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BOLT 03: Fix pseudcode for shachain algorithm.

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When deriving a secret from a seed and index, the bits of the index
must be iterated in reverse order.
This commit is contained in:
Jim Posen 2017-09-21 23:12:07 -07:00 committed by Rusty Russell
parent fae35903ae
commit a01f4c55d3
1 changed files with 2 additions and 2 deletions
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03-transactions.md
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@ -472,7 +472,7 @@ The I'th secret P MUST match the output of this algorithm:
generate_from_seed(seed, I):
P = seed
for B in 0 to 47:
for B in 47 down to 0:
if B set in I:
flip(B) in P
P = SHA256(P)
@ -505,7 +505,7 @@ We do this using a slight generalization of `generate_from_seed` above:
# Return I'th secret given base secret whose index has bits..47 the same.
derive_secret(base, bits, I):
P = base
for B in 0 to bits:
for B in bits-1 down to 0:
if B set in I:
flip(B) in P
P = SHA256(P)