I have a C App which uses openssl for Encoding and decoding which
needs to be ported to java.
The decoded text does not match between the C App and the java App.
The size of the output itself is wrong. I think i am doing something
basically wrong. pls help.
Output is not the same as seen here because of special characters
Output from C: is only 12 bytes long
ýmýýýýýý.ýýý~ý.ý.ýýýýuýýýý_ý.ýý7ýuý...`.K.|dR..ýH?ý.ý.}ý..oý
Output from Java: 128 bytes including a new line char.
+mýtýný+ýýOý~+?ý
fýý8uýý-ý_ý?f-7ýuý???`?K?|dR?ýýH?+?v?}d?ýo-ýQýxDSG-?'ýýuý?H1Fzý8|ýý}1ý~-ýHw-fý?}ýý~-_ýý_i
+HAGaBý?ý_~ý?uv?ýý?|D
Following is the code in both C and Java
C Code:
char* my = new char(172);
char base64[78];
int x;
int keyLength;
EVP_ENCODE_CTX ctx;
getbaseData()
{
memset(my,0,172);
strcpy(my,"1234567899adserffsgbhgrthfbsdferwsdfghjtyjf+dfgDGRdgHEsdfGRSGH+ASD/FG/sdfesfgW/SFVGHeERT4sEYJ5+sdfERSDFGesfsfJTdfTGJfsSfSHfEZpsdfa36fsJf3sdfaSDFSEFHYUKMF5dfftsadfsd+asffES=");
EVP_DecodeInit(&ctx);
EVP_DecodeUpdate(&ctx, (unsigned char *)base64, &x, (unsigned char *)
my, 172);
keyLength = x; //getting 48
EVP_DecodeFinal(&ctx, (unsigned char *)&base64[x], &x);
keyLength += x; //getting 12
}
Java Code used the Base64 code from
http://ostermiller.org/utils/Base64.html i also tried the B64 class
from http://sourceforge.net/snippet/detail.php?type=snippet&id=100549
- both the results are the same.
java com.Ostermiller.util.Base64 -vd
1234567899adserffsgbhgrthfbsdferwsdfghjtyjf+dfgDGRdgHEsdfGRSGH+ASD/FG/sdfesfgW/SFVGHeERT4sEYJ5+sdfERSDFGesfsfJTdfTGJfsSfSHfEZpsdfa36fsJf3sdfaSDFSEFHYUKMF5dfftsadfsd+asffES=
Roedy Green - 02 Apr 2004 01:15 GMT
>The decoded text does not match between the C App and the java App.
>The size of the output itself is wrong. I think i am doing something
>basically wrong. pls help.
see http://mindprod.com/jgloss/base64.html
Base64 output is might be chars or raw bytes, using a limited number
of the ASCII characters. What do showed there does not look like
Base64 output.
I suspect your problem lies confusing bytes with 16-bit characters
somewhere along the line.
you should see something like this:
F5s/R/DrkZeKiA==
The other possibility is that your C program is using something other
than Base64, perhaps a home-brew encoding.
--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.
Stephen Ostermiller - 04 Apr 2004 15:23 GMT
Your input is 172 characters, so your ouput should be 128 bytes.
(Base64 is 3 bytes to 4 characters, so 128 = 3/4*172 - padding)
The 12 bytes that you are getting from your C implementation is
certainly not correct.
Stephen
Michel Gallant - 04 Apr 2004 16:43 GMT
Good description here:
http://www.fourmilab.ch/webtools/base64/rfc1341.html
also, some sample encode/decode here:
"Core Java" Vol II, Horstmann, Cornell, 3rd. Edn. 1998 p. 330.
- Mitch Gallant
www.jensign.com
> Your input is 172 characters, so your ouput should be 128 bytes.
> (Base64 is 3 bytes to 4 characters, so 128 = 3/4*172 - padding)
[quoted text clipped - 3 lines]
>
> Stephen