--- utils/drmprocessorclientimpl.cpp
+++ utils/drmprocessorclientimpl.cpp
@@ -411,7 +411,12 @@
     if (PKCS12_parse(pkcs12, password.c_str(), &pkey, NULL, NULL) <= 0)
         EXCEPTION(gourou::CLIENT_INVALID_PKCS12, ERR_error_string(ERR_get_error(), NULL));
 
-    outlen = EVP_PKEY_get_size(pkey);
+    /* outlen = EVP_PKEY_get_size(pkey); */
+    #if OPENSSL_VERSION_NUMBER < 0x30000000L
+        outlen = EVP_PKEY_size(pkey);
+    #else
+        outlen = EVP_PKEY_get_size(pkey);
+    #endif
 
     ctx = EVP_PKEY_CTX_new(pkey, NULL);
 
@@ -499,7 +504,12 @@
     if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_NO_PADDING) <= 0)
         EXCEPTION(gourou::CLIENT_RSA_ERROR, ERR_error_string(ERR_get_error(), NULL));
 
-    outlen = EVP_PKEY_get_size(pkey);
+    /* outlen = EVP_PKEY_get_size(pkey); */
+    #if OPENSSL_VERSION_NUMBER < 0x30000000L
+        outlen = EVP_PKEY_size(pkey);
+    #else
+        outlen = EVP_PKEY_get_size(pkey);
+    #endif
 
     tmp = (unsigned char*)malloc(outlen);
 
@@ -531,7 +541,12 @@
     EVP_PKEY_keygen_init(ctx);
 
     EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, keyLengthBits);
-    EVP_PKEY_CTX_set1_rsa_keygen_pubexp(ctx, bn);
+    /* EVP_PKEY_CTX_set1_rsa_keygen_pubexp(ctx, bn); */
+    #if OPENSSL_VERSION_NUMBER < 0x30000000L
+        EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, bn);
+    #else
+        EVP_PKEY_CTX_set1_rsa_keygen_pubexp(ctx, bn);
+    #endif
     EVP_PKEY_keygen(ctx, &key);
 
     EVP_PKEY_CTX_free(ctx);