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+/**********************************************************************
+ *                        gost89.h                                    *
+ *             Copyright (c) 2005-2006 Cryptocom LTD                  *
+ *     This file is distributed under the same license as OpenSSL     *
+ *                                                                    *
+ *          Declarations for GOST 28147-89 encryption algorithm       *
+ *            No OpenSSL libraries required to compile and use        *
+ *                       this code                                    *
+ **********************************************************************/
+#ifndef GOST89_H
+# define GOST89_H
+
+/* Typedef for unsigned 32-bit integer */
+# if __LONG_MAX__ > 2147483647L
+typedef unsigned int u4;
+# else
+typedef unsigned long u4;
+# endif
+/* Typedef for unsigned 8-bit integer */
+typedef unsigned char byte;
+
+/* Internal representation of GOST substitution blocks */
+typedef struct {
+    byte k8[16];
+    byte k7[16];
+    byte k6[16];
+    byte k5[16];
+    byte k4[16];
+    byte k3[16];
+    byte k2[16];
+    byte k1[16];
+} gost_subst_block;
+
+/* Cipher context includes key and preprocessed  substitution block */
+typedef struct {
+    u4 k[8];
+    /* Constant s-boxes -- set up in gost_init(). */
+    u4 k87[256], k65[256], k43[256], k21[256];
+} gost_ctx;
+/*
+ * Note: encrypt and decrypt expect full blocks--padding blocks is caller's
+ * responsibility. All bulk encryption is done in ECB mode by these calls.
+ * Other modes may be added easily enough.
+ */
+/* Encrypt several full blocks in ECB mode */
+void gost_enc(gost_ctx * ctx, const byte * clear, byte * cipher, int blocks);
+/* Decrypt several full blocks in ECB mode */
+void gost_dec(gost_ctx * ctx, const byte * cipher, byte * clear, int blocks);
+/* Encrypts several full blocks in CFB mode using 8byte IV */
+void gost_enc_cfb(gost_ctx * ctx, const byte * iv, const byte * clear,
+                  byte * cipher, int blocks);
+/* Decrypts several full blocks in CFB mode using 8byte IV */
+void gost_dec_cfb(gost_ctx * ctx, const byte * iv, const byte * cipher,
+                  byte * clear, int blocks);
+
+/* Encrypt one  block */
+void gostcrypt(gost_ctx * c, const byte * in, byte * out);
+/* Decrypt one  block */
+void gostdecrypt(gost_ctx * c, const byte * in, byte * out);
+/* Set key into context */
+void gost_key(gost_ctx * ctx, const byte * key);
+/* Get key from context */
+void gost_get_key(gost_ctx * ctx, byte * key);
+/* Set S-blocks into context */
+void gost_init(gost_ctx * ctx, const gost_subst_block * subst_block);
+/* Clean up context */
+void gost_destroy(gost_ctx * ctx);
+/* Intermediate function used for calculate hash */
+void gost_enc_with_key(gost_ctx *, byte * key, byte * inblock,
+                       byte * outblock);
+/* Compute MAC of given length in bits from data */
+int gost_mac(gost_ctx * ctx, int hmac_len, const unsigned char *data,
+             unsigned int data_len, unsigned char *hmac);
+/*
+ * Compute MAC of given length in bits from data, using non-zero 8-byte IV
+ * (non-standard, for use in CryptoPro key transport only
+ */
+int gost_mac_iv(gost_ctx * ctx, int hmac_len, const unsigned char *iv,
+                const unsigned char *data, unsigned int data_len,
+                unsigned char *hmac);
+/* Perform one step of MAC calculation like gostcrypt */
+void mac_block(gost_ctx * c, byte * buffer, const byte * block);
+/* Extracts MAC value from mac state buffer */
+void get_mac(byte * buffer, int nbits, byte * out);
+/* Implements cryptopro key meshing algorithm. Expect IV to be 8-byte size*/
+void cryptopro_key_meshing(gost_ctx * ctx, unsigned char *iv);
+/* Parameter sets specified in RFC 4357 */
+extern gost_subst_block GostR3411_94_TestParamSet;
+extern gost_subst_block GostR3411_94_CryptoProParamSet;
+extern gost_subst_block Gost28147_TestParamSet;
+extern gost_subst_block Gost28147_CryptoProParamSetA;
+extern gost_subst_block Gost28147_CryptoProParamSetB;
+extern gost_subst_block Gost28147_CryptoProParamSetC;
+extern gost_subst_block Gost28147_CryptoProParamSetD;
+extern const byte CryptoProKeyMeshingKey[];
+typedef unsigned int word32;
+
+#endif