sha1

I need a function written in Excel VBA that will hash passwords using a standard algorithm such as SHA-1. Something with a simple interface like: Public Function CreateHash(Value As String) As String ... End Function The function needs to work on an XP workstation with Excel 2003 installed, but otherwise must use no third party components. It can reference and use DLLs that are available with XP, such as CryptoAPI. Does anyone know of a sample to achieve this hashing functionality? Chris Here's a module for calculating SHA1 hashes that is usable for Excel formulas eg. '=SHA1HASH("test")'. To

I have a simple question which occured when I wanted to store the result of a SHA1 hash in a MySQL database: How long should the VARCHAR field be in which I store the hash's result? Gumbo I would use VARCHAR for variable length data, but not with fixed length data. Because a SHA-1 value is always 160 bit long, the VARCHAR would just waste an additional byte for the length of the fixed-length field . And I also wouldn’t store the value the SHA1 is returning. Because it uses just 4 bit per character and thus would need 160/4 = 40 characters. But if you use 8 bit per character, you would only

In Objective C I've been using the following code to hash a string: -(NSString *) sha1:(NSString*)stringToHash { const char *cStr = [stringToHash UTF8String]; unsigned char result[20]; CC_SHA1( cStr, strlen(cStr), result ); return [NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15], result[16], result[17], result[18], result[19] ]; } Now I need the same for

As I understand it when Git assigns a SHA1 hash to a file this SHA1 is unique to the file based on its contents. As a result if a file moves from one repository to another the SHA1 for the file remains the same as its contents have not changed. How does Git calculate the SHA1 digest? Does it do it on the full uncompressed file contents? I would like to emulate assigning SHA1's outside of Git. Ferdinand Beyer This is how Git calculates the SHA1 for a file (or, in Git terms, a "blob"): sha1("blob " + filesize + "\0" + data) So you can easily compute it yourself without having Git installed. Note

In objective-c it looks like this: #include <sys/xattr.h> @implementation NSString (reverse) -(NSString*)sha1 { NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding]; uint8_t digest[CC_SHA1_DIGEST_LENGTH]; CC_SHA1(data.bytes, (int)data.length, digest); NSMutableString *output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2]; for (int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) [output appendFormat:@"%02x", digest[i]]; return output; } @end I need something like this with Swift, is it possible? Please, show work example. Your Objective-C code (using a NSString category) can be

I need to generate HMAC-SHA1 in Objective C. But i didnt find anything that works. I tried with CommonCrypto, using CCHMAC, but didnt works. I need to generate a hmac and after generate HOTP number. Somebody have any example code in Objective C or C? Here's how you generate an HMAC using SHA-256: NSString *key; NSString *data; const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding]; const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding]; unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH]; CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC); NSData