Blame SOURCES/0008-Require-OpenSSL-1.1.0.patch

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From 090a10a69340dc0825f611eceac60bf3f904a5ec Mon Sep 17 00:00:00 2001
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From: Petr Gotthard <petr.gotthard@centrum.cz>
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Date: Sat, 17 Jul 2021 22:43:00 +0200
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Subject: Require OpenSSL >= 1.1.0
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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To reduce the amount of version-specific code we drop support for
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OpenSSL prior 1.1.0, including all forks such as LibreSSL, which are
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not API compatible with OpenSSL >= 1.1.0.
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Python 3.10 will even require OpenSSL >= 1.1.1. The corresponding
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PEP 644 contains a detailed impact analysis which is also relevant
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here.
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Signed-off-by: Petr Gotthard <petr.gotthard@centrum.cz>
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---
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 INSTALL.md   | 3 +--
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 configure.ac | 6 +++++-
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 2 files changed, 6 insertions(+), 3 deletions(-)
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diff --git a/INSTALL.md b/INSTALL.md
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index eec94c45..658e1f28 100644
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--- a/INSTALL.md
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+++ b/INSTALL.md
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@@ -14,7 +14,7 @@ following sections describe them for the supported platforms.
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 * C library development libraries and header files
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 * pkg-config
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 * doxygen
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-* OpenSSL development libraries and header files
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+* OpenSSL development libraries and header files, version >= 1.1.0
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 * libcurl development libraries
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 The following are dependencies only required when building test suites.
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@@ -71,7 +71,6 @@ C Runtime (UCRT) version 10.0.16299.0. Building the type marshaling library
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 (tss2-mu.dll) and the system API (tss2-sapi.dll) should be as simple as
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 loading the tpm2-tss solution (tpm2-tss.sln) with a compatible and properly
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 configured version of Visual Studio 2017 and pressing the 'build' button.
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-Windows build setup requires OpenSSL >= v1.0.2 crypto library.
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 ### References
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 Visual Studio 2017 with "Clang for Windows": https://blogs.msdn.microsoft.com/vcblog/2017/03/07/use-any-c-compiler-with-visual-studio/
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diff --git a/configure.ac b/configure.ac
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index d4324c9a..12baa257 100755
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--- a/configure.ac
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+++ b/configure.ac
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@@ -132,9 +132,13 @@ AC_ARG_WITH([crypto],
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 AM_CONDITIONAL(ESYS_OSSL, test "x$with_crypto" = "xossl")
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 AM_CONDITIONAL(ESYS_MBED, test "x$with_crypto" = "xmbed")
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+m4_define([ossl_min_version], [1.1.0])
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+m4_define([ossl_err], [OpenSSL libcrypto is missing or version requirements not met. OpenSSL version must be >= ossl_min_version])
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 AS_IF([test "x$enable_esys" = xyes],
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       [AS_IF([test "x$with_crypto" = xossl], [
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-           PKG_CHECK_MODULES([LIBCRYPTO], [libcrypto])
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+           PKG_CHECK_MODULES([LIBCRYPTO],
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+                             [libcrypto >= ossl_min_version],,
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+                             [AC_MSG_ERROR([ossl_err])])
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            AC_DEFINE([OSSL], [1], [OpenSSL cryptographic backend])
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            TSS2_ESYS_CFLAGS_CRYPTO="$LIBCRYPTO_CFLAGS"
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            TSS2_ESYS_LDFLAGS_CRYPTO="$LIBCRYPTO_LIBS"
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-- 
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2.26.3
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