Merge #17265: Remove OpenSSL

e5a0bece6e84402fcb1fe4f25fd24da1d21ec077 doc: add OpenSSL removal to release-notes.md (fanquake)
397dbae070dca9a635ff3d1d61add09db004661e ci: remove OpenSSL installation (fanquake)
a4eb83961965347792e9ac75928aae359d5f7405 doc: remove OpenSSL from build instructions and licensing info (fanquake)
648b2e3c3288ee0b83d4089d27fa7f84a73d118e depends: remove OpenSSL package (fanquake)
8983ee3e6dd8ab658bd2caf97c326cc53ea50818 build: remove OpenSSL detection and libs (fanquake)
b49b6b0f7090cc15860d815fb0ef306ddfc718ba random: Remove remaining OpenSSL calls and locking infrastructure (fanquake)
4fcfcc294e7cb17956e283d09050cb997093a35d random: stop retrieving random bytes from OpenSSL (fanquake)
5624ab0b4f844dc7c17aeb1b009f002c33c38fb3 random: stop feeding RNG output back into OpenSSL (fanquake)

Pull request description:

  Now that #17165 has been merged, removing our remaining OpenSSL usage is possible.

  That remaining usage was a call to [`RAND_bytes`](https://www.openssl.org/docs/manmaster/man3/RAND_bytes.html) during the ::SLOW path of [ProcRand](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L616). As well as feeding output from our RNG back into OpenSSL via [`RAND_add`](https://www.openssl.org/docs/manmaster/man3/RAND_add.html) during the ::SLOW and ::SLEEP paths.

  Optimistically tagged for `0.20.0`. Needs discussion, potentially in an upcoming weekly meeting?

  Closes #12530.

ACKs for top commit:
  MarcoFalke:
    ACK e5a0bece6e84402fcb1fe4f25fd24da1d21ec077
  laanwj:
    ACK e5a0bece6e84402fcb1fe4f25fd24da1d21ec077

Tree-SHA512: 02fce08ec91d20e0da51e9314eec53dcf8699cded02f0a005417d627520c20b826332cb42bdae132af283d4903aa3088a9f613f3aea915d655a51532a4d4796c

11 files changed, 9 insertions, 26 deletions

diff --git a/doc/README.md b/doc/README.md
index d3017de2ab..46b311b251 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -84,5 +84,3 @@ The Bitcoin repo's [root README](/README.md) contains relevant information on th
 License
 ---------------------
 Distributed under the [MIT software license](/COPYING).
-This product includes software developed by the OpenSSL Project for use in the [OpenSSL Toolkit](https://www.openssl.org/). This product includes
-cryptographic software written by Eric Young ([eay@cryptsoft.com](mailto:eay@cryptsoft.com)), and UPnP software written by Thomas Bernard.
diff --git a/doc/build-freebsd.md b/doc/build-freebsd.md
index d22b6e8383..4831623504 100644
--- a/doc/build-freebsd.md
+++ b/doc/build-freebsd.md
@@ -11,7 +11,7 @@ This guide does not contain instructions for building the GUI.
 You will need the following dependencies, which can be installed as root via pkg:
 
 ```shell
-pkg install autoconf automake boost-libs git gmake libevent libtool openssl pkgconf
+pkg install autoconf automake boost-libs git gmake libevent libtool pkgconf
 
 git clone https://github.com/bitcoin/bitcoin.git
 ```
diff --git a/doc/build-osx.md b/doc/build-osx.md
index 9942449bf6..e435798e95 100644
--- a/doc/build-osx.md
+++ b/doc/build-osx.md
@@ -19,7 +19,7 @@ Then install [Homebrew](https://brew.sh).
 
 ## Dependencies
 ```shell
-brew install automake berkeley-db4 libtool boost miniupnpc openssl pkg-config python qt libevent qrencode
+brew install automake berkeley-db4 libtool boost miniupnpc pkg-config python qt libevent qrencode
 ```
 
 See [dependencies.md](dependencies.md) for a complete overview.
diff --git a/doc/build-unix.md b/doc/build-unix.md
index d048bdeff5..10c557569c 100644
--- a/doc/build-unix.md
+++ b/doc/build-unix.md
@@ -127,7 +127,7 @@ built by default.
 
 Build requirements:
 
-    sudo dnf install gcc-c++ libtool make autoconf automake openssl-devel libevent-devel boost-devel libdb4-devel libdb4-cxx-devel python3
+    sudo dnf install gcc-c++ libtool make autoconf automake libevent-devel boost-devel libdb4-devel libdb4-cxx-devel python3
 
 Optional (see `--with-miniupnpc` and `--enable-upnp-default`):
 
diff --git a/doc/dependencies.md b/doc/dependencies.md
index dc88626761..bfb663866d 100644
--- a/doc/dependencies.md
+++ b/doc/dependencies.md
@@ -17,7 +17,6 @@ These are the dependencies currently used by Bitcoin Core. You can find instruct
 | libpng |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
 | librsvg | |  |  |  |  |
 | MiniUPnPc | [2.0.20180203](http://miniupnp.free.fr/files) |  | No |  |  |
-| OpenSSL | [1.0.1k](https://www.openssl.org/source) |  | Yes |  |  |
 | PCRE |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
 | Python (tests) |  | [3.5](https://www.python.org/downloads) |  |  |  |
 | qrencode | [3.4.4](https://fukuchi.org/works/qrencode) |  | No |  |  |
diff --git a/doc/man/bitcoin-cli.1 b/doc/man/bitcoin-cli.1
index 95c1d24dff..129651d8e9 100644
--- a/doc/man/bitcoin-cli.1
+++ b/doc/man/bitcoin-cli.1
@@ -113,7 +113,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/man/bitcoin-qt.1 b/doc/man/bitcoin-qt.1
index 1957fb736e..f68be21e8d 100644
--- a/doc/man/bitcoin-qt.1
+++ b/doc/man/bitcoin-qt.1
@@ -608,7 +608,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/man/bitcoin-tx.1 b/doc/man/bitcoin-tx.1
index 6b6071d9b7..b4c7698896 100644
--- a/doc/man/bitcoin-tx.1
+++ b/doc/man/bitcoin-tx.1
@@ -114,7 +114,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/man/bitcoin-wallet.1 b/doc/man/bitcoin-wallet.1
index 1cb8cdebcd..aadea09a2b 100644
--- a/doc/man/bitcoin-wallet.1
+++ b/doc/man/bitcoin-wallet.1
@@ -61,7 +61,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/man/bitcoind.1 b/doc/man/bitcoind.1
index b0aff99ca2..211ba10285 100644
--- a/doc/man/bitcoind.1
+++ b/doc/man/bitcoind.1
@@ -581,7 +581,3 @@ The source code is available from <https://github.com/bitcoin/bitcoin>.
 This is experimental software.
 Distributed under the MIT software license, see the accompanying file COPYING
 or <https://opensource.org/licenses/MIT>
-
-This product includes software developed by the OpenSSL Project for use in the
-OpenSSL Toolkit <https://www.openssl.org> and cryptographic software written by
-Eric Young and UPnP software written by Thomas Bernard.
diff --git a/doc/release-notes.md b/doc/release-notes.md
index a47c8802b0..33a127e0d0 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -63,6 +63,12 @@ distribution provides binaries for the RISC-V platform.
 Notable changes
 ===============
 
+Build System
+------------
+
+- OpenSSL is no longer used by Bitcoin Core. The last usage of the library
+was removed in #17265.
+
 New RPCs
 --------