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RT3065: automatically generate a missing EC public key

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When d2i_ECPrivateKey reads a private key with a missing (optional) public key,
generate one automatically from the group and private key.

Reviewed-by: Dr Stephen Henson <steve@openssl.org>
This commit is contained in:
Matt Caswell 2014-08-22 18:04:19 +02:00 committed by Emilia Kasper
parent 0388ac4c99
commit f063e30fe9
2 changed files with 24 additions and 8 deletions
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21
crypto/ec/ec_asn1.c
View File

@ -1183,11 +1183,6 @@ EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
goto err;
}
if (priv_key->publicKey)
{
const unsigned char *pub_oct;
size_t pub_oct_len;
if (ret->pub_key)
EC_POINT_clear_free(ret->pub_key);
ret->pub_key = EC_POINT_new(ret->group);
@ -1196,6 +1191,12 @@ EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
if (priv_key->publicKey)
{
const unsigned char *pub_oct;
size_t pub_oct_len;
pub_oct = M_ASN1_STRING_data(priv_key->publicKey);
pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey);
/* save the point conversion form */
@ -1207,6 +1208,16 @@ EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
goto err;
}
}
else
{
if (!EC_POINT_mul(ret->group, ret->pub_key, ret->priv_key, NULL, NULL, NULL))
{
ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
goto err;
}
/* Remember the original private-key-only encoding. */
ret->enc_flag |= EC_PKEY_NO_PUBKEY;
}
ok = 1;
err:

5
doc/crypto/EC_KEY_new.pod
View File

@ -74,6 +74,11 @@ flags currently defined - EC_PKEY_NO_PARAMETERS and EC_PKEY_NO_PUBKEY. These fl
converted into ASN1 in a call to i2d_ECPrivateKey. If EC_PKEY_NO_PARAMETERS is set then the public parameters for the curve are not encoded
along with the private key. If EC_PKEY_NO_PUBKEY is set then the public key is not encoded along with the private key.
When reading a private key encoded with EC_PKEY_NO_PUBKEY,
d2i_ECPrivateKey generates the missing public key
automatically. Private keys encoded with EC_PKEY_NO_PARAMETERS cannot
be loaded using d2i_ECPrivateKey.
The functions EC_KEY_get_conv_form and EC_KEY_set_conv_form get and set the point_conversion_form for the B<key>. For a description
of point_conversion_forms please refer to L<EC_POINT_new(3)|EC_POINT_new(3)>.