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cofactor is optional in parameter encodings

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Submitted by: Nils Larsch
This commit is contained in:
Bodo Möller 2003-01-25 15:28:49 +00:00
parent c1862f9136
commit 82516e3baf
1 changed files with 38 additions and 26 deletions
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64
crypto/ec/ec_asn1.c
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@ -3,7 +3,7 @@
* Written by Nils Larsch for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 2000-2002 The OpenSSL Project. All rights reserved.
* Copyright (c) 2000-2003 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -224,7 +224,7 @@ ASN1_SEQUENCE(ECPARAMETERS) = {
ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
ASN1_SIMPLE(ECPARAMETERS, cofactor, ASN1_INTEGER)
ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
} ASN1_SEQUENCE_END(ECPARAMETERS)
DECLARE_ASN1_FUNCTIONS_const(ECPARAMETERS)
@ -715,17 +715,15 @@ static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
goto err;
}
/* set the cofactor */
if (!EC_GROUP_get_cofactor(group, tmp, NULL))
/* set the cofactor (optional) */
if (EC_GROUP_get_cofactor(group, tmp, NULL))
{
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
goto err;
}
ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
if (ret->cofactor == NULL)
{
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
goto err;
ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
if (ret->cofactor == NULL)
{
ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
goto err;
}
}
ok = 1;
@ -978,9 +976,7 @@ static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
ret->seed_len = params->curve->seed->length;
}
/* extract the order, cofactor and generator */
if (!params->order || !params->cofactor || !params->base ||
!params->base->data)
if (!params->order || !params->base || !params->base->data)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
goto err;
@ -988,14 +984,11 @@ static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
if ((point = EC_POINT_new(ret)) == NULL) goto err;
a = ASN1_INTEGER_to_BN(params->order, a);
b = ASN1_INTEGER_to_BN(params->cofactor, b);
if (!a || !b)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
goto err;
}
/* set the point conversion form */
EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
(params->base->data[0] & ~0x01));
/* extract the ec point */
if (!EC_POINT_oct2point(ret, point, params->base->data,
params->base->length, NULL))
{
@ -1003,10 +996,29 @@ static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
goto err;
}
/* set the point conversion form */
EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
(params->base->data[0] & ~0x01));
/* extract the order */
if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
goto err;
}
/* extract the cofactor (optional) */
if (params->cofactor == NULL)
{
if (b)
{
BN_free(b);
b = NULL;
}
}
else
if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL)
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
goto err;
}
/* set the generator, order and cofactor (if present) */
if (!EC_GROUP_set_generator(ret, point, a, b))
{
ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);