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fix OID prefix format
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Signed-off-by: Felipe Ventura <[email protected]>
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@feventura
feventura committed Mar 16, 2024
1 parent 9dd0112 commit ce7bbff
Showing 1 changed file with 35 additions and 26 deletions.
61 changes: 35 additions & 26 deletions oqsprov/oqs_sig.c
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Original file line number Diff line number Diff line change
Expand Up @@ -216,32 +216,32 @@ static int oqs_sig_verify_init(void *vpoqs_sigctx, void *voqssig,

// this list need to be in order of the last number on the OID from the
// composite
static const char *composite_OID_prefix[] = {
"060B6086480186FA6B50080101", // dilithium2_pss2048
static const unsigned char *composite_OID_prefix[] = {
"060B6086480186FA6B50080101", // mldsa44_pss2048
// id-MLDSA44-RSA2048-PSS-SHA256
"060B6086480186FA6B50080102", // dilithium2_rsa2048
"060B6086480186FA6B50080102", // mldsa44_rsa2048
// id-MLDSA44-RSA2048-PKCS15-SHA256
"060B6086480186FA6B50080103", // dilithium2_ed25519
"060B6086480186FA6B50080103", // mldsa44_ed25519
// id-MLDSA44-Ed25519-SHA512
"060B6086480186FA6B50080104", // dilithium2_p256
"060B6086480186FA6B50080104", // mldsa44_p256
// id-MLDSA44-ECDSA-P256-SHA256
"060B6086480186FA6B50080105", // dilithium2_bp256
"060B6086480186FA6B50080105", // mldsa44_bp256
// id-MLDSA44-ECDSA-brainpoolP256r1-SHA256
"060B6086480186FA6B50080106", // dilithium3_pss3072
"060B6086480186FA6B50080106", // mldsa65_pss3072
// id-MLDSA65-RSA3072-PSS-SHA512
"060B6086480186FA6B50080107", // dilithium3_rsa3072
"060B6086480186FA6B50080107", // mldsa65_rsa3072
// id-MLDSA65-RSA3072-PKCS15-SHA512
"060B6086480186FA6B50080108", // dilithium3_p256
"060B6086480186FA6B50080108", // mldsa65_p256
// id-MLDSA65-ECDSA-P256-SHA512
"060B6086480186FA6B50080109", // dilithium3_bp256
"060B6086480186FA6B50080109", // mldsa65_bp256
// id-MLDSA65-ECDSA-brainpoolP256r1-SHA512
"060B6086480186FA6B5008010A", // dilithium3_ed25519
"060B6086480186FA6B5008010A", // mldsa65_ed25519
// id-MLDSA65-Ed25519-SHA512
"060B6086480186FA6B5008010B", // dilithium5_p384
"060B6086480186FA6B5008010B", // mldsa87_p384
// id-MLDSA87-ECDSA-P384-SHA512
"060B6086480186FA6B5008010C", // dilithium5_bp384
"060B6086480186FA6B5008010C", // mldsa87_bp384
// id-MLDSA87-ECDSA-brainpoolP384r1-SHA512
"060B6086480186FA6B5008010D", // dilithium5_ed448 id-MLDSA87-Ed448-SHA512
"060B6086480186FA6B5008010D", // mldsa87_ed448 id-MLDSA87-Ed448-SHA512
"060B6086480186FA6B5008010E", // falcon512_p256
// id-Falon512-ECDSA-P256-SHA256
"060B6086480186FA6B5008010F", // falcon512_bp256
Expand All @@ -251,6 +251,17 @@ static const char *composite_OID_prefix[] = {

};

void Composite_prefix_conversion(char *out, const unsigned char *in)
{
int temp;
for (int i = 0; i < COMPOSITE_OID_PREFIRX_LEN / 2; i++) {
temp = OPENSSL_hexchar2int(in[2 * i]);
temp = temp * 16;
temp += OPENSSL_hexchar2int(in[2 * i + 1]);
out[i] = (unsigned char)temp;
}
}

/* On entry to this function, data to be signed (tbs) might have been hashed
* already: this would be the case if poqs_sigctx->mdctx != NULL; if that is
* NULL, we have to hash in case of hybrid signatures
Expand Down Expand Up @@ -381,10 +392,10 @@ static int oqs_sig_sign(void *vpoqs_sigctx, unsigned char *sig, size_t *siglen,
CompositeSignature *compsig = CompositeSignature_new();
int i;
int nid = OBJ_sn2nid(oqsxkey->tls_name);
const char *oid_prefix
const unsigned char *oid_prefix
= composite_OID_prefix[get_composite_idx(get_oqsalg_idx(nid)) - 1];
char *final_tbs;
size_t final_tbslen = COMPOSITE_OID_PREFIRX_LEN;
size_t final_tbslen = COMPOSITE_OID_PREFIRX_LEN / 2;
int aux = 0;
unsigned char *tbs_hash;

Expand Down Expand Up @@ -424,11 +435,10 @@ static int oqs_sig_sign(void *vpoqs_sigctx, unsigned char *sig, size_t *siglen,
ERR_raise(ERR_LIB_USER, ERR_R_FATAL);
goto endsign;
}
final_tbslen -= 1;
final_tbs = OPENSSL_malloc(final_tbslen);
memcpy(final_tbs, oid_prefix, COMPOSITE_OID_PREFIRX_LEN);
memcpy(final_tbs + COMPOSITE_OID_PREFIRX_LEN, tbs_hash,
final_tbslen - COMPOSITE_OID_PREFIRX_LEN);
Composite_prefix_conversion(final_tbs, oid_prefix);
memcpy(final_tbs + COMPOSITE_OID_PREFIRX_LEN / 2, tbs_hash,
final_tbslen - COMPOSITE_OID_PREFIRX_LEN / 2);
OPENSSL_free(tbs_hash);

// sign
Expand Down Expand Up @@ -712,10 +722,10 @@ static int oqs_sig_verify(void *vpoqs_sigctx, const unsigned char *sig,
int nid = OBJ_sn2nid(oqsxkey->tls_name);
unsigned char *buf;
size_t buf_len;
const char *oid_prefix
const unsigned char *oid_prefix
= composite_OID_prefix[get_composite_idx(get_oqsalg_idx(nid)) - 1];
char *final_tbs;
size_t final_tbslen = COMPOSITE_OID_PREFIRX_LEN;
size_t final_tbslen = COMPOSITE_OID_PREFIRX_LEN / 2;
int aux = 0;
unsigned char *tbs_hash;

Expand Down Expand Up @@ -763,11 +773,10 @@ static int oqs_sig_verify(void *vpoqs_sigctx, const unsigned char *sig,
CompositeSignature_free(compsig);
goto endverify;
}
final_tbslen -= 1;
final_tbs = OPENSSL_malloc(final_tbslen);
memcpy(final_tbs, oid_prefix, COMPOSITE_OID_PREFIRX_LEN);
memcpy(final_tbs + COMPOSITE_OID_PREFIRX_LEN, tbs_hash,
final_tbslen - COMPOSITE_OID_PREFIRX_LEN);
Composite_prefix_conversion(final_tbs, oid_prefix);
memcpy(final_tbs + COMPOSITE_OID_PREFIRX_LEN / 2, tbs_hash,
final_tbslen - COMPOSITE_OID_PREFIRX_LEN / 2);
OPENSSL_free(tbs_hash);

// verify
Expand Down

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