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Trim leading zero's first, then check for MSB being set.

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This commit is contained in:
David Garske
2020-10-29 08:38:55 -07:00
parent ef7a987759
commit 95c8a48285
1 changed files with 3 additions and 3 deletions
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6
wolfcrypt/src/asn.c
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@@ -15466,13 +15466,13 @@ int StoreECC_DSA_Sig_Bin(byte* out, word32* outLen, const byte* r, word32 rLen,
word32 headerSz = 4; /* 2*ASN_TAG + 2*LEN(ENUM) */ word32 headerSz = 4; /* 2*ASN_TAG + 2*LEN(ENUM) */
int rAddLeadZero, sAddLeadZero; int rAddLeadZero, sAddLeadZero;
/* Trim leading zeros */
rLen = trim_leading_zeros(&r, rLen);
sLen = trim_leading_zeros(&s, sLen);
/* If the leading bit on the INTEGER is a 1, add a leading zero */ /* If the leading bit on the INTEGER is a 1, add a leading zero */
/* Add leading zero if MSB is set */ /* Add leading zero if MSB is set */
rAddLeadZero = is_leading_bit_set(r, rLen); rAddLeadZero = is_leading_bit_set(r, rLen);
sAddLeadZero = is_leading_bit_set(s, sLen); sAddLeadZero = is_leading_bit_set(s, sLen);
/* Trim leading zeros */
rLen = trim_leading_zeros(&r, rLen);
sLen = trim_leading_zeros(&s, sLen);
if (*outLen < (rLen + rAddLeadZero + sLen + sAddLeadZero + if (*outLen < (rLen + rAddLeadZero + sLen + sAddLeadZero +
headerSz + 2)) /* SEQ_TAG + LEN(ENUM) */ headerSz + 2)) /* SEQ_TAG + LEN(ENUM) */