diff --git a/td/telegram/SecureStorage.cpp b/td/telegram/SecureStorage.cpp
index 74dedcba..1e9b890b 100644
--- a/td/telegram/SecureStorage.cpp
+++ b/td/telegram/SecureStorage.cpp
@@ -43,7 +43,7 @@ Result<ValueHash> calc_value_hash(DataView &data_view) {
 }
 
 BufferSlice gen_random_prefix(int64 data_size) {
-  BufferSlice buff(((32 + 15 + data_size) & -16) - data_size);
+  BufferSlice buff(narrow_cast<size_t>(((32 + 15 + data_size) & -16) - data_size));
   Random::secure_bytes(buff.as_slice());
   buff.as_slice()[0] = narrow_cast<uint8>(buff.size());
   CHECK((buff.size() + data_size) % 16 == 0);
@@ -58,7 +58,7 @@ int64 FileDataView::size() {
 }
 
 Result<BufferSlice> FileDataView::pread(int64 offset, int64 size) {
-  auto slice = BufferSlice(size);
+  auto slice = BufferSlice(narrow_cast<size_t>(size));
   TRY_RESULT(actual_size, fd_.pread(slice.as_slice(), offset));
   if (static_cast<int64>(actual_size) != size) {
     return Status::Error("Not enough data in file");
@@ -69,14 +69,14 @@ Result<BufferSlice> FileDataView::pread(int64 offset, int64 size) {
 BufferSliceDataView::BufferSliceDataView(BufferSlice buffer_slice) : buffer_slice_(std::move(buffer_slice)) {
 }
 int64 BufferSliceDataView::size() {
-  return buffer_slice_.size();
+  return narrow_cast<int64>(buffer_slice_.size());
 }
 Result<BufferSlice> BufferSliceDataView::pread(int64 offset, int64 size) {
   auto end_offset = size + offset;
   if (this->size() < end_offset) {
     return Status::Error("Not enough data in BufferSlice");
   }
-  return BufferSlice(buffer_slice_.as_slice().substr(offset, size));
+  return BufferSlice(buffer_slice_.as_slice().substr(narrow_cast<size_t>(offset), narrow_cast<size_t>(size)));
 }
 
 ConcatDataView::ConcatDataView(DataView &left, DataView &right) : left_(left), right_(right) {
diff --git a/tdutils/td/utils/crypto.cpp b/tdutils/td/utils/crypto.cpp
index afacf153..25e7679e 100644
--- a/tdutils/td/utils/crypto.cpp
+++ b/tdutils/td/utils/crypto.cpp
@@ -15,14 +15,14 @@
 
 #if TD_HAVE_OPENSSL
 #include <openssl/aes.h>
-#include <openssl/engine.h>
+#include <openssl/bio.h>
 #include <openssl/crypto.h>
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
 #include <openssl/md5.h>
-#include <openssl/sha.h>
 #include <openssl/pem.h>
 #include <openssl/rsa.h>
+#include <openssl/sha.h>
 #endif
 
 #if TD_HAVE_ZLIB
@@ -557,8 +557,17 @@ uint64 crc64(Slice data) {
   return crc64_partial(data, static_cast<uint64>(-1)) ^ static_cast<uint64>(-1);
 }
 
+static int get_evp_pkey_type(EVP_PKEY *pkey) {
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+  return EVP_PKEY_type(pkey->type);
+#else
+  return EVP_PKEY_base_id(pkey);
+#endif
+}
+
 Result<BufferSlice> rsa_encrypt_pkcs1_oaep(Slice public_key, Slice data) {
-  BIO *mem_bio = BIO_new_mem_buf(public_key.data(), narrow_cast<int>(public_key.size()));
+  BIO *mem_bio = BIO_new_mem_buf(const_cast<void *>(static_cast<const void *>(public_key.data())),
+                                 narrow_cast<int>(public_key.size()));
   SCOPE_EXIT {
     BIO_vfree(mem_bio);
   };
@@ -567,30 +576,43 @@ Result<BufferSlice> rsa_encrypt_pkcs1_oaep(Slice public_key, Slice data) {
   if (!pkey) {
     return Status::Error("Cannot read public key");
   }
+  SCOPE_EXIT {
+    EVP_PKEY_free(pkey);
+  };
+  if (get_evp_pkey_type(pkey) != EVP_PKEY_RSA) {
+    return Status::Error("Wrong key type, expected RSA");
+  }
+
   EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(pkey, nullptr);
   if (!ctx) {
     return Status::Error("Cannot create EVP_PKEY_CTX");
   }
+  SCOPE_EXIT {
+    EVP_PKEY_CTX_free(ctx);
+  };
+
   if (EVP_PKEY_encrypt_init(ctx) <= 0) {
     return Status::Error("Cannot init EVP_PKEY_CTX");
   }
   if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_OAEP_PADDING) <= 0) {
     return Status::Error("Cannot set RSA_PKCS1_OAEP padding in EVP_PKEY_CTX");
   }
+
   size_t outlen;
   if (EVP_PKEY_encrypt(ctx, nullptr, &outlen, data.ubegin(), data.size()) <= 0) {
     return Status::Error("Cannot calculate encrypted length");
   }
   BufferSlice res(outlen);
   if (EVP_PKEY_encrypt(ctx, res.as_slice().ubegin(), &outlen, data.ubegin(), data.size()) <= 0) {
-    ERR_print_errors_fp(stderr);
+    // ERR_print_errors_fp(stderr);
     return Status::Error("Cannot encrypt");
   }
   return std::move(res);
 }
 
