Implement DLEQ checks for Trust Token.

Change-Id: I6f263b775aafad6616b31af59096c3b4229fe3e1
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/40684
Commit-Queue: Steven Valdez <svaldez@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/include/openssl/trust_token.h b/include/openssl/trust_token.h
index 473999d..8bd1eda 100644
--- a/include/openssl/trust_token.h
+++ b/include/openssl/trust_token.h
@@ -273,5 +273,6 @@
 #define TRUST_TOKEN_R_BAD_VALIDITY_CHECK 111
 #define TRUST_TOKEN_R_NO_SRR_KEY_CONFIGURED 112
 #define TRUST_TOKEN_R_INVALID_METADATA_KEY 113
+#define TRUST_TOKEN_R_INVALID_PROOF 114
 
 #endif  // OPENSSL_HEADER_TRUST_TOKEN_H