Updates to fix ruby 2.2. Major version upgrade as this breaks compatibility with older versions of ruby.

digest-sha3.gemspec

@@ -9,6 +9,7 @@ Gem::Specification.new do |s|
   s.description = "The SHA-3 (Keccak) hash."
   s.authors = ["Hongli Lai (Phusion)", "Keccak authors"]
   s.extensions << "ext/digest/extconf.rb"
+  s.require_ruby_version = "~> 2.2"
 
   s.files = Dir[
     "README.md",

ext/digest/sha3.c

@@ -9,19 +9,69 @@
 #define MAX_DIGEST_SIZE 64
 #define DEFAULT_DIGEST_LEN 512
 
-static void sha3_init_func(hashState *ctx);
+static int sha3_init_func(hashState *ctx);
 static void sha3_update_func(hashState *ctx, unsigned char *str, size_t len);
+static int sha3_finish_func(hashState *ctx, unsigned char *digest);
 
+/*
+  Metadata definition for the SHA3 algorithm.
+  Defines the Version, sizes for block and digest as well as
+  the entry points for the algorithms
+*/
 static rb_digest_metadata_t sha3 = {
 	RUBY_DIGEST_API_VERSION,
 	DEFAULT_DIGEST_LEN,
-	KeccakPermutationSize - (2 * DEFAULT_DIGEST_LEN),
-	sizeof(hashState),
+	KeccakPermutationSize - (2 * DEFAULT_DIGEST_LEN), //size of blocks
+	sizeof(hashState), //size of context for the object we'll be passed in below functions.
 	(rb_digest_hash_init_func_t)sha3_init_func,
 	(rb_digest_hash_update_func_t)sha3_update_func,
-	NULL,
+	(rb_digest_hash_finish_func_t)sha3_finish_func,
 };
 
+/* Initialization function for the algorithm,
+   gets called during allocation of the digest object.
+   we override initialize to do custom hash size, so we don't care too much here.
+*/
+static int
+sha3_init_func(hashState *ctx) {
+  // Just return a 1 ' successful' we override the init function
+  // so this is not necessary
+  // the base class alloc calls this to initialize the algorithm
+  return 1;
+}
+
+/* Update function, take the current context and add str to it */
+static void
+sha3_update_func(hashState *ctx, unsigned char *str, size_t len) {
+	Update(ctx, str, len * 8);
+}
+
+/* Finish the hash calculation and return the finished string */
+static int
+sha3_finish_func(hashState *ctx, unsigned char *digest) {
+	Final(ctx, digest);
+	return 1;
+}
+
+/* Ruby method.  Digest::SHA3#finish()
+ * No Arguments
+ * @returns [String] Encoded Digest String
+ */
+static VALUE
+rb_sha3_finish(VALUE self) {
+  hashState *ctx;
+  VALUE digest;
+
+  ctx = (hashState *)RTYPEDDATA_DATA(self);
+  digest = rb_str_new(0, ctx->capacity / 2 / 8);
+  sha3_finish_func(ctx, (unsigned char *)RSTRING_PTR(digest));
+
+  return digest;
+}
+
+/* :nodoc: private method
+ * initialize the ctx with the bitlength
+ */
 static void
 sha3_init(hashState *ctx, size_t bitlen) {
 	switch (Init(ctx, bitlen)) {
@@ -36,25 +86,10 @@ sha3_init(hashState *ctx, size_t bitlen) {
 	}
 }
 
-static void
-sha3_init_func(hashState *ctx) {
-	Init(ctx, ctx->capacity / 2);
-}
-
-static void
-sha3_update_func(hashState *ctx, unsigned char *str, size_t len) {
-	Update(ctx, str, len * 8);
-}
-
-static VALUE
-rb_sha3_alloc(VALUE klass) {
-	hashState *ctx;
-
-	ctx = (hashState *) xmalloc(sizeof(hashState));
-	sha3_init(ctx, DEFAULT_DIGEST_LEN);
-	return Data_Wrap_Struct(klass, 0, xfree, ctx);
-}
-
+/* Ruby method.  Digest::SHA3.new(hashlen)
+ * @param hashlen The length of hash, only supports 224, 256, 384 or 512
+ * @returns [Digest::SHA3] new object.
+ */
 static VALUE
 rb_sha3_initialize(int argc, VALUE *argv, VALUE self) {
 	hashState *ctx;
@@ -66,46 +101,35 @@ rb_sha3_initialize(int argc, VALUE *argv, VALUE self) {
 	} else {
 		i_hashlen = NUM2INT(hashlen);
 	}
-	switch (i_hashlen) {
-	case 0:
+	if ( i_hashlen == 0) {
 		rb_raise(rb_eArgError, "Unsupported hash length");
-	case DEFAULT_DIGEST_LEN:
-		break;
-	default:
-		Data_Get_Struct(self, hashState, ctx);
-		sha3_init(ctx, i_hashlen);
   }
 
-	return self;
-}
-
-static VALUE
-rb_sha3_finish(VALUE self) {
-	hashState *ctx;
-	VALUE digest;
-
-	Data_Get_Struct(self, hashState, ctx);
-
-	digest = rb_str_new(0, ctx->capacity / 2 / 8);
-
-	Final(ctx, (unsigned char *)RSTRING_PTR(digest));
-
-	return digest;
+  ctx = (hashState *)RTYPEDDATA_DATA(self);
+	sha3_init(ctx, i_hashlen);
+
+	return rb_call_super(0, NULL);
 }
 
+/* Ruby method.  Digest::SHA3#digest_length
+ * @returns [Numeric] Length of the digest.
+ */
 static VALUE
 rb_sha3_digest_length(VALUE self) {
 	hashState *ctx;
 
-	Data_Get_Struct(self, hashState, ctx);
+	ctx = (hashState *)RTYPEDDATA_DATA(self);
 	return INT2FIX(ctx->capacity / 2 / 8);
 }
 
+/* Ruby method.  Digest::SHA3#block_length
+ * @returns [Numeric] Length of blocks in this digest.
+ */
 static VALUE
 rb_sha3_block_length(VALUE self) {
 	hashState *ctx;
 
-	Data_Get_Struct(self, hashState, ctx);
+	ctx = (hashState *)RTYPEDDATA_DATA(self);
 	return INT2FIX(ctx->rate / 8);
 }
 
@@ -120,11 +144,10 @@ Init_sha3() {
 
 	cSHA3 = rb_define_class_under(mDigest, "SHA3", cDigest_Base);
 
-	rb_ivar_set(cSHA3, rb_intern("metadata"), Data_Wrap_Struct(rb_cObject, 0, 0, &sha3));
+	rb_iv_set(cSHA3, "metadata", Data_Wrap_Struct(0, 0, 0, (void *)&sha3));
 
-	rb_define_alloc_func(cSHA3, rb_sha3_alloc);
   rb_define_method(cSHA3, "initialize", rb_sha3_initialize, -1);
-	rb_define_private_method(cSHA3, "finish", rb_sha3_finish, 0);
   rb_define_method(cSHA3, "digest_length", rb_sha3_digest_length, 0);
   rb_define_method(cSHA3, "block_length", rb_sha3_block_length, 0);
+  rb_define_method(cSHA3, "finish", rb_sha3_finish, 0);
 }

lib/digest/sha3/version.rb

@@ -1,7 +1,7 @@
 module Digest
   class SHA3
     module Version
-      STRING = "1.0.2"
+      STRING = "1.1.0"
     end
   end
 end