doc: Use https URLs where possible

14 files changed, 19 insertions, 19 deletions

diff --git a/doc/developer-notes.md b/doc/developer-notes.md
index e53fc1d9d6..596f65cf10 100644
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -135,7 +135,7 @@ Refer to [/test/functional/README.md#style-guidelines](/test/functional/README.m
 Coding Style (Doxygen-compatible comments)
 ------------------------------------------
 
-Bitcoin Core uses [Doxygen](http://www.doxygen.nl/) to generate its official documentation.
+Bitcoin Core uses [Doxygen](https://www.doxygen.nl/) to generate its official documentation.
 
 Use Doxygen-compatible comment blocks for functions, methods, and fields.
 
@@ -156,7 +156,7 @@ For example, to describe a function use:
 bool function(int arg1, const char *arg2, std::string& arg3)
 ```
 
-A complete list of `@xxx` commands can be found at http://www.doxygen.nl/manual/commands.html.
+A complete list of `@xxx` commands can be found at https://www.doxygen.nl/manual/commands.html.
 As Doxygen recognizes the comments by the delimiters (`/**` and `*/` in this case), you don't
 *need* to provide any commands for a comment to be valid; just a description text is fine.
 
@@ -203,7 +203,7 @@ Also not picked up by Doxygen:
  */
 ```
 
-A full list of comment syntaxes picked up by Doxygen can be found at http://www.doxygen.nl/manual/docblocks.html,
+A full list of comment syntaxes picked up by Doxygen can be found at https://www.doxygen.nl/manual/docblocks.html,
 but the above styles are favored.
 
 Recommendations:
@@ -216,7 +216,7 @@ Recommendations:
 
 - Backticks aren't required when referring to functions Doxygen already knows
   about; it will build hyperlinks for these automatically. See
-  http://www.doxygen.nl/manual/autolink.html for complete info.
+  https://www.doxygen.nl/manual/autolink.html for complete info.
 
 - Avoid linking to external documentation; links can break.
 
diff --git a/src/crypto/chacha_poly_aead.h b/src/crypto/chacha_poly_aead.h
index b3ba781cdd..0afe8fcc14 100644
--- a/src/crypto/chacha_poly_aead.h
+++ b/src/crypto/chacha_poly_aead.h
@@ -17,12 +17,12 @@ static constexpr int AAD_PACKAGES_PER_ROUND = 21;        /* 64 / 3 round down*/
 /* A AEAD class for ChaCha20-Poly1305@bitcoin.
  *
  * ChaCha20 is a stream cipher designed by Daniel Bernstein and described in
- * <ref>[http://cr.yp.to/chacha/chacha-20080128.pdf ChaCha20]</ref>. It operates
+ * <ref>[https://cr.yp.to/chacha/chacha-20080128.pdf ChaCha20]</ref>. It operates
  * by permuting 128 fixed bits, 128 or 256 bits of key, a 64 bit nonce and a 64
  * bit counter into 64 bytes of output. This output is used as a keystream, with
  * any unused bytes simply discarded.
  *
- * Poly1305 <ref>[http://cr.yp.to/mac/poly1305-20050329.pdf Poly1305]</ref>, also
+ * Poly1305 <ref>[https://cr.yp.to/mac/poly1305-20050329.pdf Poly1305]</ref>, also
  * by Daniel Bernstein, is a one-time Carter-Wegman MAC that computes a 128 bit
  * integrity tag given a message and a single-use 256 bit secret key.
  *
diff --git a/src/crypto/sha256_sse4.cpp b/src/crypto/sha256_sse4.cpp
index 89f529a3ab..143752c7cf 100644
--- a/src/crypto/sha256_sse4.cpp
+++ b/src/crypto/sha256_sse4.cpp
@@ -1001,7 +1001,7 @@ void Transform(uint32_t* s, const unsigned char* chunk, size_t blocks)
 ; This code is described in an Intel White-Paper:
 ; "Fast SHA-256 Implementations on Intel Architecture Processors"
 ;
-; To find it, surf to http://www.intel.com/p/en_US/embedded 
+; To find it, surf to https://www.intel.com/p/en_US/embedded
 ; and search for that title.
 ; The paper is expected to be released roughly at the end of April, 2012
 ;
diff --git a/src/cuckoocache.h b/src/cuckoocache.h
index 2daf676c4a..1166466771 100644
--- a/src/cuckoocache.h
+++ b/src/cuckoocache.h
@@ -225,7 +225,7 @@ private:
      *  [0, 1) and simply multiply it by the size. Then we just shift the result down by
      *  32-bits to get our bucket number. The result has non-uniformity the same as a
      *  mod, but it is much faster to compute. More about this technique can be found at
-     *  http://lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/ .
+     *  https://lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/ .
      *
      * The resulting non-uniformity is also more equally distributed which would be
      *  advantageous for something like linear probing, though it shouldn't matter
diff --git a/src/hash.cpp b/src/hash.cpp
index af6101a226..cc46043c2b 100644
--- a/src/hash.cpp
+++ b/src/hash.cpp
@@ -15,7 +15,7 @@ inline uint32_t ROTL32(uint32_t x, int8_t r)
 
