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Output armor works, RSA keygen works.

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This commit is contained in:
Werner Koch 1997-11-19 13:12:23 +00:00
parent 5393dd53c5
commit 25c8f1a3d7
21 changed files with 395 additions and 115 deletions
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167
g10/encode.c
View file

@ -56,9 +56,52 @@ typedef struct {
} cipher_filter_context_t;
typedef struct {
int status;
int what;
byte buf[3];
int idx, idx2;
u32 crc;
} armor_filter_context_t;
#define CRCINIT 0xB704CE
#define CRCPOLY 0X864CFB
#define CRCUPDATE(a,c) do { \
a = ((a) << 8) ^ crc_table[((a)&0xff >> 16) ^ (c)]; \
a &= 0x00ffffff; \
} while(0)
static u32 crc_table[256];
static int crc_table_initialized;
static void
init_crc_table(void)
{
int i, j;
u32 t;
crc_table[0] = 0;
for(i=j=0; j < 128; j++ ) {
t = crc_table[j];
if( t & 0x00800000 ) {
t <<= 1;
crc_table[i++] = t ^ CRCPOLY;
crc_table[i++] = t;
}
else {
t <<= 1;
crc_table[i++] = t;
crc_table[i++] = t ^ CRCPOLY;
}
}
crc_table_initialized=1;
}
/****************
* Encode FILENAME only with the symmetric cipher. Take input from
@ -106,8 +149,10 @@ encode_simple( const char *filename, int mode )
int rc = 0;
u32 filesize;
cipher_filter_context_t cfx;
armor_filter_context_t afx;
memset( &cfx, 0, sizeof cfx);
memset( &afx, 0, sizeof afx);
/* prepare iobufs */
if( !(inp = iobuf_open(filename)) ) {
@ -135,7 +180,7 @@ encode_simple( const char *filename, int mode )
}
if( opt.armor )
iobuf_push_filter( out, armor_filter, NULL );
iobuf_push_filter( out, armor_filter, &afx );
write_comment( out, "#Created by G10 pre-release " VERSION );
@ -197,11 +242,13 @@ encode_crypt( const char *filename, STRLIST remusr )
int last_rc, rc = 0;
u32 filesize;
cipher_filter_context_t cfx;
armor_filter_context_t afx;
int any_names = 0;
STRLIST local_remusr = NULL;
char *ustr;
memset( &cfx, 0, sizeof cfx);
memset( &afx, 0, sizeof afx);
if( !remusr ) {
remusr = NULL; /* fixme: ask */
@ -225,7 +272,7 @@ encode_crypt( const char *filename, STRLIST remusr )
}
if( opt.armor )
iobuf_push_filter( out, armor_filter, NULL );
iobuf_push_filter( out, armor_filter, &afx );
write_comment( out, "#Created by G10 pre-release " VERSION );
@ -389,11 +436,121 @@ open_outfile( const char *iname )
static int
armor_filter( void *opaque, int control,
IOBUF chain, byte *buf, size_t *ret_len)
IOBUF a, byte *buffer, size_t *ret_len)
{
if( control == IOBUFCTRL_DESC ) {
*(char**)buf = "armor_filter";
static byte bintoasc[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
size_t size = *ret_len;
armor_filter_context_t *afx = opaque;
int rc=0, i, c;
byte buf[3];
int idx, idx2;
u32 crc;
if( control == IOBUFCTRL_FLUSH ) {
if( !afx->status ) { /* write the header line */
if( !afx->what )
iobuf_writestr(a, "-----BEGIN PGP MESSAGE-----\n");
else
iobuf_writestr(a, "-----BEGIN PGP PUBLIC KEY BLOCK-----\n");
iobuf_writestr(a, "Version: G10 pre-release " VERSION "\n");
iobuf_writestr(a, "Comment: This is a alpha test version!\n\n");
afx->status++;
afx->idx = 0;
afx->idx2 = 0;
afx->crc = CRCINIT;
}
crc = afx->crc;
idx = afx->idx;
idx2 = afx->idx2;
for(i=0; i < idx; i++ )
buf[i] = afx->buf[i];
for(i=0; i < size; i++ )
crc = (crc << 8) ^ crc_table[(crc >> 16)&0xff ^ buffer[i]];
crc &= 0x00ffffff;
for( ; size; buffer++, size-- ) {
buf[idx++] = *buffer;
if( idx > 2 ) {
idx = 0;
c = bintoasc[(*buf >> 2) & 077];
iobuf_put(a, c);
c = bintoasc[(((*buf<<4)&060)|((buf[1] >> 4)&017))&077];
iobuf_put(a, c);
c = bintoasc[(((buf[1]<<2)&074)|((buf[2]>>6)&03))&077];
iobuf_put(a, c);
c = bintoasc[buf[2]&077];
iobuf_put(a, c);
if( ++idx2 > (72/4) ) {
iobuf_put(a, '\n');
idx2=0;
}
}
}
for(i=0; i < idx; i++ )
afx->buf[i] = buf[i];
afx->idx = idx;
afx->idx2 = idx2;
afx->crc = crc;
}
else if( control == IOBUFCTRL_INIT ) {
if( !crc_table_initialized )
init_crc_table();
}
else if( control == IOBUFCTRL_FREE ) {
if( afx->status ) { /* pad, write cecksum, and bottom line */
crc = afx->crc;
idx = afx->idx;
idx2 = afx->idx2;
for(i=0; i < idx; i++ )
buf[i] = afx->buf[i];
if( idx ) {
c = bintoasc[(*buf>>2)&077];
iobuf_put(a, c);
if( idx == 1 ) {
c = bintoasc[((*buf << 4) & 060) & 077];
iobuf_put(a, c);
iobuf_put(a, '=');
iobuf_put(a, '=');
}
else { /* 2 */
c = bintoasc[(((*buf<<4)&060)|((buf[1]>>4)&017))&077];
iobuf_put(a, c);
c = bintoasc[((buf[1] << 2) & 074) & 077];
iobuf_put(a, c);
iobuf_put(a, '=');
}
++idx2;
}
/* may need a linefeed */
if( idx2 < (72/4) )
iobuf_put(a, '\n');
/* write the CRC */
iobuf_put(a, '=');
buf[0] = crc >>16;
buf[1] = crc >> 8;
buf[2] = crc;
c = bintoasc[(*buf >> 2) & 077];
iobuf_put(a, c);
c = bintoasc[(((*buf<<4)&060)|((buf[1] >> 4)&017))&077];
iobuf_put(a, c);
c = bintoasc[(((buf[1]<<2)&074)|((buf[2]>>6)&03))&077];
iobuf_put(a, c);
c = bintoasc[buf[2]&077];
iobuf_put(a, c);
iobuf_put(a, '\n');
/* and the the trailer */
if( !afx->what )
iobuf_writestr(a, "-----END PGP MESSAGE-----\n");
else
iobuf_writestr(a, "-----END PGP PUBLIC KEY BLOCK-----\n");
}
}
else if( control == IOBUFCTRL_DESC )
*(char**)buf = "armor_filter";
return 0;
}