diff --git a/doc/etcp_config.txt b/doc/etcp_config.txt
index 06fd521..3a06b15 100755
--- a/doc/etcp_config.txt
+++ b/doc/etcp_config.txt
@@ -5,6 +5,6 @@
 виртуальные сокеты - плохо т.к. используются ip/port для поиск подключения
 
 
-план:
 
-1. доработать тест чтобы после init соединения еще и посылал пакеты
+./configure --with-openssl    - openssl
+./configure --without-openssl - tinycrypt
diff --git a/lib/sha256.c b/lib/sha256.c
index f8c4292..84691b3 100755
--- a/lib/sha256.c
+++ b/lib/sha256.c
@@ -1,158 +1,158 @@
-/*********************************************************************
-* Filename:   sha256.c
-* Author:     Brad Conte (brad AT bradconte.com)
-* Copyright:
-* Disclaimer: This code is presented "as is" without any guarantees.
-* Details:    Implementation of the SHA-256 hashing algorithm.
-              SHA-256 is one of the three algorithms in the SHA2
-              specification. The others, SHA-384 and SHA-512, are not
-              offered in this implementation.
-              Algorithm specification can be found here:
-               * http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf
-              This implementation uses little endian byte order.
-*********************************************************************/
-
-/*************************** HEADER FILES ***************************/
-#include <stdlib.h>
-#include <memory.h>
-#include "sha256.h"
-
-/****************************** MACROS ******************************/
-#define ROTLEFT(a,b) (((a) << (b)) | ((a) >> (32-(b))))
-#define ROTRIGHT(a,b) (((a) >> (b)) | ((a) << (32-(b))))
-
-#define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
-#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
-#define EP0(x) (ROTRIGHT(x,2) ^ ROTRIGHT(x,13) ^ ROTRIGHT(x,22))
-#define EP1(x) (ROTRIGHT(x,6) ^ ROTRIGHT(x,11) ^ ROTRIGHT(x,25))
-#define SIG0(x) (ROTRIGHT(x,7) ^ ROTRIGHT(x,18) ^ ((x) >> 3))
-#define SIG1(x) (ROTRIGHT(x,17) ^ ROTRIGHT(x,19) ^ ((x) >> 10))
-
-/**************************** VARIABLES *****************************/
-static const WORD k[64] = {
-	0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
-	0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
-	0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
-	0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
-	0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
-	0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
-	0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
-	0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
-};
-
-/*********************** FUNCTION DEFINITIONS ***********************/
-void sha256_transform(SHA256_CTX *ctx, const BYTE data[])
-{
-	WORD a, b, c, d, e, f, g, h, i, j, t1, t2, m[64];
-
-	for (i = 0, j = 0; i < 16; ++i, j += 4)
-		m[i] = (data[j] << 24) | (data[j + 1] << 16) | (data[j + 2] << 8) | (data[j + 3]);
-	for ( ; i < 64; ++i)
-		m[i] = SIG1(m[i - 2]) + m[i - 7] + SIG0(m[i - 15]) + m[i - 16];
-
-	a = ctx->state[0];
-	b = ctx->state[1];
-	c = ctx->state[2];
-	d = ctx->state[3];
-	e = ctx->state[4];
-	f = ctx->state[5];
-	g = ctx->state[6];
-	h = ctx->state[7];
-
-	for (i = 0; i < 64; ++i) {
-		t1 = h + EP1(e) + CH(e,f,g) + k[i] + m[i];
-		t2 = EP0(a) + MAJ(a,b,c);
-		h = g;
-		g = f;
-		f = e;
-		e = d + t1;
-		d = c;
-		c = b;
-		b = a;
-		a = t1 + t2;
-	}
-
-	ctx->state[0] += a;
-	ctx->state[1] += b;
-	ctx->state[2] += c;
-	ctx->state[3] += d;
-	ctx->state[4] += e;
-	ctx->state[5] += f;
-	ctx->state[6] += g;
-	ctx->state[7] += h;
-}
-
-void sha256_init(SHA256_CTX *ctx)
-{
-	ctx->datalen = 0;
-	ctx->bitlen = 0;
-	ctx->state[0] = 0x6a09e667;
-	ctx->state[1] = 0xbb67ae85;
-	ctx->state[2] = 0x3c6ef372;
-	ctx->state[3] = 0xa54ff53a;
-	ctx->state[4] = 0x510e527f;
-	ctx->state[5] = 0x9b05688c;
-	ctx->state[6] = 0x1f83d9ab;
-	ctx->state[7] = 0x5be0cd19;
-}
-
-void sha256_update(SHA256_CTX *ctx, const BYTE data[], size_t len)
-{
-	WORD i;
-
-	for (i = 0; i < len; ++i) {
-		ctx->data[ctx->datalen] = data[i];
-		ctx->datalen++;
-		if (ctx->datalen == 64) {
-			sha256_transform(ctx, ctx->data);
-			ctx->bitlen += 512;
-			ctx->datalen = 0;
-		}
-	}
-}
-
-void sha256_final(SHA256_CTX *ctx, BYTE hash[])
-{
-	WORD i;
-
-	i = ctx->datalen;
-
-	// Pad whatever data is left in the buffer.
