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//
// WGEncryptUtil.m
// WGFcodeNotes
//
// Created by 白菜 on 2022/12/1.
// Copyright © 2022 WG. All rights reserved.
//
#import "WGEncrypt.h"
@implementation WGEncrypt
//下面两个方法 用项目中生成的证书进行
//公钥加密 通过公钥证书获取 path: .der格式的公钥文件路径
+(NSString *)encryptWithRSA:(NSString *)contentText publicKeyWithContentsOfFile:(NSString *)path {
NSData *contentData = [contentText dataUsingEncoding:NSUTF8StringEncoding];
//通过路径获取公钥
SecKeyRef publickKeyRef = [WGEncrypt getPublicKeyRefWithContentsOfFile:path];
NSData *encryptData = [WGEncrypt encryptData:contentData withKeyRef:publickKeyRef isSign:NO];
NSString *encryptStr = base64_encode_data(encryptData);
return encryptStr;
}
//私钥解密 通过私钥证书获取 path: .p12格式的私钥文件路径 password: 私钥文件密码
+(NSString *)decryptString:(NSString *)contentText privateKeyWithContentsOfFile:(NSString *)path password:(NSString *)password {
NSData *contentData = [[NSData alloc] initWithBase64EncodedString:contentText options:NSDataBase64DecodingIgnoreUnknownCharacters];
//通过路径获取私钥
SecKeyRef privateKeyRef = [WGEncrypt getPrivateKeyRefWithContentsOfFile:path password:password];
NSData *data = [WGEncrypt decryptData:contentData withKeyRef:privateKeyRef];
NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return ret;
}
//RSA加密 公钥字符串 https://github.com/ideawu/Objective-C-RSA
//---------------公钥加密/解密开始-------start----------
//MARK: 公钥加密 return base64编码字符串
+(NSString *)encryptWithRSA:(NSString *)contentText publicKey:(NSString *)key {
NSData *data = [WGEncrypt encryptWithRSAData:[contentText dataUsingEncoding:NSUTF8StringEncoding] publicKey:key];
NSString *ret = base64_encode_data(data);
return ret;
}
//MARK: 公钥加密 return NSData
+(NSData *)encryptWithRSAData:(NSData *)contentData publicKey:(NSString *)key {
if(!contentData || !key){
return nil;
}
SecKeyRef keyRef = [WGEncrypt addPublicKey:key];
return [WGEncrypt encryptData:contentData withKeyRef:keyRef isSign:NO];
}
//MARK: 公钥解密，将base64编码的字符串，解密为字符串（非base64编码）
+(NSString *)decryptWithRSA:(NSString *)contentText publieKey:(NSString *)key {
NSData *data = [[NSData alloc] initWithBase64EncodedString:contentText options:NSDataBase64DecodingIgnoreUnknownCharacters];
data = [WGEncrypt decryptWithRSAData:data publieKey:key];
NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return ret;
}
//MARK: 公钥解密 返回data
+(NSData *)decryptWithRSAData:(NSData *)contentData publieKey:(NSString *)key {
if(!contentData || !key){
return nil;
}
SecKeyRef keyRef = [WGEncrypt addPublicKey:key];
return [WGEncrypt decryptData:contentData withKeyRef:keyRef];
}
//---------------公钥加密/解密结束-------end----------
//---------------私钥加密/解密开始-------start----------
//MARK: 私钥加密 返回base64编码字符串
+(NSString *)encryptWithRSA:(NSString *)contentText privateKey:(NSString *)key {
NSData *data = [WGEncrypt encryptWithRSAData:[contentText dataUsingEncoding:NSUTF8StringEncoding] privateKey:key];
NSString *ret = base64_encode_data(data);
return ret;
}
//MARK: 私钥加密 返回data
+(NSData *)encryptWithRSAData:(NSData *)contentData privateKey:(NSString *)key {
if(!contentData || !key){
return nil;
}
SecKeyRef keyRef = [WGEncrypt addPrivateKey:key];
return [WGEncrypt encryptData:contentData withKeyRef:keyRef isSign:YES];
}
//MARK: 私钥解密，将base64编码的字符串，解密为字符串（非base64编码）
+(NSString *)decryptWithRSA:(NSString *)contentText privateKey:(NSString *)key {
