export-object: Recover public key from algorithm specific attributes

Some tokens such as SoftHSMv2 omits CKA_PUBLIC_KEY_INFO when it can be
derived from algorithm specific attributes, such as CKA_MODULUS and
CKA_PUBLIC_EXPONENT for RSA.  This adds support for it if libtasn1 is
available at compile time.

Signed-off-by: Daiki Ueno <ueno@gnu.org>

common/oid.h

@@ -241,4 +241,7 @@ static const unsigned char P11_OID_RESERVED_PURPOSE[] =
 	{ 0x06, 0x0a, 0x2b, 0x06, 0x01, 0x04, 0x01, 0x99, 0x77, 0x06, 0x0a, 0x10 };
 static const char P11_OID_RESERVED_PURPOSE_STR[] = "1.3.6.1.4.1.3319.6.10.16";
 
+static const char P11_OID_PKIX1_RSA_STR[] = "1.2.840.113549.1.1.1";
+static const char P11_OID_PKIX1_EC_STR[] = "1.2.840.10045.2.1";
+
 #endif

common/pkix.asn

@@ -537,4 +537,8 @@ ProxyPolicy ::= SEQUENCE {
   policyLanguage   OBJECT IDENTIFIER,
   policy           OCTET STRING OPTIONAL }
 
+RSAPublicKey ::= SEQUENCE {
+    modulus INTEGER,
+    publicExponent INTEGER }
+
 END

p11-kit/Makefile.am

@@ -283,6 +283,11 @@ p11_kit_p11_kit_LDADD = \
 	$(LTLIBINTL) \
 	$(NULL)
 
+if WITH_ASN1
+p11_kit_p11_kit_CFLAGS += $(LIBTASN1_CFLAGS)
+p11_kit_p11_kit_LDADD += libp11-asn1.la $(LIBTASN1_LIBS)
+endif
+
 if WITH_BASH_COMPLETION
 bashcomp_DATA += bash-completion/p11-kit
 endif
@@ -312,6 +317,11 @@ p11_kit_p11_kit_testable_CFLAGS = \
 	$(COMMON_CFLAGS) \
 	$(NULL)
 
+if WITH_ASN1
+p11_kit_p11_kit_testable_CFLAGS += $(LIBTASN1_CFLAGS)
+p11_kit_p11_kit_testable_LDADD += libp11-asn1.la $(LIBTASN1_LIBS)
+endif
+
 private_PROGRAMS += p11-kit/p11-kit-remote
 
 p11_kit_p11_kit_remote_SOURCES = \
@@ -416,6 +426,11 @@ sh_tests += \
 	p11-kit/test-lists.sh \
 	p11-kit/test-server.sh \
 	$(NULL)
+
+if WITH_ASN1
+sh_tests += p11-kit/test-export-public.sh
+endif
+
 endif
 
 test_conf_SOURCES = p11-kit/test-conf.c
@@ -522,7 +537,8 @@ check_LTLIBRARIES += \
 	mock-eight.la \
 	mock-nine.la \
 	mock-ten.la \
-	mock-eleven.la
+	mock-eleven.la \
+	mock-twelve.la
 
 mock_one_la_SOURCES = p11-kit/mock-module-ep.c
 mock_one_la_LIBADD = libp11-test.la libp11-common.la
@@ -587,6 +603,10 @@ mock_eleven_la_SOURCES = p11-kit/mock-module-ep9.c
 mock_eleven_la_LDFLAGS = $(mock_one_la_LDFLAGS)
 mock_eleven_la_LIBADD = $(mock_one_la_LIBADD)
 
+mock_twelve_la_SOURCES = p11-kit/mock-module-ep10.c
+mock_twelve_la_LDFLAGS = $(mock_one_la_LDFLAGS)
+mock_twelve_la_LIBADD = $(mock_one_la_LIBADD)
+
 EXTRA_DIST += \
 	p11-kit/fixtures \
 	p11-kit/templates \
@@ -597,4 +617,5 @@ EXTRA_DIST += \
 	p11-kit/test-lists.sh \
 	p11-kit/test-messages.sh \
 	p11-kit/test-server.sh \
+	p11-kit/test-export-public.sh \
 	$(NULL)