diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index dbe3234..8c7520f 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -1134,7 +1134,7 @@
 # PKCS7 test data
 pkcs7_test_cert_1 = pkcs7-rsa-sha256-1.crt
 pkcs7_test_cert_2 = pkcs7-rsa-sha256-2.crt
-pkcs7_test_file = pkcs7_data.txt
+pkcs7_test_file = pkcs7_data.bin
 
 # Generate signing cert
 pkcs7-rsa-sha256-1.crt:
@@ -1147,46 +1147,34 @@
 	cat pkcs7-rsa-sha256-2.crt pkcs7-rsa-sha256-2.key > pkcs7-rsa-sha256-2.pem
 all_final += pkcs7-rsa-sha256-2.crt
 
-# Generate data file to be signed
-pkcs7_data.txt:
-	echo "Hello" > $@
-	echo 2 >> pkcs7_data_1.txt
-all_final += pkcs7_data.txt
-
-# Generate another data file to check hash mismatch during certificate verification
-pkcs7_data_1.txt: $(pkcs7_test_file)
-	cat $(pkcs7_test_file) > $@
-	echo 2 >> $@
-all_final += pkcs7_data_1.txt
-
 # pkcs7 signature file with CERT
 pkcs7_data_cert_signed_sha256.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
-	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -noattr -outform DER -out $@
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.bin -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -noattr -outform DER -out $@
 all_final += pkcs7_data_cert_signed_sha256.der
 
 # pkcs7 signature file with CERT and sha1
 pkcs7_data_cert_signed_sha1.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
-	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha1 -signer pkcs7-rsa-sha256-1.pem -noattr -outform DER -out $@
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.bin -out $@ -md sha1 -signer pkcs7-rsa-sha256-1.pem -noattr -outform DER -out $@
 all_final += pkcs7_data_cert_signed_sha1.der
 
 # pkcs7 signature file with CERT and sha512
 pkcs7_data_cert_signed_sha512.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
-	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha512 -signer pkcs7-rsa-sha256-1.pem -noattr -outform DER -out $@
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.bin -out $@ -md sha512 -signer pkcs7-rsa-sha256-1.pem -noattr -outform DER -out $@
 all_final += pkcs7_data_cert_signed_sha512.der
 
 # pkcs7 signature file without CERT
 pkcs7_data_without_cert_signed.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
-	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -nocerts -noattr -outform DER -out $@
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.bin -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -nocerts -noattr -outform DER -out $@
 all_final += pkcs7_data_without_cert_signed.der
 
 # pkcs7 signature file with multiple signers
 pkcs7_data_multiple_signed.der: $(pkcs7_test_file) $(pkcs7_test_cert_1) $(pkcs7_test_cert_2)
-	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -signer pkcs7-rsa-sha256-2.pem -nocerts -noattr -outform DER -out $@
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.bin -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -signer pkcs7-rsa-sha256-2.pem -nocerts -noattr -outform DER -out $@
 all_final += pkcs7_data_multiple_signed.der
 
 # pkcs7 signature file with multiple certificates
 pkcs7_data_multiple_certs_signed.der: $(pkcs7_test_file) $(pkcs7_test_cert_1) $(pkcs7_test_cert_2)
-	$(OPENSSL) smime -sign -binary -in pkcs7_data.txt -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -signer pkcs7-rsa-sha256-2.pem -noattr -outform DER -out $@
+	$(OPENSSL) smime -sign -binary -in pkcs7_data.bin -out $@ -md sha256 -signer pkcs7-rsa-sha256-1.pem -signer pkcs7-rsa-sha256-2.pem -noattr -outform DER -out $@
 all_final += pkcs7_data_multiple_certs_signed.der
 
 # pkcs7 signature file with corrupted CERT
@@ -1208,7 +1196,7 @@
 all_final += pkcs7_data_cert_signed_v2.der
 
 pkcs7_data_cert_encrypted.der: $(pkcs7_test_file) $(pkcs7_test_cert_1)
-	$(OPENSSL) smime -encrypt -aes256 -in pkcs7_data.txt -binary -outform DER -out $@ pkcs7-rsa-sha256-1.crt
+	$(OPENSSL) smime -encrypt -aes256 -in pkcs7_data.bin -binary -outform DER -out $@ pkcs7-rsa-sha256-1.crt
 all_final += pkcs7_data_cert_encrypted.der
 
 ## Negative tests
diff --git a/tests/data_files/pkcs7_data.txt b/tests/data_files/pkcs7_data.bin
similarity index 100%
rename from tests/data_files/pkcs7_data.txt
rename to tests/data_files/pkcs7_data.bin
diff --git a/tests/data_files/pkcs7_data_1.txt b/tests/data_files/pkcs7_data_1.bin
similarity index 100%
rename from tests/data_files/pkcs7_data_1.txt
rename to tests/data_files/pkcs7_data_1.bin