Class: Ccrypto::ScryptConfig

Inherits:
KDFConfig show all
Defined in:
lib/ccrypto/configs/kdf_config.rb

Instance Attribute Summary collapse

Attributes inherited from KDFConfig

#algo

Instance Method Summary collapse

Methods included from AlgoConfig

include

Constructor Details

#initialize ⇒ ScryptConfig

stackoverflow.com/questions/11126315/what-are-optimal-scrypt-work-factors Specific good explanation: stackoverflow.com/a/30308723/3625825 Memory requirement : 128 bytes x Cost Factor x block size at cost factor 2^14 = 16384 == 128 bytes x 16384 (cost) x 8 (block size) === 16 MB if at cost factor 2 ^ 14 = 16384 == 128 x 16384 (cost) x 512 (block size) === 1 GB Tuning the cost & block size can change how much memory needed to process this for EACH TIME PROCESSING…

Legitimate user only need to do once Attacker using brute force may not be feasiable anymore if the value is high

BC source code indicated Cost parameter bound >= 1 and < 65536 (2^16) (value must be power of 2, i.e 2^1 = 2, 2^2 = 4 etc) the actual is the max value should be 2^(128*blocksize/8) block size = 1 == 2^(128*1/8) == 2^(128/8) == 2^16 block size = 2 == 2^(128*2/8) == 2^32 == 4 GB If want higher value, change block size 2^16 is min in this case because block must be 1 and above block size>= 1 parallelization must be > 1 and < Integer.MAX_VALUE / (128 * parallelization * 8) tested on Java 8 Integer.MAX_VALUE = 2GB (2^31) if parallelization value == 1, the supported parallel is 2048,000 Hmm that’s why I think nobody use more then 1?

this config shall be 16 MB per process costParam = opts || 2 ** 14 # 2 ^ 16 blockSize = opts || 8 this one also 16 MB per process but apparently there are saying higher r is better stackoverflow.com/a/33297994/3625825



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# File 'lib/ccrypto/configs/kdf_config.rb', line 44

def initialize
  @algo = :scrypt
  @cost = 16384 # 2**14
  @blocksize = 8
  @parallel = 1
  @salt = SecureRandom.random_bytes(16)
end

Instance Attribute Details

#blocksize ⇒ Object

Returns the value of attribute blocksize.



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# File 'lib/ccrypto/configs/kdf_config.rb', line 10

def blocksize
  @blocksize
end

#cost ⇒ Object

Returns the value of attribute cost.



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# File 'lib/ccrypto/configs/kdf_config.rb', line 10

def cost
  @cost
end

#outBitLength ⇒ Object

Returns the value of attribute outBitLength.



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# File 'lib/ccrypto/configs/kdf_config.rb', line 11

def outBitLength
  @outBitLength
end

#parallel ⇒ Object

Returns the value of attribute parallel.



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# File 'lib/ccrypto/configs/kdf_config.rb', line 10

def parallel
  @parallel
end

#salt ⇒ Object

Returns the value of attribute salt.



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# File 'lib/ccrypto/configs/kdf_config.rb', line 11

def salt
  @salt
end