Clean symbol export on mod mock

Merge from Widevine repo of http://go/wvgerrit/42281

This cleans up some of the oemcrypto mock code.  This code is only
used for testing.

bug: 72831885
bug: 69271232
Change-Id: I8add162839d6febe56a89df84e8ae0cf0b97a2d9

libwvdrmengine/oemcrypto/mock/src/oemcrypto_mock.cpp

@@ -115,7 +115,7 @@ extern "C" OEMCryptoResult OEMCrypto_OpenSession(OEMCrypto_SESSION* session) {
   SessionId sid = crypto_engine->CreateSession();
   *session = (OEMCrypto_SESSION)sid;
   if (LogCategoryEnabled(kLoggingTraceOEMCryptoCalls)) {
-    LOGD("[OEMCrypto_OpenSession(): SID=%08x]", sid);
+    LOGD("[OEMCrypto_OpenSession(): SID=%08X]", sid);
   }
   return OEMCrypto_SUCCESS;
 }
@@ -238,7 +238,7 @@ extern "C" OEMCryptoResult OEMCrypto_GenerateNonce(OEMCrypto_SESSION session,
   session_ctx->AddNonce(nonce_value);
   *nonce = nonce_value;
   if (LogCategoryEnabled(kLoggingTraceOEMCryptoCalls)) {
-    LOGI("nonce = %08x\n", nonce_value);
+    LOGI("nonce = %08X\n", nonce_value);
   }
   return OEMCrypto_SUCCESS;
 }

libwvdrmengine/oemcrypto/mock/src/oemcrypto_rsa_key_shared.cpp

@@ -14,20 +14,19 @@
 
 #include "oemcrypto_logging.h"
 
-namespace {
-
-void dump_openssl_error() {
-  while (unsigned long err = ERR_get_error()) {
-    char buffer[120];
-    LOGE("openssl error -- %lu -- %s",
-         err, ERR_error_string(err, buffer));
-  }
-}
-
-}  // namespace
-
 namespace wvoec_mock {
 
+void dump_boringssl_error() {
+  int count = 0;
+  while (unsigned long err = ERR_get_error()) {
+    count++;
+    char buffer[120];
+    ERR_error_string_n(err, buffer, sizeof(buffer));
+    LOGE("BoringSSL Error %d -- %lu -- %s", count, err, buffer);
+  }
+  LOGE("Reported %d BoringSSL Errors", count);
+}
+
 void RSA_shared_ptr::reset() {
   if (rsa_key_ && key_owned_) {
     RSA_free(rsa_key_);
@@ -52,6 +51,7 @@ bool RSA_shared_ptr::LoadPkcs8RsaKey(const uint8_t* buffer, size_t length) {
     pkcs8_pki = d2i_PKCS8_PRIV_KEY_INFO_bio(bio, NULL);
     if (pkcs8_pki == NULL) {
       LOGE("[LoadPkcs8RsaKey(): d2i_PKCS8_PRIV_KEY_INFO_bio returned NULL]");
+      dump_boringssl_error();
       success = false;
     }
   }
@@ -60,6 +60,7 @@ bool RSA_shared_ptr::LoadPkcs8RsaKey(const uint8_t* buffer, size_t length) {
     evp = EVP_PKCS82PKEY(pkcs8_pki);
     if (evp == NULL) {
       LOGE("[LoadPkcs8RsaKey(): EVP_PKCS82PKEY returned NULL]");
+      dump_boringssl_error();
       success = false;
     }
   }
@@ -86,11 +87,11 @@ bool RSA_shared_ptr::LoadPkcs8RsaKey(const uint8_t* buffer, size_t length) {
       return true;
     case 0:  // not valid.
       LOGE("[LoadPkcs8RsaKey(): rsa key not valid]");
-      dump_openssl_error();
+      dump_boringssl_error();
       return false;
     default:  // -1 == check failed.
       LOGE("[LoadPkcs8RsaKey(): error checking rsa key]");
-      dump_openssl_error();
+      dump_boringssl_error();
       return false;
   }
 }

libwvdrmengine/oemcrypto/mock/src/oemcrypto_rsa_key_shared.h

@@ -32,6 +32,9 @@ class RSA_shared_ptr {
   bool key_owned_;
 };
 
+// Log errors from BoringSSL.
+void dump_boringssl_error();
+
 }  // namespace wvoec_mock
 
 #endif  // OEMCRYPTO_RSA_KEY_SHARED_H_

libwvdrmengine/oemcrypto/mock/src/oemcrypto_session.cpp

@@ -43,15 +43,6 @@ void ctr128_inc64(uint8_t* counter) {
     if (++counter[--n] != 0) return;
   } while (n > 8);
 }
-
-void dump_boringssl_error() {
-  while (unsigned long err = ERR_get_error()) {
-    char buffer[120];
-    ERR_error_string_n(err, buffer, sizeof(buffer));
-    LOGE("BoringSSL Error -- %lu -- %s", err, buffer);
-  }
-}
-
 }  // namespace
 
 namespace wvoec_mock {