Calculating the md5 and sha1 hash in iOS sdk is pretty simple -

Step 1 – The very first thing you need to do is import CommonCrypto’s CommonDigest.h

1	#import <CommonCrypto/CommonDigest.h>

Step 2 – Here is the real code for calculating SHA1 and MD5 hash -

SHA1 -

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-( NSString *) sha1:( NSString *)input {   const char *cstr = [input cStringUsingEncoding: NSUTF8StringEncoding ];   NSData *data = [ NSData dataWithBytes:cstr length:input.length];     uint8_t digest[CC_SHA1_DIGEST_LENGTH];     CC_SHA1(data.bytes, 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;   }

MD5 -

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- ( NSString *) md5:( NSString *) input {   const char *cStr = [input UTF8String];   unsigned char digest[16];   CC_MD5( cStr, strlen(cStr), digest ); // This is the md5 call     NSMutableString *output = [ NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];     for ( int i = 0; i < CC_MD5_DIGEST_LENGTH; i++)   [output appendFormat: @"%02x" , digest[i]];     return  output;   }

Hope it will help someone!