key_len);
-    if (!cjose_jwk_hkdf(EVP_sha256(), (uint8_t *)"", 0, (uint8_t *)"", 0, secret, secret_len, ephemeral_key, ephemeral_key_len,
-                        err))
+    if (!cjose_jwk_hkdf(EVP_sha256(), salt, salt_len, (uint8_t *)"", 0, secret, secret_len, ephemeral_key, ephemeral_key_len, err))
     {
         goto _cjose_jwk_derive_shared_secret_fail;
     }
@@ -1747,11 +1748,8 @@ _cjose_jwk_derive_shared_secret_fail:
     return NULL;
 }
 
-bool cjose_jwk_derive_ecdh_bits(const cjose_jwk_t *jwk_self,
-                                const cjose_jwk_t *jwk_peer,
-                                uint8_t **output,
-                                size_t *output_len,
-                                cjose_err *err)
+bool cjose_jwk_derive_ecdh_bits(
+    const cjose_jwk_t *jwk_self, const cjose_jwk_t *jwk_peer, uint8_t **output, size_t *output_len, cjose_err *err)
 {
     EVP_PKEY_CTX *ctx = NULL;
     EVP_PKEY *pkey_self = NULL;
@@ -1865,11 +1863,19 @@ bool cjose_jwk_hkdf(const EVP_MD *md,
     // HKDF-Extract, HMAC-SHA256(salt, IKM) -> PRK
     unsigned int prk_len;
     unsigned char prk[EVP_MAX_MD_SIZE];
-    HMAC(md, salt, salt_len, ikm, ikm_len, prk, &prk_len);
+    if (NULL == HMAC(md, salt, salt_len, ikm, ikm_len, prk, &prk_len))
+    {
+        CJOSE_ERROR(err, CJOSE_ERR_CRYPTO);
+        return false;
+    }
 
     // HKDF-Expand, HMAC-SHA256(PRK,0x01) -> OKM
     const unsigned char t[] = { 0x01 };
-    HMAC(md, prk, prk_len, t, sizeof(t), okm, NULL);
+    if (NULL == HMAC(md, prk, prk_len, t, sizeof(t), okm, NULL))
+    {
+        CJOSE_ERROR(err, CJOSE_ERR_CRYPTO);
+        return false;
+    }
 
     return true;
 }
diff --git a/src/jws.c b/src/jws.c
index e38cbec..4e03554 100644
--- a/src/jws.c
+++ b/src/jws.c
@@ -171,6 +171,12 @@ static bool _cjose_jws_build_dig_sha(cjose_jws_t *jws, const cjose_jwk_t *jwk, c
         goto _cjose_jws_build_dig_sha_cleanup;
     }
 
+    if (NULL != jws->dig)
+    {
+    	cjose_get_dealloc()(jws->dig);
+    	jws->dig = NULL;
+    }
+
     // allocate buffer for digest
     jws->dig_len = EVP_MD_size(digest_alg);
     jws->dig = (uint8_t *)cjose_get_alloc()(jws->dig_len);
diff --git a/test/check_concatkdf.c b/test/check_concatkdf.c
index e4325fc..41d0f1c 100644
--- a/test/check_concatkdf.c
+++ b/test/check_concatkdf.c
@@ -60,14 +60,9 @@ _create_otherinfo_header_finish:
 
 static bool _cmp_uint32(uint8_t **actual, uint32_t expected)
 {
-    uint32_t value = htonl(expected);
-    uint8_t expectedData[] = {
-        (value >> 0) & 0xff,
-        (value >> 8) & 0xff,
-        (value >> 16) & 0xff,
-        (value >> 24) & 0xff
-    };
-    bool result = (0 == memcmp(*actual, expectedData, 4));
+    uint32_t big_endian_int32 = htonl(expected);
+
+    bool result = (0 == memcmp(*actual, &big_endian_int32, 4));
     (*actual) += 4;
     return result;
 }