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Clarify empty sums in BLS spec (#782) 

Fix #775.
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Justin 2019-03-15 18:18:37 +00:00 committed by GitHub
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specs/bls_signature.md
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@ -110,11 +110,11 @@ def modular_squareroot(value: Fq2) -> Fq2:
### `bls_aggregate_pubkeys`
Let `bls_aggregate_pubkeys(pubkeys: List[Bytes48]) -> Bytes48` return `pubkeys[0] + .... + pubkeys[len(pubkeys)-1]`, where `+` is the elliptic curve addition operation over the G1 curve.
Let `bls_aggregate_pubkeys(pubkeys: List[Bytes48]) -> Bytes48` return `pubkeys[0] + .... + pubkeys[len(pubkeys)-1]`, where `+` is the elliptic curve addition operation over the G1 curve. (When `len(pubkeys) == 0` the empty sum is the G1 point at infinity.)
### `bls_aggregate_signatures`
Let `bls_aggregate_signatures(signatures: List[Bytes96]) -> Bytes96` return `signatures[0] + .... + signatures[len(signatures)-1]`, where `+` is the elliptic curve addition operation over the G2 curve.
Let `bls_aggregate_signatures(signatures: List[Bytes96]) -> Bytes96` return `signatures[0] + .... + signatures[len(signatures)-1]`, where `+` is the elliptic curve addition operation over the G2 curve. (When `len(signatures) == 0` the empty sum is the G2 point at infinity.)
## Signature verification