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

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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 lenSz;
int idx; int idx;
int rawLen; int rawLen;
int leadingBit;
/* n */ /* 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; n[0] = ASN_INTEGER;
nSz = SetLength(rawLen, n + 1) + 1; /* int tag */ nSz = SetLength(rawLen, n + 1) + 1; /* int tag */
if ( (nSz + rawLen) < (int)sizeof(n)) { 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) if (err == MP_OKAY)
nSz += rawLen; nSz += rawLen;
else else
@@ -3953,12 +3955,13 @@ static int SetRsaPublicKey(byte* output, RsaKey* key)
return BUFFER_E; return BUFFER_E;
/* 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; e[0] = ASN_INTEGER;
eSz = SetLength(rawLen, e + 1) + 1; /* int tag */ eSz = SetLength(rawLen, e + 1) + 1; /* int tag */
if ( (eSz + rawLen) < (int)sizeof(e)) { 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) if (err == MP_OKAY)
eSz += rawLen; eSz += rawLen;
else else