RSA用秘钥签名与验签 加密解密
2016-07-05 09:53
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一 .下载openssl文件 导入
二.新建类代码如下
#import <Foundation/Foundation.h>
typedef enum {
KeyTypePublic = 0,
KeyTypePrivate
}KeyType;
@interface HBRSAHandler : NSObject
- (BOOL)importKeyWithType:(KeyType)type andPath:(NSString*)path;
- (BOOL)importKeyWithType:(KeyType)type andkeyString:(NSString *)keyString;
//验证签名 Sha1 + RSA
- (BOOL)verifyString:(NSString *)string withSign:(NSString *)signString;
//验证签名 md5 + RSA
- (BOOL)verifyMD5String:(NSString *)string withSign:(NSString *)signString;
- (NSString *)signString:(NSString *)string;
- (NSString *)signMD5String:(NSString *)string;
- (NSString *) encryptWithPublicKey:(NSString*)content;
- (NSString *) decryptWithPrivatecKey:(NSString*)content;
@end
#import "HBRSAHandler.h"
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/md5.h>
typedef enum {
RSA_PADDING_TYPE_NONE = RSA_NO_PADDING,
RSA_PADDING_TYPE_PKCS1 = RSA_PKCS1_PADDING,
RSA_PADDING_TYPE_SSLV23 = RSA_SSLV23_PADDING
}RSA_PADDING_TYPE;
#define PADDING RSA_PADDING_TYPE_PKCS1
@implementation HBRSAHandler
{
RSA* _rsa_pub;
RSA* _rsa_pri;
}
#pragma mark - public methord
-(BOOL)importKeyWithType:(KeyType)type andPath:(NSString *)path
{
BOOL status =
NO;
const char* cPath = [pathcStringUsingEncoding:NSUTF8StringEncoding];
FILE* file =
fopen(cPath, "rb");
if (!file) {
return status;
}
if (type ==
KeyTypePublic) {
_rsa_pub =
NULL;
if((_rsa_pub =PEM_read_RSA_PUBKEY(file,
NULL,NULL,
NULL))){
status = YES;
}
}else if(type ==KeyTypePrivate){
_rsa_pri =
NULL;
if ((_rsa_pri =PEM_read_RSAPrivateKey(file,
NULL,NULL,
NULL))) {
status = YES;
}
}
fclose(file);
return status;
}
- (BOOL)importKeyWithType:(KeyType)type andkeyString:(NSString *)keyString
{
if (!keyString) {
return
NO;
}
BOOL status =
NO;
BIO *bio =
NULL;
RSA *rsa =
NULL;
bio = BIO_new(BIO_s_file());
NSString* temPath =NSTemporaryDirectory();
NSString* rsaFilePath = [temPathstringByAppendingPathComponent:@"RSAKEY"];
NSString* formatRSAKeyString = [selfformatRSAKeyWithKeyString:keyString
andKeytype:type];
BOOL writeSuccess = [formatRSAKeyStringwriteToFile:rsaFilePath
atomically:YESencoding:NSUTF8StringEncodingerror:nil];
if (!writeSuccess) {
return
NO;
}
const char* cPath = [rsaFilePathcStringUsingEncoding:NSUTF8StringEncoding];
BIO_read_filename(bio, cPath);
if (type ==
KeyTypePrivate) {
rsa = PEM_read_bio_RSAPrivateKey(bio,NULL,
NULL,"");
_rsa_pri = rsa;
if (rsa !=
NULL && 1 ==RSA_check_key(rsa)) {
status = YES;
} else {
status = NO;
}
}
else{
rsa = PEM_read_bio_RSA_PUBKEY(bio,NULL,
NULL,NULL);
_rsa_pub = rsa;
if (rsa !=
NULL) {
status = YES;
} else {
status = NO;
}
}
BIO_free_all(bio);
[[NSFileManager
defaultManager] removeItemAtPath:rsaFilePatherror:nil];
return status;
}
#pragma mark RSA sha1验证签名
//signString为base64字符串
- (BOOL)verifyString:(NSString *)string withSign:(NSString *)signString
{
if (!_rsa_pub) {
NSLog(@"please import public key first");
return
NO;
}
const char *message = [stringcStringUsingEncoding:NSUTF8StringEncoding];
int messageLength = (int)[stringlengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSData *signatureData = [[NSDataalloc]initWithBase64EncodedString:signStringoptions:0];
