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Changed default hash algorithm preferences
This commit is contained in:
Werner Koch
parent
2e835fd6ab
commit
e50cac1d84
11
NEWS
11
NEWS
@ -1,14 +1,17 @@
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Noteworthy changes in version 2.0.13
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-------------------------------------------------
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* GPG now generates 2048 bit RSA keys by default. The default hash
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algorithm preferences has changed to prefer SHA-256 over SHA-1.
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2048 bit DSA keys are now generated to use a 256 bit hash algorithm
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* The envvars XMODIFIERS, GTK_IM_MODULE and QT_IM_MODULE are now
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passed to the Pinentry to make SCIM work.
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* gpgsm --gen-key implements a --batch mode.
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* The GPGSM command --gen-key features a --batch mode and implements
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all features of gpgsm-gencert.sh in standard mode.
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* gpgsm --gen-key implements all features of gpgsm-gencert.sh.
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* New option --re-import for gpgsm's IMPORT server command.
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* New option --re-import for GPGSM's IMPORT server command.
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* Minor bug fixes.
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@ -1,3 +1,14 @@
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2009-07-09 Werner Koch <wk@g10code.com>
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* gpg.c (main): Remove the SHA-1 default from the personal digest
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list. This was used in the past as a hack to avoid preferring
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RMD-160.
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* keygen.c (keygen_set_std_prefs): Remove RMD-160 from the list.
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Change order to SHA-256, SHA-1, SHA-384, SHA-512, SHA-224.
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(gen_dsa): Use a 256 bit Q for 2048 bit P. Runt to FIPS allowed
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values in non-expert mode.
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2009-07-07 Werner Koch <wk@g10code.com>
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* gpg.c (set_opt_session_env): New.
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@ -3195,11 +3195,6 @@ main (int argc, char **argv)
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keygen_set_std_prefs(opt.def_preference_list,0))
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log_error(_("invalid default preferences\n"));
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/* We provide defaults for the personal digest list. This is
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SHA-1. */
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if(!pers_digest_list)
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pers_digest_list="h2";
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if(pers_cipher_list &&
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keygen_set_std_prefs(pers_cipher_list,PREFTYPE_SYM))
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log_error(_("invalid personal cipher preferences\n"));
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43
g10/keygen.c
43
g10/keygen.c
@ -1,6 +1,6 @@
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/* keygen.c - generate a key pair
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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* 2006, 2007 Free Software Foundation, Inc.
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* 2006, 2007, 2009 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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@ -301,7 +301,7 @@ keygen_set_std_prefs (const char *string,int personal)
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byte sym[MAX_PREFS], hash[MAX_PREFS], zip[MAX_PREFS];
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int nsym=0, nhash=0, nzip=0, val, rc=0;
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int mdc=1, modify=0; /* mdc defaults on, modify defaults off. */
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char dummy_string[45+1]; /* Enough for 15 items. */
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char dummy_string[20*4+1]; /* Enough for 20 items. */
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if (!string || !ascii_strcasecmp (string, "default"))
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{
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@ -345,15 +345,29 @@ keygen_set_std_prefs (const char *string,int personal)
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if ( !openpgp_cipher_test_algo (CIPHER_ALGO_IDEA) )
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strcat(dummy_string,"S1 ");
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/* SHA-1 */
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strcat(dummy_string,"H2 ");
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/* The default hash algo order is:
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SHA-256, SHA-1, SHA-384, SHA-512, SHA-224.
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Ordering SHA-1 before SHA-384 might be viewed as a bit
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strange; it is done because we expect that soon enough
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SHA-3 will be available and at that point there should
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be no more need for SHA-384 etc. Anyway this order is
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just a default and can easily be changed by a config
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option. */
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if (!openpgp_md_test_algo (DIGEST_ALGO_SHA256))
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strcat (dummy_string, "H8 ");
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/* RIPEMD160 */
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if (!openpgp_md_test_algo(DIGEST_ALGO_RMD160))
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strcat(dummy_string,"H3 ");
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strcat (dummy_string, "H2 "); /* SHA-1 */
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if (!openpgp_md_test_algo (DIGEST_ALGO_SHA384))
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strcat (dummy_string, "H9 ");
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if (!openpgp_md_test_algo (DIGEST_ALGO_SHA512))
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strcat (dummy_string, "H10 ");
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if (!openpgp_md_test_algo (DIGEST_ALGO_SHA224))
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strcat (dummy_string, "H11 ");
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/* ZLIB */
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strcat(dummy_string,"Z2 ");
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@ -507,7 +521,8 @@ keygen_set_std_prefs (const char *string,int personal)
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/* Return a fake user ID containing the preferences. Caller must
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free. */
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PKT_user_id *keygen_get_std_prefs(void)
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PKT_user_id *
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keygen_get_std_prefs(void)
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{
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int i,j=0;
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PKT_user_id *uid=xmalloc_clear(sizeof(PKT_user_id));
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@ -1280,6 +1295,14 @@ gen_dsa (unsigned int nbits, KBNODE pub_root, KBNODE sec_root, DEK *dek,
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log_info(_("keysize rounded up to %u bits\n"), nbits );
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}
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/* To comply with FIPS rules we round up to the next value unless in
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expert mode. */
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if (!opt.expert && nbits > 1024 && (nbits % 1024))
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{
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nbits = ((nbits + 1023) / 1024) * 1024;
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log_info(_("keysize rounded up to %u bits\n"), nbits );
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}
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/*
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Figure out a q size based on the key size. FIPS 180-3 says:
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@ -1291,11 +1314,11 @@ gen_dsa (unsigned int nbits, KBNODE pub_root, KBNODE sec_root, DEK *dek,
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2048/256 is an odd pair since there is also a 2048/224 and
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3072/256. Matching sizes is not a very exact science.
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We'll do 256 qbits for nbits over 2048, 224 for nbits over 1024
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We'll do 256 qbits for nbits over 2047, 224 for nbits over 1024
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but less than 2048, and 160 for 1024 (DSA1).
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*/
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if (nbits > 2048)
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if (nbits > 2047)
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qbits = 256;
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else if ( nbits > 1024)
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qbits = 224;
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