pub fn scrypt_check(password: &str, hashed_value: &str) -> Result<bool, &'static str> {
    static ERR_STR: &'static str = "Hash is not in Rust Scrypt format.";

    let mut iter = hashed_value.split('$');

    // Check that there are no characters before the first "$"
    match iter.next() {
        Some(x) => if x != "" { return Err(ERR_STR); },
        None => return Err(ERR_STR)
    }

    // Check the name
    match iter.next() {
        Some(t) => if t != "rscrypt" { return Err(ERR_STR); },
        None => return Err(ERR_STR)
    }

    // Parse format - currenlty only version 0 (compact) and 1 (expanded) are supported
    let params: ScryptParams;
    match iter.next() {
        Some(fstr) => {
            // Parse the parameters - the size of them depends on the if we are using the compact or
            // expanded format
            let pvec = match iter.next() {
                Some(pstr) => match pstr.from_base64() {
                    Ok(x) => x,
                    Err(_) => return Err(ERR_STR)
                },
                None => return Err(ERR_STR)
            };
            let pvec = pvec.as_slice();
            match fstr {
                "0" => {
                    if pvec.len() != 3 { return Err(ERR_STR); }
                    let log_n = pvec[0] as u8;
                    let r = pvec[1] as u32;
                    let p = pvec[2] as u32;
                    params = ScryptParams::new(log_n, r, p);
                }
                "1" => {
                    if pvec.len() != 9 { return Err(ERR_STR); }
                    let log_n = pvec[0];
                    let mut pval = [0u32, ..2];
                    read_u32v_le(pval, pvec.slice(1, 9));
                    params = ScryptParams::new(log_n, pval[0], pval[1]);
                }
                _ => return Err(ERR_STR)
            }
        }
        None => return Err(ERR_STR)
    }

    // Salt
    let salt = match iter.next() {
        Some(sstr) => match sstr.from_base64() {
            Ok(salt) => salt,
            Err(_) => return Err(ERR_STR)
        },
        None => return Err(ERR_STR)
    };

    // Hashed value
    let hash = match iter.next() {
        Some(hstr) => match hstr.from_base64() {
            Ok(hash) => hash,
            Err(_) => return Err(ERR_STR)
        },
        None => return Err(ERR_STR)
    };

    // Make sure that the input ends with a "$"
    match iter.next() {
        Some(x) => if x != "" { return Err(ERR_STR); },
        None => return Err(ERR_STR)
    }

    // Make sure there is no trailing data after the final "$"
    match iter.next() {
        Some(_) => return Err(ERR_STR),
        None => { }
    }

    let mut output = Vec::from_elem(hash.len(), 0u8);
    scrypt(password.as_bytes(), salt.as_slice(), &params, output.as_mut_slice());

    // Be careful here - its important that the comparison be done using a fixed time equality
    // check. Otherwise an adversary that can measure how long this step takes can learn about the
    // hashed value which would allow them to mount an offline brute force attack against the
    // hashed password.
    return Ok(fixed_time_eq(output.as_slice(), hash.as_slice()));
}
/**
 * scrypt_check compares a password against the result of a previous call to scrypt_simple and
 * returns true if the passed in password hashes to the same value.
 *
 * # Arguments
 *
 * * password - The password to process as a str
 * * hashed_value - A string representing a hashed password returned by scrypt_simple()
 *
 */
scrypt_check compares a password against the result of a previous call to scrypt_simple and
returns true if the passed in password hashes to the same value.

