Hello, On Fri, 24 May 2002, Stella Power wrote:
> I'm having problems with SHA1() and I'm hoping some of you might be able to > help me out. > > I want to calculate the sha1 checksum of a file which i have mapped into > memory (char *mapped_encrypted_file;). I use strlen on that to get its > length (unsigned long maplength;). Are you sure that your file contains a terminal zero? If your file doesn't have any zero byte, then the strlen() will fail. > I also malloc space for my md (unsigned > char *md;) as follows: > md = (unsigned char*)malloc(BUFSIZE*sizeof(unsigned char)); which could be replaced by: md = malloc(BUFSIZE); * sizeof(char) and sizeof(unsigned char) is always 1 (defined by the standard) * malloc() returns a void*, which can be stored in any pointer to data, without any cast. That's only valid in C. > and call SHA1() by: > SHA1((const unsigned char*)mapped_encrypted_file, maplength, md); > However whenever I print md I just get weird characters - non-alphanumeric > characters, $/\[ and other letters with accents. Since the digest will be binary data, then printf()'ing it will surely display weird values. Try to hexify it or base64-encode it before you display it. Please note that the digest is *not* a character string, it's an array or chars, with no terminal zero, but with a constant and known length (BUFSIZE). -- Erwann ABALEA <[EMAIL PROTECTED]> - RSA PGP Key ID: 0x2D0EABD5 ----- > - Bientot==> Une rubrique membre avec photos > - Bientot==> "Un chat on line" pour discuter Si j'amène la photo de mon membre, je pourai caresser le chat ? -+- FF in Guide du Neuneu Usenet - Cha chanonchait bien pourtant -+- ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
