1 files changed, 5 insertions, 5 deletions
diff --git a/src/qt/paymentrequestplus.cpp b/src/qt/paymentrequestplus.cpp
index 01ec416613..897762b1a7 100644
--- a/src/qt/paymentrequestplus.cpp
+++ b/src/qt/paymentrequestplus.cpp
@@ -66,7 +66,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
 
     // One day we'll support more PKI types, but just
     // x509 for now:
-    const EVP_MD* digestAlgorithm = NULL;
+    const EVP_MD* digestAlgorithm = nullptr;
     if (paymentRequest.pki_type() == "x509+sha256") {
         digestAlgorithm = EVP_sha256();
     }
@@ -104,7 +104,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
         }
 #endif
         const unsigned char *data = (const unsigned char *)certChain.certificate(i).data();
-        X509 *cert = d2i_X509(NULL, &data, certChain.certificate(i).size());
+        X509 *cert = d2i_X509(nullptr, &data, certChain.certificate(i).size());
         if (cert)
             certs.push_back(cert);
     }
@@ -129,7 +129,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
         return false;
     }
 
-    char *website = NULL;
+    char *website = nullptr;
     bool fResult = true;
     try
     {
@@ -169,7 +169,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
 #endif
         EVP_PKEY *pubkey = X509_get_pubkey(signing_cert);
         EVP_MD_CTX_init(ctx);
-        if (!EVP_VerifyInit_ex(ctx, digestAlgorithm, NULL) ||
+        if (!EVP_VerifyInit_ex(ctx, digestAlgorithm, nullptr) ||
             !EVP_VerifyUpdate(ctx, data_to_verify.data(), data_to_verify.size()) ||
             !EVP_VerifyFinal(ctx, (const unsigned char*)paymentRequest.signature().data(), (unsigned int)paymentRequest.signature().size(), pubkey)) {
             throw SSLVerifyError("Bad signature, invalid payment request.");
@@ -179,7 +179,7 @@ bool PaymentRequestPlus::getMerchant(X509_STORE* certStore, QString& merchant) c
 #endif
 
         // OpenSSL API for getting human printable strings from certs is baroque.
-        int textlen = X509_NAME_get_text_by_NID(certname, NID_commonName, NULL, 0);
+        int textlen = X509_NAME_get_text_by_NID(certname, NID_commonName, nullptr, 0);
         website = new char[textlen + 1];
         if (X509_NAME_get_text_by_NID(certname, NID_commonName, website, textlen + 1) == textlen && textlen > 0) {
             merchant = website;