diff --git a/wolfcrypt/src/port/kcapi/kcapi_aes.c b/wolfcrypt/src/port/kcapi/kcapi_aes.c
index 4a11a306f..536a955d7 100644
--- a/wolfcrypt/src/port/kcapi/kcapi_aes.c
+++ b/wolfcrypt/src/port/kcapi/kcapi_aes.c
@@ -236,7 +236,9 @@ int wc_AesGcmEncrypt(Aes* aes, byte* out, const byte* in, word32 sz,
     byte*   data = NULL;
     word32  dataSz;
     int     inbuflen = 0, outbuflen = 0;
+#ifndef KCAPI_USE_XMALLOC
     size_t  pageSz = (size_t)sysconf(_SC_PAGESIZE);
+#endif
 
     /* argument checks */
     if (aes == NULL || authTagSz > AES_BLOCK_SIZE) {
@@ -267,11 +269,17 @@ int wc_AesGcmEncrypt(Aes* aes, byte* out, const byte* in, word32 sz,
         outbuflen = (int)kcapi_aead_outbuflen_enc(aes->handle, sz, authInSz,
             authTagSz);
         dataSz = (inbuflen > outbuflen) ? inbuflen : outbuflen;
-
+    #ifdef KCAPI_USE_XMALLOC
+        data = (byte *)XMALLOC(dataSz, aes->heap, DYNAMIC_TYPE_TMP_BUFFER);
+        if (data == NULL) {
+            ret = MEMORY_E;
+        }
+    #else
         ret = posix_memalign((void*)&data, pageSz, dataSz);
         if (ret < 0) {
             ret = MEMORY_E;
         }
+    #endif
     }
 
     if (ret >= 0) {
@@ -312,10 +320,12 @@ int wc_AesGcmEncrypt(Aes* aes, byte* out, const byte* in, word32 sz,
         XMEMCPY(authTag, data + authInSz + sz, authTagSz);
     }
 
-    /* Using free as this is in an environment that will have it
-     * available along with posix_memalign. */
     if (data != NULL) {
+    #ifdef KCAPI_USE_XMALLOC
+        XFREE(data, aes->heap, DYNAMIC_TYPE_TMP_BUFFER);
+    #else
         free(data);
+    #endif
     }
     if (aes != NULL && aes->handle != NULL) {
         kcapi_aead_destroy(aes->handle);
@@ -337,7 +347,9 @@ int wc_AesGcmDecrypt(Aes* aes, byte* out, const byte* in, word32 sz,
     byte*   data = NULL;
     word32  dataSz;
     int     inbuflen = 0, outbuflen = 0;
+#ifndef KCAPI_USE_XMALLOC
     size_t  pageSz = (size_t)sysconf(_SC_PAGESIZE);
+#endif
 
     /* argument checks */
     if (aes == NULL || (sz != 0 && (in == NULL || out == NULL)) ||
@@ -369,11 +381,17 @@ int wc_AesGcmDecrypt(Aes* aes, byte* out, const byte* in, word32 sz,
         outbuflen = (int)kcapi_aead_outbuflen_dec(aes->handle, sz, authInSz,
             authTagSz);
         dataSz = (inbuflen > outbuflen) ? inbuflen : outbuflen;
-
+    #ifdef KCAPI_USE_XMALLOC
+        data = (byte*)XMALLOC(dataSz, aes->heap, DYNAMIC_TYPE_TMP_BUFFER);
+        if (data == NULL) {
+            ret = MEMORY_E;
+        }
+    #else
         ret = posix_memalign((void*)&data, pageSz, dataSz);
         if (ret < 0) {
             ret = MEMORY_E;
         }
+    #endif
     }
 
     if (ret >= 0) {
@@ -413,10 +431,12 @@ int wc_AesGcmDecrypt(Aes* aes, byte* out, const byte* in, word32 sz,
         XMEMCPY(out, data + authInSz, sz);
     }
 
-    /* Using free as this is in an environment that will have it
-     * available along with posix_memalign. */
     if (data != NULL) {
+    #ifdef KCAPI_USE_XMALLOC
+        XFREE(data, aes->heap, DYNAMIC_TYPE_TMP_BUFFER);
+    #else
         free(data);
+    #endif
     }
     if (aes != NULL && aes->handle != NULL) {
         kcapi_aead_destroy(aes->handle);
diff --git a/wolfcrypt/src/port/kcapi/kcapi_ecc.c b/wolfcrypt/src/port/kcapi/kcapi_ecc.c
index 372e0f163..07248c653 100644
--- a/wolfcrypt/src/port/kcapi/kcapi_ecc.c
+++ b/wolfcrypt/src/port/kcapi/kcapi_ecc.c
@@ -205,9 +205,11 @@ int KcapiEcc_SharedSecret(ecc_key* private_key, ecc_key* public_key, byte* out,
     int ret = 0;
     word32 kcapiCurveId = 0;
     byte* buf_aligned = NULL;
-    size_t pageSz = (size_t)sysconf(_SC_PAGESIZE);
     byte* pub = NULL;
     word32 keySz;
+#ifndef KCAPI_USE_XMALLOC
+    size_t pageSz = (size_t)sysconf(_SC_PAGESIZE);
+#endif
 
