From 53831d0f32273294925c82b6977d250409a9acc1 Mon Sep 17 00:00:00 2001
From: Eric Blankenhorn <eric@wolfssl.com>
Date: Fri, 10 Jan 2025 10:06:14 -0600
Subject: [PATCH] Add test

---
 tests/api.c         | 6 ++++++
 wolfcrypt/src/asn.c | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/tests/api.c b/tests/api.c
index 0ad5c086cc..55dd895c1b 100644
--- a/tests/api.c
+++ b/tests/api.c
@@ -26492,6 +26492,7 @@ static int test_wc_ecc_rs_to_sig(void)
     byte        s[KEY24];
     word32      rlen = (word32)sizeof(r);
     word32      slen = (word32)sizeof(s);
+    word32      zeroLen = 0;
 
     /* Init stack variables. */
     XMEMSET(sig, 0, ECC_MAX_SIG_SIZE);
@@ -26517,6 +26518,11 @@ static int test_wc_ecc_rs_to_sig(void)
         WC_NO_ERR_TRACE(ECC_BAD_ARG_E));
     ExpectIntEQ(wc_ecc_sig_to_rs(sig, siglen, r, &rlen, s, NULL),
         WC_NO_ERR_TRACE(ECC_BAD_ARG_E));
+    ExpectIntEQ(wc_ecc_sig_to_rs(sig, siglen, r, &zeroLen, s, &slen),
+        WC_NO_ERR_TRACE(ASN_PARSE_E));
+    ExpectIntEQ(wc_ecc_sig_to_rs(sig, siglen, r, &rlen, s, &zeroLen),
+        WC_NO_ERR_TRACE(ASN_PARSE_E));
+
 #endif
     return EXPECT_RESULT();
 } /* END test_wc_ecc_rs_to_sig */
diff --git a/wolfcrypt/src/asn.c b/wolfcrypt/src/asn.c
index eb57bdc693..2f8b6b9116 100644
--- a/wolfcrypt/src/asn.c
+++ b/wolfcrypt/src/asn.c
@@ -33784,7 +33784,7 @@ int DecodeECC_DSA_Sig_Bin(const byte* sig, word32 sigLen, byte* r, word32* rLen,
             *rLen = (word32)len;
         else {
             /* Buffer too small to hold r value */
-            return BUFFER_E;
+            return ASN_PARSE_E;
         }
     }
     if (r)
@@ -33799,7 +33799,7 @@ int DecodeECC_DSA_Sig_Bin(const byte* sig, word32 sigLen, byte* r, word32* rLen,
             *sLen = (word32)len;
         else {
             /* Buffer too small to hold r value */
-            return BUFFER_E;
+            return ASN_PARSE_E;
         }
     }
     if (s)