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OpenSSL 3.0: Determine the prime length for an EC key group using EVP_PKEY

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EVP_PKEY_get0_EC_KEY() and EC_KEY_get0_group() were deprecated in
OpenSSL 3.0. Add a version of this by determining the group without
fetching the EC_KEY itself from an EVP_PKEY.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2022-03-13 10:40:06 +02:00
parent 3c61f4db4c
commit b700a56e14
1 changed files with 49 additions and 14 deletions
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63
src/crypto/crypto_openssl.c
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@ -2786,24 +2786,34 @@ struct wpabuf * crypto_ec_key_sign(struct crypto_ec_key *key, const u8 *data,
}
struct wpabuf * crypto_ec_key_sign_r_s(struct crypto_ec_key *key,
const u8 *data, size_t len)
static int openssl_evp_pkey_ec_prime_len(struct crypto_ec_key *key)
{
#if OPENSSL_VERSION_NUMBER >= 0x30000000L
char gname[50];
int nid;
EC_GROUP *group;
BIGNUM *prime = NULL;
int prime_len = -1;
if (EVP_PKEY_get_group_name((EVP_PKEY *) key, gname, sizeof(gname),
NULL) != 1)
return -1;
nid = OBJ_txt2nid(gname);
group = EC_GROUP_new_by_curve_name(nid);
prime = BN_new();
if (!group || !prime)
return -1;
if (EC_GROUP_get_curve(group, prime, NULL, NULL, NULL) == 1)
prime_len = BN_num_bytes(prime);
EC_GROUP_free(group);
BN_free(prime);
return prime_len;
#else
const EC_GROUP *group;
const EC_KEY *eckey;
BIGNUM *prime = NULL;
ECDSA_SIG *sig = NULL;
const BIGNUM *r, *s;
u8 *r_buf, *s_buf;
struct wpabuf *buf;
const unsigned char *p;
int prime_len;
int prime_len = -1;
buf = crypto_ec_key_sign(key, data, len);
if (!buf)
return NULL;
/* Extract (r,s) from Ecdsa-Sig-Value */
eckey = EVP_PKEY_get0_EC_KEY((EVP_PKEY *) key);
if (!eckey)
goto fail;
@ -2813,6 +2823,32 @@ struct wpabuf * crypto_ec_key_sign_r_s(struct crypto_ec_key *key,
!EC_GROUP_get_curve(group, prime, NULL, NULL, NULL))
goto fail;
prime_len = BN_num_bytes(prime);
fail:
BN_free(prime);
return prime_len;
#endif
}
struct wpabuf * crypto_ec_key_sign_r_s(struct crypto_ec_key *key,
const u8 *data, size_t len)
{
ECDSA_SIG *sig = NULL;
const BIGNUM *r, *s;
u8 *r_buf, *s_buf;
struct wpabuf *buf;
const unsigned char *p;
int prime_len;
prime_len = openssl_evp_pkey_ec_prime_len(key);
if (prime_len < 0)
return NULL;
buf = crypto_ec_key_sign(key, data, len);
if (!buf)
return NULL;
/* Extract (r,s) from Ecdsa-Sig-Value */
p = wpabuf_head(buf);
sig = d2i_ECDSA_SIG(NULL, &p, wpabuf_len(buf));
@ -2831,7 +2867,6 @@ struct wpabuf * crypto_ec_key_sign_r_s(struct crypto_ec_key *key,
goto fail;
out:
BN_free(prime);
ECDSA_SIG_free(sig);
return buf;
fail: