全球播报:非对称加解密算法SM2

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全球播报:非对称加解密算法SM2

2023-01-19 15:08:57 来源：博客园

原文链接：https://blog.csdn.net/TurboAnho/article/details/126647410

【资料图】

SM2是国家密码管理局于2010年12月17日发布的椭圆曲线公钥密码算法。

SM2算法和RSA算法都是公钥密码算法，SM2算法是一种更先进安全的算法，在我们国家商用密码体系中被用来替换RSA算法。

随着密码技术和计算机技术的发展，目前常用的1024位RSA算法面临严重的安全威胁，我们国家密码管理部门经过研究，决定采用SM2椭圆曲线算法替换RSA算法。

SM2算法和RSA算法比较 SM2性能更优更安全：密码复杂度高、处理速度快、机器性能消耗更小

SM2RSA算法结构

基本椭圆曲线（ECC）

基于特殊的可逆模幂运算

计算复杂度

完全指数级

亚指数级

存储空间

192-256bit

2048-4096bit

秘钥生成速度

较RSA算法快百倍以上

慢

解密加密速度

较快

一般

工具类如下：Cipher.java

import org.bouncycastle.crypto.generators.ECKeyPairGenerator;import org.bouncycastle.crypto.params.ECDomainParameters;import org.bouncycastle.crypto.params.ECKeyGenerationParameters;import org.bouncycastle.math.ec.ECCurve;import org.bouncycastle.math.ec.ECFieldElement;import org.bouncycastle.math.ec.ECFieldElement.Fp;import org.bouncycastle.math.ec.ECPoint; import java.math.BigInteger;import java.security.SecureRandom; public class SM2 { //正式参数 public static String[] ecc_param = { "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF", "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC", "28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93", "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123", "32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7", "BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0" }; public static SM2 Instance() { return new SM2(); } public final BigInteger ecc_p; public final BigInteger ecc_a; public final BigInteger ecc_b; public final BigInteger ecc_n; public final BigInteger ecc_gx; public final BigInteger ecc_gy; public final ECCurve ecc_curve; public final ECPoint ecc_point_g; public final ECDomainParameters ecc_bc_spec; public final ECKeyPairGenerator ecc_key_pair_generator; public final ECFieldElement ecc_gx_fieldelement; public final ECFieldElement ecc_gy_fieldelement; public SM2() { this.ecc_p = new BigInteger(ecc_param[0], 16); this.ecc_a = new BigInteger(ecc_param[1], 16); this.ecc_b = new BigInteger(ecc_param[2], 16); this.ecc_n = new BigInteger(ecc_param[3], 16); this.ecc_gx = new BigInteger(ecc_param[4], 16); this.ecc_gy = new BigInteger(ecc_param[5], 16); this.ecc_gx_fieldelement = new Fp(this.ecc_p, this.ecc_gx); this.ecc_gy_fieldelement = new Fp(this.ecc_p, this.ecc_gy); this.ecc_curve = new ECCurve.Fp(this.ecc_p, this.ecc_a, this.ecc_b); this.ecc_point_g = new ECPoint.Fp(this.ecc_curve, this.ecc_gx_fieldelement, this.ecc_gy_fieldelement); this.ecc_bc_spec = new ECDomainParameters(this.ecc_curve, this.ecc_point_g, this.ecc_n); ECKeyGenerationParameters ecc_ecgenparam; ecc_ecgenparam = new ECKeyGenerationParameters(this.ecc_bc_spec, new SecureRandom()); this.ecc_key_pair_generator = new ECKeyPairGenerator(); this.ecc_key_pair_generator.init(ecc_ecgenparam); }}SM2Utils.java