-	if (ctx->datalen < 56) {
-		ctx->data[i++] = 0x80;
-		while (i < 56)
-			ctx->data[i++] = 0x00;
-	}
-	else {
-		ctx->data[i++] = 0x80;
-		while (i < 64)
-			ctx->data[i++] = 0x00;
-		sha256_transform(ctx, ctx->data);
-		memset(ctx->data, 0, 56);
-	}
-
-	// Append to the padding the total message's length in bits and transform.
-	ctx->bitlen += ctx->datalen * 8;
-	ctx->data[63] = ctx->bitlen;
-	ctx->data[62] = ctx->bitlen >> 8;
-	ctx->data[61] = ctx->bitlen >> 16;
-	ctx->data[60] = ctx->bitlen >> 24;
-	ctx->data[59] = ctx->bitlen >> 32;
-	ctx->data[58] = ctx->bitlen >> 40;
-	ctx->data[57] = ctx->bitlen >> 48;
-	ctx->data[56] = ctx->bitlen >> 56;
-	sha256_transform(ctx, ctx->data);
-
-	// Since this implementation uses little endian byte ordering and SHA uses big endian,
-	// reverse all the bytes when copying the final state to the output hash.
-	for (i = 0; i < 4; ++i) {
-		hash[i]      = (ctx->state[0] >> (24 - i * 8)) & 0x000000ff;
-		hash[i + 4]  = (ctx->state[1] >> (24 - i * 8)) & 0x000000ff;
-		hash[i + 8]  = (ctx->state[2] >> (24 - i * 8)) & 0x000000ff;
-		hash[i + 12] = (ctx->state[3] >> (24 - i * 8)) & 0x000000ff;
-		hash[i + 16] = (ctx->state[4] >> (24 - i * 8)) & 0x000000ff;
-		hash[i + 20] = (ctx->state[5] >> (24 - i * 8)) & 0x000000ff;
-		hash[i + 24] = (ctx->state[6] >> (24 - i * 8)) & 0x000000ff;
-		hash[i + 28] = (ctx->state[7] >> (24 - i * 8)) & 0x000000ff;
-	}
-}
+/*********************************************************************
+* Filename:   sha256.c
+* Author:     Brad Conte (brad AT bradconte.com)
+* Copyright:
+* Disclaimer: This code is presented "as is" without any guarantees.
+* Details:    Implementation of the SHA-256 hashing algorithm.
+              SHA-256 is one of the three algorithms in the SHA2
+              specification. The others, SHA-384 and SHA-512, are not
+              offered in this implementation.
+              Algorithm specification can be found here:
+               * http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf
+              This implementation uses little endian byte order.