 Result<BufferSlice> rsa_decrypt_pkcs1_oaep(Slice private_key, Slice data) {
-  BIO *mem_bio = BIO_new_mem_buf(private_key.data(), narrow_cast<int>(private_key.size()));
+  BIO *mem_bio = BIO_new_mem_buf(const_cast<void *>(static_cast<const void *>(private_key.data())),
+                                 narrow_cast<int>(private_key.size()));
   SCOPE_EXIT {
     BIO_vfree(mem_bio);
   };
@@ -599,16 +621,28 @@ Result<BufferSlice> rsa_decrypt_pkcs1_oaep(Slice private_key, Slice data) {
   if (!pkey) {
     return Status::Error("Cannot read private key");
   }
+  SCOPE_EXIT {
+    EVP_PKEY_free(pkey);
+  };
+  if (get_evp_pkey_type(pkey) != EVP_PKEY_RSA) {
+    return Status::Error("Wrong key type, expected RSA");
+  }
+
   EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(pkey, nullptr);
   if (!ctx) {
     return Status::Error("Cannot create EVP_PKEY_CTX");
   }
+  SCOPE_EXIT {
+    EVP_PKEY_CTX_free(ctx);
+  };
+
   if (EVP_PKEY_decrypt_init(ctx) <= 0) {
     return Status::Error("Cannot init EVP_PKEY_CTX");
   }
   if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_OAEP_PADDING) <= 0) {
     return Status::Error("Cannot set RSA_PKCS1_OAEP padding in EVP_PKEY_CTX");
   }
+
   size_t outlen;
   if (EVP_PKEY_decrypt(ctx, nullptr, &outlen, data.ubegin(), data.size()) <= 0) {
     return Status::Error("Cannot calculate decrypted length");
diff --git a/tdutils/td/utils/crypto.h b/tdutils/td/utils/crypto.h
index 6e32e08a..fc59b6d0 100644
--- a/tdutils/td/utils/crypto.h
+++ b/tdutils/td/utils/crypto.h
@@ -6,9 +6,9 @@
 //
 #pragma once
 
+#include "td/utils/buffer.h"
 #include "td/utils/common.h"
 #include "td/utils/Slice.h"
-#include "td/utils/buffer.h"
 #include "td/utils/Status.h"
 
 namespace td {
@@ -85,7 +85,7 @@ void hmac_sha256(Slice key, Slice message, MutableSlice dest);
 
 // Interface may be improved
 Result<BufferSlice> rsa_encrypt_pkcs1_oaep(Slice public_key, Slice data);
-Result<BufferSlice> rsa_decrypt_pkcs1_oaep(Slice public_key, Slice data);
+Result<BufferSlice> rsa_decrypt_pkcs1_oaep(Slice private_key, Slice data);
 
 void init_openssl_threads();
 #endif
diff --git a/test/secure_storage.cpp b/test/secure_storage.cpp
index 912e5ca8..5fdcdb5b 100644
--- a/test/secure_storage.cpp
+++ b/test/secure_storage.cpp
@@ -29,20 +29,22 @@ TEST(SecureStorage, simple) {
   BufferSlice value("Small tale about cucumbers");
   auto value_secret = Secret::create_new();
 
-  auto value_view = BufferSliceDataView(value.copy());
-  BufferSlice prefix = gen_random_prefix(value_view.size());
-  auto prefix_view = BufferSliceDataView(std::move(prefix));
-  auto full_value_view = ConcatDataView(prefix_view, value_view);
-  auto hash = calc_value_hash(full_value_view).move_as_ok();
+  {
+    auto value_view = BufferSliceDataView(value.copy());
+    BufferSlice prefix = gen_random_prefix(value_view.size());
+    auto prefix_view = BufferSliceDataView(std::move(prefix));
+    auto full_value_view = ConcatDataView(prefix_view, value_view);
+    auto hash = calc_value_hash(full_value_view).move_as_ok();
 
-  Encryptor encryptor(calc_aes_cbc_state(PSLICE() << value_secret.as_slice() << hash.as_slice()), full_value_view);
-  auto encrypted_value = encryptor.pread(0, encryptor.size()).move_as_ok();
+    Encryptor encryptor(calc_aes_cbc_state(PSLICE() << value_secret.as_slice() << hash.as_slice()), full_value_view);
+    auto encrypted_value = encryptor.pread(0, encryptor.size()).move_as_ok();
 
-  Decryptor decryptor(calc_aes_cbc_state(PSLICE() << value_secret.as_slice() << hash.as_slice()));
-  auto res = decryptor.append(encrypted_value.copy()).move_as_ok();
-  auto decrypted_hash = decryptor.finish().ok();
-  ASSERT_TRUE(decrypted_hash.as_slice() == hash.as_slice());
-  ASSERT_TRUE(res.as_slice() == value.as_slice());
+    Decryptor decryptor(calc_aes_cbc_state(PSLICE() << value_secret.as_slice() << hash.as_slice()));
+    auto res = decryptor.append(encrypted_value.copy()).move_as_ok();
+    auto decrypted_hash = decryptor.finish().ok();
+    ASSERT_TRUE(decrypted_hash.as_slice() == hash.as_slice());
+    ASSERT_TRUE(res.as_slice() == value.as_slice());
+  }
 
   {
     auto encrypted_value = encrypt_value(value_secret, value.as_slice()).move_as_ok();