Objective C: SHA1

Question

How do i sha1 a string or set of numbers in Objective c?

Answer 1

Another solution with a message digest library (nv-ios-digest):

(1) String

// Create an SHA1 instance, update it with a string and do final.
SHA1 sha1 = [SHA1 sha1WithString:@"Hello"];

// Get the pointer of the internal buffer that holds the message digest value.
// The life of the internal buffer ends when the SHA1 instance is discarded.
// Copy the buffer as necessary. The size of the buffer can be obtained by
// 'bufferSize' method.
unsigned char *digestAsBytes = [sha1 buffer];

// Get the string expression of the message digest value.
NSString *digestAsString = [sha1 description];

(2) Numbers

// Create an SHA1 instance.
SHA1 sha1 = [[SHA1 alloc] init];

// Update the SHA1 instance with numbers.
// (Sorry, the current implementation is endianness-dependent.)
[sha1 updateWithShort:(short)1];
[sha1 updateWithInt:(int)2];
[sha1 updateWithLong:(long)3];
[sha1 updateWithLongLong:(long long)4];
[sha1 updateWithFloat:(float)5];
[sha1 updateWithDouble:(double)6];

// Do final. 'final' method returns the pointer of the internal buffer
// that holds the message digest value. 'buffer' method returns the same.
// The life of the internal buffer ends when the SHA1 instance is discarded.
// Copy the buffer as necessary. The size of the buffer can be obtained by
// 'bufferSize' method.
unsigned char *digestAsBytes = [sha1 final];

// Get the string expression of the message digest value.
NSString *digestAsString = [sha1 description];

The message digest library supports MD5, SHA-1, SHA-224, SHA-256, SHA-384 and SHA-512.

[Blog] Message digests (MD5, SHA1, etc.) on iOS with dedicated classes
http://darutk-oboegaki.blogspot.jp/2013/04/message-digests-md5-sha1-etc-on-ios.html

[Library] nv-ios-digest
https://github.com/TakahikoKawasaki/nv-ios-digest