// public key
NSString *pubKey = @"0408E3FFF9505BCFAF9307E665E9229F4E1B3936437A870407EA3D97886BAFBC9"
                    "C624537215DE9507BC0E2DD276CF74695C99DF42424F28E9004CDE4678F63D698";
// private key
NSString *prikey = @"90F3A42B9FE24AB196305FD92EC82E647616C3A3694441FB3422E7838E24DEAE";

// plaintext
NSString *plaintext = @"123456"; // ordinary plaintext
NSString *plainHex = @"313233343536"; // Hex format character plain text (The Hex code of 123456 is 313233343536)
NSData *plainData = [NSData dataWithBytes:"123456" length:6]; // NSData format plain text

// sm2 encryption
NSString *enResult1 = [GMSm2Utils encryptText:plaintext publicKey:pubKey]; // encrypt ordinary string
NSString *enResult2 = [GMSm2Utils encryptHex:plainHex publicKey:pubKey]; // Encrypted Hex encoding format string
NSData *enResult3 = [GMSm2Utils encryptData:plainData publicKey:pubKey]; // Encrypt NSData type data

// sm2 decrypt
NSString *deResult1 = [GMSm2Utils decryptToText:enResult1 privateKey:priKey]; // Decrypt to plain text of ordinary string
NSString *deResult2 = [GMSm2Utils decryptToHex:enResult2 privateKey:priKey]; // Decrypt to plain text in Hex format
NSData *deResult3 = [GMSm2Utils decryptToData:enResult3 privateKey:priKey]; // Decrypt to plain text in NSData format

// public key
NSString *pubKey = @"0408E3FFF9505BCFAF9307E665E9229F4E1B3936437A870407EA3D97886BAFBC9"
                    "C624537215DE9507BC0E2DD276CF74695C99DF42424F28E9004CDE4678F63D698";
// private key
NSString *prikey = @"90F3A42B9FE24AB196305FD92EC82E647616C3A3694441FB3422E7838E24DEAE";

// plaintext
NSString *plaintext = @"123456"; // ordinary plaintext
NSString *plainHex = @"313233343536"; // Hex format character plain text (The Hex code of 123456 is 313233343536)
NSData *plainData = [NSData dataWithBytes:"123456" length:6]; // NSData format plain text

// When userID is passed in nil or empty, the default is 1234567812345678; when it is not empty, the signature and verification need the same ID
NSString *userID = @"[email protected]"; // userID of ordinary string
NSString *userHex = [GMUtils stringToHex:userID]; // userID in Hex format
NSData *userData = [userID dataUsingEncoding:NSUTF8StringEncoding]; // userID in NSData format

// The signature result is a 128-byte Hex format string spliced ​​by RS, the first 64 bytes are R, and the last 64 bytes are S
NSString *signStr1 = [GMSm2Utils signText:plaintext privateKey:priKey userID:userID];
NSString *signStr2 = [GMSm2Utils signHex:plainHex privateKey:priKey userHex:userHex];
NSString *signStr3 = [GMSm2Utils signData:plainData priKey:priKey userData:userData];

// Verify the signature, YES means the verification passed
BOOL isOK1 = [GMSm2Utils verifyText:plaintext signRS:signStr1 publicKey:pubKey userID:userID];
BOOL isOK2 = [GMSm2Utils verifyHex:plainHex signRS:signStr2 publicKey:pubKey userHex:userHex];
BOOL isOK3 = [GMSm2Utils verifyData:plainData signRS:signStr3 pubKey:pubKey userData:userData];

// Encoded in Der format, Der encoding and decoding should be the same as the original value
NSString *derSign1 = [GMSm2Utils derEncode:signStr1];
NSString *derSign2 = [GMSm2Utils derEncode:signStr2];
NSString *derSign3 = [GMSm2Utils derEncode:signStr3];

// Decode into RS string format, RS spliced ​​128-byte Hex format string, the first 64 bytes are R, the last 64 bytes are S
NSString *rs1 = [GMSm2Utils derDecode:derSign1];
NSString *rs2 = [GMSm2Utils derDecode:derSign2];
NSString *rs3 = [GMSm2Utils derDecode:derSign3];

// The client generates a pair of public and private keys
NSArray *clientKey = [GMSm2Utils createKeyPair];
NSString *cPubKey = clientKey[0];
NSString *cPriKey = clientKey[1];

// The server generates a pair of public and private keys
NSArray *serverKey = [GMSm2Utils createKeyPair];
NSString *sPubKey = serverKey[0];
NSString *sPriKey = serverKey[1];

// The client obtains the public key sPubKey from the server, and the client negotiates a 32-byte symmetric key clientECDH, which is 64 bytes after being converted to Hex
NSString *clientECDH = [GMSm2Utils computeECDH:sPubKey privateKey:cPriKey];
// The client sends the public key cPubKey to the server, and the server negotiates a 32-byte symmetric key serverECDH, which is 64 bytes after being converted to Hex
NSString *serverECDH = [GMSm2Utils computeECDH:cPubKey privateKey:sPriKey];

// In the case of all plaintext transmission, the client and the server negotiate an equal symmetric key, clientECDH==serverECDH is established
if ([clientECDH isEqualToString:serverECDH]) {
    NSLog(@"ECDH key negotiation is successful, the negotiated symmetric key is:\n%@", clientECDH);
}else{
    NSLog(@"ECDH key negotiation failed");
}

NSString *filePath = @"PEM or DER file address";
// Read SM2 public and private key from PEM file
NSString *pubPemKey = [GMSm2Bio readPublicKeyFromPemFile:filePath];
NSString *priPemKey = [GMSm2Bio readPrivateKeyFromPemFile:filePath];
// Read SM2 public and private key from DER file
NSString *pubDerKey = [GMSm2Bio readPublicKeyFromDerFile:filePath];
NSString *priDerKey = [GMSm2Bio readPrivateKeyFromDerFile:filePath];

NSString *savePath = @"Save SM2 public or private keys to the sandbox of the PEM/DER file";
// Save the public key string starting with 04 as a PEM or DER file, and return YES if the save is successful, otherwise NO
BOOL success1 = [GMSm2Bio savePublicKeyToPemFile:pubKey filePath:pubPemPath];
BOOL success2 = [GMSm2Bio savePublicKeyToDerFile:pubKey filePath:pubDerPath];
// Save the private key string as a PEM or DER file, return YES if saved successfully, otherwise NO
BOOL success3 = [GMSm2Bio savePrivateKeyToPemFile:priKey filePath:priPemPath];
BOOL success4 = [GMSm2Bio savePrivateKeyToDerFile:priKey filePath:priDerPath];

// Create a PEM or DER format key pair file, the array element 0 is the address of the public key file, and element 1 is the address of the private key file
NSArray<NSString *> *derFilesArray = [GMSm2Bio createDerKeyPairFiles];
NSArray<NSString *> *pemFilesArray = [GMSm2Bio createPemKeyPairFiles];

NSString *sm4Key = @"EA4EBDC1DCEAEC733FFD358BA15E8DCD"; // 32-byte Hex encoding format string key
NSString *ivec = @"1AFE5CC82D2DE304343FED0AF5FDE7FA"; // 32-byte initialization vector, required for CBC encryption mode

// plaintext
NSString *plaintext = @"123456"; // ordinary plaintext
NSData *plainData = [NSData dataWithBytes:"123456" length:6]; // NSData format plain text

// ECB encryption mode
NSString *ecbCipertext = [GMSm4Utils ecbEncryptText:plaintext key:sm4Key]; // Encrypt plain text of ordinary string
NSData *ecbCipherData = [GMSm4Utils ecbEncryptData:plainData key:sm4Key]; // Encrypt NSData type plaintext
// ECB decryption mode
NSString *ecbPlaintext = [GMSm4Utils ecbDecryptText:ecbCipertext key:sm4Key];
NSData *ecbDecryptData = [GMSm4Utils ecbDecryptData:ecbCipherData key:sm4Key];

// CBC encryption mode
NSString *cbcCipertext = [GMSm4Utils cbcEncryptText:plaintext key:sm4Key IV:ivec];
NSData *cbcCipherData = [GMSm4Utils cbcEncryptData:plainData key:sm4Key IV:ivec];
// CBC decryption mode
NSString *cbcPlaintext = [GMSm4Utils cbcDecryptText:cbcCipertext key:sm4Key IV:ivec];
NSData *cbcDecryptData = [GMSm4Utils cbcDecryptData:cbcCipherData key:sm4Key IV:ivec];

// Original
NSString *plaintext = @"123456"; // normal original text
NSData *plainData = [NSData dataWithBytes:"123456" length:6]; // NSData format original text

// String summary
NSString *textDigest = [GMSm3Utils hashWithString:plaintext];
// Summary of NSData
NSString *dataDigest = [GMSm3Utils hashWithData:plainData];