 unsigned int MurmurHash3(unsigned int nHashSeed, Span<const unsigned char> vDataToHash)
 {
-    // The following is MurmurHash3 (x86_32), see http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp
+    // The following is MurmurHash3 (x86_32), see https://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp
     uint32_t h1 = nHashSeed;
     const uint32_t c1 = 0xcc9e2d51;
     const uint32_t c2 = 0x1b873593;
diff --git a/src/key.cpp b/src/key.cpp
index 1ed5c1bea3..1e59b301cb 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -18,7 +18,7 @@ static secp256k1_context* secp256k1_context_sign = nullptr;
 
 /**
  * This parses a format loosely based on a DER encoding of the ECPrivateKey type from
- * section C.4 of SEC 1 <http://www.secg.org/sec1-v2.pdf>, with the following caveats:
+ * section C.4 of SEC 1 <https://www.secg.org/sec1-v2.pdf>, with the following caveats:
  *
  * * The octet-length of the SEQUENCE must be encoded as 1 or 2 octets. It is not
  *   required to be encoded as one octet if it is less than 256, as DER would require.
@@ -80,7 +80,7 @@ int ec_seckey_import_der(const secp256k1_context* ctx, unsigned char *out32, con
 
 /**
  * This serializes to a DER encoding of the ECPrivateKey type from section C.4 of SEC 1
- * <http://www.secg.org/sec1-v2.pdf>. The optional parameters and publicKey fields are
+ * <https://www.secg.org/sec1-v2.pdf>. The optional parameters and publicKey fields are
  * included.
  *
  * seckey must point to an output buffer of length at least CKey::SIZE bytes.
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 4e1b239bc7..8efb0e35d0 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -77,7 +77,7 @@ static void RegisterMetaTypes()
   #ifdef ENABLE_WALLET
     qRegisterMetaType<WalletModel*>();
   #endif
-    // Register typedefs (see http://qt-project.org/doc/qt-5/qmetatype.html#qRegisterMetaType)
+    // Register typedefs (see https://doc.qt.io/qt-5/qmetatype.html#qRegisterMetaType)
     // IMPORTANT: if CAmount is no longer a typedef use the normal variant above (see https://doc.qt.io/qt-5/qmetatype.html#qRegisterMetaType-1)
     qRegisterMetaType<CAmount>("CAmount");
     qRegisterMetaType<size_t>("size_t");
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index 88249c4e2e..8205b0506c 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -655,7 +655,7 @@ bool SetStartOnSystemStartup(bool fAutoStart)
 #elif defined(Q_OS_LINUX)
 
 // Follow the Desktop Application Autostart Spec:
-// http://standards.freedesktop.org/autostart-spec/autostart-spec-latest.html
+// https://specifications.freedesktop.org/autostart-spec/autostart-spec-latest.html
 
 fs::path static GetAutostartDir()
 {
diff --git a/src/qt/notificator.cpp b/src/qt/notificator.cpp
index 1242a96991..b097ef080c 100644
--- a/src/qt/notificator.cpp
+++ b/src/qt/notificator.cpp
@@ -66,7 +66,7 @@ Notificator::~Notificator()
 
