Sort out common encryption iOS and Android encryption MD5-SHA1, androidmd5-sha1

Sort out common encryption iOS and Android encryption MD5-SHA1, androidmd5-sha1

1. MD5 Algorithm

Irreversible

A 128-bit or 64-Bit String. The length of a byte number is 16 or 8. Generally, if a byte is represented by a hexadecimal notation, one byte is converted to two 16bits, indicating a high position, respectively, therefore, the generated string is either 16-bit or 32-bit. The 16-Bit String is extracted from the middle part of the 32-Bit String.

The number of bits in the password is expressed as the number of bits. If it is converted to a byte array, it is divided by 8, but if the output is hexadecimal, it is divided by 4, because "1111 1111" = "FF ";

For example, the length of the 256-bit byte array or NSData is 256/8 = 32, and the hexadecimal output is 32*2 = 64.

 

MD5 Algorithm Java code:

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;


public class EncrypMD5 {

    / **
     * TODO (description of this method)
     * @param args
     * @author 丶 贰 九 2015-4-29 5:33:52 PM
     * @since v1.0
     * /
    public static void main (String [] args) throws NoSuchAlgorithmException {
        String msg = "丶 贰 九";
        EncrypMD5 md5 = new EncrypMD5 ();
        byte [] resultBytes = md5.eccrypt (msg);
        System.out.println ("The plaintext is:" + msg);
        System.out.println ("The ciphertext is:" + EncrypMD5.hexString (resultBytes));
    }
    // byte byte converted to a hexadecimal string MD5Utils.hexString
    public static String hexString (byte [] bytes) {
        StringBuffer hexValue = new StringBuffer ();
  
        for (int i = 0; i <bytes.length; i ++) {
            int val = ((int) bytes [i]) & 0xff;
            if (val <16)
                hexValue.append ("0");
            hexValue.append (Integer.toHexString (val));
        }
        return hexValue.toString ();
    }
    
    public byte [] eccrypt (String info) throws NoSuchAlgorithmException {
        MessageDigest md5 = MessageDigest.getInstance ("MD5");
        byte [] srcBytes = info.getBytes ();
        // Update summary using srcBytes
        md5.update (srcBytes);
        // Complete the hash calculation and get result
        byte [] resultBytes = md5.digest ();
        return resultBytes;
    }
}

 

MD5 iOSObjective-C code:

// md5 encryption
-(NSString *) md5: (NSString *) str
{
     const char * cStrValue = [str UTF8String];
     unsigned char theResult [CC_MD5_DIGEST_LENGTH];
     CC_MD5 (cStrValue, (unsigned) strlen (cStrValue), theResult);
     return [NSString stringWithFormat: @ "% 02x% 02x% 02x% 02x% 02x% 02x% 02x% 02x% 02x% 02x% 02x% 02x% 02x% 02x% 02x% 02x",
             theResult [0], theResult [1], theResult [2], theResult [3],
             theResult [4], theResult [5], theResult [6], theResult [7],
             theResult [8], theResult [9], theResult [10], theResult [11],
             theResult [12], theResult [13], theResult [14], theResult [15]];
}

 

The final result is:

Plaintext: Ma erjiu
Ciphertext: 203ecebd64a8440e58acf19bbb3148dd

 

 

2. SHA Algorithm

Irreversible

SHA1, SHA256, SHA384, and SHA512 correspond to 160 bits and 256 bits respectively import java. security. MessageDigest;

 

SHAJava code of the algorithm:

 

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class EncrypSHA {

    / **
     * TODO (description of this method)
     *
     * @param args
     * @author 丶 贰 九 2015-4-29 5:12:17 PM
     * @since v1.0
     * /
    
    // byte byte converted to a hexadecimal string MD5Utils.hexString
    public byte [] eccrypt (String info, String shaType) throws NoSuchAlgorithmException {
        MessageDigest sha = MessageDigest.getInstance (shaType);
        byte [] srcBytes = info.getBytes ();
        // Update summary using srcBytes
        sha.update (srcBytes);
        // Complete the hash calculation and get result
        byte [] resultBytes = sha.digest ();
        return resultBytes;
    }

    public byte [] eccryptSHA1 (String info) throws NoSuchAlgorithmException {
        return eccrypt (info, "SHA1");
    }

    public byte [] eccryptSHA256 (String info) throws NoSuchAlgorithmException {
        return eccrypt (info, "SHA-256");
    }

    public byte [] eccryptSHA384 (String info) throws NoSuchAlgorithmException {
        return eccrypt (info, "SHA-384");
    }

    public byte [] eccryptSHA512 (String info) throws NoSuchAlgorithmException {
        return eccrypt (info, "SHA-512");
    }

    public static void main (String [] args) throws NoSuchAlgorithmException {
        String msg = "丶 贰 九";
        EncrypSHA sha = new EncrypSHA ();
        String sha1 = sha.hexString (sha.eccryptSHA1 (msg));
        System.out.println ("clear text:" + msg);
        System.out.println ("ciphertext:" + sha1);
    }
    
    public static String hexString (byte [] bytes) {
        StringBuffer hexValue = new StringBuffer ();
  
        for (int i = 0; i <bytes.length; i ++) {
            int val = ((int) bytes [i]) & 0xff;
            if (val <16)
                hexValue.append ("0");
            hexValue.append (Integer.toHexString (val));
        }
        return hexValue.toString ();
    }
}

 

SHA AlgorithmIOSObjective-C code:

 

// sha1 encryption
-(NSString *) sha1: (NSString *) str
{
     const char * cstr = [str UTF8String];
     // Use the corresponding CC_SHA1, CC_SHA256, CC_SHA384, CC_SHA512 lengths are 20, 32, 48, 64
     unsigned char digest [CC_SHA1_DIGEST_LENGTH];
     // Use the corresponding CC_SHA256, CC_SHA384, CC_SHA512
     CC_SHA1 (cstr, strlen (cstr), digest);
     NSMutableString * result = [NSMutableString stringWithCapacity: CC_SHA1_DIGEST_LENGTH * 2];
     for (int i = 0; i <CC_SHA1_DIGEST_LENGTH; i ++) {
         [result appendFormat: @ "% 02x", digest [i]];
     }
     return result;
} 

 

Plaintext: Ma erjiu
Ciphertext: 600c7ca56a913a86a501d683846752113ed65824