本文共 587 字，大约阅读时间需要 1 分钟。

参考：http://www.jianshu.com/p/8bc791ec42b6

http://www.cnblogs.com/scu-cjx/p/6878853.html

#import <CommonCrypto/CommonDigest.h>

//SHA1加密方式

+(NSString*)sha1WithStr:(NSString *)str

{

    const char *cstr = [str cStringUsingEncoding:NSUTF8StringEncoding];

    NSData *data = [NSData dataWithBytes:cstr length: strlen(cstr)];

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

    CC_SHA1(data.bytes, data.length, digest);

    NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];

    for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++)

        [output appendFormat:@"%02x", digest[i]];

    return output;

}