RSA非對稱加密和解密（同時生成密鑰）

準備jar包

bcprov-jdk16-1.46.jar

commons-codec-1.15.jar

獲取jar地址：https://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk16/1.46

https://mvnrepository.com/artifact/commons-codec/commons-codec

代碼準備

4個類：

CipherCharset

RsaBase64KeyPair

RsaUtils

TestRsaJava

CipherCharset：

package com.rsa;import java.nio.charset.Charset;public class CipherCharset {public static String CIPHER_CHARSET = Charset.defaultCharset().name();public static final String CIPHER_CHARSET_GBK = "GBK";public static final String CIPHER_CHARSET_UTF8 = "UTF-8";public static void initCharset(String charset) {CIPHER_CHARSET = charset;}public static void initGBK() {CIPHER_CHARSET = CIPHER_CHARSET_GBK;}public static void initUTF8() {CIPHER_CHARSET = CIPHER_CHARSET_UTF8;}public static String getCharset() {return CIPHER_CHARSET;} }

RsaBase64KeyPair：

package com.rsa;public class RsaBase64KeyPair {private String rsaPubBase64;private String rsaPriBase64;public RsaBase64KeyPair(String rsaPubBase64, String rsaPriBase64) {this.rsaPubBase64 = rsaPubBase64;this.rsaPriBase64 = rsaPriBase64;}public String getRsaPubBase64() {return rsaPubBase64;}public void setRsaPubBase64(String rsaPubBase64) {this.rsaPubBase64 = rsaPubBase64;}public String getRsaPriBase64() {return rsaPriBase64;}public void setRsaPriBase64(String rsaPriBase64) {this.rsaPriBase64 = rsaPriBase64;} }

RsaUtils：

package com.rsa;import org.apache.commons.codec.binary.Base64;import javax.crypto.Cipher; import java.security.*; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec;public class RsaUtils {// springboot項目可以放入application.properties中public static final String KEY_ALGORITHM = "RSA";static {try {Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());} catch (Exception e) {e.printStackTrace();}}public static byte[] subarray(byte[] array, int startIndexInclusive, int endIndexExclusive) {if (array == null) {return null;}if (startIndexInclusive < 0) {startIndexInclusive = 0;}if (endIndexExclusive > array.length) {endIndexExclusive = array.length;}int newSize = endIndexExclusive - startIndexInclusive;if (newSize <= 0) {return new byte[0];}byte[] subarray = new byte[newSize];System.arraycopy(array, startIndexInclusive, subarray, 0, newSize);return subarray;}public static byte[] addAll(byte[] array1, byte[] array2) {if (array1 == null) {return clone(array2);} else if (array2 == null) {return clone(array1);}byte[] joinedArray = new byte[array1.length + array2.length];System.arraycopy(array1, 0, joinedArray, 0, array1.length);System.arraycopy(array2, 0, joinedArray, array1.length, array2.length);return joinedArray;}public static byte[] clone(byte[] array) {if (array == null) {return null;}return (byte[]) array.clone();}//還原私鑰對象public static PrivateKey genPrivateKey(String base64Rsa) {try {KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM, "BC");PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(base64Rsa));return kf.generatePrivate(keySpec);} catch (Exception e) {e.printStackTrace();throw new IllegalArgumentException("初始化秘鑰異常");}}/*** 私鑰加密*/public static byte[] encryptByKey(byte[] srcData, Key publicKey) {try {Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");cipher.init(Cipher.ENCRYPT_MODE, publicKey);// 分段加密int blockSize = cipher.getOutputSize(srcData.length) - 11;byte[] encryptedData = null;for (int i = 0; i < srcData.length; i += blockSize) {// 注意要使用2的倍數，否則會出現加密后的內容再解密時為亂碼byte[] doFinal = cipher.doFinal(RsaUtils.subarray(srcData, i, i + blockSize));encryptedData = RsaUtils.addAll(encryptedData, doFinal);}return encryptedData;} catch (Exception e) {e.printStackTrace();}return null;}//還原公鑰對象public static PublicKey genPublicKey(String base64Rsa) {try {KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM, "BC");X509EncodedKeySpec keySpec = new X509EncodedKeySpec(Base64.decodeBase64(base64Rsa));return kf.generatePublic(keySpec);} catch (Exception e) {e.printStackTrace();throw new IllegalArgumentException("初始化秘鑰失敗");}}public static byte[] decryptKey(byte[] srcData, Key key) {try {Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");cipher.init(Cipher.DECRYPT_MODE, key);// 分段加密int blockSize = cipher.getOutputSize(srcData.length);byte[] decryptData = null;for (int i = 0; i < srcData.length; i += blockSize) {byte[] doFinal = cipher.doFinal(subarray(srcData, i, i + blockSize));decryptData = addAll(decryptData, doFinal);}return decryptData;} catch (Exception e) {e.printStackTrace();}return null;}}

