diff --git a/doc/dox_comments/header_files/sha256.h b/doc/dox_comments/header_files/sha256.h
index 8a896ff795f..b88b0269a21 100644
--- a/doc/dox_comments/header_files/sha256.h
+++ b/doc/dox_comments/header_files/sha256.h
@@ -402,12 +402,16 @@ int wc_Sha256_Grow(wc_Sha256* sha256, const byte* in, int inSz);
     \ingroup SHA
     \brief Copies SHA256 context.
 
+    The memory regions occupied by the source and destination structures
+    must not overlap. If they overlap, including when src == dst, the
+    behavior is undefined.
+
     \return 0 on success
     \return negative on error
 
     \param src Source SHA256 structure
     \param dst Destination SHA256 structure;
-    (must be zeroed or previously initialized)
+    (must be zeroed or previously initialized and must not overlap src)
 
     _Example_
     \code
@@ -613,12 +617,16 @@ int wc_Sha224GetHash(wc_Sha224* sha224, byte* hash);
     \ingroup SHA
     \brief Copies SHA224 context.
 
+    The memory regions occupied by the source and destination structures
+    must not overlap. If they overlap, including when src == dst, the
+    behavior is undefined.
+
     \return 0 on success
     \return negative on error
 
     \param src Source SHA224 structure
     \param dst Destination SHA224 structure
-    (must be zeroed or previously initialized)
+    (must be zeroed or previously initialized and must not overlap src)
 
     _Example_
     \code
diff --git a/wolfcrypt/src/sha256.c b/wolfcrypt/src/sha256.c
index 12e95b6aef8..0b19caea404 100644
--- a/wolfcrypt/src/sha256.c
+++ b/wolfcrypt/src/sha256.c
@@ -3426,7 +3426,7 @@ int wc_Sha224Reset(wc_Sha224* sha224) {
     {
         int ret = 0; /* assume success unless proven otherwise */
 
-        if (src == NULL || dst == NULL) {
+        if (src == NULL || dst == NULL || src == dst) {
             return BAD_FUNC_ARG;
         }
 
@@ -3575,7 +3575,7 @@ int wc_Sha256Copy(wc_Sha256* src, wc_Sha256* dst)
 {
     int ret = 0;
 
-    if (src == NULL || dst == NULL) {
+    if (src == NULL || dst == NULL || src == dst) {
         return BAD_FUNC_ARG;
     }
 
diff --git a/wolfcrypt/test/test.c b/wolfcrypt/test/test.c
index 3ca57e524ca..aceb49786a8 100644
--- a/wolfcrypt/test/test.c
+++ b/wolfcrypt/test/test.c
@@ -6573,6 +6573,20 @@ static wc_test_ret_t sha224_copy_test(wc_Sha224* sha, wc_Sha224* shaCopy)
     ret = wc_Sha224Update(shaCopy, (byte*)b_input, (word32)XSTRLEN(b_input));
     if (ret != 0)
         ERROR_OUT(WC_TEST_RET_ENC_EC(ret), exit);
+    /* The common implementation rejects self-copy with BAD_FUNC_ARG.
+     * Platform-specific implementations differ: some accept self-copy as a
+     * no-op, while others do not check for it. Keep this assertion limited
+     * to configurations that use the common implementation. */
+#if !defined(WOLFSSL_TI_HASH) && !defined(WOLFSSL_RENESAS_RX64_HASH) && \
+    (!defined(WOLFSSL_RENESAS_RSIP) || \
+     defined(NO_WOLFSSL_RENESAS_FSPSM_HASH)) && \
+    (!defined(WOLFSSL_KCAPI_HASH) || defined(WOLFSSL_NO_KCAPI_SHA224)) && \
+    (!defined(WOLFSSL_HAVE_PSA) || defined(WOLFSSL_PSA_NO_HASH)) && \
+    !defined(MAX3266X_SHA)
+    ret = wc_Sha224Copy(sha, sha);
+    if (ret != WC_NO_ERR_TRACE(BAD_FUNC_ARG))
+        ERROR_OUT(WC_TEST_RET_ENC_NC, exit);
+#endif
     ret = wc_Sha224Update(sha, (byte*)a_input, (word32)XSTRLEN(a_input));
     if (ret != 0)
         ERROR_OUT(WC_TEST_RET_ENC_EC(ret), exit);
@@ -6876,6 +6890,25 @@ static wc_test_ret_t sha256_copy_test(wc_Sha256* sha, wc_Sha256* shaCopy)
     ret = wc_Sha256Update(shaCopy, (byte*)b_input, (word32)XSTRLEN(b_input));
     if (ret != 0)
         ERROR_OUT(WC_TEST_RET_ENC_EC(ret), exit);
+#endif
+    /* The common implementation rejects self-copy with BAD_FUNC_ARG.
+     * Platform-specific implementations differ: some accept self-copy as a
+     * no-op, while others do not check for it. Keep this assertion limited
+     * to configurations that use the common implementation. */
+#if !defined(WOLFSSL_TI_HASH) && !defined(WOLFSSL_AFALG_HASH) && \
+    !defined(WOLFSSL_DEVCRYPTO_HASH) && \
+    ((!defined(WOLFSSL_RENESAS_TSIP_TLS) && \
+      !defined(WOLFSSL_RENESAS_TSIP_CRYPTONLY)) || \
+     defined(NO_WOLFSSL_RENESAS_TSIP_CRYPT_HASH)) && \
+    ((!defined(WOLFSSL_RENESAS_SCEPROTECT) && \
+      !defined(WOLFSSL_RENESAS_RSIP)) || \
+     defined(NO_WOLFSSL_RENESAS_FSPSM_HASH)) && \
+    !defined(WOLFSSL_IMXRT_DCP) && !defined(WOLFSSL_KCAPI_HASH) && \
+    (!defined(WOLFSSL_HAVE_PSA) || defined(WOLFSSL_PSA_NO_HASH)) && \
+    !defined(WOLFSSL_RENESAS_RX64_HASH) && !defined(MAX3266X_SHA)
+    ret = wc_Sha256Copy(sha, sha);
+    if (ret != WC_NO_ERR_TRACE(BAD_FUNC_ARG))
+        ERROR_OUT(WC_TEST_RET_ENC_NC, exit);
 #endif
     ret = wc_Sha256Update(sha, (byte*)a_input, (word32)XSTRLEN(a_input));
     if (ret != 0)