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Add info on private key encoding

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Piotr Włodarek 2018-01-11 21:47:52 +01:00
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docs/cryptography/asymmetric/private-key.md
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@ -16,9 +16,6 @@ Private key is a **scalar**, meaning it is a single value.
In equations scalars are represented by **lowercase letters**. In equations scalars are represented by **lowercase letters**.
In user-facing contexts, private key is encoded in a [little-endian](https://en.wikipedia.org/wiki/Endianness#Little) hexadecimal form, like:
`b3588a87056fb21dc4d052d59e83b54293882e646b543c29478e4cf45c28a402`
## Relation to Ed25519 ## Relation to Ed25519
Being simply a random integer, private key is not specific to any particular asymmetric cryptography scheme. Being simply a random integer, private key is not specific to any particular asymmetric cryptography scheme.
@ -36,6 +33,14 @@ where `l` is the maximum scalar allowed by the [Ed25519 scheme](/cryptography/as
The `l` is on the order of 2^252, so the effective key strength is technically 252 bits, not 256 bits. The `l` is on the order of 2^252, so the effective key strength is technically 252 bits, not 256 bits.
This is standard for EC cryptography and is more of a cosmetic nuance than any concern. This is standard for EC cryptography and is more of a cosmetic nuance than any concern.
## Encoding
In user-facing contexts, the private key integer is:
1. Taken modulo `l` to avoid malleability
2. Put as array of 32 bytes in a [little-endian](https://en.wikipedia.org/wiki/Endianness#Little) direction (the first byte is the least significant)
3. Converted to hexadecimal form, like: `b3588a87056fb21dc4d052d59e83b54293882e646b543c29478e4cf45c28a402`
## Private spend key ## Private spend key
Private spend key is used to spend moneros. Private spend key is used to spend moneros.