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* keyid.c (do_fingerprint_md): Properly handle hashing of keys that we

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don't know the structure of by using the opaque MPI.
(do_fingerprint_md_sk): We cannot calculate the fingerprint from a secret
key unless we know the structure (since we can't leave off the secret key
parts), so fail early..... (keyid_from_sk, fingerprint_from_sk): .... and
return all zeroes.
This commit is contained in:
David Shaw 2003-12-10 01:27:55 +00:00
parent 5f8ec65801
commit 4830eb7cae
2 changed files with 64 additions and 28 deletions
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9
g10/ChangeLog
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@ -1,3 +1,12 @@
2003-12-09 David Shaw <dshaw@jabberwocky.com>
* keyid.c (do_fingerprint_md): Properly handle hashing of keys
that we don't know the structure of by using the opaque MPI.
(do_fingerprint_md_sk): We cannot calculate the fingerprint from a
secret key unless we know the structure (since we can't leave off
the secret key parts), so fail early.....
(keyid_from_sk, fingerprint_from_sk): .... and return all zeroes.
2003-12-03 David Shaw <dshaw@jabberwocky.com>
* g10.c (strusage, main): Show development version warning in

83
g10/keyid.c
View File

@ -1,5 +1,5 @@
/* keyid.c - key ID and fingerprint handling
* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
* Copyright (C) 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
@ -61,11 +61,18 @@ do_fingerprint_md( PKT_public_key *pk )
md = md_open( pk->version < 4 ? DIGEST_ALGO_RMD160 : DIGEST_ALGO_SHA1, 0);
n = pk->version < 4 ? 8 : 6;
for(i=0; i < npkey; i++ ) {
nb[i] = mpi_get_nbits(pk->pkey[i]);
pp[i] = mpi_get_buffer( pk->pkey[i], nn+i, NULL );
n += 2 + nn[i];
}
if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
{
pp[0]=mpi_get_opaque(pk->pkey[0],&nn[0]);
n+=nn[0];
}
else
for(i=0; i < npkey; i++ )
{
nb[i] = mpi_get_nbits(pk->pkey[i]);
pp[i] = mpi_get_buffer( pk->pkey[i], nn+i, NULL );
n += 2 + nn[i];
}
md_putc( md, 0x99 ); /* ctb */
md_putc( md, n >> 8 ); /* 2 byte length header */
@ -92,12 +99,17 @@ do_fingerprint_md( PKT_public_key *pk )
md_putc( md, a );
}
md_putc( md, pk->pubkey_algo );
for(i=0; i < npkey; i++ ) {
md_putc( md, nb[i]>>8);
md_putc( md, nb[i] );
md_write( md, pp[i], nn[i] );
m_free(pp[i]);
}
if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
md_write(md,pp[0],nn[0]);
else
for(i=0; i < npkey; i++ )
{
md_putc( md, nb[i]>>8);
md_putc( md, nb[i] );
md_write( md, pp[i], nn[i] );
m_free(pp[i]);
}
md_final( md );
return md;
@ -110,13 +122,16 @@ do_fingerprint_md_sk( PKT_secret_key *sk )
int npkey = pubkey_get_npkey( sk->pubkey_algo ); /* npkey is correct! */
int i;
if(npkey==0)
return NULL;
pk.pubkey_algo = sk->pubkey_algo;
pk.version = sk->version;
pk.timestamp = sk->timestamp;
pk.expiredate = sk->expiredate;
pk.pubkey_algo = sk->pubkey_algo;
for( i=0; i < npkey; i++ )
pk.pkey[i] = sk->skey[i];
pk.pkey[i] = sk->skey[i];
return do_fingerprint_md( &pk );
}
@ -142,11 +157,16 @@ keyid_from_sk( PKT_secret_key *sk, u32 *keyid )
const byte *dp;
MD_HANDLE md;
md = do_fingerprint_md_sk(sk);
dp = md_read( md, 0 );
keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
lowbits = keyid[1];
md_close(md);
if(md)
{
dp = md_read( md, 0 );
keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
lowbits = keyid[1];
md_close(md);
}
else
keyid[0]=keyid[1]=0;
}
return lowbits;
@ -501,18 +521,25 @@ fingerprint_from_sk( PKT_secret_key *sk, byte *array, size_t *ret_len )
else {
MD_HANDLE md;
md = do_fingerprint_md_sk(sk);
dp = md_read( md, 0 );
len = md_digest_length( md_get_algo( md ) );
assert( len <= MAX_FINGERPRINT_LEN );
if( !array )
array = m_alloc( len );
memcpy(array, dp, len );
md_close(md);
if(md)
{
dp = md_read( md, 0 );
len = md_digest_length( md_get_algo( md ) );
assert( len <= MAX_FINGERPRINT_LEN );
if( !array )
array = m_alloc( len );
memcpy(array, dp, len );
md_close(md);
}
else
{
len=MAX_FINGERPRINT_LEN;
if(!array)
array=m_alloc(len);
memset(array,0,len);
}
}
*ret_len = len;
return array;
}