kris/xmss-KAT-generator
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Fix erroneous index length for XMSSMT

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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.
This commit is contained in:
Joost Rijneveld 2017-10-24 17:21:16 +02:00
parent 4111393912
commit bbbb95e869
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GPG Key ID: A4FE39CF49CBC553
2 changed files with 3 additions and 2 deletions
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3
params.c
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@ -456,7 +456,8 @@ int xmssmt_parse_oid(xmss_params *params, const uint32_t oid)
params->wots_len2 = 3; params->wots_len2 = 3;
params->wots_len = params->wots_len1 + params->wots_len2; params->wots_len = params->wots_len1 + params->wots_len2;
params->wots_keysize = params->wots_len * params->n; 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->bytes = (params->index_len + params->n + params->d*params->wots_keysize
+ params->full_height *params->n); + params->full_height *params->n);
params->publickey_bytes = 2*params->n; params->publickey_bytes = 2*params->n;

2
xmss_core.c
View File

@ -176,7 +176,7 @@ int xmssmt_core_keypair(const xmss_params *params,
/* Initialize index to 0. */ /* Initialize index to 0. */
memset(sk, 0, params->index_len); memset(sk, 0, params->index_len);
sk += 4; sk += params->index_len;
/* Initialize SK_SEED, SK_PRF and PUB_SEED. */ /* Initialize SK_SEED, SK_PRF and PUB_SEED. */
randombytes(sk, 3 * params->n); randombytes(sk, 3 * params->n);