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agent:kem: Support other ML-KEM variants.

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* agent/pkdecrypt.c (composite_pgp_kem_decrypt): Care about
ML-KEM 512 and 1024.

--

Co-authored-by: Werner Koch <wk@gnupg.org>
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2024-04-23 14:40:27 +09:00
parent d5c6b52e59
commit 65833eefb2
No known key found for this signature in database
GPG Key ID: 640114AF89DE6054
1 changed files with 40 additions and 11 deletions
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51
agent/pkdecrypt.c
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@ -273,11 +273,15 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
unsigned char ecc_ecdh[ECC_POINT_LEN_MAX];
unsigned char ecc_ss[ECC_HASH_LEN_MAX];
enum gcry_kem_algos mlkem_kem_algo;
gcry_mpi_t mlkem_sk_mpi = NULL;
gcry_mpi_t mlkem_ct_mpi = NULL;
const unsigned char *mlkem_sk;
size_t mlkem_sk_len;
const unsigned char *mlkem_ct;
unsigned char mlkem_ss[GCRY_KEM_MLKEM768_SHARED_LEN];
size_t mlkem_ct_len;
unsigned char mlkem_ss[GCRY_KEM_MLKEM1024_SHARED_LEN];
size_t mlkem_ss_len;
unsigned char kek[32];
size_t kek_len = 32; /* AES-256 is mandatory */
@ -453,27 +457,45 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
goto leave;
}
mlkem_sk = gcry_mpi_get_opaque (mlkem_sk_mpi, &nbits);
len = (nbits+7)/8;
if (len != GCRY_KEM_MLKEM768_SECKEY_LEN)
mlkem_sk_len = (nbits+7)/8;
if (mlkem_sk_len == GCRY_KEM_MLKEM512_SECKEY_LEN)
{
mlkem_kem_algo = GCRY_KEM_MLKEM512;
mlkem_ss_len = GCRY_KEM_MLKEM512_SHARED_LEN;
mlkem_ct_len = GCRY_KEM_MLKEM512_CIPHER_LEN;
}
else if (mlkem_sk_len == GCRY_KEM_MLKEM768_SECKEY_LEN)
{
mlkem_kem_algo = GCRY_KEM_MLKEM768;
mlkem_ss_len = GCRY_KEM_MLKEM768_SHARED_LEN;
mlkem_ct_len = GCRY_KEM_MLKEM768_CIPHER_LEN;
}
else if (mlkem_sk_len == GCRY_KEM_MLKEM1024_SECKEY_LEN)
{
mlkem_kem_algo = GCRY_KEM_MLKEM1024;
mlkem_ss_len = GCRY_KEM_MLKEM1024_SHARED_LEN;
mlkem_ct_len = GCRY_KEM_MLKEM1024_CIPHER_LEN;
}
else
{
if (opt.verbose)
log_info ("%s: PQ key length invalid (%zu)\n", __func__, len);
log_info ("%s: PQ key length invalid (%zu)\n", __func__, mlkem_sk_len);
err = gpg_error (GPG_ERR_INV_DATA);
goto leave;
}
mlkem_ct = gcry_mpi_get_opaque (mlkem_ct_mpi, &nbits);
len = (nbits+7)/8;
if (len != GCRY_KEM_MLKEM768_CIPHER_LEN)
if (len != mlkem_ct_len)
{
if (opt.verbose)
log_info ("%s: PQ cipher text length invalid (%zu)\n", __func__, len);
log_info ("%s: PQ cipher text length invalid (%zu)\n",
__func__, mlkem_ct_len);
err = gpg_error (GPG_ERR_INV_DATA);
goto leave;
}
err = gcry_kem_decap (GCRY_KEM_MLKEM768,
mlkem_sk, GCRY_KEM_MLKEM768_SECKEY_LEN,
mlkem_ct, GCRY_KEM_MLKEM768_CIPHER_LEN,
mlkem_ss, GCRY_KEM_MLKEM768_SHARED_LEN,
err = gcry_kem_decap (mlkem_kem_algo, mlkem_sk, mlkem_sk_len,
mlkem_ct, mlkem_ct_len, mlkem_ss, mlkem_ss_len,
NULL, 0);
if (err)
{
@ -499,8 +521,8 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
}
mpi_release (ecc_ct_mpi);
mpi_release (mlkem_ct_mpi);
ecc_ct_mpi = NULL;
mpi_release (mlkem_ct_mpi);
mlkem_ct_mpi = NULL;
if (DBG_CRYPTO)
@ -540,6 +562,13 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
put_membuf (outbuf, ")", 2);
leave:
wipememory (ecc_sk, sizeof ecc_sk);
wipememory (ecc_ecdh, sizeof ecc_ecdh);
wipememory (ecc_ss, sizeof ecc_ss);
wipememory (mlkem_ss, sizeof mlkem_ss);
wipememory (kek, sizeof kek);
wipememory (sessionkey, sizeof sessionkey);
mpi_release (mlkem_sk_mpi);
mpi_release (ecc_pk_mpi);
mpi_release (ecc_sk_mpi);