TestRsaJava：

package com.rsa;import org.apache.commons.codec.binary.Base64; import java.security.*; import java.util.UUID;public class TestRsaJava {/*** 生成密鑰對(公鑰和私鑰)** @return* @throws Exception*/public static RsaBase64KeyPair genKeyPair(int size) {try {KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(RsaUtils.KEY_ALGORITHM);keyPairGen.initialize(size);KeyPair keyPair = keyPairGen.generateKeyPair();byte[] publicBytes = keyPair.getPublic().getEncoded();byte[] privateBytes = keyPair.getPrivate().getEncoded();return new RsaBase64KeyPair(Base64.encodeBase64String(publicBytes),Base64.encodeBase64String(privateBytes));} catch (Exception e) {e.printStackTrace();return null;}}/*** RSA 私鑰加密* @param src* @param base64PubRsa* @return*/public static String encryptByRsaPri(String src, String base64PubRsa) {try {PrivateKey privateKey = RsaUtils.genPrivateKey(base64PubRsa);byte[] encryptBytes = RsaUtils.encryptByKey(src.getBytes(CipherCharset.getCharset()), privateKey);return Base64.encodeBase64String(encryptBytes);} catch (Exception e) {e.printStackTrace();throw new IllegalArgumentException("rsa加密失敗");}}public static String decryptByRsaPub(String base64Src, String base64PriRsa) {try {PublicKey publicKey = RsaUtils.genPublicKey(base64PriRsa);return new String(RsaUtils.decryptKey(Base64.decodeBase64(base64Src), publicKey), CipherCharset.getCharset());} catch (Exception e) {e.printStackTrace();throw new IllegalArgumentException("rsa解密失敗");}}public static void main(String[] args) {// 生成公鑰和私鑰 // RsaBase64KeyPair keyPair = genKeyPair(1024);// 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 // System.out.println(keyPair.getRsaPriBase64());// MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCIwCfgny39B88hXHwnfRYEYw6RkPhgqCadh3v3npjlvVFwqY9LeTcAz+FMjxcaVLL/+f2coUJQzSp9qqOiCZEjZmyqdd7y/NW9wbIi6PTY6jX0MG/kkHSvFS4bmu9XZcqqfxAAuEBfR9HCJ9ESuFgIv1gGpJQ/2d699jOy+ncmDQIDAQAB // System.out.println(keyPair.getRsaPubBase64());String rsaPriBase64 = "MIICdQIBADANBgkqhkiG9w0BAQEFAASCAl8wggJbAgEAAoGBAIjAJ+CfLf0HzyFcfCd9FgRjDpGQ+GCoJp2He/eemOW9UXCpj0t5NwDP4UyPFxpUsv/5/ZyhQlDNKn2qo6IJkSNmbKp13vL81b3BsiLo9NjqNfQwb+SQdK8VLhua71dlyqp/EAC4QF9H0cIn0RK4WAi/WAaklD/Z3r32M7L6dyYNAgMBAAECgYBVX7nFpzsb1EtBJa8xLAuZ04nd4SbfmTr6cAI59l64VzhH4OPgF536OM4McOzYeHaEDruBlL+FGIFlkSm1WMmt32aQXkziKw6RPECocePjN6ao+1i7rrbBItOoNcURgm6s1iUtei/q3EE4QgdV/SG1jhUIED+mPgjz/Uoxu5sbwQJBAPrDNkIomkN3CblmV0UaoPMLAN8wuwcl8bEmZ8Baw5IobAvMcqGDgA1Ha+sJ/SQVkOZ8g0hiiy/rd/atpJmOMDECQQCLm1cAhFhPv9IUPB+3a/2XfQlkPo+4iB9eqB9QHspAii2m06JqRVWIVn08JfUIwh3Zer/pk4dkH1JZAiE87xidAkAMeUFtsQ9bY8R8EHcu3NA8xsNYVtg21tBa+4oVq24nCxO00oqxNhVck7zuiCSrctcuX+s34o8B5zikcKbLbKNBAkAAnZm/ndXJ3D2v6yf0phxDK8D72S7HEIqa30DsGIapzDIxVyOTNmUPKdp5hm1TMY/yIpFwFT92mJDDZbgBzcgdAkBSDisYn/P/wn8Wjuggao6QcIDbKhSbhJ9hVtGLteBXXCisDjCLUL8teb7xX6YS0QCOufrtB0LaxXSUKktNrjUl";String rsaPubBase64 = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCIwCfgny39B88hXHwnfRYEYw6RkPhgqCadh3v3npjlvVFwqY9LeTcAz+FMjxcaVLL/+f2coUJQzSp9qqOiCZEjZmyqdd7y/NW9wbIi6PTY6jX0MG/kkHSvFS4bmu9XZcqqfxAAuEBfR9HCJ9ESuFgIv1gGpJQ/2d699jOy+ncmDQIDAQAB";String str1 = UUID.randomUUID().toString();System.out.println(str1);// 加密之后的String encryptByRsaPub = encryptByRsaPri(str1, rsaPriBase64);System.out.println(encryptByRsaPub);// 解密之后的String decryptByRsaPri = decryptByRsaPub(encryptByRsaPub,rsaPubBase64);System.out.println(decryptByRsaPri);}}

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