From d06221c16e5e6c2d6def03cea92247080d09a539 Mon Sep 17 00:00:00 2001
From: JacobBarthelmeh <jacob@wolfssl.com>
Date: Thu, 13 Nov 2025 12:08:46 -0700
Subject: [PATCH 1/2] with decode enveloped data track total encrypted content
 size

---
 tests/api/test_pkcs7.c    | 3 ++-
 wolfcrypt/src/pkcs7.c     | 9 ++++++++-
 wolfssl/wolfcrypt/pkcs7.h | 1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/tests/api/test_pkcs7.c b/tests/api/test_pkcs7.c
index 662c94fb42..c110d27af6 100644
--- a/tests/api/test_pkcs7.c
+++ b/tests/api/test_pkcs7.c
@@ -2129,7 +2129,8 @@ int test_wc_PKCS7_DecodeEnvelopedData_stream(void)
     #ifdef NO_DES3
         ExpectIntEQ(ret, ALGO_ID_E);
     #else
-        ExpectIntGT(ret, 0);
+        /* expecting the size of ca-cert.pem */
+        ExpectIntEQ(ret, 5539);
     #endif
     }
 
diff --git a/wolfcrypt/src/pkcs7.c b/wolfcrypt/src/pkcs7.c
index 54cfe00c5d..15f0deb8b8 100644
--- a/wolfcrypt/src/pkcs7.c
+++ b/wolfcrypt/src/pkcs7.c
@@ -12493,6 +12493,7 @@ int wc_PKCS7_DecodeEnvelopedData(wc_PKCS7* pkcs7, byte* in,
             }
 
         #endif
+            pkcs7->totalEncryptedContentSz = 0;
             wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_ENV_5);
             FALL_THROUGH;
 
@@ -12628,6 +12629,10 @@ int wc_PKCS7_DecodeEnvelopedData(wc_PKCS7* pkcs7, byte* in,
                     /* advance idx past encrypted content */
                     localIdx += (word32)encryptedContentSz;
 
+                    /* keep track of total encrypted content size */
+                    pkcs7->totalEncryptedContentSz +=
+                        (word32)encryptedContentSz;
+
                     if (localIdx + ASN_INDEF_END_SZ <= pkiMsgSz) {
                         if (pkiMsg[localIdx] == ASN_EOC &&
                                 pkiMsg[localIdx+1] == ASN_EOC) {
@@ -12673,6 +12678,8 @@ int wc_PKCS7_DecodeEnvelopedData(wc_PKCS7* pkcs7, byte* in,
             } else {
                 pkcs7->cachedEncryptedContentSz =
                     (word32)encryptedContentTotalSz;
+                pkcs7->totalEncryptedContentSz =
+                    (word32)encryptedContentTotalSz;
                 pkcs7->cachedEncryptedContent = (byte*)XMALLOC(
                         pkcs7->cachedEncryptedContentSz, pkcs7->heap,
                     DYNAMIC_TYPE_PKCS7);
@@ -12734,7 +12741,7 @@ int wc_PKCS7_DecodeEnvelopedData(wc_PKCS7* pkcs7, byte* in,
                 pkcs7->cachedEncryptedContentSz = 0;
             }
 
-            ret = encryptedContentSz - padLen;
+            ret = pkcs7->totalEncryptedContentSz - padLen;
         #ifndef NO_PKCS7_STREAM
             pkcs7->stream->aad = NULL;
             pkcs7->stream->aadSz = 0;
diff --git a/wolfssl/wolfcrypt/pkcs7.h b/wolfssl/wolfcrypt/pkcs7.h
index b65c442c6c..834d17fa5c 100644
--- a/wolfssl/wolfcrypt/pkcs7.h
+++ b/wolfssl/wolfcrypt/pkcs7.h
@@ -349,6 +349,7 @@ struct wc_PKCS7 {
     /* used by DecodeEnvelopedData with multiple encrypted contents */
     byte*  cachedEncryptedContent;
     word32 cachedEncryptedContentSz;
+    word32 totalEncryptedContentSz; /* track encrypted content across octets */
     WC_BITFIELD contentCRLF:1; /* have content line endings been converted to CRLF */
     WC_BITFIELD contentIsPkcs7Type:1; /* eContent follows PKCS#7 RFC not CMS */
     WC_BITFIELD hashParamsAbsent:1;

From c63ca04228f92947070a76847798e27649a5cc4e Mon Sep 17 00:00:00 2001
From: JacobBarthelmeh <jacob@wolfssl.com>
Date: Thu, 13 Nov 2025 12:17:04 -0700
Subject: [PATCH 2/2] convert to type int for return value

---
 wolfcrypt/src/pkcs7.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wolfcrypt/src/pkcs7.c b/wolfcrypt/src/pkcs7.c
index 15f0deb8b8..c529a098dd 100644
--- a/wolfcrypt/src/pkcs7.c
+++ b/wolfcrypt/src/pkcs7.c
@@ -12741,7 +12741,7 @@ int wc_PKCS7_DecodeEnvelopedData(wc_PKCS7* pkcs7, byte* in,
                 pkcs7->cachedEncryptedContentSz = 0;
             }
 
-            ret = pkcs7->totalEncryptedContentSz - padLen;
+            ret = (int)pkcs7->totalEncryptedContentSz - padLen;
         #ifndef NO_PKCS7_STREAM
             pkcs7->stream->aad = NULL;
             pkcs7->stream->aadSz = 0;