NSData *data = [[NSData alloc] initWithBase64EncodedString:contentText options:NSDataBase64DecodingIgnoreUnknownCharacters];
data = [WGEncrypt decryptWithRSAData:data privateKey:key];
NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return ret;
}
//MARK: 私钥解密 返回data
+(NSData *)decryptWithRSAData:(NSData *)contentData privateKey:(NSString *)key {
if(!contentData || !key){
return nil;
}
SecKeyRef keyRef = [WGEncrypt addPrivateKey:key];
return [WGEncrypt decryptData:contentData withKeyRef:keyRef];
}
//---------------私钥加密/解密结束-------end----------
//MARK: 加密公共方法
+(NSData *)encryptData:(NSData *)data withKeyRef:(SecKeyRef) keyRef isSign:(BOOL)isSign {
const uint8_t *srcbuf = (const uint8_t *)[data bytes];
size_t srclen = (size_t)data.length;
size_t block_size = SecKeyGetBlockSize(keyRef) * sizeof(uint8_t);
void *outbuf = malloc(block_size);
size_t src_block_size = block_size - 11;
NSMutableData *ret = [[NSMutableData alloc] init];
for(int idx=0; idx<srclen; idx+=src_block_size){
size_t data_len = srclen - idx;
if(data_len > src_block_size){
data_len = src_block_size;
}
size_t outlen = block_size;
OSStatus status = noErr;
if (isSign) {
status = SecKeyRawSign(keyRef,
kSecPaddingPKCS1,
srcbuf + idx,
data_len,
outbuf,
&outlen
);
}else {
status = SecKeyEncrypt(keyRef,
kSecPaddingPKCS1,
srcbuf + idx,
data_len,
outbuf,
&outlen
);
}
if (status != 0) {
NSLog(@"SecKeyEncrypt fail. Error Code: %d", (int)status);
ret = nil;
break;
}else{
[ret appendBytes:outbuf length:outlen];
}
}
free(outbuf);
CFRelease(keyRef);
return ret;
}
//MARK: 解密公共方法
+(NSData *)decryptData:(NSData *)data withKeyRef:(SecKeyRef) keyRef{
const uint8_t *srcbuf = (const uint8_t *)[data bytes];
size_t srclen = (size_t)data.length;
size_t block_size = SecKeyGetBlockSize(keyRef) * sizeof(uint8_t);
UInt8 *outbuf = malloc(block_size);
size_t src_block_size = block_size;
NSMutableData *ret = [[NSMutableData alloc] init];
for(int idx=0; idx<srclen; idx+=src_block_size){
size_t data_len = srclen - idx;
if(data_len > src_block_size){
data_len = src_block_size;
}
size_t outlen = block_size;
OSStatus status = noErr;
status = SecKeyDecrypt(keyRef,
kSecPaddingNone,
srcbuf + idx,
data_len,
outbuf,
&outlen
);
if (status != 0) {
NSLog(@"SecKeyEncrypt fail. Error Code: %d", (int)status);
ret = nil;
break;
}else{
//the actual decrypted data is in the middle, locate it!
int idxFirstZero = -1;
int idxNextZero = (int)outlen;
for ( int i = 0; i < outlen; i++ ) {
if ( outbuf[i] == 0 ) {
if ( idxFirstZero < 0 ) {
idxFirstZero = i;
} else {
idxNextZero = i;
break;
}
}
}
[ret appendBytes:&outbuf[idxFirstZero+1] length:idxNextZero-idxFirstZero-1];
}
}
free(outbuf);
CFRelease(keyRef);
return ret;
}
//MARK: 通过公钥字符串获取公钥【SecKeyRef】
+(SecKeyRef)addPublicKey:(NSString *)key{
NSRange spos = [key rangeOfString:@"-----BEGIN PUBLIC KEY-----"];
NSRange epos = [key rangeOfString:@"-----END PUBLIC KEY-----"];
if(spos.location != NSNotFound && epos.location != NSNotFound){
NSUInteger s = spos.location + spos.length;
NSUInteger e = epos.location;
NSRange range = NSMakeRange(s, e-s);
key = [key substringWithRange:range];
}
key = [key stringByReplacingOccurrencesOfString:@"\r" withString:@""];
key = [key stringByReplacingOccurrencesOfString:@"\n" withString:@""];
key = [key stringByReplacingOccurrencesOfString:@"\t" withString:@""];
key = [key stringByReplacingOccurrencesOfString:@" " withString:@""];
// This will be base64 encoded, decode it.
