security-and-privacy/gnupg
security-and-privacy/gnupg
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As promised a agent which already does some things. Not very useful

Browse source 
yet but may be of help for using it in ther contexts.
This commit is contained in:
Werner Koch 2001-11-25 14:53:10 +00:00
parent f60dc501d2
commit 922cedfe58
5 changed files with 220 additions and 44 deletions
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87
agent/command.c
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@ -44,13 +44,55 @@
*(p) <= 'F'? (*(p)-'A'+10):(*(p)-'a'+10))
#define xtoi_2(p) ((xtoi_1(p) * 16) + xtoi_1((p)+1))
#if MAX_DIGEST_LEN < 20
#error MAX_DIGEST_LEN shorter than keygrip
#endif
/* Data used to associate an Assuan context with local server data */
struct server_local_s {
ASSUAN_CONTEXT assuan_ctx;
int message_fd;
};
/* SETHASH <hexstring>
static void
reset_notify (ASSUAN_CONTEXT ctx)
{
CTRL ctrl = assuan_get_pointer (ctx);
memset (ctrl->keygrip, 0, 20);
ctrl->digest.valuelen = 0;
}
/* SIGKEY <hexstring_with_keygrip>
Set the key used for a sign operation */
static int
cmd_sigkey (ASSUAN_CONTEXT ctx, char *line)
{
int n;
char *p;
CTRL ctrl = assuan_get_pointer (ctx);
unsigned char *buf;
/* parse the hash value */
for (p=line,n=0; hexdigitp (*p); p++, n++)
;
if (*p)
return set_error (Parameter_Error, "invalid hexstring");
if ((n&1))
return set_error (Parameter_Error, "odd number of digits");
n /= 2;
if (n != 20)
return set_error (Parameter_Error, "invalid length of keygrip");
buf = ctrl->keygrip;
for (p=line, n=0; n < 20; p += 2, n++)
buf[n] = xtoi_2 (p);
return 0;
}
/* SETHASH <algonumber> <hexstring>
The client can use this command to tell the server about the data
(which usually is a hash) to be signed. */
@ -61,6 +103,16 @@ cmd_sethash (ASSUAN_CONTEXT ctx, char *line)
char *p;
CTRL ctrl = assuan_get_pointer (ctx);
unsigned char *buf;
char *endp;
int algo;
/* parse the algo number and check it */
algo = (int)strtoul (line, &endp, 10);
for (line = endp; *line == ' ' || *line == '\t'; line++)
;
if (!algo || gcry_md_test_algo (algo))
return set_error (Unsupported_Algorithm, NULL);
ctrl->digest.algo = algo;
/* parse the hash value */
for (p=line,n=0; hexdigitp (*p); p++, n++)
@ -102,36 +154,6 @@ cmd_pksign (ASSUAN_CONTEXT ctx, char *line)
}
/* MESSAGE FD=<n>
Set the file descriptor to read a message which is used with
detached signatures */
static int
cmd_message (ASSUAN_CONTEXT ctx, char *line)
{
#if 0
char *endp;
int fd;
CTRL ctrl = assuan_get_pointer (ctx);
if (strncmp (line, "FD=", 3))
return set_error (Syntax_Error, "FD=<n> expected");
line += 3;
if (!digitp (*line))
return set_error (Syntax_Error, "number required");
fd = strtoul (line, &endp, 10);
if (*endp)
return set_error (Syntax_Error, "garbage found");
if (fd == -1)
return set_error (No_Input, NULL);
ctrl->server_local->message_fd = fd;
return 0;
#endif
return set_error (Not_Implemented, NULL);
}
/* Tell the assuan library about our commands */
static int
@ -142,11 +164,11 @@ register_commands (ASSUAN_CONTEXT ctx)
int cmd_id;
int (*handler)(ASSUAN_CONTEXT, char *line);
} table[] = {
{ "SIGKEY", 0, cmd_sigkey },
{ "SETHASH", 0, cmd_sethash },
{ "PKSIGN", 0, cmd_pksign },
{ "", ASSUAN_CMD_INPUT, NULL },
{ "", ASSUAN_CMD_OUTPUT, NULL },
{ "MESSAGE", 0, cmd_message },
{ NULL }
};
int i, j, rc;
@ -160,6 +182,7 @@ register_commands (ASSUAN_CONTEXT ctx)
if (rc)
return rc;
}
assuan_register_reset_notify (ctx, reset_notify);
return 0;
}