Function md_util_base64url_encode

modules/md/md_util.c:1207–1234

}

const char *md_util_base64url_encode(const md_data_t *data, apr_pool_t *pool)
{
    int i, len = (int)data->len;
    apr_size_t slen = ((data->len+2)/3)*4 + 1; /* 0 terminated */
    const unsigned char *udata = (const unsigned char*)data->data;
    unsigned char *enc, *p = apr_pcalloc(pool, slen);
    
    enc = p;
    for (i = 0; i < len-2; i+= 3) {
        *p++ = BASE64URL_CHAR( (udata[i]   >> 2) );
        *p++ = BASE64URL_CHAR( (udata[i]   << 4) + (udata[i+1] >> 4) );
        *p++ = BASE64URL_CHAR( (udata[i+1] << 2) + (udata[i+2] >> 6) );
        *p++ = BASE64URL_CHAR( (udata[i+2]) );
    }
    
    if (i < len) {
        *p++ = BASE64URL_CHAR( (udata[i] >> 2) );
        if (i == (len - 1)) {
            *p++ = BASE64URL_CHARS[ ((unsigned int)udata[i] << 4) & 0x3fu ];
        }
        else {
            *p++ = BASE64URL_CHAR( (udata[i] << 4) + (udata[i+1] >> 4) );
            *p++ = BASE64URL_CHAR( (udata[i+1] << 2) );
        }
    }
    *p++ = '\0';
    return (char *)enc;
}

/*******************************************************************************
 * link header handling