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See ChangeLog: Sat Sep 18 12:16:08 CEST 1999 Werner Koch

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Werner Koch 1999-09-18 10:17:16 +00:00
parent a3ee7c4682
commit 24ae98041f
8 changed files with 356 additions and 39 deletions
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59
g10/cipher.c
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@ -44,40 +44,58 @@ write_header( cipher_filter_context_t *cfx, IOBUF a )
PACKET pkt;
PKT_encrypted ed;
byte temp[18];
unsigned blocksize;
int blocksize;
unsigned nprefix;
int use_mdc = opt.force_mdc;
int rc;
memset( &ed, 0, sizeof ed );
ed.len = cfx->datalen;
ed.new_ctb = !ed.len && !opt.rfc1991;
if( use_mdc ) {
ed.mdc_method = DIGEST_ALGO_SHA1;
cfx->mdc_hash = md_open( DIGEST_ALGO_SHA1, 0 );
md_start_debug( cfx->mdc_hash, "mdccreat" );
cfx->mdc_hash = gcry_md_open( DIGEST_ALGO_SHA1, 0 );
/*md_start_debug( cfx->mdc_hash, "mdccreat" );*/
}
init_packet( &pkt );
pkt.pkttype = use_mdc? PKT_ENCRYPTED_MDC : PKT_ENCRYPTED;
pkt.pkt.encrypted = &ed;
if( build_packet( a, &pkt ))
log_bug("build_packet(ENCR_DATA) failed\n");
blocksize = cipher_get_blocksize( cfx->dek->algo );
blocksize = gcry_cipher_get_algo_blklen( cfx->dek->algo );
if( blocksize < 8 || blocksize > 16 )
log_fatal("unsupported blocksize %u\n", blocksize );
log_fatal("unsupported blocksize %d\n", blocksize );
nprefix = blocksize;
randomize_buffer( temp, nprefix, 1 );
temp[nprefix] = temp[nprefix-2];
temp[nprefix+1] = temp[nprefix-1];
print_cipher_algo_note( cfx->dek->algo );
cfx->cipher_hd = cipher_open( cfx->dek->algo, CIPHER_MODE_AUTO_CFB, 1 );
if( gcry_cipher_open( &cfx->cipher_hd,
cfx->dek->algo,
CIPHER_MODE_CFB,
GCRY_CIPHER_SECURE
| (cfy->dek->algo >= 100 ?
0 : GCRY_CIPHER_ENABLE_SYNC) )
) {
/* we should never get an error here cause we already checked, that
* the algorithm is available. */
BUG();
}
/* log_hexdump( "thekey", cfx->dek->key, cfx->dek->keylen );*/
cipher_setkey( cfx->cipher_hd, cfx->dek->key, cfx->dek->keylen );
cipher_setiv( cfx->cipher_hd, NULL, 0 );
rc = gcry_cipher_setkey( cfx->cipher_hd, cfx->dek->key, cfx->dek->keylen );
if( !rc )
rc = gcry_cipher_setiv( cfx->cipher_hd, NULL, 0 );
if( rc )
log_fatal("set key or IV failed: %s\n", gcry_strerror(rc) );
/* log_hexdump( "prefix", temp, nprefix+2 ); */
if( cfx->mdc_hash )
md_write( cfx->mdc_hash, temp, nprefix+2 );
cipher_encrypt( cfx->cipher_hd, temp, temp, nprefix+2);
cipher_sync( cfx->cipher_hd );
gcry_md_write( cfx->mdc_hash, temp, nprefix+2 );
rc = cipher_encrypt( cfx->cipher_hd, temp, nprefix+2, NULL, 0 );
if( !rc )
rc = gcry_cipher_sync( cfx->cipher_hd );
if( rc )
log_fatal("encrypt failed: %s\n", gcry_strerror(rc) );
iobuf_write(a, temp, nprefix+2);
cfx->header=1;
}
@ -104,23 +122,26 @@ cipher_filter( void *opaque, int control,
write_header( cfx, a );
}
if( cfx->mdc_hash )
md_write( cfx->mdc_hash, buf, size );
cipher_encrypt( cfx->cipher_hd, buf, buf, size);
gcry_md_write( cfx->mdc_hash, buf, size );
rc = gcry_cipher_encrypt( cfx->cipher_hd, buf, size, NULL, 0);
if( rc )
log_fatal("encrypt failed: %s\n", gcry_strerror(rc) );
if( iobuf_write( a, buf, size ) )
rc = G10ERR_WRITE_FILE;
}
else if( control == IOBUFCTRL_FREE ) {
if( cfx->mdc_hash ) {
byte *hash;
int hashlen = md_digest_length( md_get_algo( cfx->mdc_hash ) );
md_final( cfx->mdc_hash );
hash = md_read( cfx->mdc_hash, 0 );
cipher_encrypt( cfx->cipher_hd, hash, hash, hashlen );
int hashlen = gcry_md_get_algo_dlen( gcry_md_get_algo( cfx->mdc_hash ) );
hash = gcry_md_read( cfx->mdc_hash, 0 );
rc = gcry_cipher_encrypt( cfx->cipher_hd, hash, hashlen, NULL, 0 );
if( rc )
log_fatal("encrypt failed: %s\n", gcry_strerror(rc) );
if( iobuf_write( a, hash, hashlen ) )
rc = G10ERR_WRITE_FILE;
md_close( cfx->mdc_hash ); cfx->mdc_hash = NULL;
gcry_md_close( cfx->mdc_hash ); cfx->mdc_hash = NULL;
}
cipher_close(cfx->cipher_hd);
gcry_cipher_close(cfx->cipher_hd);
}
else if( control == IOBUFCTRL_DESC ) {
*(char**)buf = "cipher_filter";