unsigned char *sig = (unsignedchar *)[signatureData
bytes];
unsigned int sig_len = (int)[signatureDatalength];
unsigned char sha1[20];
SHA1((unsignedchar *)message, messageLength, sha1);
int verify_ok =RSA_verify(NID_sha1
, sha1, 20
, sig, sig_len
, _rsa_pub);
if (1 == verify_ok){
return
YES;
}
return NO;
}
#pragma mark RSA MD5 验证签名
- (BOOL)verifyMD5String:(NSString *)string withSign:(NSString *)signString
{
if (!_rsa_pub) {
NSLog(@"please import public key first");
return
NO;
}
const char *message = [stringcStringUsingEncoding:NSUTF8StringEncoding];
// int messageLength = (int)[string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSData *signatureData = [[NSDataalloc]initWithBase64EncodedString:signStringoptions:0];
unsigned char *sig = (unsignedchar *)[signatureData
bytes];
unsigned int sig_len = (int)[signatureDatalength];
unsigned char digest[MD5_DIGEST_LENGTH];
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, message,strlen(message));
MD5_Final(digest, &ctx);
int verify_ok =
RSA_verify(NID_md5
, digest, MD5_DIGEST_LENGTH
, sig, sig_len
, _rsa_pub);
if (1 == verify_ok){
return
YES;
}
return NO;
}
- (NSString *)signString:(NSString *)string
{
if (!_rsa_pri) {
NSLog(@"please import private key first");
return
nil;
}
const char *message = [stringcStringUsingEncoding:NSUTF8StringEncoding];
int messageLength = (int)strlen(message);
unsigned char *sig = (unsignedchar *)malloc(256);
unsigned int sig_len;
unsigned char sha1[20];
SHA1((unsignedchar *)message, messageLength, sha1);
int rsa_sign_valid =RSA_sign(NID_sha1
, sha1, 20
, sig, &sig_len
, _rsa_pri);
if (rsa_sign_valid ==1) {
NSData* data = [NSDatadataWithBytes:sig
length:sig_len];
NSString * base64String = [database64EncodedStringWithOptions:0];
free(sig);
return base64String;
}
free(sig);
return nil;
}
- (NSString *)signMD5String:(NSString *)string
{
if (!_rsa_pri) {
NSLog(@"please import private key first");
return
nil;
}
const char *message = [stringcStringUsingEncoding:NSUTF8StringEncoding];
//int messageLength = (int)strlen(message);
unsigned char *sig = (unsignedchar *)malloc(256);
unsigned int sig_len;
unsigned char digest[MD5_DIGEST_LENGTH];
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, message,strlen(message));
MD5_Final(digest, &ctx);
int rsa_sign_valid =RSA_sign(NID_md5
, digest, MD5_DIGEST_LENGTH
, sig, &sig_len
, _rsa_pri);
if (rsa_sign_valid ==1) {
NSData* data = [NSDatadataWithBytes:sig
length:sig_len];
NSString * base64String = [database64EncodedStringWithOptions:0];
free(sig);
return base64String;
}
free(sig);
return nil;
}
- (NSString *) encryptWithPublicKey:(NSString*)content
{
if (!_rsa_pub) {
NSLog(@"please import public key first");
return
nil;
}
int status;
int length = (int)[contentlength];
unsigned char input[length +1];
bzero(input, length +1);
int i = 0;
for (; i < length; i++)
{
input[i] = [content characterAtIndex:i];
}
NSInteger flen = [selfgetBlockSizeWithRSA_PADDING_TYPE:PADDINGandRSA:_rsa_pub];
char *encData = (char*)malloc(flen);
bzero(encData, flen);
