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scd: Fix for large ECC keys.

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* scd/app-openpgp.c (do_decipher): Support larger length.

--

Reported-by: Achim Pietig <achim@pietig.com>
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2017-08-29 14:35:47 +09:00 committed by Werner Koch
parent 7089dcc540
commit 827abe01a7
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 32 additions and 8 deletions
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40
scd/app-openpgp.c
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@ -4575,19 +4575,43 @@ do_decipher (app_t app, const char *keyidstr,
} }
} }
fixuplen = 7; n = 0;
if (indatalen < 128)
fixuplen = 7;
else
fixuplen = 10;
fixbuf = xtrymalloc (fixuplen + indatalen); fixbuf = xtrymalloc (fixuplen + indatalen);
if (!fixbuf) if (!fixbuf)
return gpg_error_from_syserror (); return gpg_error_from_syserror ();
/* Build 'Cipher DO' */ /* Build 'Cipher DO' */
fixbuf[0] = '\xa6'; fixbuf[n++] = '\xa6';
fixbuf[1] = (char)(indatalen+5); if (indatalen < 128)
fixbuf[2] = '\x7f'; fixbuf[n++] = (char)(indatalen+5);
fixbuf[3] = '\x49'; else
fixbuf[4] = (char)(indatalen+2); {
fixbuf[5] = '\x86'; fixbuf[n++] = 0x81;
fixbuf[6] = (char)indatalen; fixbuf[n++] = (char)(indatalen+7);
}
fixbuf[n++] = '\x7f';
fixbuf[n++] = '\x49';
if (indatalen < 128)
fixbuf[n++] = (char)(indatalen+2);
else
{
fixbuf[n++] = 0x81;
fixbuf[n++] = (char)(indatalen+3);
}
fixbuf[n++] = '\x86';
if (indatalen < 128)
fixbuf[n++] = (char)indatalen;
else
{
fixbuf[n++] = 0x81;
fixbuf[n++] = (char)indatalen;
}
if (old_format_len) if (old_format_len)
{ {
memset (fixbuf+fixuplen, 0, 32 - old_format_len); memset (fixbuf+fixuplen, 0, 32 - old_format_len);