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libgcrypt.25806
libgcrypt-fips-dsa.patch
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File libgcrypt-fips-dsa.patch of Package libgcrypt.25806
Index: libgcrypt-1.6.1/cipher/dsa.c =================================================================== --- libgcrypt-1.6.1.orig/cipher/dsa.c 2015-02-16 15:26:00.730555959 +0100 +++ libgcrypt-1.6.1/cipher/dsa.c 2015-02-16 18:33:34.829991781 +0100 @@ -67,7 +67,7 @@ static const char *dsa_names[] = /* A sample 1024 bit DSA key used for the selftests. */ -static const char sample_secret_key[] = +static const char sample_secret_key_1024[] = "(private-key" " (dsa" " (p #00AD7C0025BA1A15F775F3F2D673718391D00456978D347B33D7B49E7F32EDAB" @@ -85,7 +85,7 @@ static const char sample_secret_key[] = " 42CAA7DC289F0C5A9D155F02D3D551DB741A81695B74D4C8F477F9C7838EB0FB#)" " (x #11D54E4ADBD3034160F2CED4B7CD292A4EBF3EC0#)))"; /* A sample 1024 bit DSA key used for the selftests (public only). */ -static const char sample_public_key[] = +static const char sample_public_key_1024[] = "(public-key" " (dsa" " (p #00AD7C0025BA1A15F775F3F2D673718391D00456978D347B33D7B49E7F32EDAB" @@ -102,6 +102,23 @@ static const char sample_public_key[] = " 6E45831AB811EEE848EBB24D9F5F2883B6E5DDC4C659DEF944DCFD80BF4D0A20" " 42CAA7DC289F0C5A9D155F02D3D551DB741A81695B74D4C8F477F9C7838EB0FB#)))"; +/* 2048 DSA key from RFC 6979 A.2.2 */ +static const char sample_public_key_2048[] = +"(public-key" +" (dsa" +" (p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q #F2C3119374CE76C9356990B465374A17F23F9ED35089BD969F61C6DDE9998C1F#)" +" (g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y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static const char sample_secret_key_2048[] = +"(private-key" +" (dsa" +" (p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q #F2C3119374CE76C9356990B465374A17F23F9ED35089BD969F61C6DDE9998C1F#)" +" (g #5C7FF6B06F8F143FE8288433493E4769C4D988ACE5BE25A0E24809670716C613D7B0CEE6932F8FAA7C44D2CB24523DA53FBE4F6EC3595892D1AA58C4328A06C46A15662E7EAA703A1DECF8BBB2D05DBE2EB956C142A338661D10461C0D135472085057F3494309FFA73C611F78B32ADBB5740C361C9F35BE90997DB2014E2EF5AA61782F52ABEB8BD6432C4DD097BC5423B285DAFB60DC364E8161F4A2A35ACA3A10B1C4D203CC76A470A33AFDCBDD92959859ABD8B56E1725252D78EAC66E71BA9AE3F1DD2487199874393CD4D832186800654760E1E34C09E4D155179F9EC0DC4473F996BDCE6EED1CABED8B6F116F7AD9CF505DF0F998E34AB27514B0FFE7#)" +" (y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x #69C7548C21D0DFEA6B9A51C9EAD4E27C33D3B3F180316E5BCAB92C933F0E4DBC#)))"; @@ -369,6 +386,8 @@ generate_fips186 (DSA_secret_key *sk, un gcry_mpi_t value_x = NULL; /* The secret exponent. */ gcry_mpi_t value_h = NULL; /* Helper. */ gcry_mpi_t value_e = NULL; /* Helper. */ + gcry_mpi_t value_c = NULL; /* helper for x */ + gcry_mpi_t value_qm2 = NULL; /* q - 2 */ /* Preset return values. */ *r_counter = 0; @@ -389,9 +408,7 @@ generate_fips186 (DSA_secret_key *sk, un /* Check that QBITS and NBITS match the standard. Note that FIPS 186-3 uses N for QBITS and L for NBITS. */ - if (nbits == 1024 && qbits == 160) - ; - else if (nbits == 2048 && qbits == 224) + if (nbits == 2048 && qbits == 224) ; else if (nbits == 2048 && qbits == 256) ; @@ -424,21 +441,18 @@ generate_fips186 (DSA_secret_key *sk, un &initial_seed.seedlen); } - /* Fixme: Enable 186-3 after it has been approved and after fixing - the generation function. */ - /* if (use_fips186_2) */ - (void)use_fips186_2; - ec = _gcry_generate_fips186_2_prime (nbits, qbits, + if (use_fips186_2) + ec = _gcry_generate_fips186_2_prime (nbits, qbits, initial_seed.seed, initial_seed.seedlen, &prime_q, &prime_p, r_counter, r_seed, r_seedlen); - /* else */ - /* ec = _gcry_generate_fips186_3_prime (nbits, qbits, NULL, 0, */ - /* &prime_q, &prime_p, */ - /* r_counter, */ - /* r_seed, r_seedlen, NULL); */ + else + ec = _gcry_generate_fips186_3_prime (nbits, qbits, NULL, 0, + &prime_q, &prime_p, + r_counter, + r_seed, r_seedlen, NULL); sexp_release (initial_seed.sexp); if (ec) goto leave; @@ -459,17 +473,24 @@ generate_fips186 (DSA_secret_key *sk, un while (!mpi_cmp_ui (value_g, 1)); /* Continue until g != 1. */ } - - /* Select a random number x with: 0 < x < q */ + value_c = mpi_snew (qbits); value_x = mpi_snew (qbits); + value_qm2 = mpi_snew (qbits); + mpi_sub_ui (value_qm2, prime_q, 2); + + /* FIPS 186-4 B.1.2 steps 4-6 */ do { if( DBG_CIPHER ) progress('.'); - _gcry_mpi_randomize (value_x, qbits, GCRY_VERY_STRONG_RANDOM); - mpi_clear_highbit (value_x, qbits+1); + _gcry_mpi_randomize (value_c, qbits, GCRY_VERY_STRONG_RANDOM); + mpi_clear_highbit (value_c, qbits+1); } - while (!(mpi_cmp_ui (value_x, 0) > 0 && mpi_cmp (value_x, prime_q) < 0)); + while (!(mpi_cmp_ui (value_c, 0) > 0 && mpi_cmp (value_c, value_qm2) < 0)); + /* while (mpi_cmp (value_c, value_qm2) > 0); */ + + /* x = c + 1 */ + mpi_add_ui(value_x, value_c, 1); /* y = g^x mod p */ value_y = mpi_alloc_like (prime_p); @@ -502,6 +523,8 @@ generate_fips186 (DSA_secret_key *sk, un _gcry_mpi_release (value_x); _gcry_mpi_release (value_h); _gcry_mpi_release (value_e); + _gcry_mpi_release (value_c); + _gcry_mpi_release (value_qm2); /* As a last step test this keys (this should never fail of course). */ if (!ec && test_keys (sk, qbits) ) @@ -1154,25 +1177,42 @@ dsa_get_nbits (gcry_sexp_t parms) */ static const char * -selftest_sign_1024 (gcry_sexp_t pkey, gcry_sexp_t skey) +selftest_sign (gcry_sexp_t pkey, gcry_sexp_t skey) { + /* Sample data from RFC 6979 section A.2.2, hash is of message "sample" */ static const char sample_data[] = - "(data (flags raw)" - " (value #a0b1c2d3e4f500102030405060708090a1b2c3d4#))"; + "(data (flags rfc6979)" + " (hash sha256 #af2bdbe1aa9b6ec1e2ade1d694f41fc71a831d0268e9891562113d8a62add1bf#))"; static const char sample_data_bad[] = - "(data (flags raw)" - " (value #a0b1c2d3e4f510102030405060708090a1b2c3d4#))"; + "(data (flags rfc6979)" + " (hash sha256 #bf2bdbe1aa9b6ec1e2ade1d694f41fc71a831d0268e9891562113d8a62add1bf#))"; + static const char signature_r[] = + "eace8bdbbe353c432a795d9ec556c6d021f7a03f42c36e9bc87e4ac7932cc809"; + static const char signature_s[] = + "7081e175455f9247b812b74583e9e94f9ea79bd640dc962533b0680793a38d53"; const char *errtxt = NULL; gcry_error_t err; gcry_sexp_t data = NULL; gcry_sexp_t data_bad = NULL; gcry_sexp_t sig = NULL; + gcry_sexp_t l1 = NULL; + gcry_sexp_t l2 = NULL; + gcry_mpi_t r = NULL; + gcry_mpi_t s = NULL; + gcry_mpi_t calculated_r = NULL; + gcry_mpi_t calculated_s = NULL; + int cmp; err = sexp_sscan (&data, NULL, sample_data, strlen (sample_data)); if (!err) err = sexp_sscan (&data_bad, NULL, sample_data_bad, strlen (sample_data_bad)); + if (!err) + err = _gcry_mpi_scan (&r, GCRYMPI_FMT_HEX, signature_r, 0, NULL); + if (!err) + err = _gcry_mpi_scan (&s, GCRYMPI_FMT_HEX, signature_s, 0, NULL); + if (err) { errtxt = "converting data failed"; @@ -1185,6 +1225,45 @@ selftest_sign_1024 (gcry_sexp_t pkey, gc errtxt = "signing failed"; goto leave; } + + /* check against known signature */ + errtxt = "signature validity failed"; + l1 = _gcry_sexp_find_token (sig, "sig-val", 0); + if (!l1) + goto leave; + l2 = _gcry_sexp_find_token (l1, "dsa", 0); + if (!l2) + goto leave; + + sexp_release (l1); + l1 = l2; + + l2 = _gcry_sexp_find_token (l1, "r", 0); + if (!l2) + goto leave; + calculated_r = _gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG); + if (!calculated_r) + goto leave; + + l2 = _gcry_sexp_find_token (l1, "s", 0); + if (!l2) + goto leave; + calculated_s = _gcry_sexp_nth_mpi (l2, 1, GCRYMPI_FMT_USG); + if (!calculated_s) + goto leave; + + errtxt = "known