MD5 加密的简单封装

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+ (NSString *)getmd5WithString:(NSString *)string{

const char* original_str=[string UTF8String];

unsigned char digist[CC_MD5_DIGEST_LENGTH]; //CC_MD5_DIGEST_LENGTH = 16

CC_MD5(original_str, strlen(original_str), digist);

NSMutableString* outPutStr = [NSMutableString stringWithCapacity:10];

for(int i =0; i<CC_MD5_DIGEST_LENGTH;i++){

[outPutStr appendFormat:@"%02x", digist[i]];//小写x表示输出的是小写MD5，大写X表示输出的是大写MD5

}

return [outPutStr lowercaseString];

}

+ (NSString *)getMD5WithData:(NSData *)data{

const char* original_str = (const char *)[data bytes];

unsigned char digist[CC_MD5_DIGEST_LENGTH]; //CC_MD5_DIGEST_LENGTH = 16

CC_MD5(original_str, strlen(original_str), digist);

NSMutableString* outPutStr = [NSMutableString stringWithCapacity:10];

for(int i =0; i<CC_MD5_DIGEST_LENGTH;i++){

[outPutStr appendFormat:@"%02x",digist[i]];//小写x表示输出的是小写MD5，大写X表示输出的是大写MD5

}

//也可以定义一个字节数组来接收计算得到的MD5值

// Byte byte[16];

// CC_MD5(original_str, strlen(original_str), byte);

// NSMutableString* outPutStr = [NSMutableString stringWithCapacity:10];

// for(int i = 0; i<CC_MD5_DIGEST_LENGTH;i++){

// [outPutStr appendFormat:@"%02x",byte[i]];

// }

// [temp release];

return [outPutStr lowercaseString];

}

+ (NSString *)getFileMD5WithPath:(NSString*)path{

return (__bridge_transfer NSString *)FileMD5HashCreateWithPath((__bridge CFStringRef)path,FileHashDefaultChunkSizeForReadingData);

}

CFStringRef FileMD5HashCreateWithPath(CFStringRef filePath,

size_t chunkSizeForReadingData) {

// Declare needed variables

CFStringRef result = NULL;

CFReadStreamRef readStream = NULL;

// Get the file URL

CFURLRef fileURL =

CFURLCreateWithFileSystemPath(kCFAllocatorDefault,

(CFStringRef)filePath,

kCFURLPOSIXPathStyle,

(Boolean)false);

CC_MD5_CTX hashObject;

bool hasMoreData = true;

bool didSucceed;

if (!fileURL) goto done;

// Create and open the read stream

readStream = CFReadStreamCreateWithFile(kCFAllocatorDefault,

(CFURLRef)fileURL);

if (!readStream) goto done;

didSucceed = (bool)CFReadStreamOpen(readStream);

if (!didSucceed) goto done;

// Initialize the hash object

CC_MD5_Init(&hashObject);

// Make sure chunkSizeForReadingData is valid

if (!chunkSizeForReadingData) {

chunkSizeForReadingData = FileHashDefaultChunkSizeForReadingData;

}

// Feed the data to the hash object

while (hasMoreData) {

uint8_t buffer[chunkSizeForReadingData];

CFIndex readBytesCount = CFReadStreamRead(readStream,

(UInt8 *)buffer,

(CFIndex)sizeof(buffer));

if (readBytesCount == -1)break;

if (readBytesCount == 0) {

hasMoreData =false;

continue;

}

CC_MD5_Update(&hashObject,(const void *)buffer,(CC_LONG)readBytesCount);

}

// Check if the read operation succeeded

didSucceed = !hasMoreData;

// Compute the hash digest

unsigned char digest[CC_MD5_DIGEST_LENGTH];

CC_MD5_Final(digest, &hashObject);

// Abort if the read operation failed

if (!didSucceed) goto done;

// Compute the string result

char hash[2 *sizeof(digest) + 1];

for (size_t i =0; i < sizeof(digest); ++i) {

snprintf(hash + (2 * i),3, "%02x", (int)(digest[i]));

}

result = CFStringCreateWithCString(kCFAllocatorDefault,

(const char *)hash,

kCFStringEncodingUTF8);

done:

if (readStream) {

CFReadStreamClose(readStream);

CFRelease(readStream);

}

if (fileURL) {

CFRelease(fileURL);

}

return result;

}

/******

ex:

NSString * filePath = @"API"

NSString * fileMD5 = [LTBMD5 getFileMD5WithPath: filePath];

******/

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