Add support for CMAC

ext/openssl/ossl.c

@@ -1040,6 +1040,7 @@ Init_openssl(void)
     Init_ossl_engine();
     Init_ossl_hmac();
     Init_ossl_kdf();
+    Init_ossl_mac();
     Init_ossl_ns_spki();
     Init_ossl_ocsp();
     Init_ossl_pkcs12();

ext/openssl/ossl.h

@@ -187,6 +187,7 @@ extern VALUE dOSSL;
 #include "ossl_digest.h"
 #include "ossl_engine.h"
 #include "ossl_hmac.h"
+#include "ossl_mac.h"
 #include "ossl_kdf.h"
 #include "ossl_ns_spki.h"
 #include "ossl_ocsp.h"

ext/openssl/ossl_mac.c

@@ -0,0 +1,174 @@
+#include "ossl.h"
+
+#if OSSL_OPENSSL_PREREQ(3, 0, 0)
+
+#define NewMAC(klass)                                   \
+    TypedData_Wrap_Struct((klass), &ossl_mac_type, 0)
+#define SetMAC(obj, ctx) do {                                           \
+        if (!(ctx))                                                     \
+            ossl_raise(rb_eRuntimeError, "MAC wasn't initialized");     \
+        RTYPEDDATA_DATA(obj) = (ctx);                                   \
+    } while (0)
+#define GetMAC(obj, ctx) do {                                           \
+        TypedData_Get_Struct((obj), EVP_MAC_CTX, &ossl_mac_type, (ctx)); \
+        if (!(ctx))                                                     \
+            ossl_raise(rb_eRuntimeError, "MAC wasn't initialized");     \
+    } while (0)
+
+/*
+ * Classes
+ */
+static VALUE cMAC;
+static VALUE cCMAC;
+static VALUE eMACError;
+
+/*
+ * Public
+ */
+
+/*
+ * Private
+ */
+static void
+ossl_mac_free(void *ctx)
+{
+    EVP_MAC_CTX_free(ctx);
+}
+
+static const rb_data_type_t ossl_mac_type = {
+    "OpenSSL/MAC",
+    {
+        0, ossl_mac_free,
+    },
+    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
+};
+
+static VALUE
+ossl_mac_alloc(VALUE klass)
+{
+    return NewMAC(klass);
+}
+
+static VALUE
+ossl_mac_initialize(VALUE self, VALUE algorithm)
+{
+    EVP_MAC *mac;
+    EVP_MAC_CTX *ctx;
+
+    mac = EVP_MAC_fetch(NULL, StringValueCStr(algorithm), NULL);
+    if (!mac)
+        ossl_raise(eMACError, "EVP_MAC_fetch");
+    ctx = EVP_MAC_CTX_new(mac);
+    if (!ctx) {
+        EVP_MAC_free(mac);
+        ossl_raise(eMACError, "EVP_MAC_CTX_new");
+    }
+    SetMAC(self, ctx);
+
+    return self;
+}
+
+static VALUE
+ossl_cmac_initialize(VALUE self, VALUE cipher, VALUE key)
+{
+    EVP_MAC_CTX *ctx;
+    VALUE algorithm;
+    OSSL_PARAM params[2];
+
+    algorithm = rb_str_new_literal("CMAC");
+    rb_call_super(1, &algorithm);
+
+    GetMAC(self, ctx);
+    StringValue(key);
+    params[0] = OSSL_PARAM_construct_utf8_string("cipher", StringValueCStr(cipher), 0);
+    params[1] = OSSL_PARAM_construct_end();
+    if (EVP_MAC_init(ctx, (unsigned char *)RSTRING_PTR(key), RSTRING_LEN(key), params) != 1)
+        ossl_raise(eMACError, "EVP_MAC_init");
+
+    return self;
+}
+
+static VALUE
+ossl_mac_copy(VALUE self, VALUE other)
+{
+    EVP_MAC_CTX *ctx1, *ctx2;
+
+    rb_check_frozen(self);
+    if (self == other)
+        return self;
+
+    GetMAC(other, ctx1);
+    ctx2 = EVP_MAC_CTX_dup(ctx1);
+    if (!ctx2)
+        ossl_raise(eMACError, "EVP_MAC_CTX_dup");
+    SetMAC(self, ctx2);
+
+    return self;
+}
+
+static VALUE
+ossl_mac_update(VALUE self, VALUE chunk)
+{
+    EVP_MAC_CTX *ctx;
+
+    GetMAC(self, ctx);
+    StringValue(chunk);
+    if (EVP_MAC_update(ctx, (unsigned char *)RSTRING_PTR(chunk), RSTRING_LEN(chunk)) != 1)
+        ossl_raise(eMACError, "EVP_MAC_update");
+
+    return self;
+}
+
+static VALUE
+ossl_mac_mac(VALUE self)
+{
+    VALUE ret;
+    EVP_MAC_CTX *ctx1, *ctx2;
+    size_t len;
+
+    GetMAC(self, ctx1);
+    if (EVP_MAC_final(ctx1, NULL, &len, 0) != 1)
+        ossl_raise(eMACError, "EVP_MAC_final");
+    ret = rb_str_new(NULL, len);
+    ctx2 = EVP_MAC_CTX_dup(ctx1);
+    if (!ctx2)
+        ossl_raise(eMACError, "EVP_MAC_CTX_dup");
+    if (EVP_MAC_final(ctx2, (unsigned char *)RSTRING_PTR(ret), &len, RSTRING_LEN(ret)) != 1) {
+        EVP_MAC_CTX_free(ctx2);
+        ossl_raise(eMACError, "EVP_MAC_final");
+    }
+    EVP_MAC_CTX_free(ctx2);
+
+    return ret;
+}
+
+/*
+ * INIT
+ */
+void
+Init_ossl_mac(void)
+{
+#if 0
+    mOSSL = rb_define_module("OpenSSL");
+    eOSSLError = rb_define_class_under(mOSSL, "OpenSSLError", rb_eStandardError);
+#endif
+
+    cMAC = rb_define_class_under(mOSSL, "MAC", rb_cObject);
+    rb_define_alloc_func(cMAC, ossl_mac_alloc);
+    rb_define_method(cMAC, "initialize", ossl_mac_initialize, 1);
+    rb_define_method(cMAC, "initialize_copy", ossl_mac_copy, 1);
+    rb_define_method(cMAC, "update", ossl_mac_update, 1);
+    rb_define_alias(cMAC, "<<", "update");
+    rb_define_method(cMAC, "mac", ossl_mac_mac, 0);
+
+    cCMAC = rb_define_class_under(cMAC, "CMAC", cMAC);
+    rb_define_method(cCMAC, "initialize", ossl_cmac_initialize, 2);
+
+    eMACError = rb_define_class_under(mOSSL, "MACError", eOSSLError);
+}
+#else
+void
+Init_ossl_mac(void)
+{
+}
+#endif

ext/openssl/ossl_mac.h

@@ -0,0 +1,6 @@
+#if !defined(_OSSL_MAC_H_)
+#define _OSSL_MAC_H_
+
+void Init_ossl_mac(void);
+
+#endif /* _OSSL_MAC_H_ */

lib/openssl.rb

@@ -18,6 +18,7 @@
 require_relative 'openssl/cipher'
 require_relative 'openssl/digest'
 require_relative 'openssl/hmac'
+require_relative 'openssl/mac'
 require_relative 'openssl/x509'
 require_relative 'openssl/ssl'
 require_relative 'openssl/pkcs5'

lib/openssl/mac.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module OpenSSL
+  if defined?(MAC)
+    class MAC
+      def ==(other)
+        return false unless self.class === other
+        return false unless self.mac.bytesize == other.mac.bytesize
+
+        OpenSSL.fixed_length_secure_compare(self.mac, other.mac)
+      end
+
+      def hexmac
+        mac.unpack1('H*')
+      end
+      alias inspect hexmac
+      alias to_s hexmac
+
+      def base64mac
+        [mac].pack('m0')
+      end
+
+      class CMAC < MAC
+        class << self
+          def mac(cipher, key, message)
+            cmac = new(cipher, key)
+            cmac << message
+            cmac.send(__callee__)
+          end
+          alias hexmac mac
+          alias base64mac mac
+        end
+      end
+    end
+  end
+end

test/openssl/test_cmac.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+require_relative "utils"
+
+if defined?(OpenSSL::MAC::CMAC)
+
+class OpenSSL::TestCMAC < OpenSSL::TestCase
+  def test_cmac
+    cmac = OpenSSL::MAC::CMAC.new("AES-128-CBC", ["2b7e151628aed2a6abf7158809cf4f3c"].pack("H*"))
+    cmac.update(["6bc1bee22e409f96e93d7e117393172a"].pack("H*"))
+    assert_equal ["070a16b46b4d4144f79bdd9dd04a287c"].pack("H*"), cmac.mac
+    assert_equal "070a16b46b4d4144f79bdd9dd04a287c", cmac.hexmac
+    assert_equal "BwoWtGtNQUT3m92d0EoofA==", cmac.base64mac
+  end
+
+  def test_dup
+    cmac1 = OpenSSL::MAC::CMAC.new("AES-192-CBC", ["8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b"].pack("H*"))
+    cmac2 = cmac1.dup
+    assert_equal cmac2, cmac1
+
+    cmac1.update("message")
+    assert_not_equal cmac2, cmac1
+
+    cmac2.update("message")
+    assert_equal cmac2, cmac1
+  end
+
+  def test_class_methods
+    assert_equal ["28a7023f452e8f82bd4bf28d8c37c35c"].pack("H*"), OpenSSL::MAC::CMAC.mac("AES-256-CBC", ["603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"].pack("H*"), ["6bc1bee22e409f96e93d7e117393172a"].pack("H*"))
+    assert_equal "28a7023f452e8f82bd4bf28d8c37c35c", OpenSSL::MAC::CMAC.hexmac("AES-256-CBC", ["603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"].pack("H*"), ["6bc1bee22e409f96e93d7e117393172a"].pack("H*"))
+    assert_equal "KKcCP0Uuj4K9S/KNjDfDXA==", OpenSSL::MAC::CMAC.base64mac("AES-256-CBC", ["603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4"].pack("H*"), ["6bc1bee22e409f96e93d7e117393172a"].pack("H*"))
+  end
+end
+
+end