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Sylvester Version

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This commit is contained in:
Werner Koch 1997-12-31 12:32:54 +00:00
parent c351df1dc5
commit 4d2636eafe
20 changed files with 1971 additions and 144 deletions
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54
g10/seskey.c
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@ -103,13 +103,14 @@ encode_session_key( DEK *dek, unsigned nbits )
/****************
* Encode a ripemd160 message digest of LEN bytes into NBITS.
* returns: A mpi with the session key (caller must free)
* RMD160 Object ID is 1.3.36.3.2.1
*/
MPI
encode_rmd160_value( byte *md, unsigned len, unsigned nbits )
{
static byte asn[18] = /* FIXME: need other values*/
{ 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86,0x48,
0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10 };
static byte asn[15] =
{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x24, 0x03,
0x02, 0x01, 0x05, 0x00, 0x04, 0x14 };
int nframe = (nbits+7) / 8;
byte *p;
MPI frame;
@ -120,7 +121,7 @@ encode_rmd160_value( byte *md, unsigned len, unsigned nbits )
/* We encode the MD in this way:
*
* 0 A PAD(n bytes) 0 ASN(18 bytes) MD(20 bytes)
* 0 A PAD(n bytes) 0 ASN(15 bytes) MD(20 bytes)
*
* PAD consists of FF bytes.
*/
@ -128,7 +129,47 @@ encode_rmd160_value( byte *md, unsigned len, unsigned nbits )
n = 0;
for(i=20-1; i >= 0; i--, n++ )
mpi_putbyte(frame, n, md[i] );
for( i=18-1; i >= 0; i--, n++ )
for( i=15-1; i >= 0; i--, n++ )
mpi_putbyte(frame, n, asn[i] );
mpi_putbyte(frame, n++, 0 );
while( n < nframe-2 )
mpi_putbyte(frame, n++, 0xff );
mpi_putbyte(frame, n++, DIGEST_ALGO_RMD160 );
mpi_putbyte(frame, n++, 0 );
assert( n == nframe );
return frame;
}
/****************
* Encode a sha-1 message digest of LEN bytes into NBITS.
* returns: A mpi with the session key (caller must free)
* SHA-1 Objet ID is 1.3.14.3.2.26
*/
MPI
encode_sha1_value( byte *md, unsigned len, unsigned nbits )
{
static byte asn[15] =
{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03,
0x02, 0x1a, 0x05, 0x00, 0x04, 0x14 };
int nframe = (nbits+7) / 8;
byte *p;
MPI frame;
int i,n,c;
if( (nbits % BITS_PER_MPI_LIMB) || nframe < 42 || len != 20 )
log_bug("can't encode a %d bit MD into a %d bits frame\n",len*8, nbits);
/* We encode the MD in this way:
*
* 0 A PAD(n bytes) 0 ASN(15 bytes) MD(20 bytes)
*
* PAD consists of FF bytes.
*/
frame = mpi_alloc_secure( nframe / BYTES_PER_MPI_LIMB );
n = 0;
for(i=20-1; i >= 0; i--, n++ )
mpi_putbyte(frame, n, md[i] );
for( i=15-1; i >= 0; i--, n++ )
mpi_putbyte(frame, n, asn[i] );
mpi_putbyte(frame, n++, 0 );
while( n < nframe-2 )
@ -143,6 +184,7 @@ encode_rmd160_value( byte *md, unsigned len, unsigned nbits )
/****************
* Encode a md5 message digest of LEN bytes into NBITS.
* returns: A mpi with the session key (caller must free)
* MD5 Object ID is 1.2.840.113549.2.5
*/
MPI
encode_md5_value( byte *md, unsigned len, unsigned nbits )
@ -187,6 +229,8 @@ encode_md_value( MD_HANDLE *md, unsigned nbits )
return encode_md5_value( p, 16, nbits );
else if( md->algo == DIGEST_ALGO_RMD160 )
return encode_rmd160_value( p, 20, nbits );
else if( md->algo == DIGEST_ALGO_SHA1 )
return encode_sha1_value( p, 20, nbits );
else
log_bug(NULL);
}