import org.bouncycastle.crypto.AsymmetricCipherKeyPair;import org.bouncycastle.crypto.params.ECPrivateKeyParameters;import org.bouncycastle.crypto.params.ECPublicKeyParameters;import org.bouncycastle.math.ec.ECPoint; import java.io.IOException;import java.math.BigInteger;import java.util.Arrays; public class SM2Utils { //生成随机秘钥对 public static void generateKeyPair(){ SM2 sm2 = SM2.Instance(); AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.generateKeyPair(); ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.getPrivate(); ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.getPublic(); BigInteger privateKey = ecpriv.getD(); ECPoint publicKey = ecpub.getQ(); System.out.println("公钥: " + Util.byteToHex(publicKey.getEncoded())); System.out.println("私钥: " + Util.byteToHex(privateKey.toByteArray())); } // 国密规范正式私钥 private static String prik = "00C27C803367F9D6CFEC4B346E029DF63EEBF470036543D459A62E36C5C1A86925"; // 国密规范正式公钥 private static String pubk = "04BDF955A37EFAC70111B533F0DBFBB368C50B9015213C31359BA3FB3B600D0BD8A1BD2F152180AAB7448EB281C8CE3938CF1BE005D664950E6A9CCF3B10C61E52"; //数据加密 public static String encrypt(byte[] data) throws IOException { byte[] publicKey =Util.hexToByte(pubk); if (data == null || data.length == 0) { return null; } byte[] source = new byte[data.length]; System.arraycopy(data, 0, source, 0, data.length); Cipher cipher = new Cipher(); SM2 sm2 = SM2.Instance(); ECPoint userKey = sm2.ecc_curve.decodePoint(publicKey); ECPoint c1 = cipher.Init_enc(sm2, userKey); cipher.Encrypt(source); byte[] c3 = new byte[32]; cipher.Dofinal(c3); //C1 C2 C3拼装成加密字串 return Util.byteToHex(c1.getEncoded()) + Util.byteToHex(source) + Util.byteToHex(c3); } //数据解密 public static byte[] decrypt( byte[] encryptedData) throws IOException { byte[] privateKey=Util.hexToByte(prik); if (encryptedData == null || encryptedData.length == 0) { return null; } //加密字节数组转换为十六进制的字符串长度变为encryptedData.length * 2 String data = Util.byteToHex(encryptedData); /***分解加密字串 * （C1 = C1标志位2位 + C1实体部分128位 = 130） * （C3 = C3实体部分64位 = 64） * （C2 = encryptedData.length * 2 - C1长度 - C2长度） */ byte[] c1Bytes = Util.hexToByte(data.substring(0,130)); int c2Len = encryptedData.length - 97; byte[] c2 = Util.hexToByte(data.substring(130,130 + 2 * c2Len)); byte[] c3 = Util.hexToByte(data.substring(130 + 2 * c2Len,194 + 2 * c2Len)); SM2 sm2 = SM2.Instance(); BigInteger userD = new BigInteger(1, privateKey); //通过C1实体字节来生成ECPoint ECPoint c1 = sm2.ecc_curve.decodePoint(c1Bytes); Cipher cipher = new Cipher(); cipher.Init_dec(userD, c1); cipher.Decrypt(c2); cipher.Dofinal(c3); //返回解密结果 return c2; } public static void main(String[] args) throws Exception { //生成公钥私钥// generateKeyPair(); //加解密测试 String a = "saassa"; String j = SM2Utils.encrypt( a.getBytes()); System.out.println("加密 = " + j); System.out.println("解密 = " + new String(SM2Utils.decrypt( Util.hexToByte(j)))); }} SM3.java

