1 files changed, 84 insertions, 0 deletions
diff --git a/comm/third_party/libotr/src/sm.h b/comm/third_party/libotr/src/sm.h
new file mode 100644
index 0000000000..53703ff301
--- /dev/null
+++ b/comm/third_party/libotr/src/sm.h
@@ -0,0 +1,84 @@
+/*
+ *  Off-the-Record Messaging library
+ *  Copyright (C) 2004-2012  Ian Goldberg, Chris Alexander, Willy Lew,
+ *  			     Nikita Borisov
+ *                           <otr@cypherpunks.ca>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of version 2.1 of the GNU Lesser General
+ *  Public License as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __SM_H__
+#define __SM_H__
+
+#include <gcrypt.h>
+
+#define SM_HASH_ALGORITHM GCRY_MD_SHA256
+#define SM_DIGEST_SIZE 32
+
+typedef enum {
+    OTRL_SMP_EXPECT1,
+    OTRL_SMP_EXPECT2,
+    OTRL_SMP_EXPECT3,
+    OTRL_SMP_EXPECT4,
+    OTRL_SMP_EXPECT5
+} NextExpectedSMP;
+
+typedef enum {
+    OTRL_SMP_PROG_OK = 0,            /* All is going fine so far */
+    OTRL_SMP_PROG_CHEATED = -2,      /* Some verification failed */
+    OTRL_SMP_PROG_FAILED = -1,       /* The secrets didn't match */
+    OTRL_SMP_PROG_SUCCEEDED = 1      /* The SMP completed successfully */
+} OtrlSMProgState;
+
+typedef struct {
+    gcry_mpi_t secret, x2, x3, g1, g2, g3, g3o, p, q, pab, qab;
+    NextExpectedSMP nextExpected;
+    int received_question;  /* 1 if we received a question in an SMP1Q TLV */
+    OtrlSMProgState sm_prog_state;
+} OtrlSMState;
+
+typedef OtrlSMState OtrlSMAliceState;
+typedef OtrlSMState OtrlSMBobState;
+
+/*
+ * Call this once, at plugin load time.  It sets up the modulus and
+ * generator MPIs.
+ */
+void otrl_sm_init(void);
+
+/*
+ * Initialize the fields of a SM state.
+ */
+void otrl_sm_state_new(OtrlSMState *smst);
+
+/*
+ * Initialize the fields of a SM state.  Called the first time that
+ * a user begins an SMP session.
+ */
+void otrl_sm_state_init(OtrlSMState *smst);
+
+/*
+ * Deallocate the contents of a OtrlSMState (but not the OtrlSMState
+ * itself)
+ */
+void otrl_sm_state_free(OtrlSMState *smst);
+
+gcry_error_t otrl_sm_step1(OtrlSMAliceState *astate, const unsigned char* secret, int secretlen, unsigned char** output, int* outputlen);
+gcry_error_t otrl_sm_step2a(OtrlSMBobState *bstate, const unsigned char* input, const int inputlen, int received_question);
+gcry_error_t otrl_sm_step2b(OtrlSMBobState *bstate, const unsigned char* secret, int secretlen, unsigned char **output, int* outputlen);
+gcry_error_t otrl_sm_step3(OtrlSMAliceState *astate, const unsigned char* input, const int inputlen, unsigned char **output, int* outputlen);
+gcry_error_t otrl_sm_step4(OtrlSMBobState *bstate, const unsigned char* input, const int inputlen, unsigned char **output, int* outputlen);
+gcry_error_t otrl_sm_step5(OtrlSMAliceState *astate, const unsigned char* input, const int inputlen);
+
+#endif