int wc_DerToPemEx(const byte* der, word32 derSz, byte* output, word32 outSz,
             byte *cipher_info, int type)
{
    const char* headerStr = NULL;
    const char* footerStr = NULL;
#ifdef WOLFSSL_SMALL_STACK
    char* header = NULL;
    char* footer = NULL;
#else
    char header[MAX_X509_HEADER_SZ + HEADER_ENCRYPTED_KEY_SIZE];
    char footer[MAX_X509_HEADER_SZ];
#endif
    int headerLen = MAX_X509_HEADER_SZ + HEADER_ENCRYPTED_KEY_SIZE;
    int footerLen = MAX_X509_HEADER_SZ;
    int i;
    int err;
    int outLen;   /* return length or error */

    (void)cipher_info;

    if (der == output)      /* no in place conversion */
        return BAD_FUNC_ARG;

    err = wc_PemGetHeaderFooter(type, &headerStr, &footerStr);
    if (err != 0)
        return err;

#ifdef WOLFSSL_SMALL_STACK
    header = (char*)XMALLOC(headerLen, NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (header == NULL)
        return MEMORY_E;

    footer = (char*)XMALLOC(footerLen, NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (footer == NULL) {
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        return MEMORY_E;
    }
#endif

    /* build header and footer based on type */
    XSTRNCPY(header, headerStr, headerLen - 1);
    header[headerLen - 2] = 0;
    XSTRNCPY(footer, footerStr, footerLen - 1);
    footer[footerLen - 2] = 0;

    /* add new line to end */
    XSTRNCAT(header, "\n", 2);
    XSTRNCAT(footer, "\n", 2);

#ifdef WOLFSSL_ENCRYPTED_KEYS
    err = wc_EncryptedInfoAppend(header, headerLen, (char*)cipher_info);
    if (err != 0) {
    #ifdef WOLFSSL_SMALL_STACK
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
    #endif
        return err;
    }
#endif

    headerLen = (int)XSTRLEN(header);
    footerLen = (int)XSTRLEN(footer);

    /* if null output and 0 size passed in then return size needed */
    if (!output && outSz == 0) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        outLen = 0;
        if ((err = Base64_Encode(der, derSz, NULL, (word32*)&outLen))
                != LENGTH_ONLY_E) {
            return err;
        }
        return headerLen + footerLen + outLen;
    }

    if (!der || !output) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        return BAD_FUNC_ARG;
    }

    /* don't even try if outSz too short */
    if (outSz < headerLen + footerLen + derSz) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        return BAD_FUNC_ARG;
    }

    /* header */
    XMEMCPY(output, header, headerLen);
    i = headerLen;

#ifdef WOLFSSL_SMALL_STACK
    XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif

    /* body */
    outLen = outSz - (headerLen + footerLen);  /* input to Base64_Encode */
    if ( (err = Base64_Encode(der, derSz, output + i, (word32*)&outLen)) < 0) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        return err;
    }
    i += outLen;

    /* footer */
    if ( (i + footerLen) > (int)outSz) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        return BAD_FUNC_ARG;
    }
    XMEMCPY(output + i, footer, footerLen);

#ifdef WOLFSSL_SMALL_STACK
    XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif

    return outLen + headerLen + footerLen;
}
int wc_DerToPemEx(const byte* der, word32 derSz, byte* output, word32 outSz,
             byte *cipher_info, int type)
{
    const char* headerStr = NULL;
    const char* footerStr = NULL;
#ifdef WOLFSSL_SMALL_STACK
    char* header = NULL;
    char* footer = NULL;
#else
    char header[MAX_X509_HEADER_SZ + HEADER_ENCRYPTED_KEY_SIZE];
    char footer[MAX_X509_HEADER_SZ];
#endif
    int headerLen = MAX_X509_HEADER_SZ + HEADER_ENCRYPTED_KEY_SIZE;
    int footerLen = MAX_X509_HEADER_SZ;
    int i;
    int err;
    int outLen;    

    (void)cipher_info;

    if (der == output)       
        return BAD_FUNC_ARG;

    err = wc_PemGetHeaderFooter(type, &headerStr, &footerStr);
    if (err != 0)
        return err;

#ifdef WOLFSSL_SMALL_STACK
    header = (char*)XMALLOC(headerLen, NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (header == NULL)
        return MEMORY_E;

    footer = (char*)XMALLOC(footerLen, NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (footer == NULL) {
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        return MEMORY_E;
    }
#endif

     
    XSTRNCPY(header, headerStr, headerLen - 1);
    header[headerLen - 2] = 0;
    XSTRNCPY(footer, footerStr, footerLen - 1);
    footer[footerLen - 2] = 0;

     
    XSTRNCAT(header, "\n", 2);
    XSTRNCAT(footer, "\n", 2);

#ifdef WOLFSSL_ENCRYPTED_KEYS
    err = wc_EncryptedInfoAppend(header, headerLen, (char*)cipher_info);
    if (err != 0) {
    #ifdef WOLFSSL_SMALL_STACK
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
    #endif
        return err;
    }
#endif

    headerLen = (int)XSTRLEN(header);
    footerLen = (int)XSTRLEN(footer);

     
    if (!output && outSz == 0) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        outLen = 0;
        if ((err = Base64_Encode(der, derSz, NULL, (word32*)&outLen))
                != LENGTH_ONLY_E) {
            return err;
        }
        return headerLen + footerLen + outLen;
    }

    if (!der || !output) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        return BAD_FUNC_ARG;
    }

     
    if (outSz < headerLen + footerLen + derSz) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        return BAD_FUNC_ARG;
    }

     
    XMEMCPY(output, header, headerLen);
    i = headerLen;

#ifdef WOLFSSL_SMALL_STACK
    XFREE(header, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif

     
    outLen = outSz - (headerLen + footerLen);   
    if ( (err = Base64_Encode(der, derSz, output + i, (word32*)&outLen)) < 0) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        return err;
    }
    i += outLen;

     
    if ( (i + footerLen) > (int)outSz) {
#ifdef WOLFSSL_SMALL_STACK
        XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
        return BAD_FUNC_ARG;
    }
    XMEMCPY(output + i, footer, footerLen);

#ifdef WOLFSSL_SMALL_STACK
    XFREE(footer, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif

    return outLen + headerLen + footerLen;
}