     if (private_key == NULL || private_key->dp == NULL || public_key == NULL) {
         ret = BAD_FUNC_ARG;
@@ -241,10 +243,18 @@ int KcapiEcc_SharedSecret(ecc_key* private_key, ecc_key* public_key, byte* out,
         }
     }
     if (ret == 0) {
+    #ifdef KCAPI_USE_XMALLOC
+        buf_aligned = (byte*)XMALLOC(keySz * 2, private_key->heap,
+            DYNAMIC_TYPE_TMP_BUFFER);
+        if (buf_aligned == NULL) {
+            ret = MEMORY_E;
+        }
+    #else
         ret = posix_memalign((void*)&buf_aligned, pageSz, keySz * 2);
         if (ret != 0) {
             ret = MEMORY_E;
         }
+    #endif
     }
     if (ret == 0) {
         XMEMCPY(buf_aligned, pub, keySz * 2);
@@ -259,10 +269,12 @@ int KcapiEcc_SharedSecret(ecc_key* private_key, ecc_key* public_key, byte* out,
         }
     }
 
-    /* Using free as this is in an environment that will have it
-     * available along with posix_memalign. */
     if (buf_aligned != NULL) {
+    #ifdef KCAPI_USE_XMALLOC
+        XFREE(buf_aligned, private_key->heap, DYNAMIC_TYPE_TMP_BUFFER);
+    #else
         free(buf_aligned);
+    #endif
     }
 
     return ret;
@@ -303,10 +315,12 @@ int KcapiEcc_Sign(ecc_key* key, const byte* hash, word32 hashLen, byte* sig,
 {
     int ret = 0;
     byte* buf_aligned = NULL;
-    size_t pageSz = (size_t)sysconf(_SC_PAGESIZE);
     int handleInit = 0;
     word32 keySz;
     word32 maxBufSz;
+#ifndef KCAPI_USE_XMALLOC
+    size_t pageSz = (size_t)sysconf(_SC_PAGESIZE);
+#endif
 
     if (key == NULL || key->dp == NULL) {
         ret = BAD_FUNC_ARG;
@@ -332,10 +346,18 @@ int KcapiEcc_Sign(ecc_key* key, const byte* hash, word32 hashLen, byte* sig,
     }
     if (ret == 0) {
         maxBufSz = (hashLen > keySz * 2) ? hashLen : (keySz * 2);
+    #ifdef KCAPI_USE_XMALLOC
+        buf_aligned = (unsigned char*)XMALLOC(maxBufSz, key->heap,
+            DYNAMIC_TYPE_TMP_BUFFER);
+        if (buf_aligned == NULL) {
+            ret = MEMORY_E;
+        }
+    #else
         ret = posix_memalign((void*)&buf_aligned, pageSz, maxBufSz);
         if (ret != 0) {
             ret = MEMORY_E;
         }
+    #endif
     }
     if (ret == 0) {
         XMEMCPY(buf_aligned, hash, hashLen);
@@ -348,10 +370,12 @@ int KcapiEcc_Sign(ecc_key* key, const byte* hash, word32 hashLen, byte* sig,
         }
     }
 
-    /* Using free as this is in an environment that will have it
-     * available along with posix_memalign. */
     if (buf_aligned != NULL) {
+    #ifdef KCAPI_USE_XMALLOC
+        XFREE(buf_aligned, key->heap, DYNAMIC_TYPE_TMP_BUFFER);
+    #else
         free(buf_aligned);
+    #endif
     }
 
     if (handleInit) {
@@ -398,9 +422,11 @@ int KcapiEcc_Verify(ecc_key* key, const byte* hash, word32 hashLen, byte* sig,
 {
     int ret = 0;
     byte* buf_aligned = NULL;
-    size_t pageSz = (size_t)sysconf(_SC_PAGESIZE);
     int handleInit = 0;
     word32 keySz = 0;
+#ifndef KCAPI_USE_XMALLOC
+    size_t pageSz = (size_t)sysconf(_SC_PAGESIZE);
+#endif
 
     if (key == NULL || key->dp == NULL) {
         ret = BAD_FUNC_ARG;
@@ -418,11 +444,18 @@ int KcapiEcc_Verify(ecc_key* key, const byte* hash, word32 hashLen, byte* sig,
     }
     if (ret == 0) {
         keySz = key->dp->size;
-
+    #ifdef KCAPI_USE_XMALLOC
+        buf_aligned = (byte*)XMALLOC(sigLen + hashLen, key->heap,
+            DYNAMIC_TYPE_TMP_BUFFER);
+        if (buf_aligned == NULL) {
+            ret = MEMORY_E;
+        }
+    #else
         ret = posix_memalign((void*)&buf_aligned, pageSz, sigLen + hashLen);
         if (ret != 0) {
             ret = MEMORY_E;
         }
+    #endif
     }
     if (ret == 0) {
         XMEMCPY(buf_aligned, sig, sigLen);
@@ -437,10 +470,12 @@ int KcapiEcc_Verify(ecc_key* key, const byte* hash, word32 hashLen, byte* sig,
         }
     }
 
-    /* Using free as this is in an environment that will have it
-     * available along with posix_memalign. */
     if (buf_aligned != NULL) {
+    #ifdef KCAPI_USE_XMALLOC
+        XFREE(buf_aligned, key->heap, DYNAMIC_TYPE_TMP_BUFFER);
+    #else
         free(buf_aligned);
+    #endif
     }
 
     if (handleInit) {