MD5:

+ (NSString *)md5:(NSString *)input {

    const char *cStr = [input UTF8String];

    unsigned char digest[CC_MD5_DIGEST_LENGTH];

    CC_MD5( cStr, (CC_LONG)strlen(cStr), digest );

    NSMutableString *output = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];

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

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

    }

    return  output;

}

SHA1:

+ (NSString *) sha1:(NSString *)input

{

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

    NSData *data = [NSData dataWithBytes:cstr length:input.length];

    uint8_t digest[CC_SHA1_DIGEST_LENGTH];

    CC_SHA1(data.bytes, (unsigned int)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;

}