public class SM3 { public static final byte[] iv = { 0x73, (byte) 0x80, 0x16, 0x6f, 0x49, 0x14, (byte) 0xb2, (byte) 0xb9, 0x17, 0x24, 0x42, (byte) 0xd7, (byte) 0xda, (byte) 0x8a, 0x06, 0x00, (byte) 0xa9, 0x6f, 0x30, (byte) 0xbc, (byte) 0x16, 0x31, 0x38, (byte) 0xaa, (byte) 0xe3, (byte) 0x8d, (byte) 0xee, 0x4d, (byte) 0xb0, (byte) 0xfb, 0x0e, 0x4e }; public static int[] Tj = new int[64]; static { for (int i = 0; i < 16; i++) { Tj[i] = 0x79cc4519; } for (int i = 16; i < 64; i++) { Tj[i] = 0x7a879d8a; } } public static byte[] CF(byte[] V, byte[] B) { int[] v, b; v = convert(V); b = convert(B); return convert(CF(v, b)); } private static int[] convert(byte[] arr) { int[] out = new int[arr.length / 4]; byte[] tmp = new byte[4]; for (int i = 0; i < arr.length; i += 4) { System.arraycopy(arr, i, tmp, 0, 4); out[i / 4] = bigEndianByteToInt(tmp); } return out; } private static byte[] convert(int[] arr) { byte[] out = new byte[arr.length * 4]; byte[] tmp = null; for (int i = 0; i < arr.length; i++) { tmp = bigEndianIntToByte(arr[i]); System.arraycopy(tmp, 0, out, i * 4, 4); } return out; } public static int[] CF(int[] V, int[] B) { int a, b, c, d, e, f, g, h; int ss1, ss2, tt1, tt2; a = V[0]; b = V[1]; c = V[2]; d = V[3]; e = V[4]; f = V[5]; g = V[6]; h = V[7]; int[][] arr = expand(B); int[] w = arr[0]; int[] w1 = arr[1]; for (int j = 0; j < 64; j++) { ss1 = (bitCycleLeft(a, 12) + e + bitCycleLeft(Tj[j], j)); ss1 = bitCycleLeft(ss1, 7); ss2 = ss1 ^ bitCycleLeft(a, 12); tt1 = FFj(a, b, c, j) + d + ss2 + w1[j]; tt2 = GGj(e, f, g, j) + h + ss1 + w[j]; d = c; c = bitCycleLeft(b, 9); b = a; a = tt1; h = g; g = bitCycleLeft(f, 19); f = e; e = P0(tt2); } int[] out = new int[8]; out[0] = a ^ V[0]; out[1] = b ^ V[1]; out[2] = c ^ V[2]; out[3] = d ^ V[3]; out[4] = e ^ V[4]; out[5] = f ^ V[5]; out[6] = g ^ V[6]; out[7] = h ^ V[7]; return out; } private static int[][] expand(int[] B) { int W[] = new int[68]; int W1[] = new int[64]; for (int i = 0; i < B.length; i++) { W[i] = B[i]; } for (int i = 16; i < 68; i++) { W[i] = P1(W[i - 16] ^ W[i - 9] ^ bitCycleLeft(W[i - 3], 15)) ^ bitCycleLeft(W[i - 13], 7) ^ W[i - 6]; } for (int i = 0; i < 64; i++) { W1[i] = W[i] ^ W[i + 4]; } int arr[][] = new int[][] { W, W1 }; return arr; } private static byte[] bigEndianIntToByte(int num) { return back(Util.intToBytes(num)); } private static int bigEndianByteToInt(byte[] bytes) { return Util.byteToInt(back(bytes)); } private static int FFj(int X, int Y, int Z, int j) { if (j >= 0 && j <= 15) { return FF1j(X, Y, Z); } else { return