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Fix computation of PQC KEM.

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Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2024-03-20 16:19:14 +09:00
parent c53abc8ffe
commit f901b38cd0
No known key found for this signature in database
GPG Key ID: 640114AF89DE6054
1 changed files with 19 additions and 15 deletions
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34
agent/pkdecrypt.c
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@ -207,8 +207,8 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
gcry_buffer_t iov[13];
unsigned char head136[2];
unsigned char headK[2];
const unsigned char pad[95] = { 0 };
unsigned char headK[3];
const unsigned char pad[94] = { 0 };
unsigned char right_encode_L[3];
unsigned char kekkey[32];
@ -280,7 +280,7 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
&ecc_pk_mpi, &ecc_sk_mpi, NULL);
p = gcry_mpi_get_opaque (ecc_pk_mpi, &nbits);
len = (nbits+7)/8;
memcpy (ecc_pk, p+1, 32);
memcpy (ecc_pk, p+1, 32); /* Remove 0x40 prefix */
p = gcry_mpi_get_opaque (ecc_sk_mpi, &nbits);
len = (nbits+7)/8;
memset (ecc_sk, 0, 32);
@ -298,7 +298,7 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
ecc_ct, ecc_ct_len,
ecc_ecdh, 32,
NULL, 0);
mpi_release (ecc_ct_mpi);
log_printhex (ecc_ecdh, 32, "ecc ECDH: ");
iov[0].data = ecc_ecdh;
iov[0].off = 0;
@ -310,6 +310,7 @@ 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);
@ -325,8 +326,8 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
NULL, 0);
mpi_release (mlkem_sk_mpi);
mpi_release (mlkem_ct_mpi);
log_printhex (mlkem_ss, GCRY_KEM_MLKEM768_SHARED_LEN, "mlkemKeyShare: ");
/* Then, combine two shared secrets into one */
// multiKeyCombine(eccKeyShare, eccCipherText,
@ -347,12 +348,12 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
// counter - the 4 byte value 00 00 00 01
// customizationString - the UTF-8 encoding of the string "KDF"
//
// eccData = eccKeyShare || eccCipherText
// mlkemData = mlkemKeyShare || mlkemCipherText
// encData = counter || eccData || mlkemData || fixedInfo
// eccData = eccKeyShare || eccCipherText
// mlkemData = mlkemKeyShare || mlkemCipherText
// encData = counter || eccData || mlkemData || fixedInfo
//
// KEK = KMAC256(domSeparation, encData, oBits, customizationString)
// return KEK
// KEK = KMAC256(domSeparation, encData, oBits, customizationString)
// return KEK
//
// fixedInfo = algID (105 for ML-KEM-768-x25519kem)
//
@ -375,11 +376,12 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
iov[2].off = 0;
iov[2].len = 2;
headK[0] = 1;
headK[1] = 37;
headK[0] = 2;
headK[1] = (37*8)>>8;
headK[2] = (37*8)&0xff;
iov[3].data = headK;
iov[3].off = 0;
iov[3].len = 2;
iov[3].len = 3;
iov[4].data = "OpenPGPCompositeKeyDerivationFunction";
iov[4].off = 0;
@ -420,9 +422,11 @@ agent_hybrid_kem_decap (ctrl_t ctrl, const char *desc_text, int kemid,
iov[12].off = 0;
iov[12].len = 3;
gcry_md_hash_buffers_extract (GCRY_MD_CSHAKE256, 0, kekkey, kekkeylen,
iov, DIM (iov));
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: ");