diff options
| author | Werner Koch <[email protected]> | 1999-02-26 16:59:48 +0000 |
|---|---|---|
| committer | Werner Koch <[email protected]> | 1999-02-26 16:59:48 +0000 |
| commit | 694099b9af96d53ad4a4f9bc70e08c2f393f9f4e (patch) | |
| tree | ff5ddc557b85093cbf4076374bd43b2e958ce804 /g10/sig-check.c | |
| parent | See ChangeLog: Thu Feb 25 18:47:39 CET 1999 Werner Koch (diff) | |
| download | gnupg-694099b9af96d53ad4a4f9bc70e08c2f393f9f4e.tar.gz gnupg-694099b9af96d53ad4a4f9bc70e08c2f393f9f4e.zip | |
See ChangeLog: Fri Feb 26 17:55:41 CET 1999 Werner Koch
Diffstat (limited to '')
| -rw-r--r-- | g10/sig-check.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/g10/sig-check.c b/g10/sig-check.c index 0eb29eafb..4cb1ea65e 100644 --- a/g10/sig-check.c +++ b/g10/sig-check.c @@ -64,6 +64,34 @@ signature_check( PKT_signature *sig, MD_HANDLE digest ) rc = do_check( pk, sig, digest ); free_public_key( pk ); + + if( !rc && is_status_enabled() + && ( sig->pubkey_algo == PUBKEY_ALGO_DSA + || sig->pubkey_algo == PUBKEY_ALGO_ELGAMAL ) ) { + /* If we are using these public key algorithms we can + * calculate an unique signature id, which may be useful + * in an application to prevent replac attacks */ + MD_HANDLE md; + int i, nsig = pubkey_get_nsig( sig->pubkey_algo ); + byte *p; + + md = md_open( DIGEST_ALGO_RMD160, 0); + for(i=0; i < nsig; i++ ) { + unsigned n = mpi_get_nbits( sig->data[i]); + + md_putc( md, n>>8); + md_putc( md, n ); + p = mpi_get_buffer( sig->data[i], &n, NULL ); + md_write( md, p, n ); + m_free(p); + } + md_final( md ); + p = make_radix64_string( md_read( md, 0 ), 20 ); + write_status_text( STATUS_SIG_ID, p ); + m_free(p); + md_close(md); + } + return rc; } |