mirror of git://git.gnupg.org/gnupg.git
agent:kem: More fix for PQC KEM with X448.
* agent/pkdecrypt.c (struct ecc_params): Remove NAME_LEN field. (ecc_table): Update. (get_ecc_params): Use strcmp. (composite_pgp_kem_decrypt): Fix the call of gnupg_kem_combiner. -- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
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65833eefb2
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@ -175,7 +175,6 @@ reverse_buffer (unsigned char *buffer, unsigned int length)
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struct ecc_params
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struct ecc_params
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{
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{
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int name_len;
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const char *curve;
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const char *curve;
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size_t pubkey_len; /* Pubkey in the SEXP representation. */
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size_t pubkey_len; /* Pubkey in the SEXP representation. */
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size_t scalar_len;
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size_t scalar_len;
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@ -189,39 +188,39 @@ struct ecc_params
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static const struct ecc_params ecc_table[] =
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static const struct ecc_params ecc_table[] =
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{
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{
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{
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{
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10, "Curve25519",
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"Curve25519",
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33, 32, 32, 32,
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33, 32, 32, 32,
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GCRY_MD_SHA3_256, GCRY_KEM_RAW_X25519,
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GCRY_MD_SHA3_256, GCRY_KEM_RAW_X25519,
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1
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1
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},
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},
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{
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{
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4, "X448",
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"X448",
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56, 56, 56, 64,
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56, 56, 56, 64,
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GCRY_MD_SHA3_512, GCRY_KEM_RAW_X448,
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GCRY_MD_SHA3_512, GCRY_KEM_RAW_X448,
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0
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0
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},
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},
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{
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{
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15, "brainpoolP256r1",
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"brainpoolP256r1",
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65, 32, 65, 32,
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65, 32, 65, 32,
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GCRY_MD_SHA3_256, GCRY_KEM_RAW_BP256,
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GCRY_MD_SHA3_256, GCRY_KEM_RAW_BP256,
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0
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0
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},
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},
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{
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{
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15, "brainpoolP384r1",
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"brainpoolP384r1",
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97, 48, 97, 64,
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97, 48, 97, 64,
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GCRY_MD_SHA3_512, GCRY_KEM_RAW_BP384,
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GCRY_MD_SHA3_512, GCRY_KEM_RAW_BP384,
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0
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0
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},
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},
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{ 0, NULL, 0, 0, 0, 0, 0, 0, 0 }
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{ NULL, 0, 0, 0, 0, 0, 0, 0 }
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};
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};
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static const struct ecc_params *
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static const struct ecc_params *
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get_ecc_params (const char *curve, size_t curve_len)
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get_ecc_params (const char *curve)
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{
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{
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int i, name_len;
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int i;
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for (i = 0; (name_len = ecc_table[i].name_len); i++)
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for (i = 0; ecc_table[i].curve; i++)
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if (name_len == curve_len && !memcmp (ecc_table[i].curve, curve, name_len))
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if (!strcmp (ecc_table[i].curve, curve))
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return &ecc_table[i];
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return &ecc_table[i];
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return NULL;
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return NULL;
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@ -292,7 +291,7 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
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gcry_buffer_t fixed_info = { 0, 0, 0, NULL };
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gcry_buffer_t fixed_info = { 0, 0, 0, NULL };
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gcry_sexp_t curve = NULL;
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gcry_sexp_t curve = NULL;
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const char *curve_name;
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char *curve_name = NULL;
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err = agent_key_from_file (ctrl, NULL, desc_text,
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err = agent_key_from_file (ctrl, NULL, desc_text,
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ctrl->keygrip, &shadow_info,
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ctrl->keygrip, &shadow_info,
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@ -347,8 +346,8 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
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goto leave;
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goto leave;
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}
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}
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curve_name = gcry_sexp_nth_data (curve, 1, &len);
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curve_name = gcry_sexp_nth_string (curve, 1);
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ecc = get_ecc_params (curve_name, len);
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ecc = get_ecc_params (curve_name);
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if (!ecc)
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if (!ecc)
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{
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{
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if (opt.verbose)
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if (opt.verbose)
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@ -436,7 +435,7 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
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log_printhex (ecc_ecdh, ecc->point_len, "ECC ecdh:");
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log_printhex (ecc_ecdh, ecc->point_len, "ECC ecdh:");
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err = gnupg_ecc_kem_kdf (ecc_ss, ecc->shared_len, ecc->hash_algo,
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err = gnupg_ecc_kem_kdf (ecc_ss, ecc->shared_len, ecc->hash_algo,
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ecc_ecdh, ecc->scalar_len, ecc_ct, ecc->point_len,
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ecc_ecdh, ecc->point_len, ecc_ct, ecc->point_len,
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ecc_pk, ecc->point_len);
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ecc_pk, ecc->point_len);
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if (err)
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if (err)
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{
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{
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@ -509,9 +508,8 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
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/* Then, combine two shared secrets and ciphertexts into one KEK */
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/* Then, combine two shared secrets and ciphertexts into one KEK */
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err = gnupg_kem_combiner (kek, kek_len,
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err = gnupg_kem_combiner (kek, kek_len,
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ecc_ss, 32, ecc_ct, 32,
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ecc_ss, ecc->shared_len, ecc_ct, ecc->point_len,
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mlkem_ss, GCRY_KEM_MLKEM768_SHARED_LEN,
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mlkem_ss, mlkem_ss_len, mlkem_ct, mlkem_ct_len,
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mlkem_ct, GCRY_KEM_MLKEM768_CIPHER_LEN,
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fixed_info.data, fixed_info.size);
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fixed_info.data, fixed_info.size);
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if (err)
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if (err)
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{
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{
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@ -577,6 +575,7 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
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mpi_release (encrypted_sessionkey_mpi);
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mpi_release (encrypted_sessionkey_mpi);
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gcry_free (fixed_info.data);
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gcry_free (fixed_info.data);
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gcry_sexp_release (curve);
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gcry_sexp_release (curve);
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xfree (curve_name);
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gcry_sexp_release (s_skey0);
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gcry_sexp_release (s_skey0);
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gcry_sexp_release (s_skey1);
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gcry_sexp_release (s_skey1);
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return err;
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return err;
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