sig check failed"; + + cmp = _gcry_mpi_cmp (r, calculated_r); + if (cmp) + goto leave; + cmp = _gcry_mpi_cmp (s, calculated_s); + if (cmp) + goto leave; + + errtxt = NULL; + + err = _gcry_pk_verify (sig, data, pkey); if (err) { @@ -1208,7 +1287,7 @@ selftest_sign_1024 (gcry_sexp_t pkey, gc static gpg_err_code_t -selftests_dsa (selftest_report_func_t report) +selftests_dsa_2048 (selftest_report_func_t report) { const char *what; const char *errtxt; @@ -1218,10 +1297,10 @@ selftests_dsa (selftest_report_func_t re /* Convert the S-expressions into the internal representation. */ what = "convert"; - err = sexp_sscan (&skey, NULL, sample_secret_key, strlen (sample_secret_key)); + err = sexp_sscan (&skey, NULL, sample_secret_key_2048, strlen (sample_secret_key_2048)); if (!err) err = sexp_sscan (&pkey, NULL, - sample_public_key, strlen (sample_public_key)); + sample_public_key_2048, strlen (sample_public_key_2048)); if (err) { errtxt = _gcry_strerror (err); @@ -1237,7 +1316,7 @@ selftests_dsa (selftest_report_func_t re } what = "sign"; - errtxt = selftest_sign_1024 (pkey, skey); + errtxt = selftest_sign (pkey, skey); if (errtxt) goto failed; @@ -1265,7 +1344,7 @@ run_selftests (int algo, int extended, s switch (algo) { case GCRY_PK_DSA: - ec = selftests_dsa (report); + ec = selftests_dsa_2048 (report); break; default: ec = GPG_ERR_PUBKEY_ALGO; @@ -1276,7 +1355,6 @@ run_selftests (int algo, int extended, s } - gcry_pk_spec_t _gcry_pubkey_spec_dsa = { Index: libgcrypt-1.6.1/cipher/primegen.c =================================================================== --- libgcrypt-1.6.1.orig/cipher/primegen.c 2015-02-16 15:26:00.730555959 +0100 +++ libgcrypt-1.6.1/cipher/primegen.c 2015-02-16 18:35:53.623282589 +0100 @@ -1649,7 +1649,7 @@ _gcry_generate_fips186_3_prime (unsigned gpg_err_code_t ec; unsigned char seed_help_buffer[256/8]; /* Used to hold a generated SEED. */ unsigned char *seed_plus; /* Malloced buffer to hold SEED+x. */ - unsigned char digest[256/8]; /* Helper buffer for SHA-1 digest. */ + unsigned char digest[256/8]; /* Helper buffer for SHA-2 digest. */ gcry_mpi_t val_2 = NULL; /* Helper for the prime test. */ gcry_mpi_t tmpval = NULL; /* Helper variable. */ int hashalgo; /* The id of the Approved Hash Function. */ @@ -1668,9 +1668,7 @@ _gcry_generate_fips186_3_prime (unsigned /* Step 1: Check the requested prime lengths. */ /* Note that due to the size of our buffers QBITS is limited to 256. */ - if (pbits == 1024 && qbits == 160) - hashalgo = GCRY_MD_SHA1; - else if (pbits == 2048 && qbits == 224) + if (pbits == 2048 && qbits == 224) hashalgo = GCRY_MD_SHA224; else if (pbits == 2048 && qbits == 256) hashalgo = GCRY_MD_SHA256; @@ -1739,7 +1737,7 @@ _gcry_generate_fips186_3_prime (unsigned } _gcry_mpi_release (prime_q); prime_q = NULL; ec = _gcry_mpi_scan (&prime_q, GCRYMPI_FMT_USG, - value_u, sizeof value_u, NULL); + value_u, qbits/8, NULL); if (ec) goto leave; mpi_set_highbit (prime_q, qbits-1 ); @@ -1784,11 +1782,11 @@ _gcry_generate_fips186_3_prime (unsigned if (seed_plus[i]) break; } - _gcry_md_hash_buffer (GCRY_MD_SHA1, digest, seed_plus, seedlen); + _gcry_md_hash_buffer (hashalgo, digest, seed_plus, seedlen); _gcry_mpi_release (tmpval); tmpval = NULL; ec = _gcry_mpi_scan (&tmpval, GCRYMPI_FMT_USG, - digest, sizeof digest, NULL); + digest, qbits/8, NULL); if (ec) goto leave; if (value_j == value_n) @@ -1824,11 +1822,13 @@ _gcry_generate_fips186_3_prime (unsigned } /* Step 12: Save p, q, counter and seed. */ +/* log_debug ("fips186-3 pbits p=%u q=%u counter=%d\n", mpi_get_nbits (prime_p), mpi_get_nbits (prime_q), counter); log_printhex ("fips186-3 seed", seed, seedlen); log_printmpi ("fips186-3 p", prime_p); log_printmpi ("fips186-3 q", prime_q); +*/ if (r_q) { *r_q = prime_q;
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