# Arguments

The password to process as a str
hashed_value - A string representing a hashed password returned by scrypt_simple()
scrypt_check compares a password against the result of a previous call to scrypt_simple and returns true if the passed in password hashes to the same value . # Arguments The password to process as a str hashed_value - A string representing a hashed password returned by scrypt_simple ()
pub fn scrypt_check(password: &str, hashed_value: &str) -> Result<bool, &'static str> {
    static ERR_STR: &'static str = "Hash is not in Rust Scrypt format.";
    let mut iter = hashed_value.split('$');
    // Check that there are no characters before the first "$"
    match iter.next() {
        Some(x) => if x != "" { return Err(ERR_STR); },
        None => return Err(ERR_STR)
    }
    // Check the name
    match iter.next() {
        Some(t) => if t != "rscrypt" { return Err(ERR_STR); },
        None => return Err(ERR_STR)
    }
    // Parse format - currenlty only version 0 (compact) and 1 (expanded) are supported
    let params: ScryptParams;
    match iter.next() {
        Some(fstr) => {
            // Parse the parameters - the size of them depends on the if we are using the compact or
            // expanded format
            let pvec = match iter.next() {
                Some(pstr) => match pstr.from_base64() {
                    Ok(x) => x,
                    Err(_) => return Err(ERR_STR)
                },
                None => return Err(ERR_STR)
            };
            let pvec = pvec.as_slice();
            match fstr {
                "0" => {
                    if pvec.len() != 3 { return Err(ERR_STR); }
                    let log_n = pvec[0] as u8;
                    let r = pvec[1] as u32;
                    let p = pvec[2] as u32;
                    params = ScryptParams::new(log_n, r, p);
                }
                "1" => {
                    if pvec.len() != 9 { return Err(ERR_STR); }
                    let log_n = pvec[0];
                    let mut pval = [0u32, ..2];
                    read_u32v_le(pval, pvec.slice(1, 9));
                    params = ScryptParams::new(log_n, pval[0], pval[1]);
                }
                _ => return Err(ERR_STR)
            }
        }
        None => return Err(ERR_STR)
    }
    // Salt
    let salt = match iter.next() {
        Some(sstr) => match sstr.from_base64() {
            Ok(salt) => salt,
            Err(_) => return Err(ERR_STR)
        },
        None => return Err(ERR_STR)
    };
    // Hashed value
    let hash = match iter.next() {
        Some(hstr) => match hstr.from_base64() {
            Ok(hash) => hash,
            Err(_) => return Err(ERR_STR)
        },
        None => return Err(ERR_STR)
    };
    // Make sure that the input ends with a "$"
    match iter.next() {
        Some(x) => if x != "" { return Err(ERR_STR); },
        None => return Err(ERR_STR)
    }
    // Make sure there is no trailing data after the final "$"
    match iter.next() {
        Some(_) => return Err(ERR_STR),
        None => { }
    }
    let mut output = Vec::from_elem(hash.len(), 0u8);
    scrypt(password.as_bytes(), salt.as_slice(), &params, output.as_mut_slice());
    // Be careful here - its important that the comparison be done using a fixed time equality
    // check. Otherwise an adversary that can measure how long this step takes can learn about the
    // hashed value which would allow them to mount an offline brute force attack against the
    // hashed password.
    return Ok(fixed_time_eq(output.as_slice(), hash.as_slice()));
}
pub fn scrypt_check ( password : & str , hashed_value : & str ) -> Result < bool , & ' static str > { static ERR_STR : & ' static str = " " ; let mut iter = hashed_value . split ( '$' ) ; // Check that there are no characters before the first "$" match iter . next ( ) { Some ( x ) => if x != " " { return Err ( ERR_STR ) ; } , None => return Err ( ERR_STR ) } // Check the name match iter . next ( ) { Some ( t ) => if t != " " { return Err ( ERR_STR ) ; } , None => return Err ( ERR_STR ) } // Parse format - currenlty only version 0 (compact) and 1 (expanded) are supported let params : ScryptParams ; match iter . next ( ) { Some ( fstr ) => { // Parse the parameters - the size of them depends on the if we are using the compact or // expanded format let pvec = match iter . next ( ) { Some ( pstr ) => match pstr . from_base64 ( ) { Ok ( x ) => x , Err ( _ ) => return Err ( ERR_STR ) } , None => return Err ( ERR_STR ) } ; let pvec = pvec . as_slice ( ) ; match fstr { " " => { if pvec . len ( ) != 3 { return Err ( ERR_STR ) ; } let log_n = pvec [ 0 ] as u8 ; let r = pvec [ 1 ] as u32 ; let p = pvec [ 2 ] as u32 ; params = ScryptParams :: new ( log_n , r , p ) ; } " " => { if pvec . len ( ) != 9 { return Err ( ERR_STR ) ; } let log_n = pvec [ 0 ] ; let mut pval = [ 0u32 , .. 2 ] ; read_u32v_le ( pval , pvec . slice ( 1 , 9 ) ) ; params = ScryptParams :: new ( log_n , pval [ 0 ] , pval [ 1 ] ) ; } _ => return Err ( ERR_STR ) } } None => return Err ( ERR_STR ) } // Salt let salt = match iter . next ( ) { Some ( sstr ) => match sstr . from_base64 ( ) { Ok ( salt ) => salt , Err ( _ ) => return Err ( ERR_STR ) } , None => return Err ( ERR_STR ) } ; // Hashed value let hash = match iter . next ( ) { Some ( hstr ) => match hstr . from_base64 ( ) { Ok ( hash ) => hash , Err ( _ ) => return Err ( ERR_STR ) } , None => return Err ( ERR_STR ) } ; // Make sure that the input ends with a "$" match iter . next ( ) { Some ( x ) => if x != " " { return Err ( ERR_STR ) ; } , None => return Err ( ERR_STR ) } // Make sure there is no trailing data after the final "$" match iter . next ( ) { Some ( _ ) => return Err ( ERR_STR ) , None => { } } let mut output = Vec :: from_elem ( hash . len ( ) , 0u8 ) ; scrypt ( password . as_bytes ( ) , salt . as_slice ( ) , & params , output . as_mut_slice ( ) ) ; // Be careful here - its important that the comparison be done using a fixed time equality // check. Otherwise an adversary that can measure how long this step takes can learn about the // hashed value which would allow them to mount an offline brute force attack against the // hashed password. return Ok ( fixed_time_eq ( output . as_slice ( ) , hash . as_slice ( ) ) ) ; }
scrypt_check compares a password against the result of a previous call to scrypt_simple and
 returns true if the passed in password hashes to the same value.
scrypt_check compares a password against the result of a previous call to scrypt_simple and returns true if the passed in password hashes to the same value .
password
&str
hashed_value
&str
password
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hashed_value
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