FF2j(X, Y, Z); } } private static int GGj(int X, int Y, int Z, int j) { if (j >= 0 && j <= 15) { return GG1j(X, Y, Z); } else { return GG2j(X, Y, Z); } } // 逻辑位运算函数 private static int FF1j(int X, int Y, int Z) { int tmp = X ^ Y ^ Z; return tmp; } private static int FF2j(int X, int Y, int Z) { int tmp = ((X & Y) | (X & Z) | (Y & Z)); return tmp; } private static int GG1j(int X, int Y, int Z) { int tmp = X ^ Y ^ Z; return tmp; } private static int GG2j(int X, int Y, int Z) { int tmp = (X & Y) | (~X & Z); return tmp; } private static int P0(int X) { int y = rotateLeft(X, 9); y = bitCycleLeft(X, 9); int z = rotateLeft(X, 17); z = bitCycleLeft(X, 17); int t = X ^ y ^ z; return t; } private static int P1(int X) { int t = X ^ bitCycleLeft(X, 15) ^ bitCycleLeft(X, 23); return t; } /** * 对最后一个分组字节数据padding * * @param in * @param bLen * 分组个数 * @return */ public static byte[] padding(byte[] in, int bLen) { int k = 448 - (8 * in.length + 1) % 512; if (k < 0) { k = 960 - (8 * in.length + 1) % 512; } k += 1; byte[] padd = new byte[k / 8]; padd[0] = (byte) 0x80; long n = in.length * 8 + bLen * 512; byte[] out = new byte[in.length + k / 8 + 64 / 8]; int pos = 0; System.arraycopy(in, 0, out, 0, in.length); pos += in.length; System.arraycopy(padd, 0, out, pos, padd.length); pos += padd.length; byte[] tmp = back(Util.longToBytes(n)); System.arraycopy(tmp, 0, out, pos, tmp.length); return out; } /** * 字节数组逆序 * * @param in * @return */ private static byte[] back(byte[] in) { byte[] out = new byte[in.length]; for (int i = 0; i < out.length; i++) { out[i] = in[out.length - i - 1]; } return out; } public static int rotateLeft(int x, int n) { return (x << n) | (x >> (32 - n)); } private static int bitCycleLeft(int n, int bitLen) { bitLen %= 32; byte[] tmp = bigEndianIntToByte(n); int byteLen = bitLen / 8; int len = bitLen % 8; if (byteLen > 0) { tmp = byteCycleLeft(tmp, byteLen); } if (len > 0) { tmp = bitSmall8CycleLeft(tmp, len); } return bigEndianByteToInt(tmp); } private static byte[] bitSmall8CycleLeft(byte[] in, int len) { byte[] tmp = new byte[in.length]; int t1, t2, t3; for (int i = 0; i < tmp.length; i++) { t1 = (byte) ((in[i] & 0x000000ff) << len); t2 = (byte) ((in[(i + 1) % tmp.length] & 0x000000ff) >> (8 - len)); t3 = (byte) (t1 | t2); tmp[i] = (byte) t3; } return tmp; } private static byte[] byteCycleLeft(byte[] in, int byteLen) { byte[] tmp = new byte[in.length]; System.arraycopy(in, byteLen, tmp, 0, in.length - byteLen); System.arraycopy(in, 0, tmp, in.length - byteLen, byteLen); return tmp; }}SM3Digest.java