+*********************************************************************/
+
+/*************************** HEADER FILES ***************************/
+#include <stdlib.h>
+#include <memory.h>
+#include "sha256.h"
+
+/****************************** MACROS ******************************/
+#define ROTLEFT(a,b) (((a) << (b)) | ((a) >> (32-(b))))
+#define ROTRIGHT(a,b) (((a) >> (b)) | ((a) << (32-(b))))
+
+#define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
+#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
+#define EP0(x) (ROTRIGHT(x,2) ^ ROTRIGHT(x,13) ^ ROTRIGHT(x,22))
+#define EP1(x) (ROTRIGHT(x,6) ^ ROTRIGHT(x,11) ^ ROTRIGHT(x,25))
+#define SIG0(x) (ROTRIGHT(x,7) ^ ROTRIGHT(x,18) ^ ((x) >> 3))
+#define SIG1(x) (ROTRIGHT(x,17) ^ ROTRIGHT(x,19) ^ ((x) >> 10))
+
+/**************************** VARIABLES *****************************/
+static const uint32_t k[64] = {
+	0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
+	0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
+	0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
+	0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
+	0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
+	0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
+	0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
+	0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
+};
+
+/*********************** FUNCTION DEFINITIONS ***********************/
+static void sc_sha256_transform(SC_SHA256_CTX *ctx, const uint8_t data[])
+{
+	uint32_t a, b, c, d, e, f, g, h, i, j, t1, t2, m[64];
+
+	for (i = 0, j = 0; i < 16; ++i, j += 4)
+		m[i] = (data[j] << 24) | (data[j + 1] << 16) | (data[j + 2] << 8) | (data[j + 3]);
+	for ( ; i < 64; ++i)
+		m[i] = SIG1(m[i - 2]) + m[i - 7] + SIG0(m[i - 15]) + m[i - 16];
+
+	a = ctx->state[0];
+	b = ctx->state[1];
+	c = ctx->state[2];
+	d = ctx->state[3];
+	e = ctx->state[4];
+	f = ctx->state[5];
+	g = ctx->state[6];
+	h = ctx->state[7];
+
+	for (i = 0; i < 64; ++i) {
+		t1 = h + EP1(e) + CH(e,f,g) + k[i] + m[i];
+		t2 = EP0(a) + MAJ(a,b,c);
+		h = g;
+		g = f;
+		f = e;
+		e = d + t1;
+		d = c;
+		c = b;
+		b = a;
+		a = t1 + t2;
+	}
+
+	ctx->state[0] += a;
+	ctx->state[1] += b;
+	ctx->state[2] += c;
+	ctx->state[3] += d;
+	ctx->state[4] += e;
+	ctx->state[5] += f;
+	ctx->state[6] += g;
+	ctx->state[7] += h;
+}
+
+void sc_sha256_init(SC_SHA256_CTX *ctx)
+{
+	ctx->datalen = 0;
+	ctx->bitlen = 0;
+	ctx->state[0] = 0x6a09e667;
+	ctx->state[1] = 0xbb67ae85;
+	ctx->state[2] = 0x3c6ef372;
+	ctx->state[3] = 0xa54ff53a;
+	ctx->state[4] = 0x510e527f;
+	ctx->state[5] = 0x9b05688c;
+	ctx->state[6] = 0x1f83d9ab;
+	ctx->state[7] = 0x5be0cd19;
+}
+
+void sc_sha256_update(SC_SHA256_CTX *ctx, const uint8_t data[], size_t len)
+{
+	uint32_t i;
+
+	for (i = 0; i < len; ++i) {
+		ctx->data[ctx->datalen] = data[i];
+		ctx->datalen++;
+		if (ctx->datalen == 64) {
+			sc_sha256_transform(ctx, ctx->data);
+			ctx->bitlen += 512;
+			ctx->datalen = 0;
+		}
+	}
+}
+
+void sc_sha256_final(SC_SHA256_CTX *ctx, uint8_t hash[])
+{
+	uint32_t i;
+
+	i = ctx->datalen;
+
+	// Pad whatever data is left in the buffer.
+	if (ctx->datalen < 56) {
+		ctx->data[i++] = 0x80;
+		while (i < 56)
+			ctx->data[i++] = 0x00;
+	}
+	else {
+		ctx->data[i++] = 0x80;
+		while (i < 64)
+			ctx->data[i++] = 0x00;
+		sc_sha256_transform(ctx, ctx->data);
+		memset(ctx->data, 0, 56);
+	}
+
+	// Append to the padding the total message's length in bits and transform.
