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SetRsaPublicKey() to support ASN.1 unsigned intergers correctly.

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This commit is contained in:
John Safranek 2014-01-10 11:29:08 -08:00
parent f9e73a8aeb
commit 4a975e8d00
1 changed files with 7 additions and 4 deletions
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11
ctaocrypt/src/asn.c
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@ -3936,14 +3936,16 @@ static int SetRsaPublicKey(byte* output, RsaKey* key)
int lenSz;
int idx;
int rawLen;
int leadingBit;
/* n */
rawLen = mp_unsigned_bin_size(&key->n);
leadingBit = mp_leading_bit(&key->n);
rawLen = mp_unsigned_bin_size(&key->n) + leadingBit;
n[0] = ASN_INTEGER;
nSz = SetLength(rawLen, n + 1) + 1; /* int tag */
if ( (nSz + rawLen) < (int)sizeof(n)) {
int err = mp_to_unsigned_bin(&key->n, n + nSz);
int err = mp_to_unsigned_bin(&key->n, n + nSz + leadingBit);
if (err == MP_OKAY)
nSz += rawLen;
else
@ -3953,12 +3955,13 @@ static int SetRsaPublicKey(byte* output, RsaKey* key)
return BUFFER_E;
/* e */
rawLen = mp_unsigned_bin_size(&key->e);
leadingBit = mp_leading_bit(&key->e);
rawLen = mp_unsigned_bin_size(&key->e) + leadingBit;
e[0] = ASN_INTEGER;
eSz = SetLength(rawLen, e + 1) + 1; /* int tag */
if ( (eSz + rawLen) < (int)sizeof(e)) {
int err = mp_to_unsigned_bin(&key->e, e + eSz);
int err = mp_to_unsigned_bin(&key->e, e + eSz + leadingBit);
if (err == MP_OKAY)
eSz += rawLen;
else