import org.bouncycastle.util.encoders.Hex; public class SM3Digest { /** SM3值的长度 */ private static final int BYTE_LENGTH = 32; /** SM3分组长度 */ private static final int BLOCK_LENGTH = 64; /** 缓冲区长度 */ private static final int BUFFER_LENGTH = BLOCK_LENGTH * 1; /** 缓冲区 */ private byte[] xBuf = new byte[BUFFER_LENGTH]; /** 缓冲区偏移量 */ private int xBufOff; /** 初始向量 */ private byte[] V = SM3.iv.clone(); private int cntBlock = 0; public SM3Digest() { } public SM3Digest(SM3Digest t) { System.arraycopy(t.xBuf, 0, this.xBuf, 0, t.xBuf.length); this.xBufOff = t.xBufOff; System.arraycopy(t.V, 0, this.V, 0, t.V.length); } /** * SM3结果输出 * * @param out 保存SM3结构的缓冲区 * @param outOff 缓冲区偏移量 * @return */ public int doFinal(byte[] out, int outOff) { byte[] tmp = doFinal(); System.arraycopy(tmp, 0, out, 0, tmp.length); return BYTE_LENGTH; } public void reset() { xBufOff = 0; cntBlock = 0; V = SM3.iv.clone(); } /** * 明文输入 * * @param in * 明文输入缓冲区 * @param inOff * 缓冲区偏移量 * @param len * 明文长度 */ public void update(byte[] in, int inOff, int len) { int partLen = BUFFER_LENGTH - xBufOff; int inputLen = len; int dPos = inOff; if (partLen < inputLen) { System.arraycopy(in, dPos, xBuf, xBufOff, partLen); inputLen -= partLen; dPos += partLen; doUpdate(); while (inputLen > BUFFER_LENGTH) { System.arraycopy(in, dPos, xBuf, 0, BUFFER_LENGTH); inputLen -= BUFFER_LENGTH; dPos += BUFFER_LENGTH; doUpdate(); } } System.arraycopy(in, dPos, xBuf, xBufOff, inputLen); xBufOff += inputLen; } private void doUpdate() { byte[] B = new byte[BLOCK_LENGTH]; for (int i = 0; i < BUFFER_LENGTH; i += BLOCK_LENGTH) { System.arraycopy(xBuf, i, B, 0, B.length); doHash(B); } xBufOff = 0; } private void doHash(byte[] B) { byte[] tmp = SM3.CF(V, B); System.arraycopy(tmp, 0, V, 0, V.length); cntBlock++; } private byte[] doFinal() { byte[] B = new byte[BLOCK_LENGTH]; byte[] buffer = new byte[xBufOff]; System.arraycopy(xBuf, 0, buffer, 0, buffer.length); byte[] tmp = SM3.padding(buffer, cntBlock); for (int i = 0; i < tmp.length; i += BLOCK_LENGTH) { System.arraycopy(tmp, i, B, 0, B.length); doHash(B); } return V; } public void update(byte in) { byte[] buffer = new byte[] { in }; update(buffer, 0, 1); } public int getDigestSize() { return BYTE_LENGTH; } public static void main(String[] args) { byte[] md = new byte[32]; byte[] msg1 = "ererfeiisgod".getBytes(); SM3Digest sm3 = new SM3Digest(); sm3.update(msg1, 0, msg1.length); sm3.doFinal(md, 0); String s = new String(Hex.encode(md)); System.out.println(s.toUpperCase()); }}Util.java