status = RSA_public_encrypt(length, (unsignedchar*)input, (unsignedchar*)encData,
_rsa_pub,PADDING);
if (status){
NSData *returnData = [NSDatadataWithBytes:encData
length:status];
free(encData);
encData = NULL;
//NSString *ret = [returnData base64EncodedString];
NSString *ret = [returnDatabase64EncodedStringWithOptions:
NSDataBase64Encoding64CharacterLineLength];
return ret;
}
free(encData);
encData = NULL;
return nil;
}
- (NSString *) decryptWithPrivatecKey:(NSString*)content
{
if (!_rsa_pri) {
NSLog(@"please import private key first");
return
nil;
} int status;
//NSData *data = [content base64DecodedData];
NSData *data = [[NSDataalloc]initWithBase64EncodedString:contentoptions:NSDataBase64DecodingIgnoreUnknownCharacters];
int length = (int)[datalength];
NSInteger flen = [selfgetBlockSizeWithRSA_PADDING_TYPE:PADDINGandRSA:_rsa_pri];
char *decData = (char*)malloc(flen);
bzero(decData, flen);
status = RSA_private_decrypt(length, (unsignedchar*)[data
bytes], (unsignedchar*)decData,
_rsa_pri,PADDING);
if (status)
{
NSMutableString *decryptString = [[NSMutableStringalloc]
initWithBytes:decDatalength:strlen(decData)encoding:NSASCIIStringEncoding];
free(decData);
decData = NULL;
return decryptString;
}
free(decData);
decData = NULL;
return nil;
}
- (int)getBlockSizeWithRSA_PADDING_TYPE:(RSA_PADDING_TYPE)padding_type andRSA:(RSA*)rsa
{
int len = RSA_size(rsa);
if (padding_type ==RSA_PADDING_TYPE_PKCS1 || padding_type ==RSA_PADDING_TYPE_SSLV23) {
len -= 11;
}
return len;
}
-(NSString*)formatRSAKeyWithKeyString:(NSString*)keyString andKeytype:(KeyType)type
{
NSInteger lineNum = -1;
NSMutableString *result = [NSMutableStringstring];
if (type ==
KeyTypePrivate) {
[result appendString:@"-----BEGIN PRIVATE KEY-----\n"];
lineNum = 79;
}else if(type ==KeyTypePublic){
[result appendString:@"-----BEGIN PUBLIC KEY-----\n"];
lineNum = 76;
}
int count =
0;
for (int i =0; i < [keyString
length]; ++i) {
unichar c = [keyStringcharacterAtIndex:i];
if (c ==
'\n' || c == '\r') {
continue;
}
[result appendFormat:@"%c", c];
if (++count == lineNum) {
[result appendString:@"\n"];
count = 0;
}
}
if (type ==
KeyTypePrivate) {
[result appendString:@"\n-----END PRIVATE KEY-----"];
}else if(type ==KeyTypePublic){
[result appendString:@"\n-----END PUBLIC KEY-----"];
}
return result;
}
@end
实现:
NSString *str=@"hdshgj";
NSString *publicKeyFilePath = [[NSBundlemainBundle]
pathForResource:@"public_key.pem"ofType:nil];
NSString *privateKeyFilePath = [[NSBundlemainBundle]
pathForResource:@"private_key.pem"ofType:nil];
HBRSAHandler* handler = [HBRSAHandlernew];
[handler importKeyWithType:KeyTypePublicandPath:publicKeyFilePath];
[handler importKeyWithType:KeyTypePrivateandPath:privateKeyFilePath];
NSString* result = [handlerencryptWithPublicKey:str];
NSLog(@"加密%@",result);
NSString* resign = [handlersignString:str];
NSLog(@"签名%@",resign);
NSString* result2 = [handlerdecryptWithPrivatecKey:result];
NSLog(@"解密%@",result2);
BOOL result3 = [handlerverifyString:str
withSign:resign];
NSLog(@"验证签名结果%@",[NSStringstringWithFormat:@"验证签名结果(1成功，0失败)：
%d",result3]);
如果报错找不到Openssl 请在Build Settings——Hearder search Paths中配置其地址
