1 files changed, 40 insertions, 0 deletions
diff --git a/src/auth/password-scheme-otp.c b/src/auth/password-scheme-otp.c
new file mode 100644
index 0000000..ad7951b
--- /dev/null
+++ b/src/auth/password-scheme-otp.c
@@ -0,0 +1,40 @@
+/*
+ * OTP password scheme.
+ *
+ * Copyright (c) 2006 Andrey Panin <pazke@donpac.ru>
+ *
+ * This software is released under the MIT license.
+ */
+
+#include "lib.h"
+#include "hex-binary.h"
+#include "password-scheme.h"
+#include "randgen.h"
+#include "otp.h"
+
+int password_generate_otp(const char *pw, const char *state_data,
+			  unsigned int algo, const char **result_r)
+{
+	struct otp_state state;
+
+	if (state_data != NULL) {
+		if (otp_parse_dbentry(state_data, &state) != 0)
+			return -1;
+	} else {
+		/* Generate new OTP credentials from plaintext */
+		unsigned char random_data[OTP_MAX_SEED_LEN / 2];
+		const char *random_hex;
+
+		random_fill(random_data, sizeof(random_data));
+		random_hex = binary_to_hex(random_data, sizeof(random_data));
+		if (i_strocpy(state.seed, random_hex, sizeof(state.seed)) < 0)
+			i_unreached();
+
+		state.seq = 1024;
+		state.algo = algo;
+	}
+
+	otp_hash(state.algo, state.seed, pw, state.seq, state.hash);
+	*result_r = otp_print_dbentry(&state);
+	return 0;
+}