NSData *data = base64_decode(key);
data = [WGEncrypt stripPublicKeyHeader:data];
if(!data){
return nil;
}
//a tag to read/write keychain storage
NSString *tag = @"RSAUtil_PubKey";
NSData *d_tag = [NSData dataWithBytes:[tag UTF8String] length:[tag length]];
// Delete any old lingering key with the same tag
NSMutableDictionary *publicKey = [[NSMutableDictionary alloc] init];
[publicKey setObject:(__bridge id) kSecClassKey forKey:(__bridge id)kSecClass];
[publicKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
[publicKey setObject:d_tag forKey:(__bridge id)kSecAttrApplicationTag];
SecItemDelete((__bridge CFDictionaryRef)publicKey);
// Add persistent version of the key to system keychain
[publicKey setObject:data forKey:(__bridge id)kSecValueData];
[publicKey setObject:(__bridge id) kSecAttrKeyClassPublic forKey:(__bridge id)
kSecAttrKeyClass];
[publicKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)
kSecReturnPersistentRef];
CFTypeRef persistKey = nil;
OSStatus status = SecItemAdd((__bridge CFDictionaryRef)publicKey, &persistKey);
if (persistKey != nil){
CFRelease(persistKey);
}
if ((status != noErr) && (status != errSecDuplicateItem)) {
return nil;
}
[publicKey removeObjectForKey:(__bridge id)kSecValueData];
[publicKey removeObjectForKey:(__bridge id)kSecReturnPersistentRef];
[publicKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];
[publicKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
// Now fetch the SecKeyRef version of the key
SecKeyRef keyRef = nil;
status = SecItemCopyMatching((__bridge CFDictionaryRef)publicKey, (CFTypeRef *)&keyRef);
if(status != noErr){
return nil;
}
return keyRef;
}
//MARK: 通过公钥文件(.der)在项目中的路径获取公钥【SecKeyRef】
+(SecKeyRef)getPublicKeyRefWithContentsOfFile:(NSString *)filePath{
NSData *certData = [NSData dataWithContentsOfFile:filePath];
if (!certData) {
return nil;
}
SecCertificateRef cert = SecCertificateCreateWithData(NULL, (CFDataRef)certData);
SecKeyRef key = NULL;
SecTrustRef trust = NULL;
SecPolicyRef policy = NULL;
if (cert != NULL) {
policy = SecPolicyCreateBasicX509();
if (policy) {
if (SecTrustCreateWithCertificates((CFTypeRef)cert, policy, &trust) == noErr) {
SecTrustResultType result;
if (SecTrustEvaluate(trust, &result) == noErr) {
key = SecTrustCopyPublicKey(trust);
}
}
}
}
if (policy) CFRelease(policy);
if (trust) CFRelease(trust);
if (cert) CFRelease(cert);
return key;
}
//MARK: 通过私钥字符串获取私钥类型【SecKeyRef】
+(SecKeyRef)addPrivateKey:(NSString *)key{
NSRange spos;
NSRange epos;
spos = [key rangeOfString:@"-----BEGIN RSA PRIVATE KEY-----"];
if(spos.length > 0){
epos = [key rangeOfString:@"-----END RSA PRIVATE KEY-----"];
}else{
spos = [key rangeOfString:@"-----BEGIN PRIVATE KEY-----"];
epos = [key rangeOfString:@"-----END PRIVATE KEY-----"];
}
if(spos.location != NSNotFound && epos.location != NSNotFound){
NSUInteger s = spos.location + spos.length;
NSUInteger e = epos.location;
NSRange range = NSMakeRange(s, e-s);
key = [key substringWithRange:range];
}
key = [key stringByReplacingOccurrencesOfString:@"\r" withString:@""];
key = [key stringByReplacingOccurrencesOfString:@"\n" withString:@""];
key = [key stringByReplacingOccurrencesOfString:@"\t" withString:@""];
key = [key stringByReplacingOccurrencesOfString:@" " withString:@""];
// This will be base64 encoded, decode it.