import java.math.BigInteger; public class Util { /** * 整形转换成网络传输的字节流（字节数组）型数据 * * @param num 一个整型数据 * @return 4个字节的自己数组 */ public static byte[] intToBytes(int num) { byte[] bytes = new byte[4]; bytes[0] = (byte) (0xff & (num >> 0)); bytes[1] = (byte) (0xff & (num >> 8)); bytes[2] = (byte) (0xff & (num >> 16)); bytes[3] = (byte) (0xff & (num >> 24)); return bytes; } /** * 四个字节的字节数据转换成一个整形数据 * * @param bytes 4个字节的字节数组 * @return 一个整型数据 */ public static int byteToInt(byte[] bytes) { int num = 0; int temp; temp = (0x000000ff & (bytes[0])) << 0; num = num | temp; temp = (0x000000ff & (bytes[1])) << 8; num = num | temp; temp = (0x000000ff & (bytes[2])) << 16; num = num | temp; temp = (0x000000ff & (bytes[3])) << 24; num = num | temp; return num; } /** * 长整形转换成网络传输的字节流（字节数组）型数据 * * @param num 一个长整型数据 * @return 4个字节的自己数组 */ public static byte[] longToBytes(long num) { byte[] bytes = new byte[8]; for (int i = 0; i < 8; i++) { bytes[i] = (byte) (0xff & (num >> (i * 8))); } return bytes; } /** * 大数字转换字节流（字节数组）型数据 * * @param n * @return */ public static byte[] byteConvert32Bytes(BigInteger n) { byte tmpd[] = (byte[])null; if(n == null) { return null; } if(n.toByteArray().length == 33) { tmpd = new byte[32]; System.arraycopy(n.toByteArray(), 1, tmpd, 0, 32); } else if(n.toByteArray().length == 32) { tmpd = n.toByteArray(); } else { tmpd = new byte[32]; for(int i = 0; i < 32 - n.toByteArray().length; i++) { tmpd[i] = 0; } System.arraycopy(n.toByteArray(), 0, tmpd, 32 - n.toByteArray().length, n.toByteArray().length); } return tmpd; } /** * 换字节流（字节数组）型数据转大数字 * * @param b * @return */ public static BigInteger byteConvertInteger(byte[] b) { if (b[0] < 0) { byte[] temp = new byte[b.length + 1]; temp[0] = 0; System.arraycopy(b, 0, temp, 1, b.length); return new BigInteger(temp); } return new BigInteger(b); } /** * 根据字节数组获得值(十六进制数字) * * @param bytes * @return */ public static String getHexString(byte[] bytes) { return getHexString(bytes, true); } /** * 根据字节数组获得值(十六进制数字) * * @param bytes * @param upperCase * @return */ public static String getHexString(byte[] bytes, boolean upperCase) { String ret = ""; for (int i = 0; i < bytes.length; i++) { ret += Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1); } return upperCase ? ret.toUpperCase() : ret; } /** * 打印十六进制字符串 * * @param bytes */ public static void printHexString(byte[] bytes) { for (int i = 0; i < bytes.length; i++) { String hex = Integer.toHexString(bytes[i] & 0xFF); if (hex.length() == 1) { hex = "0" + hex; } System.out.print("0x" + hex.toUpperCase() + ","); } System.out.println(""); } /** * Convert hex string to byte[] * * @param hexString * the hex string * @return byte[] */ public static byte[] hexStringToBytes(String hexString) { if (hexString == null || hexString.equals("")) { return null; } hexString = hexString.toUpperCase(); int length = hexString.length() / 2; char[] hexChars = hexString.toCharArray(); byte[] d = new byte[length]; for (int i = 0; i < length; i++) { int pos = i * 2; d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1])); } return d; } /** * Convert char to byte * * @param c * char * @return byte */ public static byte charToByte(char c) { return (byte) "0123456789ABCDEF".indexOf(c); } /** * 用于建立十六进制字符的输出的小写字符数组 */ private static final char[] DIGITS_LOWER = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"}; /** * 用于建立十六进制字符的输出的大写字符数组 */ private static final char[] DIGITS_UPPER = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"}; /** * 将字节数组转换为十六进制字符数组 * * @param data byte[] * @return 十六进制char[] */ public static char[] encodeHex(byte[] data) { return encodeHex(data, true); } /** * 将字节数组转换为十六进制字符数组 * * @param data byte[] * @param toLowerCase true 传换成小写格式， false 传换成大写格式 * @return 十六进制char[] */ public static char[] encodeHex(byte[] data, boolean