Comments on: Howto base64 encode with C/C++ and OpenSSL http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/ Thoughts on Software Development and Engineering Thu, 05 Jan 2012 16:35:51 +0000 hourly 1 By: trulyliu http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-198180 trulyliu Wed, 16 Feb 2011 02:37:51 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-198180 There is a minor mistake in your code: char *buff = (char *)malloc(bptr->length +1); memcpy(buff, bptr->data, bptr->length); buff[bptr->length] = 0; There is a minor mistake in your code:

char *buff = (char *)malloc(bptr->length +1);
memcpy(buff, bptr->data, bptr->length);
buff[bptr->length] = 0;

]]> By: Bill http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-172192 Bill Fri, 18 Jun 2010 19:07:46 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-172192 /* ** returns the length of the b64 decoded buffer, outbuf is set to a pointer ** to new memory containing the result. This will be null terminated with ** an extra byte. ** ** Caller must free the returned string pointed to in outbuf. */ int base64d(const unsigned char *input, int length, char **outbuf) { BIO *bio, *b64, *bmem, *decoder; char inbuf[512]; int inlen, readlen = -1; BUF_MEM *bptr; char * buffer; bmem = BIO_new_mem_buf(input, length); b64 = BIO_new(BIO_f_base64()); /* decoder = BIO_new(BIO_s_mem()); */ decoder = BIO_push(b64, bmem); /* BIO_push(decoder, b64); */ BIO_flush(decoder); BIO_get_mem_ptr(decoder, &bptr); if (buffer = (char *)malloc(length)) { readlen = BIO_read(decoder, buffer, length); buffer[readlen] = 0; } BIO_free_all(decoder); *outbuf = buffer; return readlen; } /*
** returns the length of the b64 decoded buffer, outbuf is set to a pointer
** to new memory containing the result. This will be null terminated with
** an extra byte.
**
** Caller must free the returned string pointed to in outbuf.
*/
int base64d(const unsigned char *input, int length, char **outbuf) {

BIO *bio, *b64, *bmem, *decoder;
char inbuf[512];
int inlen, readlen = -1;
BUF_MEM *bptr;
char * buffer;

bmem = BIO_new_mem_buf(input, length);
b64 = BIO_new(BIO_f_base64());
/* decoder = BIO_new(BIO_s_mem()); */

decoder = BIO_push(b64, bmem);
/* BIO_push(decoder, b64); */

BIO_flush(decoder);
BIO_get_mem_ptr(decoder, &bptr);

if (buffer = (char *)malloc(length)) {
readlen = BIO_read(decoder, buffer, length);
buffer[readlen] = 0;
}

BIO_free_all(decoder);

*outbuf = buffer;
return readlen;
}

]]> By: Jon Scobie http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-122712 Jon Scobie Tue, 10 Feb 2009 15:03:41 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-122712 I think you'll find that you should be using strlen("YOYO!") not sizeof as that will return a completely different answer. If you test with "uuencode -m" or "openssl enc" you will see what I mean. I think you'll find that you should be using strlen("YOYO!") not sizeof as that will return a completely different answer. If you test with "uuencode -m" or "openssl enc" you will see what I mean.

]]> By: Amit http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-80015 Amit Sat, 05 Jul 2008 13:19:36 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-80015 Hi Subra, base64 algorithm in itself appends a carriage return and linefeed characters after its 'linesize' character and at the end of the test to be encoded. This infact increases the length of the encoded string by about 3%, but this cannot be avoided. Hi Subra,

base64 algorithm in itself appends a carriage return and linefeed characters after its 'linesize' character and at the end of the test to be encoded. This infact increases the length of the encoded string by about 3%, but this cannot be avoided.

]]> By: Subra http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-59187 Subra Wed, 19 Mar 2008 15:37:40 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-59187 Hey Carson, Thanks for the code. But do you have any idea as to why ur function base64 adds a newline ('\n') character at the end of the string. Similarly, ut base64 decode function expects a newline character at the end. Thanks Hey Carson,

Thanks for the code. But do you have any idea as to why ur function base64 adds a newline ('\n') character at the end of the string.

Similarly, ut base64 decode function expects a newline character at the end.

Thanks

]]> By: Antonio http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-30768 Antonio Tue, 02 Oct 2007 16:52:27 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-30768 Hi. I tested your program and it good i like. Do you have one example to sign a document with openSSL ? thanks. Hi.
I tested your program and it good i like.
Do you have one example to sign a document with openSSL ?

thanks.

]]> By: Pádraig Brady http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-28764 Pádraig Brady Thu, 13 Sep 2007 09:54:05 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-28764 Ha, I just noticed this now after figuring out myself how to do it: http://www.pixelbeat.org/programming/lib_crypto.html Referenced there is a small wrapper library around libcrypto that uses the same method you do for base64 encoding (the lib also has interfaces for digests, and symmetric and assymetric ciphers). Note my lib is a little more generalised, and also more robust in the case of memory exhaustion. cheers, Pádraig. Ha, I just noticed this now after
figuring out myself how to do it:

http://www.pixelbeat.org/programming/lib_crypto.html

Referenced there is a small wrapper library
around libcrypto that uses the same
method you do for base64 encoding
(the lib also has interfaces for digests,
and symmetric and assymetric ciphers).
Note my lib is a little more generalised,
and also more robust in the case of memory exhaustion.

cheers,
Pádraig.

]]> By: Howto base64 decode with C/C++ and OpenSSL @ IONCANNON http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-4437 Howto base64 decode with C/C++ and OpenSSL @ IONCANNON Wed, 28 Feb 2007 13:27:52 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-4437 [...] Someone asked for an example of decoding with OpenSSL on the Howto base64 encode with C/C++ and OpenSSL post. So here it is: #include <string.h> [...] [...] Someone asked for an example of decoding with OpenSSL on the Howto base64 encode with C/C++ and OpenSSL post. So here it is: #include <string.h> [...]

]]> By: offir http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-3832 offir Tue, 20 Feb 2007 15:44:44 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-3832 Can you Plz publish a parallel function for Base64 decoding? Can you Plz publish a parallel function for Base64 decoding?

]]> By: carson http://www.ioncannon.net/programming/34/howto-base64-encode-with-cc-and-openssl/comment-page-1/#comment-2922 carson Thu, 08 Feb 2007 15:16:01 +0000 http://www.ioncannon.net/uncategorized/34/howto-base64-encode-with-cc-and-openssl/#comment-2922 Sorry about that. I believe somewhere along the line an upgrade to the blog software converted some of the code into html. It should be good now. Sorry about that. I believe somewhere along the line an upgrade to the blog software converted some of the code into html. It should be good now.

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