NSData *data = base64_decode(key);
data = [WGEncrypt stripPrivateKeyHeader:data];
if(!data){
return nil;
}
//a tag to read/write keychain storage
NSString *tag = @"RSAUtil_PrivKey";
NSData *d_tag = [NSData dataWithBytes:[tag UTF8String] length:[tag length]];
// Delete any old lingering key with the same tag
NSMutableDictionary *privateKey = [[NSMutableDictionary alloc] init];
[privateKey setObject:(__bridge id) kSecClassKey forKey:(__bridge id)kSecClass];
[privateKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
[privateKey setObject:d_tag forKey:(__bridge id)kSecAttrApplicationTag];
SecItemDelete((__bridge CFDictionaryRef)privateKey);
// Add persistent version of the key to system keychain
[privateKey setObject:data forKey:(__bridge id)kSecValueData];
[privateKey setObject:(__bridge id) kSecAttrKeyClassPrivate forKey:(__bridge id)
kSecAttrKeyClass];
[privateKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)
kSecReturnPersistentRef];
CFTypeRef persistKey = nil;
OSStatus status = SecItemAdd((__bridge CFDictionaryRef)privateKey, &persistKey);
if (persistKey != nil){
CFRelease(persistKey);
}
if ((status != noErr) && (status != errSecDuplicateItem)) {
return nil;
}
[privateKey removeObjectForKey:(__bridge id)kSecValueData];
[privateKey removeObjectForKey:(__bridge id)kSecReturnPersistentRef];
[privateKey setObject:[NSNumber numberWithBool:YES] forKey:(__bridge id)kSecReturnRef];
[privateKey setObject:(__bridge id) kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
// Now fetch the SecKeyRef version of the key
SecKeyRef keyRef = nil;
status = SecItemCopyMatching((__bridge CFDictionaryRef)privateKey, (CFTypeRef *)&keyRef);
if(status != noErr){
return nil;
}
return keyRef;
}
//MARK: 通过私钥文件(.p12)的路径获取私钥类型【SecKeyRef】
+(SecKeyRef)getPrivateKeyRefWithContentsOfFile:(NSString *)filePath password:(NSString*)password{
NSData *p12Data = [NSData dataWithContentsOfFile:filePath];
if (!p12Data) {
return nil;
}
SecKeyRef privateKeyRef = NULL;
NSMutableDictionary * options = [[NSMutableDictionary alloc] init];
[options setObject: password forKey:(__bridge id)kSecImportExportPassphrase];
CFArrayRef items = CFArrayCreate(NULL, 0, 0, NULL);
OSStatus securityError = SecPKCS12Import((__bridge CFDataRef) p12Data, (__bridge CFDictionaryRef)options, &items);
if (securityError == noErr && CFArrayGetCount(items) > 0) {
CFDictionaryRef identityDict = CFArrayGetValueAtIndex(items, 0);
SecIdentityRef identityApp = (SecIdentityRef)CFDictionaryGetValue(identityDict, kSecImportItemIdentity);
securityError = SecIdentityCopyPrivateKey(identityApp, &privateKeyRef);
if (securityError != noErr) {
privateKeyRef = NULL;
}
}
CFRelease(items);
return privateKeyRef;
}
+(NSData *)stripPublicKeyHeader:(NSData *)d_key{
// Skip ASN.1 public key header
if (d_key == nil) return(nil);
unsigned long len = [d_key length];
if (!len) return(nil);
unsigned char *c_key = (unsigned char *)[d_key bytes];
unsigned int idx = 0;
if (c_key[idx++] != 0x30) return(nil);
if (c_key[idx] > 0x80) idx += c_key[idx] - 0x80 + 1;
else idx++;
// PKCS #1 rsaEncryption szOID_RSA_RSA
static unsigned char seqiod[] =
{ 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01,
0x01, 0x05, 0x00 };
if (memcmp(&c_key[idx], seqiod, 15)) return(nil);
idx += 15;
if (c_key[idx++] != 0x03) return(nil);
if (c_key[idx] > 0x80) idx += c_key[idx] - 0x80 + 1;
else idx++;
if (c_key[idx++] != '\0') return(nil);
// Now make a new NSData from this buffer
return([NSData dataWithBytes:&c_key[idx] length:len - idx]);
}
//credit: http://hg.mozilla.org/services/fx-home/file/tip/Sources/NetworkAndStorage/CryptoUtils.m#l1036
+(NSData *)stripPrivateKeyHeader:(NSData *)d_key{
// Skip ASN.1 private key header
if (d_key == nil) return(nil);
unsigned long len = [d_key length];
if (!len) return(nil);
unsigned char *c_key = (unsigned char *)[d_key bytes];
unsigned int idx = 22; //magic byte at offset 22
if (0x04 != c_key[idx++]) return nil;
//calculate length of the key
unsigned int c_len = c_key[idx++];
int det = c_len & 0x80;
if (!det) {
c_len = c_len & 0x7f;
} else {
int byteCount = c_len & 0x7f;
if (byteCount + idx > len) {
//rsa length field longer than buffer
return nil;
}
unsigned int accum = 0;
unsigned char *ptr = &c_key[idx];
idx += byteCount;
while (byteCount) {
accum = (accum << 8) + *ptr;
ptr++;
byteCount--;
}
c_len = accum;
}
// Now make a new NSData from this buffer
return [d_key subdataWithRange:NSMakeRange(idx, c_len)];
}
static NSString *base64_encode_data(NSData *data){
data = [data base64EncodedDataWithOptions:0];
NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return ret;
}
static NSData *base64_decode(NSString *str){
NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
return data;
}
@end