When computing Ed25519 r, fully populate a BLAKE2b block (#1368)
When computing Ed25519 r, fully populate a BLAKE2b block (#1368)

When computing Ed25519 r, fully populate a BLAKE2b block with non-message data
clemahieu/raiblocks,clemahieu/raiblocks,clemahieu/raiblocks,clemahieu/raiblocks,clemahieu/raiblocks,SergiySW/raiblocks,SergiySW/raiblocks,SergiySW/raiblocks,SergiySW/raiblocks,clemahieu/raiblocks,SergiySW/raiblocks