allow choice of digest algorithm in certificate generation

src/libstrongswan/credentials/builder.c

@@ -36,6 +36,7 @@ ENUM(builder_part_names, BUILD_FROM_FILE, BUILD_END,
 	"BUILD_NOT_BEFORE_TIME",
 	"BUILD_NOT_AFTER_TIME",
 	"BUILD_SERIAL",
+	"BUILD_DIGEST_ALG",
 	"BUILD_IETF_GROUP_ATTR",
 	"BUILD_CA_CERT",
 	"BUILD_CERT",

src/libstrongswan/credentials/builder.h

@@ -80,6 +80,8 @@ enum builder_part_t {
 	BUILD_NOT_AFTER_TIME,
 	/** a serial number in binary form, chunk_t */
 	BUILD_SERIAL,
+	/** digest algorithm to be used for signature, int */
+	BUILD_DIGEST_ALG,
 	/** a comma-separated list of ietf group attributes, char* */
 	BUILD_IETF_GROUP_ATTR,
 	/** a ca certificate, certificate_t* */

src/libstrongswan/credentials/credential_factory.c

@@ -198,6 +198,9 @@ static void* create(private_credential_factory_t *this, credential_type_t type,
 				case BUILD_FROM_FD:
 					builder->add(builder, part, va_arg(args, u_int));
 					continue;
+				case BUILD_DIGEST_ALG:
+					builder->add(builder, part, va_arg(args, int));
+					continue;
 				case BUILD_NOT_BEFORE_TIME:
 				case BUILD_NOT_AFTER_TIME:
 					builder->add(builder, part, va_arg(args, time_t));