diff --git a/quic/core/crypto/quic_crypto_client_config.cc b/quic/core/crypto/quic_crypto_client_config.cc
index 06dd8b6..7f8edc2 100644
--- a/quic/core/crypto/quic_crypto_client_config.cc
+++ b/quic/core/crypto/quic_crypto_client_config.cc
@@ -859,6 +859,15 @@
   return session_cache_.get();
 }
 
+ProofSource* QuicCryptoClientConfig::proof_source() const {
+  return proof_source_.get();
+}
+
+void QuicCryptoClientConfig::set_proof_source(
+    std::unique_ptr<ProofSource> proof_source) {
+  proof_source_ = std::move(proof_source);
+}
+
 SSL_CTX* QuicCryptoClientConfig::ssl_ctx() const {
   return ssl_ctx_.get();
 }
diff --git a/quic/core/crypto/quic_crypto_client_config.h b/quic/core/crypto/quic_crypto_client_config.h
index fa96902..e4f7061 100644
--- a/quic/core/crypto/quic_crypto_client_config.h
+++ b/quic/core/crypto/quic_crypto_client_config.h
@@ -15,6 +15,7 @@
 #include "third_party/boringssl/src/include/openssl/ssl.h"
 #include "net/third_party/quiche/src/quic/core/crypto/crypto_handshake.h"
 #include "net/third_party/quiche/src/quic/core/crypto/crypto_protocol.h"
+#include "net/third_party/quiche/src/quic/core/crypto/proof_source.h"
 #include "net/third_party/quiche/src/quic/core/crypto/transport_parameters.h"
 #include "net/third_party/quiche/src/quic/core/quic_packets.h"
 #include "net/third_party/quiche/src/quic/core/quic_server_id.h"
@@ -362,6 +363,8 @@
 
   ProofVerifier* proof_verifier() const;
   SessionCache* session_cache() const;
+  ProofSource* proof_source() const;
+  void set_proof_source(std::unique_ptr<ProofSource> proof_source);
   SSL_CTX* ssl_ctx() const;
 
   // Initialize the CachedState from |canonical_crypto_config| for the
@@ -441,6 +444,7 @@
 
   std::unique_ptr<ProofVerifier> proof_verifier_;
   std::unique_ptr<SessionCache> session_cache_;
+  std::unique_ptr<ProofSource> proof_source_;
   bssl::UniquePtr<SSL_CTX> ssl_ctx_;
 
   // The |user_agent_id_| passed in QUIC's CHLO message.