toLowerCase) { return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER); } /** * 将字节数组转换为十六进制字符数组 * * @param data byte[] * @param toDigits 用于控制输出的char[] * @return 十六进制char[] */ protected static char[] encodeHex(byte[] data, char[] toDigits) { int l = data.length; char[] out = new char[l << 1]; // two characters form the hex value. for (int i = 0, j = 0; i < l; i++) { out[j++] = toDigits[(0xF0 & data[i]) >>> 4]; out[j++] = toDigits[0x0F & data[i]]; } return out; } /** * 将字节数组转换为十六进制字符串 * * @param data byte[] * @return 十六进制String */ public static String encodeHexString(byte[] data) { return encodeHexString(data, true); } /** * 将字节数组转换为十六进制字符串 * * @param data byte[] * @param toLowerCase true 传换成小写格式， false 传换成大写格式 * @return 十六进制String */ public static String encodeHexString(byte[] data, boolean toLowerCase) { return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER); } /** * 将字节数组转换为十六进制字符串 * * @param data byte[] * @param toDigits 用于控制输出的char[] * @return 十六进制String */ protected static String encodeHexString(byte[] data, char[] toDigits) { return new String(encodeHex(data, toDigits)); } /** * 将十六进制字符数组转换为字节数组 * * @param data 十六进制char[] * @return byte[] * @throws RuntimeException 如果源十六进制字符数组是一个奇怪的长度，将抛出运行时异常 */ public static byte[] decodeHex(char[] data) { int len = data.length; if ((len & 0x01) != 0) { throw new RuntimeException("Odd number of characters."); } byte[] out = new byte[len >> 1]; // two characters form the hex value. for (int i = 0, j = 0; j < len; i++) { int f = toDigit(data[j], j) << 4; j++; f = f | toDigit(data[j], j); j++; out[i] = (byte) (f & 0xFF); } return out; } /** * 将十六进制字符转换成一个整数 * * @param ch 十六进制char * @param index 十六进制字符在字符数组中的位置 * @return 一个整数 * @throws RuntimeException 当ch不是一个合法的十六进制字符时，抛出运行时异常 */ protected static int toDigit(char ch, int index) { int digit = Character.digit(ch, 16); if (digit == -1) { throw new RuntimeException("Illegal hexadecimal character " + ch + " at index " + index); } return digit; } /** * 数字字符串转ASCII码字符串 * * @param String * 字符串 * @return ASCII字符串 */ public static String StringToAsciiString(String content) { String result = ""; int max = content.length(); for (int i = 0; i < max; i++) { char c = content.charAt(i); String b = Integer.toHexString(c); result = result + b; } return result; } /** * 十六进制转字符串 * * @param hexString * 十六进制字符串 * @param encodeType * 编码类型4：Unicode，2：普通编码 * @return 字符串 */ public static String hexStringToString(String hexString, int encodeType) { String result = ""; int max = hexString.length() / encodeType; for (int i = 0; i < max; i++) { char c = (char) hexStringToAlgorism(hexString .substring(i * encodeType, (i + 1) * encodeType)); result += c; } return result; } /** * 十六进制字符串装十进制 * * @param hex * 十六进制字符串 * @return 十进制数值 */ public static int hexStringToAlgorism(String hex) { hex = hex.toUpperCase(); int max = hex.length(); int result = 0; for (int i = max; i > 0; i--) { char c = hex.charAt(i - 1); int algorism = 0; if (c >= "0" && c <= "9") { algorism = c - "0"; } else { algorism = c - 55; } result += Math.pow(16, max - i) * algorism; } return result; } /** * 十六转二进制 * * @param hex * 十六进制字符串 * @return 二进制字符串 */ public static String hexStringToBinary(String hex) { hex = hex.toUpperCase(); String result = ""; int max = hex.length(); for (int i = 0; i < max; i++) { char c = hex.charAt(i); switch (c) { case "0": result += "0000"; break; case "1": result += "0001"; break; case "2": result += "0010"; break; case "3": result += "0011"; break; case "4": result += "0100"; break; case "5": result += "0101"; break; case "6": result += "0110"; break; case "7": result += "0111"; break; case "8": result += "1000"; break; case "9": result += "1001"; break; case "A": result += "1010"; break; case "B": result += "1011"; break; case "C": result += "1100"; break; case "D": result += "1101"; break; case "E": result += "1110"; break; case "F": result += "1111"; break; } } return result; } /** * ASCII码字符串转数字字符串 * * @param String * ASCII字符串 * @return 字符串 */ public static String AsciiStringToString(String content) { String result = ""; int length = content.length() / 2; for (int i = 0; i < length; i++) { String c = content.substring(i * 2, i * 2 + 2); int a = hexStringToAlgorism(c); char b = (char) a; String d = String.valueOf(b); result += d; } return result; } /** * 将十进制转换为指定长度的十六进制字符串 * * @param algorism * int 十进制数字 * @param maxLength * int 转换后的十六进制字符串长度 * @return String 转换后的十六进制字符串 */ public static String algorismToHexString(int algorism, int maxLength) { String result = ""; result = Integer.toHexString(algorism); if (result.length() % 2 == 1) { result = "0" + result; } return patchHexString(result.toUpperCase(), maxLength); } /** * 字节数组转为普通字符串（ASCII对应的字符） * * @param bytearray * byte[] * @return String */ public static String byteToString(byte[] bytearray) { String result = ""; char temp; int length = bytearray.length; for (int i = 0; i < length; i++) { temp = (char) bytearray[i]; result += temp; } return result; } /** * 二进制字符串转十进制 * * @param binary * 二进制字符串 * @return 十进制数值 */ public static int binaryToAlgorism(String binary) { int max = binary.length(); int result = 0; for (int i = max; i > 0; i--) { char c = binary.charAt(i - 1); int algorism = c - "0"; result += Math.pow(2, max - i) * algorism; } return result; } /** * 十进制转换为十六进制字符串 * * @param algorism * int 十进制的数字 * @return String 对应的十六进制字符串 */ public static String algorismToHEXString(int algorism) { String result = ""; result = Integer.toHexString(algorism); if (result.length() % 2 == 1) { result = "0" + result; } result = result.toUpperCase(); return result; } /** * HEX字符串前补0，主要用于长度位数不足。 * * @param str * String 需要补充长度的十六进制字符串 * @param maxLength * int 补充后十六进制字符串的长度 * @return 补充结果 */ static public String patchHexString(String str, int maxLength) { String temp = ""; for (int i = 0; i < maxLength - str.length(); i++) { temp = "0" + temp; } str = (temp + str).substring(0, maxLength); return str; } /** * 将一个字符串转换为int * * @param s * String 要转换的字符串 * @param defaultInt * int 如果出现异常,默认返回的数字 * @param radix * int 要转换的字符串是什么进制的,如16 8 10. * @return int 转换后的数字 */ public static int parseToInt(String s, int defaultInt, int radix) { int i = 0; try { i = Integer.parseInt(s, radix); } catch (NumberFormatException ex) { i = defaultInt; } return i; } /** * 将一个十进制形式的数字字符串转换为int * * @param s * String 要转换的字符串 * @param defaultInt * int 如果出现异常,默认返回的数字 * @return int 转换后的数字 */ public static int parseToInt(String s, int defaultInt) { int i = 0; try { i = Integer.parseInt(s); } catch (NumberFormatException ex) { i = defaultInt; } return i; } /** * 十六进制串转化为byte数组 * * @return the array of byte */ public static byte[] hexToByte(String hex) throws IllegalArgumentException { if (hex.length() % 2 != 0) { throw new IllegalArgumentException(); } char[] arr = hex.toCharArray(); byte[] b = new byte[hex.length() / 2]; for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) { String swap = "" + arr[i++] + arr[i]; int byteint = Integer.parseInt(swap, 16) & 0xFF; b[j] = new Integer(byteint).byteValue(); } return b; } /** * 字节数组转换为十六进制字符串 * * @param b * byte[] 需要转换的字节数组 * @return String 十六进制字符串 */ public static String byteToHex(byte b[]) { if (b == null) { throw new IllegalArgumentException( "Argument b ( byte array ) is null! "); } String hs = ""; String stmp = ""; for (int n = 0; n < b.length; n++) { stmp = Integer.toHexString(b[n] & 0xff); if (stmp.length() == 1) { hs = hs + "0" + stmp; } else { hs = hs + stmp; } } return hs.toUpperCase(); } public static byte[] subByte(byte[] input, int startIndex, int length) { byte[] bt = new byte[length]; for (int i = 0; i < length; i++) { bt[i] = input[i + startIndex]; } return bt; }}

关键词：十六进制二进制字符椭圆曲线