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Update draft-irtf-cfrg-det-sigs-with-noise.md
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emanjon authored Feb 29, 2024
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8 changes: 4 additions & 4 deletions draft-irtf-cfrg-det-sigs-with-noise.md
Original file line number Diff line number Diff line change
Expand Up @@ -482,8 +482,8 @@ For Deterministic ECDSA: In existing ECDSA deployments where side-channel and fa
~~~~~~~~~~~~~~~~~~~~~~~
d. Set:

K = HMAC_K(V || 0x00 || Zd || 000... || int2octets(x) || 000...
|| bits2octets(h1))
K = HMAC_K(V || 0x00 || Zd || 000... || int2octets(x) ||
000... || bits2octets(h1))

where '||' denotes concatenation. In other words, we compute
HMAC with key K, over the concatenation of the following, in
Expand All @@ -503,8 +503,8 @@ d. Set:
~~~~~~~~~~~~~~~~~~~~~~~
f. Set:

K = HMAC_K(V || 0x01 || Zf || 000... || int2octets(x) || 000...
|| bits2octets(h1))
K = HMAC_K(V || 0x01 || Zf || 000... || int2octets(x) ||
000... || bits2octets(h1))

Note that the "internal octet" is 0x01 this time and that Zf is
newly generated random data, i.e., not reused from step (d).
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