+	ctx->bitlen += ctx->datalen * 8;
+	ctx->data[63] = ctx->bitlen;
+	ctx->data[62] = ctx->bitlen >> 8;
+	ctx->data[61] = ctx->bitlen >> 16;
+	ctx->data[60] = ctx->bitlen >> 24;
+	ctx->data[59] = ctx->bitlen >> 32;
+	ctx->data[58] = ctx->bitlen >> 40;
+	ctx->data[57] = ctx->bitlen >> 48;
+	ctx->data[56] = ctx->bitlen >> 56;
+	sc_sha256_transform(ctx, ctx->data);
+
+	// Since this implementation uses little endian byte ordering and SHA uses big endian,
+	// reverse all the bytes when copying the final state to the output hash.
+	for (i = 0; i < 4; ++i) {
+		hash[i]      = (ctx->state[0] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 4]  = (ctx->state[1] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 8]  = (ctx->state[2] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 12] = (ctx->state[3] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 16] = (ctx->state[4] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 20] = (ctx->state[5] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 24] = (ctx->state[6] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 28] = (ctx->state[7] >> (24 - i * 8)) & 0x000000ff;
+	}
+}
diff --git a/lib/sha256.h b/lib/sha256.h
index 6c75820..a9754f4 100755
--- a/lib/sha256.h
+++ b/lib/sha256.h
@@ -1,34 +1,32 @@
-/*********************************************************************
-* Filename:   sha256.h
-* Author:     Brad Conte (brad AT bradconte.com)
-* Copyright:
-* Disclaimer: This code is presented "as is" without any guarantees.
-* Details:    Defines the API for the corresponding SHA1 implementation.
-*********************************************************************/
-
-#ifndef SHA256_H
-#define SHA256_H
-
-/*************************** HEADER FILES ***************************/
-#include <stddef.h>
-
-/****************************** MACROS ******************************/
-#define SHA256_BLOCK_SIZE 32            // SHA256 outputs a 32 byte digest
-
-/**************************** DATA TYPES ****************************/
-typedef unsigned char BYTE;             // 8-bit byte
-typedef unsigned int  WORD;             // 32-bit word, change to "long" for 16-bit machines
-
-typedef struct {
-	BYTE data[64];
-	WORD datalen;
-	unsigned long long bitlen;
-	WORD state[8];
-} SHA256_CTX;
-
-/*********************** FUNCTION DECLARATIONS **********************/
-void sha256_init(SHA256_CTX *ctx);
-void sha256_update(SHA256_CTX *ctx, const BYTE data[], size_t len);
-void sha256_final(SHA256_CTX *ctx, BYTE hash[]);
-
-#endif   // SHA256_H
+/*********************************************************************
+* Filename:   sha256.h
+* Author:     Brad Conte (brad AT bradconte.com)
+* Copyright:
+* Disclaimer: This code is presented "as is" without any guarantees.
+* Details:    Defines the API for the corresponding SHA1 implementation.
+*********************************************************************/
+
+#ifndef SC_SHA256_H
+#define SC_SHA256_H
+
+/*************************** HEADER FILES ***************************/
+#include <stddef.h>
+#include <stdint.h>
+
+/****************************** MACROS ******************************/
+#define SC_SHA256_BLOCK_SIZE 32            // SHA256 outputs a 32 byte digest
+
+/**************************** DATA TYPES ****************************/
+typedef struct {
+	uint8_t data[64];
+	uint32_t datalen;
+	unsigned long long bitlen;
+	uint32_t state[8];
+} SC_SHA256_CTX;
+
+/*********************** FUNCTION DECLARATIONS **********************/
+void sc_sha256_init(SC_SHA256_CTX *ctx);
+void sc_sha256_update(SC_SHA256_CTX *ctx, const uint8_t data[], size_t len);
