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Fix erroneous index length for XMSSMT

This produced repeated indices when reaching 2^32 signatures.
This was introduced in 9b35b00d98
with the re-introduction of runtime parameters. Compile-time parameters
did not contain this error.
master
Joost Rijneveld 7 years ago
parent
commit
bbbb95e869
No known key found for this signature in database GPG Key ID: A4FE39CF49CBC553
2 changed files with 3 additions and 2 deletions
  1. +2
    -1
      params.c
  2. +1
    -1
      xmss_core.c

+ 2
- 1
params.c View File

@@ -456,7 +456,8 @@ int xmssmt_parse_oid(xmss_params *params, const uint32_t oid)
params->wots_len2 = 3;
params->wots_len = params->wots_len1 + params->wots_len2;
params->wots_keysize = params->wots_len * params->n;
params->index_len = 4;
/* Round index_len up to nearest byte. */
params->index_len = (params->full_height + 7) / 8;
params->bytes = (params->index_len + params->n + params->d*params->wots_keysize
+ params->full_height *params->n);
params->publickey_bytes = 2*params->n;


+ 1
- 1
xmss_core.c View File

@@ -176,7 +176,7 @@ int xmssmt_core_keypair(const xmss_params *params,

/* Initialize index to 0. */
memset(sk, 0, params->index_len);
sk += 4;
sk += params->index_len;

/* Initialize SK_SEED, SK_PRF and PUB_SEED. */
randombytes(sk, 3 * params->n);


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