导入文件 lib crypto.a 与 libel.a
二.新建类代码如下
#import <Foundation/Foundation.h>
typedef enum {
KeyTypePublic = 0,
KeyTypePrivate
}KeyType;
@interface HBRSAHandler : NSObject
- (BOOL)importKeyWithType:(KeyType)type andPath:(NSString*)path;
- (BOOL)importKeyWithType:(KeyType)type andkeyString:(NSString *)keyString;
//验证签名 Sha1 + RSA
- (BOOL)verifyString:(NSString *)string withSign:(NSString *)signString;
//验证签名 md5 + RSA
- (BOOL)verifyMD5String:(NSString *)string withSign:(NSString *)signString;
- (NSString *)signString:(NSString *)string;
- (NSString *)signMD5String:(NSString *)string;
- (NSString *) encryptWithPublicKey:(NSString*)content;
- (NSString *) decryptWithPrivatecKey:(NSString*)content;
@end
#import "HBRSAHandler.h"
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/md5.h>
typedef enum {
RSA_PADDING_TYPE_NONE = RSA_NO_PADDING,
RSA_PADDING_TYPE_PKCS1 = RSA_PKCS1_PADDING,
RSA_PADDING_TYPE_SSLV23 = RSA_SSLV23_PADDING
}RSA_PADDING_TYPE;
#define PADDING RSA_PADDING_TYPE_PKCS1
@implementation HBRSAHandler
{
RSA* _rsa_pub;
RSA* _rsa_pri;
}
#pragma mark - public methord
-(BOOL)importKeyWithType:(KeyType)type andPath:(NSString *)path
{
BOOL status =
NO;
const char* cPath = [pathcStringUsingEncoding:NSUTF8StringEncoding];
FILE* file =
fopen(cPath, "rb");
if (!file) {
return status;
}
if (type ==
KeyTypePublic) {
_rsa_pub =
NULL;
if((_rsa_pub =PEM_read_RSA_PUBKEY(file,
NULL,NULL,
NULL))){
status = YES;
}
}else if(type ==KeyTypePrivate){
_rsa_pri =
NULL;
if ((_rsa_pri =PEM_read_RSAPrivateKey(file,
NULL,NULL,
NULL))) {
status = YES;
}
}
fclose(file);
return status;
}
- (BOOL)importKeyWithType:(KeyType)type andkeyString:(NSString *)keyString
{
if (!keyString) {
return
NO;
}
BOOL status =
NO;
BIO *bio =
NULL;
RSA *rsa =
NULL;
bio = BIO_new(BIO_s_file());
NSString* temPath =NSTemporaryDirectory();
NSString* rsaFilePath = [temPathstringByAppendingPathComponent:@"RSAKEY"];
NSString* formatRSAKeyString = [selfformatRSAKeyWithKeyString:keyString
andKeytype:type];
BOOL writeSuccess = [formatRSAKeyStringwriteToFile:rsaFilePath
atomically:YESencoding:NSUTF8StringEncodingerror:nil];
if (!writeSuccess) {
return
NO;
}
const char* cPath = [rsaFilePathcStringUsingEncoding:NSUTF8StringEncoding];
BIO_read_filename(bio, cPath);
if (type ==
KeyTypePrivate) {
rsa = PEM_read_bio_RSAPrivateKey(bio,NULL,
NULL,"");
_rsa_pri = rsa;
if (rsa !=
NULL && 1 ==RSA_check_key(rsa)) {
status = YES;
} else {
status = NO;
}
}
else{
rsa = PEM_read_bio_RSA_PUBKEY(bio,NULL,
NULL,NULL);
_rsa_pub = rsa;
if (rsa !=
NULL) {
status = YES;
} else {
status = NO;
}
}
BIO_free_all(bio);
[[NSFileManager
defaultManager] removeItemAtPath:rsaFilePatherror:nil];
return status;
}
#pragma mark RSA sha1验证签名
//signString为base64字符串
- (BOOL)verifyString:(NSString *)string withSign:(NSString *)signString
{
if (!_rsa_pub) {
NSLog(@"please import public key first");
return
NO;
}
const char *message = [stringcStringUsingEncoding:NSUTF8StringEncoding];
int messageLength = (int)[stringlengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSData *signatureData = [[NSDataalloc]initWithBase64EncodedString:signStringoptions:0];