+void sc_sha256_final(SC_SHA256_CTX *ctx, uint8_t hash[]);
+
+#endif   // SC_SHA256_H
diff --git a/src/etcp_connections.c b/src/etcp_connections.c
index 578c590..3c851a8 100644
--- a/src/etcp_connections.c
+++ b/src/etcp_connections.c
@@ -75,6 +75,8 @@ static void etcp_link_send_init(struct ETCP_LINK* link) {
     dgram->data[offset++] = link->local_link_id;
 
     memcpy(dgram->data + offset, link->etcp->instance->my_keys.public_key, SC_PUBKEY_SIZE);
+    // Шифруем public_key inplace используя собственный ключ
+    sc_sha_transcode(link->etcp->crypto_ctx.peer_public_key, SC_PUBKEY_SIZE, dgram->data + offset, SC_PUBKEY_SIZE);
     dgram->data_len = offset + SC_PUBKEY_SIZE;
     
     DEBUG_INFO(DEBUG_CATEGORY_CONNECTION, "Sending INIT request to link, node_id=%llu, retry=%d", (unsigned long long)node_id, link->init_retry_count);
@@ -589,6 +591,9 @@ static void etcp_connections_read_callback(int fd, void* arg) {
 //        printf("[ETCP DEBUG] Last 64 bytes of packet (PUBKEY): ");
 //        for (int i=0; i<SC_PUBKEY_SIZE; i++) DEBUG_INFO(DEBUG_CATEGORY_CRYPTO, "%02x ", data[recv_len-SC_PUBKEY_SIZE+i]);
         
+        // Расшифровываем public_key inplace используя собственный ключ
+        sc_sha_transcode(e_sock->instance->my_keys.public_key, SC_PUBKEY_SIZE, data + recv_len - SC_PUBKEY_SIZE, SC_PUBKEY_SIZE);
+        
         if (sc_set_peer_public_key(&sc, &data[recv_len-SC_PUBKEY_SIZE], SC_PEER_PUBKEY_BIN)!=SC_OK) { 
             DEBUG_ERROR(DEBUG_CATEGORY_CRYPTO, "etcp_connections_read_callback: failed to set peer public key during init");
             errorcode=2; 
diff --git a/src/secure_channel.c b/src/secure_channel.c
index 5d927fa..f40a830 100644
--- a/src/secure_channel.c
+++ b/src/secure_channel.c
@@ -14,6 +14,7 @@
 #include <stdio.h>
 #include <fcntl.h>
 #include "crc32.h"
+#include "../lib/sha256.h"
 
 // To switch between implementations, define USE_OPENSSL before including/compiling.
 // If USE_OPENSSL is defined, use OpenSSL; otherwise, use TinyCrypt (original logic).
@@ -803,3 +804,22 @@ sc_status_t sc_compute_public_key_from_private(const uint8_t *private_key, uint8
 }
 
 #endif
+
+sc_status_t sc_sha_transcode(const uint8_t *key, size_t key_len, uint8_t *data, size_t data_len) {
+    if (!key || !data || key_len == 0 || data_len == 0) {
+        return SC_ERR_INVALID_ARG;
+    }
+    
+    uint8_t sha_hash[SC_SHA256_BLOCK_SIZE];
+    SC_SHA256_CTX ctx;
+    
+    sc_sha256_init(&ctx);
+    sc_sha256_update(&ctx, key, key_len);
+    sc_sha256_final(&ctx, sha_hash);
+    
+    for (size_t i = 0; i < data_len; i++) {
+        data[i] ^= sha_hash[i % SC_SHA256_BLOCK_SIZE];
+    }
+    
+    return SC_OK;
+}
diff --git a/src/secure_channel.h b/src/secure_channel.h
index 73abc08..25cce1f 100644
--- a/src/secure_channel.h
+++ b/src/secure_channel.h
@@ -65,4 +65,7 @@ sc_status_t sc_compute_public_key_from_private(const uint8_t *private_key, uint8
 sc_status_t sc_encrypt(sc_context_t *ctx, const uint8_t *plaintext,  size_t plaintext_len,  uint8_t *ciphertext, size_t *ciphertext_len);
 sc_status_t sc_decrypt(sc_context_t *ctx, const uint8_t *ciphertext, size_t ciphertext_len, uint8_t *plaintext,  size_t *plaintext_len);
 
+// SHA256-based transcode: XOR data with SHA256(key)
+sc_status_t sc_sha_transcode(const uint8_t *key, size_t key_len, uint8_t *data, size_t data_len);
+
 #endif // SECURE_CHANNEL_H
diff --git a/tests/test_crypto b/tests/test_crypto
index 0209165..21596a1 100755
Binary files a/tests/test_crypto and b/tests/test_crypto differ
diff --git a/tests/test_ecc_encrypt b/tests/test_ecc_encrypt
index 525a2db..c700554 100755
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