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diff --git a/src/lib/defaults.h b/src/lib/defaults.h
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+/*
+ * Copyright (c) 2018-2021, [Ribose Inc](https://www.ribose.com).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *
+ * 2.  Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DEFAULTS_H_
+#define DEFAULTS_H_
+
+/* Default hash algorithm as PGP constant */
+#define DEFAULT_PGP_HASH_ALG PGP_HASH_SHA256
+
+/* Default symmetric algorithm as PGP constant */
+#define DEFAULT_PGP_SYMM_ALG PGP_SA_AES_256
+
+/* Default number of msec to run S2K derivation */
+#define DEFAULT_S2K_MSEC 150
+
+/* Default number of msec to run S2K tuning */
+#define DEFAULT_S2K_TUNE_MSEC 10
+
+/* Default compression algorithm and level */
+#define DEFAULT_Z_ALG "ZIP"
+#define DEFAULT_Z_LEVEL 6
+
+/* Default AEAD algorithm */
+#define DEFAULT_AEAD_ALG PGP_AEAD_OCB
+
+/* Default AEAD chunk bits, equals to 256K chunks */
+#define DEFAULT_AEAD_CHUNK_BITS 12
+
+/* Default cipher mode for secret key encryption */
+#define DEFAULT_CIPHER_MODE "CFB"
+
+/* Default cipher mode for secret key encryption */
+#define DEFAULT_PGP_CIPHER_MODE PGP_CIPHER_MODE_CFB
+
+/* Default public key algorithm for new key generation */
+#define DEFAULT_PK_ALG PGP_PKA_RSA
+
+/* Default RSA key length */
+#define DEFAULT_RSA_NUMBITS 2048
+
+/* Default ElGamal key length */
+#define DEFAULT_ELGAMAL_NUMBITS 2048
+#define ELGAMAL_MIN_P_BITLEN 1024
+#define ELGAMAL_MAX_P_BITLEN 4096
+
+/* Default, min and max DSA key length */
+#define DSA_MIN_P_BITLEN 1024
+#define DSA_MAX_P_BITLEN 3072
+#define DSA_DEFAULT_P_BITLEN 2048
+
+/* Default EC curve */
+#define DEFAULT_CURVE "NIST P-256"
+
+/* Default maximum password request attempts */
+#define MAX_PASSWORD_ATTEMPTS 3
+
+/* Infinite password request attempts */
+#define INFINITE_ATTEMPTS -1
+
+/* Default key expiration in seconds, 2 years */
+#define DEFAULT_KEY_EXPIRATION (2 * 365 * 24 * 60 * 60)
+
+#endif