SM3 Digest

Similar to MD5, SHA1 and other digest algorithms, GMSm3Utils is a tool class for implementing SM3 digest algorithm and HMAC message authentication code.

SM3 Digest Calculation

SM3 digest algorithm can perform digest calculation on text and files. SM3 digest length is 64 bytes HEX encoding format string.

// String input, return hexadecimal digest
NSString *digest = [GMSm3Utils hashWithText:@"Hello, SM3!"];

// Binary data input, return byte array
NSData *data = [@"Binary Data" dataUsingEncoding:NSUTF8StringEncoding];
NSData *digest = [GMSm3Utils hashWithData:data];

HMAC calculation

By default, SM3 algorithm is used to calculate HMAC, and other algorithms such as MD5, SHA1, SHA224/256/384/512 are supported.

// Calculate HMAC digest using SM3 by default
NSString *hmac = [GMSm3Utils hmacWithText:@"Message" keyText:@"SecretKey"];

// NSData format of plain text 123456
NSData *plainData = [@"123456" dataUsingEncoding:NSUTF8StringEncoding];
// Key used for encryption
NSData *keyData = [@"qwertyuiop1234567890" dataUsingEncoding:NSUTF8StringEncoding];
// Calculate HMAC digest using MD5
NSData *hmacMD5 = [GMSm3Utils hmacWithData:plainData keyData:keyData keyType:GMHashType_MD5];
// Calculate HMAC digest using SHA1
NSData *hmacSHA1 = [GMSm3Utils hmacWithData:plainData keyData:keyData keyType:GMHashType_SHA1]; 
// Calculate HMAC digest using SHA224 
NSData *hmacSHA224 = [GMSm3Utils hmacWithData:plainData keyData:keyData keyType:GMHashType_SHA224]; 
// Calculate HMAC digest using SHA256 
NSData *hmacSHA256 = [GMSm3Utils hmacWithData:plainData keyData:keyData keyType:GMHashType_SHA256]; 
// Calculate HMAC digest using SHA384 
NSData *hmacSHA384 = [GMSm3Utils hmacWithData:plainData keyData:keyData keyType:GMHashType_SHA384]; 
// Calculate HMAC digest using SHA512 
NSData *hmacSHA512 = [GMSm3Utils hmacWithData:plainData keyData:keyData keyType:GMHashType_SHA512];