Add DSA library string. Workaround for IIS .key file invalid

ASN1 encoding.

CHANGES

@@ -4,6 +4,10 @@
 
  Changes between 0.9.5a and 0.9.6  [xx XXX 2000]
 
+  *) Add missing DSA library text string. Work around for some IIS
+     key files with invalid SEQUENCE encoding.
+     [Steve Henson]
+
   *) Add a document (doc/standards.txt) that list all kinds of standards
      and so on that are implemented in OpenSSL.
      [Richard Levitte]

crypto/asn1/n_pkey.c

@@ -211,7 +211,11 @@ RSA *d2i_Netscape_RSA(RSA **a, unsigned char **pp, long length, int (*cb)())
 	M_ASN1_BIT_STRING_free(os);
 	c.q=c.p;
 	if ((ret=d2i_Netscape_RSA_2(a,&c.p,c.slen,cb)) == NULL) goto err;
-	c.slen-=(c.p-c.q);
+	/* Note: some versions of IIS key files use length values that are
+	 * too small for the surrounding SEQUENCEs. This following line
+	 * effectively disable length checking.
+	 */
+	c.slen = 0;
 
 	M_ASN1_D2I_Finish(a,RSA_free,ASN1_F_D2I_NETSCAPE_RSA);
 	}

crypto/err/err.c

@@ -137,6 +137,7 @@ static ERR_STRING_DATA ERR_str_libraries[]=
 {ERR_PACK(ERR_LIB_SYS,0,0)		,"system library"},
 {ERR_PACK(ERR_LIB_BN,0,0)		,"bignum routines"},
 {ERR_PACK(ERR_LIB_RSA,0,0)		,"rsa routines"},
+{ERR_PACK(ERR_LIB_DSA,0,0)		,"dsa routines"},
 {ERR_PACK(ERR_LIB_DH,0,0)		,"Diffie-Hellman routines"},
 {ERR_PACK(ERR_LIB_EVP,0,0)		,"digital envelope routines"},
 {ERR_PACK(ERR_LIB_BUF,0,0)		,"memory buffer routines"},