網上的Base64解碼器

Since two weeks, I'm trying and reading to solve this problem, but everything I tried didn't worked :-(

I'm using python 2.7.

I do have, as far as I understand, a base64-string from the format: AAMkADk0ZjU4ODc1LTY1MzAtNDdhZS04NGU5LTAwYjE2Mzg5NDA1ZABGAAAAAAAZS9Y2rt6uTJgnyUZSiNf0BwC6iam6EuExS4FgbbOF87exAAAAdGVuAAC6iam6EuExS4FgbbOF87exAAAxj5dhAAA=

I want to convert it to a hex-string. Which should result in 00000000194BD636AEDEAE4C9827C9465288D7F40700BA89A9BA12E1314B81606DB385F3B7B100000074656E0000BA89A9BA12E1314B81606DB385F3B7B10000318F97610000

I tried it with the following code:

def itemid_to_entryid(itemid):    decoded_val = base64.b64decode(itemid)    decoded_val = ''.join( ["%02X" % ord(x) for x in decoded_val ] ).strip()    decoded_val = decoded_val.upper()    return decoded_valitemid = 'AAMkADk0ZjU4ODc1LTY1MzAtNDdhZS04NGU5LTAwYjE2Mzg5NDA1ZABGAAAAAAAZS9Y2rt6uTJgnyUZSiNf0BwC6iam6EuExS4FgbbOF87exAAAAdGVuAAC6iam6EuExS4FgbbOF87exAAAxj5dhAAA='entryid = itemid_to_entryid(itemid)print(entryid)

which always returns me the following: 0003240039346635383837352D363533302D343761652D383465392D30306231363338393430356400460000000000194BD636AEDEAE4C9827C9465288D7F40700BA89A9BA12E1314B81606DB385F3B7B100000074656E0000BA89A9BA12E1314B81606DB385F3B7B10000318F97610000

and I really don't get, what I'm doing wrong and really would appreciate any help in understanding what I'm doing wrong.

Kind regardsBen

I am trying to decode data in an xml format into bytes (base64) and I am having issues. I wrote a program in java that takes a String data and converts it into bytes like this:

String data = "......"; //string of data in xml formatbyte[] dataBytes = Base64.getDecoder().decode(data);

This fails and give me and exception like this:

java.lang.IllegalArgumentException: Illegal base64 character 3c    at java.util.Base64$Decoder.decode0(Base64.java:714)    at java.util.Base64$Decoder.decode(Base64.java:526)    at java.util.Base64$Decoder.decode(Base64.java:549)    at XmlReader.main(XmlReader.java:61)

Is the xml format not compatible with base64? It seems as though the issue might be caused with the angle brackets '<>'

I can't seem to decode this base64 string

KE91fDIS2FMIop+UQ1CfR7+loc4M2f0rR2Q+MhFkPqlL3ra9hTegfOTCsoKWKm5rsv6SU5c6Eg3CxMpm9bQBwg==

Any help appreciated, thanks!

I want to extract data from .xml file using python, the problem is that I have a picture field which has an encoded code, I want to know how to decode this picture and save it as .png or .jpg?

You can see the .xml file here http://s000.tinyupload.com/index.php?file_id=03618159826049812498

The picture encoded code is too long, so I attached the file.

We have an certificate file (binary) having '\0' in multiple places. While trying to decode using openssl it gives junk data while size used to be perfect.

Same code works perfectly if there is no '\0' in the base64encoded data

We tried achieving it using below code but still file is not readable

static const std::string base64_chars ="ABCDEFGHIJKLMNOPQRSTUVWXYZ""abcdefghijklmnopqrstuvwxyz""0123456789+/";static inline bool is_base64(unsigned char c) {    return (isalnum(c) || (c == '+') || (c == '/'));}std::string base64_decode(std::string const& encoded_string) {    int in_len = encoded_string.size();    int i = 0;    int j = 0;    int in_ = 0;    int in_1 = 0;    unsigned char char_array_4[4], char_array_3[3];    std::string ret;    std::ofstream outfile;    outfile.open("output_file.pfx", std::ios::binary | std::ios::out);    bool f = isalnum(encoded_string[in_]);    while (in_len-- && (encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {        char_array_4[i++] = encoded_string[in_]; in_++;        if (i == 4) {            for (i = 0; i < 4; i++)            {                char_array_4[i] = base64_chars.find(char_array_4[i]);            }            char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);            char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);            char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];            for (i = 0; (i < 3); i++)            {                if (char_array_3[i] != NULL)                {                    ret += char_array_3[i];                    char val = char_array_3[i];                    outfile.write(&val, sizeof(char));                }                else                {                    /*char str3[3155];                    strcpy(str3, ret.c_str());                    ret = "";                    ret.append(str3, sizeof(str3));*/                    ret += "NUL";                    char val111 = char_array_3[i];                    outfile.write(&val111, sizeof(char));                }            }            i = 0;        }    }    if (i) {        for (j = 0; j < i; j++)            char_array_4[j] = base64_chars.find(char_array_4[j]);        char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);        char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);        for (j = 0; (j < i - 1); j++)        {            if (char_array_3[i] != NULL)            {                ret += char_array_3[i];                char val1 = char_array_3[i];                outfile.write(&val1, sizeof(char));            }            else            {                ret += "NUL";                char val11 = char_array_3[i];                outfile.write(&val11, sizeof(char));            }        }//ret += char_array_3[j];    }    outfile.close();    return ret;}int main(){    base64_decode("U4tR8mRzyrqpNhhFjkbEe4I6LTYXhL7PxkbddNTQ1yZ6ofZ4s1R/UOQsq6x+CNxB+yddPirwT0yPgtm6IC1qYF9GGQsOqXHkpTrmXf0GiXDVpm91EMnyxtMu74B3OMIYgxmjoeua7HoKQkW6/GRuCpgWIoZQq7uOaKIsc3k9HGgfAFk6vTGER1YJlG28lOhsiGccl0EqD0uhrBGNhFERfAzB2gaJjI1oRO87Q2NbevKHeZycpyXgazvtw9JigA+Hp3+Cy9LUIRvF6k5uv0DKxOs5cynqYslb1LfKqT0IvLjBl4gNHl+pG5/Ur70XzZTiO1+n5jWITPoslZ4slVkl4qiTaqNWHgLT6aSUhWwPlvK+7wlk+st5ykAuSIE2e3Lia+omBRH2LQfG1v7KaOJApF3k4D0li/4QWOJ3zLwBDHB6WCwMQfNS8vTRWM1yIO/o9417wJEpBlcr/B308vGheoTF9+qRKGDe0M5PNHeBbEHhgNkLsKvcS/31HK6Xd36cg85yvyLghQRr9Gyn7TUU5m6f6iSlx3u+yo1vT7BBV6OjbxPklwCIYCZWIIOJq10JXC+bSGPbTKZYXjQW90URKesUOMi9s+DS7BKVEr471AnEyazividrgivfHDNWQisIcOctpDFCfEBAa28PYjIj4KJo5bDkSluRVcVDJVrP2Ns=");    return 0;}