From 0a8fdef7523ae796ca2e734c279791737148c001 Mon Sep 17 00:00:00 2001
From: Paul Yang <yang.yang@baishancloud.com>
Date: Tue, 4 Sep 2018 00:51:04 +0800
Subject: Support pmeth->digest_custom

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7113)
---
 crypto/evp/m_sigver.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'crypto/evp/m_sigver.c')

diff --git a/crypto/evp/m_sigver.c b/crypto/evp/m_sigver.c
index 2377944f66..4a0e5d5c55 100644
--- a/crypto/evp/m_sigver.c
+++ b/crypto/evp/m_sigver.c
@@ -75,6 +75,14 @@ static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
         return 1;
     if (!EVP_DigestInit_ex(ctx, type, e))
         return 0;
+    if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_DIGEST_CUSTOM) {
+        /*
+         * This indicates the current algorithm requires
+         * special treatment before hashing the tbs-message.
+         */
+        if (ctx->pctx->pmeth->digest_custom)
+            return ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx);
+    }
     return 1;
 }
 
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