ngx_int_t
ngx_libc_crypt(ngx_pool_t *pool, u_char *key, u_char *salt, u_char **encrypted)
{
    char               *value;
    size_t              len;
    struct crypt_data   cd;

    cd.initialized = 0;
    /* work around the glibc bug */
    cd.current_salt[0] = ~salt[0];

    value = crypt_r((char *) key, (char *) salt, &cd);

    if (value) {
        len = ngx_strlen(value) + 1;

        *encrypted = ngx_pnalloc(pool, len);
        if (*encrypted == NULL) {
            return NGX_ERROR;
        }

        ngx_memcpy(*encrypted, value, len);
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_CRIT, pool->log, ngx_errno, "crypt_r() failed");

    return NGX_ERROR;
}