ios下使用SHA1WithRSA算法加签与java后台验签配合demo

看见这边文章的同学太有眼福了，前段时间搞这个SHA1WithRSA 的 数据加签的功能，这个方面的资料很少，查看了好多资料搞的我很蛋疼啊，在知识的海洋中遨游了好久，最终用了九牛二虎之力搞定了。哈哈！

首先加入头文件

#import <CommonCrypto/CommonDigest.h>  

#import <CommonCrypto/CommonCryptor.h>

#import <Security/Security.h>

#import "NSData+Base64.h"

#define kChosenDigestLength CC_SHA1_DIGEST_LENGTH  // SHA-1消息摘要的数据位数160位 

- (NSData *)getHashBytes:(NSData *)plainText {
CC_SHA1_CTX ctx;
uint8_t * hashBytes = NULL;
NSData * hash = nil;

// Malloc a buffer to hold hash.
hashBytes = malloc( kChosenDigestLength * sizeof(uint8_t) );
memset((void *)hashBytes, 0x0, kChosenDigestLength);
// Initialize the context.
CC_SHA1_Init(&ctx);
// Perform the hash.
CC_SHA1_Update(&ctx, (void *)[plainText bytes], [plainText length]);
// Finalize the output.
CC_SHA1_Final(hashBytes, &ctx);

// Build up the SHA1 blob.
hash = [NSData dataWithBytes:(const void *)hashBytes length:(NSUInteger)kChosenDigestLength];
if (hashBytes) free(hashBytes);

return hash;
}

-(NSString *)signTheDataSHA1WithRSA:(NSString *)plainText
{
    uint8_t* signedBytes = NULL;
    size_t signedBytesSize = 0;
    OSStatus sanityCheck = noErr;
    NSData* signedHash = nil;

    NSString * path = [[NSBundle mainBundle]pathForResource:@"keystore" ofType:@"p12"];
    NSData * data = [NSData dataWithContentsOfFile:path];
    NSMutableDictionary * options = [[NSMutableDictionary alloc] init]; // Set the private key query dictionary.
    [options setObject:@"你的p12文件的密码" forKey:(id)kSecImportExportPassphrase];
    CFArrayRef items = CFArrayCreate(NULL, 0, 0, NULL);
    OSStatus securityError = SecPKCS12Import((CFDataRef) data, (CFDictionaryRef)options, &items);
    if (securityError!=noErr) {
        return nil ;
    }
    CFDictionaryRef identityDict = CFArrayGetValueAtIndex(items, 0);
    SecIdentityRef identityApp =(SecIdentityRef)CFDictionaryGetValue(identityDict,kSecImportItemIdentity); 
    SecKeyRef privateKeyRef=nil;
    SecIdentityCopyPrivateKey(identityApp, &privateKeyRef);
    signedBytesSize = SecKeyGetBlockSize(privateKeyRef);

    NSData *plainTextBytes = [plainText dataUsingEncoding:NSUTF8StringEncoding];

    signedBytes = malloc( signedBytesSize * sizeof(uint8_t) ); // Malloc a buffer to hold signature.
    memset((void *)signedBytes, 0x0, signedBytesSize);

    sanityCheck = SecKeyRawSign(privateKeyRef,
                                kSecPaddingPKCS1SHA1,
                                (const uint8_t *)[[self getHashBytes:plainTextBytes] bytes],
                                kChosenDigestLength,
                                (uint8_t *)signedBytes,
                                &signedBytesSize);   

    if (sanityCheck == noErr)
    {
        signedHash = [NSData dataWithBytes:(const void *)signedBytes length:(NSUInteger)signedBytesSize];
    }
    else
    {
        return nil;
    }

    if (signedBytes)
    {
        free(signedBytes);
    }
    NSString *signatureResult=[NSString stringWithFormat:@"%@",[signedHash base64EncodedString]];
    return signatureResult;
}

在服务器端的java验签方法明天上传。哈哈！请看http://blog.csdn.net/jinglijun/article/details/7791032