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Fix pkdecrypt.c, now works with the test vector.

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Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2024-03-21 17:23:58 +09:00
parent f901b38cd0
commit e17d822492
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GPG Key ID: 640114AF89DE6054
1 changed files with 7 additions and 8 deletions
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15
agent/pkdecrypt.c
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@ -274,6 +274,9 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
goto leave;
}
encrypted_sessionkey++;
/* skip sym algo */
encrypted_sessionkey_len--;
encrypted_sessionkey++;
/* Fistly, ECC. */
gcry_sexp_extract_param (s_skey0, NULL, "/q/d",
@ -298,7 +301,6 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
ecc_ct, ecc_ct_len,
ecc_ecdh, 32,
NULL, 0);
log_printhex (ecc_ecdh, 32, "ecc ECDH: ");
iov[0].data = ecc_ecdh;
iov[0].off = 0;
@ -310,7 +312,6 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
iov[2].off = 0;
iov[2].len = 32;
gcry_md_hash_buffers (GCRY_MD_SHA3_256, 0, ecc_ss, iov, 3);
log_printhex (ecc_ss, 32, "eccKeyShare: ");
/* Secondly, ML-KEM */
gcry_sexp_extract_param (s_skey1, NULL, "/s", &mlkem_sk_mpi, NULL);
@ -327,7 +328,6 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
mpi_release (mlkem_sk_mpi);
log_printhex (mlkem_ss, GCRY_KEM_MLKEM768_SHARED_LEN, "mlkemKeyShare: ");
/* Then, combine two shared secrets into one */
// multiKeyCombine(eccKeyShare, eccCipherText,
@ -360,7 +360,6 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
// KMAC256(K,X,L,S):
// newX = bytepad(encode_string(K), 136) || X || right_encode(L)
// cSHAKE256(newX,L,"KMAC",S)
len = 4 + 32 + 32 + GCRY_KEM_MLKEM768_SHARED_LEN + GCRY_KEM_MLKEM768_ENCAPS_LEN;
iov[0].data = "KMAC";
iov[0].off = 0;
@ -422,11 +421,11 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
iov[12].off = 0;
iov[12].len = 3;
err = gcry_md_hash_buffers_extract (GCRY_MD_CSHAKE256, 0, kekkey, kekkeylen,
iov, 13);
mpi_release (ecc_ct_mpi);
mpi_release (mlkem_ct_mpi);
gcry_md_hash_buffers_extract (GCRY_MD_CSHAKE256, 0, kekkey, kekkeylen,
iov, 13);
if (DBG_CRYPTO)
{
log_printhex (kekkey, kekkeylen, "KEK key: ");
@ -445,8 +444,8 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
err = gcry_cipher_setkey (hd, kekkey, kekkeylen);
sessionkey_encoded_len = encrypted_sessionkey_len - 8;
gcry_cipher_decrypt (hd, sessionkey_encoded, sessionkey_encoded_len,
encrypted_sessionkey, encrypted_sessionkey_len);
err = gcry_cipher_decrypt (hd, sessionkey_encoded, sessionkey_encoded_len,
encrypted_sessionkey, encrypted_sessionkey_len);
gcry_cipher_close (hd);
mpi_release (encrypted_sessionkey_mpi);