unsigned char *sig = (unsignedchar *)[signatureData
bytes];
unsigned int sig_len = (int)[signatureDatalength];
unsigned char sha1[20];
SHA1((unsignedchar *)message, messageLength, sha1);
int verify_ok =RSA_verify(NID_sha1
, sha1, 20
, sig, sig_len
, _rsa_pub);
if (1 == verify_ok){
return
YES;
}
return NO;
}
#pragma mark RSA MD5 验证签名
- (BOOL)verifyMD5String:(NSString *)string withSign:(NSString *)signString
{
if (!_rsa_pub) {
NSLog(@"please import public key first");
return
NO;
}
const char *message = [stringcStringUsingEncoding:NSUTF8StringEncoding];
// int messageLength = (int)[string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
NSData *signatureData = [[NSDataalloc]initWithBase64EncodedString:signStringoptions:0];
unsigned char *sig = (unsignedchar *)[signatureData
bytes];
unsigned int sig_len = (int)[signatureDatalength];
unsigned char digest[MD5_DIGEST_LENGTH];
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, message,strlen(message));
MD5_Final(digest, &ctx);
int verify_ok =
RSA_verify(NID_md5
, digest, MD5_DIGEST_LENGTH
, sig, sig_len
, _rsa_pub);
if (1 == verify_ok){
return
YES;
}
return NO;
}
- (NSString *)signString:(NSString *)string
{
if (!_rsa_pri) {
NSLog(@"please import private key first");
return
nil;
}
const char *message = [stringcStringUsingEncoding:NSUTF8StringEncoding];
int messageLength = (int)strlen(message);
unsigned char *sig = (unsignedchar *)malloc(256);
unsigned int sig_len;
unsigned char sha1[20];
SHA1((unsignedchar *)message, messageLength, sha1);
int rsa_sign_valid =RSA_sign(NID_sha1
, sha1, 20
, sig, &sig_len
, _rsa_pri);
if (rsa_sign_valid ==1) {
NSData* data = [NSDatadataWithBytes:sig
length:sig_len];
NSString * base64String = [database64EncodedStringWithOptions:0];
free(sig);
return base64String;
}
free(sig);
return nil;
}
- (NSString *)signMD5String:(NSString *)string
{
if (!_rsa_pri) {
NSLog(@"please import private key first");
return
nil;
}
const char *message = [stringcStringUsingEncoding:NSUTF8StringEncoding];
//int messageLength = (int)strlen(message);
unsigned char *sig = (unsignedchar *)malloc(256);
unsigned int sig_len;
unsigned char digest[MD5_DIGEST_LENGTH];
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, message,strlen(message));
MD5_Final(digest, &ctx);
int rsa_sign_valid =RSA_sign(NID_md5
, digest, MD5_DIGEST_LENGTH
, sig, &sig_len
, _rsa_pri);
if (rsa_sign_valid ==1) {
NSData* data = [NSDatadataWithBytes:sig
length:sig_len];
NSString * base64String = [database64EncodedStringWithOptions:0];
free(sig);
return base64String;
}
free(sig);
return nil;
}
- (NSString *) encryptWithPublicKey:(NSString*)content
{
if (!_rsa_pub) {
NSLog(@"please import public key first");
return
nil;
}
int status;
int length = (int)[contentlength];
unsigned char input[length +1];
bzero(input, length +1);
int i = 0;
for (; i < length; i++)
{
input[i] = [content characterAtIndex:i];
}
NSInteger flen = [selfgetBlockSizeWithRSA_PADDING_TYPE:PADDINGandRSA:_rsa_pub];
char *encData = (char*)malloc(flen);
bzero(encData, flen);
status = RSA_public_encrypt(length, (unsignedchar*)input, (unsignedchar*)encData,
_rsa_pub,PADDING);