 #ifdef USE_DBUS
 
-// Loosely based on http://www.qtcentre.org/archive/index.php/t-25879.html
+// Loosely based on https://www.qtcentre.org/archive/index.php/t-25879.html
 class FreedesktopImage
 {
 public:
diff --git a/src/support/lockedpool.cpp b/src/support/lockedpool.cpp
index 26de780f29..6965f40253 100644
--- a/src/support/lockedpool.cpp
+++ b/src/support/lockedpool.cpp
@@ -65,7 +65,7 @@ void* Arena::alloc(size_t size)
 
     // Pick a large enough free-chunk. Returns an iterator pointing to the first element that is not less than key.
     // This allocation strategy is best-fit. According to "Dynamic Storage Allocation: A Survey and Critical Review",
-    // Wilson et. al. 1995, http://www.scs.stanford.edu/14wi-cs140/sched/readings/wilson.pdf, best-fit and first-fit
+    // Wilson et. al. 1995, https://www.scs.stanford.edu/14wi-cs140/sched/readings/wilson.pdf, best-fit and first-fit
     // policies seem to work well in practice.
     auto size_ptr_it = size_to_free_chunk.lower_bound(size);
     if (size_ptr_it == size_to_free_chunk.end())
diff --git a/src/util/strencodings.h b/src/util/strencodings.h
index 8ee43c620b..b4a61202ef 100644
--- a/src/util/strencodings.h
+++ b/src/util/strencodings.h
@@ -166,7 +166,7 @@ bool TimingResistantEqual(const T& a, const T& b)
 }
 
 /** Parse number as fixed point according to JSON number syntax.
- * See http://json.org/number.gif
+ * See https://json.org/number.gif
  * @returns true on success, false on error.
  * @note The result must be in the range (-10^18,10^18), otherwise an overflow error will trigger.
  */
diff --git a/src/wallet/test/coinselector_tests.cpp b/src/wallet/test/coinselector_tests.cpp
index 019161415c..202804c9ff 100644
--- a/src/wallet/test/coinselector_tests.cpp
+++ b/src/wallet/test/coinselector_tests.cpp
@@ -453,7 +453,7 @@ BOOST_AUTO_TEST_CASE(knapsack_solver_test)
         BOOST_CHECK( testWallet.SelectCoinsMinConf(1 * MIN_CHANGE, filter_confirmed, GroupCoins(vCoins), setCoinsRet, nValueRet, coin_selection_params, bnb_used));
         BOOST_CHECK_EQUAL(nValueRet, 1 * MIN_CHANGE); // we should get the exact amount
 
-        // run the 'mtgox' test (see http://blockexplorer.com/tx/29a3efd3ef04f9153d47a990bd7b048a4b2d213daaa5fb8ed670fb85f13bdbcf)
+        // run the 'mtgox' test (see https://blockexplorer.com/tx/29a3efd3ef04f9153d47a990bd7b048a4b2d213daaa5fb8ed670fb85f13bdbcf)
         // they tried to consolidate 10 50k coins into one 500k coin, and ended up with 50k in change
         empty_wallet();
         for (int j = 0; j < 20; j++)
diff --git a/test/functional/test_framework/key.py b/test/functional/test_framework/key.py
index f3d13c049b..e0cbab45ce 100644
--- a/test/functional/test_framework/key.py
+++ b/test/functional/test_framework/key.py
@@ -27,7 +27,7 @@ def xor_bytes(b0, b1):
 def jacobi_symbol(n, k):
     """Compute the Jacobi symbol of n modulo k
 
-    See http://en.wikipedia.org/wiki/Jacobi_symbol
+    See https://en.wikipedia.org/wiki/Jacobi_symbol
 
     For our application k is always prime, so this is the same as the Legendre symbol."""
     assert k > 0 and k & 1, "jacobi symbol is only defined for positive odd k"
diff --git a/test/functional/test_framework/netutil.py b/test/functional/test_framework/netutil.py
index c98424e8e2..e047e7fa14 100644
--- a/test/functional/test_framework/netutil.py
+++ b/test/functional/test_framework/netutil.py
@@ -84,7 +84,7 @@ def get_bind_addrs(pid):
             bind_addrs.append(conn[1])
     return bind_addrs
 
-# from: http://code.activestate.com/recipes/439093/
+# from: https://code.activestate.com/recipes/439093/
 def all_interfaces():
     '''
     Return all interfaces that are up