NSString *plaintext = @"123456"; // plaintext
NSString *randomKey = @"qwertyuiop1234567890"; // Key passed from the server
// HMAC uses SM3 digest algorithm
NSString *hmacSM3 = [GMSm3Utils hmacWithSm3:randomKey plaintext:plaintext];
// HMAC uses MD5 digest algorithm
NSString *hmacMD5 = [GMSm3Utils hmac:GMHashType_MD5 key:randomKey plaintext:plaintext];
// HMAC uses SHA1 digest algorithm
NSString *hmacSHA1 = [GMSm3Utils hmac:GMHashType_SHA1 key:randomKey plaintext:plaintext];
// HMAC uses SHA224 digest algorithm
NSString *hmacSHA224 = [GMSm3Utils hmac:GMHashType_SHA224 key:randomKey plaintext:plaintext];
// HMAC uses SHA256 digest algorithm
NSString *hmacSHA256 = [GMSm3Utils hmac:GMHashType_SHA256 key:randomKey plaintext:plaintext];
// HMAC uses SHA384 digest algorithm
NSString *hmacSHA384 = [GMSm3Utils hmac:GMHashType_SHA384 key:randomKey plaintext:plaintext];
// HMAC uses SHA512 digest algorithm
NSString *hmacSHA512 = [GMSm3Utils hmac:GMHashType_SHA512 key:randomKey plaintext:plaintext];

// public key
NSString *pubKey = @"0408E3FFF9505BCFAF9307E665E9229F4E1B3936437A870407EA3D97886BAFBC9"
                    "C624537215DE9507BC0E2DD276CF74695C99DF42424F28E9004CDE4678F63D698";
// private key
NSString *prikey = @"90F3A42B9FE24AB196305FD92EC82E647616C3A3694441FB3422E7838E24DEAE";

// plaintext
NSString *plaintext = @"123456"; // ordinary plaintext
NSString *plainHex = @"313233343536"; // Hex format character plain text (The Hex code of 123456 is 313233343536)
NSData *plainData = [NSData dataWithBytes:"123456" length:6]; // NSData format plain text

// sm2 encryption result, ASN1 encoded cipher text
NSString *enResult1 = [GMSm2Utils encryptText:plaintext publicKey:pubKey]; // encrypt ordinary string
NSString *enResult2 = [GMSm2Utils encryptHex:plainHex publicKey:pubKey]; // Encrypted Hex encoding format string
NSData *enResult3 = [GMSm2Utils encryptData:plainData publicKey:pubKey]; // Encrypt NSData type data

// ASN1 decoding, decode the ciphertext in ASN1 encoding format string, array or NSData
NSString *c1c3c2Result1 = [GMSm2Utils asn1DecodeToC1C3C2:enResult1]; // Decode to c1c3c2 string
NSArray<NSString *> *c1c3c2Result2 = [GMSm2Utils asn1DecodeToC1C3C2Array:enResult2]; // decoded as @[c1,c3,c2]
NSData *c1c3c2Result3 = [GMSm2Utils asn1DecodeToC1C3C2Data:enResult3]; // decoded as data spliced ​​by c1c3c2

// ASN1 encoding, re-encoding the decoded c1c3c2 ciphertext into ASN1 format, which should be exactly the same as enResult1, enResult2, and enResult3
NSString *asn1Result1 = [GMSm2Utils asn1EncodeWithC1C3C2:c1c3c2Result1];
NSString *asn1Result2 = [GMSm2Utils asn1EncodeWithC1C3C2Array:c1c3c2Result2];
NSData *asn1Result3 = [GMSm2Utils asn1EncodeWithC1C3C2Data:c1c3c2Result3];

NSString *ciphertext = @"C1C2C3 Sequential ciphertext";
// Change the ciphertext in c1c2c3 order to c1c3c2 order
NSString *c1c3c2 = [GMSm2Utils convertC1C2C3ToC1C3C2:c1c2c3 hasPrefix:NO];
// ASN1 encoding, encoding the ciphertext in c1c3c2 order into ASN1 format
NSString *asn1Result = [GMSm2Utils asn1EncodeWithC1C3C2:c1c3c2];
// Decrypt to plain text string
NSString *deResult1 = [GMSm2Utils decryptToText:asn1Result privateKey:priKey]; 
// If necessary, you can change the ciphertext in c1c3c2 order to c1c2c3 order
NSString *c1c2c3 = [GMSm2Utils convertC1C3C2ToC1C2C3:c1c3c2 hasPrefix:NO];

NSArray *keyPair = [GMSm2Utils createKeyPair];
NSString *pubKey = keyPair[0]; // The public key at the beginning of 04, Hex encoding format
NSString *priKey = keyPair[1]; // Private key, Hex encoding format