if (status){
NSData *returnData = [NSDatadataWithBytes:encData
length:status];
free(encData);
encData = NULL;
//NSString *ret = [returnData base64EncodedString];
NSString *ret = [returnDatabase64EncodedStringWithOptions:
NSDataBase64Encoding64CharacterLineLength];
return ret;
}
free(encData);
encData = NULL;
return nil;
}
- (NSString *) decryptWithPrivatecKey:(NSString*)content
{
if (!_rsa_pri) {
NSLog(@"please import private key first");
return
nil;
} int status;
//NSData *data = [content base64DecodedData];
NSData *data = [[NSDataalloc]initWithBase64EncodedString:contentoptions:NSDataBase64DecodingIgnoreUnknownCharacters];
int length = (int)[datalength];
NSInteger flen = [selfgetBlockSizeWithRSA_PADDING_TYPE:PADDINGandRSA:_rsa_pri];
char *decData = (char*)malloc(flen);
bzero(decData, flen);
status = RSA_private_decrypt(length, (unsignedchar*)[data
bytes], (unsignedchar*)decData,
_rsa_pri,PADDING);
if (status)
{
NSMutableString *decryptString = [[NSMutableStringalloc]
initWithBytes:decDatalength:strlen(decData)encoding:NSASCIIStringEncoding];
free(decData);
decData = NULL;
return decryptString;
}
free(decData);
decData = NULL;
return nil;
}
- (int)getBlockSizeWithRSA_PADDING_TYPE:(RSA_PADDING_TYPE)padding_type andRSA:(RSA*)rsa
{
int len = RSA_size(rsa);
if (padding_type ==RSA_PADDING_TYPE_PKCS1 || padding_type ==RSA_PADDING_TYPE_SSLV23) {
len -= 11;
}
return len;
}
-(NSString*)formatRSAKeyWithKeyString:(NSString*)keyString andKeytype:(KeyType)type
{
NSInteger lineNum = -1;
NSMutableString *result = [NSMutableStringstring];
if (type ==
KeyTypePrivate) {
[result appendString:@"-----BEGIN PRIVATE KEY-----\n"];
lineNum = 79;
}else if(type ==KeyTypePublic){
[result appendString:@"-----BEGIN PUBLIC KEY-----\n"];
lineNum = 76;
}
int count =
0;
for (int i =0; i < [keyString
length]; ++i) {
unichar c = [keyStringcharacterAtIndex:i];
if (c ==
'\n' || c == '\r') {
continue;
}
[result appendFormat:@"%c", c];
if (++count == lineNum) {
[result appendString:@"\n"];
count = 0;
}
}
if (type ==
KeyTypePrivate) {
[result appendString:@"\n-----END PRIVATE KEY-----"];
}else if(type ==KeyTypePublic){
[result appendString:@"\n-----END PUBLIC KEY-----"];
}
return result;
}
@end
实现:
NSString *str=@"hdshgj";
NSString *publicKeyFilePath = [[NSBundlemainBundle]
pathForResource:@"public_key.pem"ofType:nil];
NSString *privateKeyFilePath = [[NSBundlemainBundle]
pathForResource:@"private_key.pem"ofType:nil];
HBRSAHandler* handler = [HBRSAHandlernew];
[handler importKeyWithType:KeyTypePublicandPath:publicKeyFilePath];
[handler importKeyWithType:KeyTypePrivateandPath:privateKeyFilePath];
NSString* result = [handlerencryptWithPublicKey:str];
NSLog(@"加密%@",result);
NSString* resign = [handlersignString:str];
NSLog(@"签名%@",resign);
NSString* result2 = [handlerdecryptWithPrivatecKey:result];
NSLog(@"解密%@",result2);
BOOL result3 = [handlerverifyString:str
withSign:resign];
NSLog(@"验证签名结果%@",[NSStringstringWithFormat:@"验证签名结果(1成功，0失败)：
%d",result3]);
如果报错找不到Openssl 请在Build Settings——Hearder search Paths中配置其地址
导入文件 lib crypto.a 与 libel.a
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