> From: owner-openssl-us...@openssl.org On Behalf Of krishnamurthy
santhanam
> Sent: Friday, 10 September, 2010 05:51
> I really thanks for all your inputs and suggestions, I
> have not pasted fully last time all the output...below is the output
> > rsa = RSA_generate_key(2048, 3, NULL, NULL);
> <snip: get size, alloc keybuf, iend=keybuf>
(The code you posted before, and I quoted, was 1024 not 2048.
Either is valid, but it confuses things to mix them.)
> > size = i2d_RSAPublicKey(rsa, &iend);
> > /* size returns the size of public key in bytes */
> > printf("\n");
> > printf("key :");
> > for(i=0;i<size;++i) {
> > printf("\n%02X", keybuf[i]);
> size 270n
<snip 6*80+33 hex (lowercase) chars>
That output wasn't from the code above, and isn't valid hex
for any DER or even any bytes. Probably same bug as below.
> The below one is private key,
> rsa = RSA_generate_key(1024, 3, NULL, NULL);
> size_t size;
> unsigned char *iend, keybuf[3000];
> char keybuf1[3000];
> int i,j,n;
> size = i2d_RSAPrivateKey(rsa, NULL);
> printf("size %d\n",size);
> iend = keybuf;
> size = i2d_RSAPrivateKey(rsa, &iend);
> /* size returns the size of public key in bytes */
If you use a static-size buffer like this keybuf[]
(and it's large enough) you don't need to do the
size=i2d_(,NULL) call first. That is useful if you
want to malloc() the exact space as the code you
posted earlier did, or check overflow before storing.
> for(i=0;i<size;i++) {
> printf("%x", keybuf[i]);}
>
> size 609
<snip 14*80+45=1165 hex chars> beginning:
>
308225d210281810ef1ed52b301ac82bf74553aa4e6d3f8ad967147224cc8dce22ef158d9907
b7c7
That is different from the code you posted earlier,
and is wrong. %x prints only one hex digit for values
0-15, so you get only 1165 of the 1218 chars needed
to represent 609 bytes in undelimited hex. 609 bytes
is a good size for a RSA 1024bit privatekey, but its
first bytes must be 30 82 02 5D 02 01 00 02 81 81 00 .
Just look at your output and you can see there's no
way for a receiver to recover those bytes.
Another possibility would be to use %x but with a
nondigit like comma or space separating each byte.
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