update pricing numbers

EIPS/eip-2666.md

@@ -33,12 +33,14 @@ Motivation is simple: make pricing formulas accurately reflect resources (CPU ti
 This EIP proposes the following changes:
 - Small running time to perform gas estimation for precompile call is absorbed into the precompile cost itself
 - Precompiles are repricied as:
-  - `SHA256` precompile (address `0x02`) was priced as `60` gas plus `12` gas per `32` bytes of input. Now it should be priced as `12 + ((len(input) + 8)/64 + 1) * 5`
-  - RIPEMD precompile (address `0x03`) was priced as `600` gas plus `120` gas per `32` bytes of input. Now it should be priced as `16 + ((len(input) + 8)/64 + 1) * 6`
+  - `SHA256` precompile (address `0x02`) was priced as `60` gas plus `12` gas per `32` bytes of input. Now it should be priced as `5 + ((len(input) + 8)/64 + 1) * 9`
+    - Improvements in Rust implementation can allow to reduce price to `3 + ((len(input) + 8)/64 + 1) * 5` (both constant and length-dependent contributions)
+  - RIPEMD precompile (address `0x03`) was priced as `600` gas plus `120` gas per `32` bytes of input. Now it should be priced as `6 + ((len(input) + 8)/64 + 1) * 12`
+    - Improvements in Go implementation can allow to reduce price to `2 + ((len(input) + 8)/64 + 1) * 8` (both constant and length-dependent contributions)
   - `BNADD` precompile (address `0x06`) should be repriced from `150` gas to `350` gas
   - `BNMUL` precompile (address `0x07`) should be repriced from `6000` gas to `6300` gas
-- Keccak256 built-in function was priced as `30` gas plus `6` gas per `32` bytes of the input. Now it should be priced as `16 + (len(input)/136 + 1)*13`
-  - If Geth implementation of Keccak256 is reworked than formula can be changed further to `16 + (len(input)/136 + 1)*2`
+- Keccak256 built-in function was priced as `30` gas plus `6` gas per `32` bytes of the input. Now it should be priced as `13 + (len(input)/136 + 1)*15`
+  - Improvements in Go implementation can allow to reduce price to `2 + (len(input)/136 + 1)*15` (constant contribution reduction)
 - Client implementations of gas metering function SHOULD be implemented with efficiency in mind, e.g. use `uint64` type instead of `uint256` that is sufficient for all reasonable prices taking into the account gas limits in the block
 
 This EIP requires that `MODEXP` repricing is [implemented](https://eips.ethereum.org/EIPS/eip-2565) to also accurately reflect that there is implicit compensation for an old `STATICCALL` cost (pre-2046).