Pulled PR softhsm#583 for more RSA OAEP algorithms support

Author: Antoine Lochet

README.md

@@ -37,7 +37,7 @@ SoftHSM depends on a cryptographic library, Botan or OpenSSL.
 Minimum required versions:
 
 - Botan 2.0.0
-- OpenSSL 1.0.0
+- OpenSSL 1.0.2
 
 If you are using Botan, use at least version 2.6.0. This will improve
 the performance when doing public key operations.

m4/acx_crypto_backend.m4

@@ -75,9 +75,11 @@ AC_DEFUN([ACX_CRYPTO_BACKEND],[
 		AC_MSG_RESULT(OpenSSL)
 
 		if test "x${enable_fips}" = "xyes"; then
-			ACX_OPENSSL(1,0,1)
+			# needed for FIPS compliance, so change only when FIPS requirements change
+			ACX_OPENSSL(1,0,2)
 		else
-			ACX_OPENSSL(1,0,0)
+			# increase this as features from newer versions needed
+			ACX_OPENSSL(1,0,2)
 		fi
 
 		CRYPTO_INCLUDES=$OPENSSL_INCLUDES