Re: How to convert a compressed public key into uncompressed one in Python?

Quote from: PowerGlove on Today at 03:22:56 PM

The Python script you've already discovered, over here works correctly as far as I can tell.

Substituting your example keys into the "compressed_key" variable on line 12 and running the script three times produced the following results:

compressed_key = '025A2146590B80D1F0D97CC7104E702011AFFF21BFAF817F5C7002446369BA9DDC'

Code:

045a2146590b80d1f0d97cc7104e702011afff21bfaf817f5c7002446369ba9ddc9bd5dcd1b4a737244d6bb7b96e256391b8597d3a7972a6f8ca9096d4aea1f37e

compressed_key = '035728F4692D85D411DF3643CD69FE05C411A0D507C7D814008F56C8F260AD7ED9'

Code:

045728f4692d85d411df3643cd69fe05c411a0d507c7d814008f56c8f260ad7ed99e2df8d9cb1a575d55264692629ae22e518bc14ad02592941c13be6755c72973

compressed_key = '039E87EB177890FDD788B95843ED53AD4FB6E877E3F730EF1E73593964C2AB9D15'

Code:

049e87eb177890fdd788b95843ed53ad4fb6e877e3f730ef1e73593964c2ab9d15a3b647c8c4a0766420917b7b445cdcd6bfec2900175c5534c6113954f3ff00d9

I found the error. If inputting 0x... hex values with str() conversion into the function, it is going to output incorrect values. So it requires the compressed inputting public key to be a string with ' ' single quotes like:
https://i.stack.imgur.com/AdY3o.png
New test results:
Test 1:

Code:

045a2146590b80d1f0d97cc7104e702011afff21bfaf817f5c7002446369ba9ddc9bd5dcd1b4a737244d6bb7b96e256391b8597d3a7972a6f8ca9096d4aea1f37e

Test 2:

Code:

045728f4692d85d411df3643cd69fe05c411a0d507c7d814008f56c8f260ad7ed99e2df8d9cb1a575d55264692629ae22e518bc14ad02592941c13be6755c72973

Test 3:

Code:

049e87eb177890fdd788b95843ed53ad4fb6e877e3f730ef1e73593964c2ab9d15a3b647c8c4a0766420917b7b445cdcd6bfec2900175c5534c6113954f3ff00d9

So, thanks!