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Extend EVP_PKEY_copy_parameters()

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Make EVP_PKEY_copy_parameters() work if the destination has no type
(e.g. if obtained from EVP_PKEY_new()) or the underlying key is NULL.
This is useful where we want to copy the parameters from an existing
key to a new key.

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
This commit is contained in:
Dr. Stephen Henson
2015-12-13 17:28:40 +00:00
parent d911097d7c
commit 2986ecdc08
4 changed files with 20 additions and 1 deletions
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5
crypto/dh/dh_ameth.c
View File

@@ -507,6 +507,11 @@ DH *DHparams_dup(DH *dh)
static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
{
if (to->pkey.dh == NULL) {
to->pkey.dh = DH_new();
if (to->pkey.dh == NULL)
return 0;
}
return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
from->ameth == &dhx_asn1_meth);
}

6
crypto/dsa/dsa_ameth.c
View File

@@ -364,6 +364,12 @@ static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
{
BIGNUM *a;
if (to->pkey.dsa == NULL) {
to->pkey.dsa = DSA_new();
if (to->pkey.dsa == NULL)
return 0;
}
if ((a = BN_dup(from->pkey.dsa->p)) == NULL)
return 0;
BN_free(to->pkey.dsa->p);

5
crypto/ec/ec_ameth.c
View File

@@ -402,6 +402,11 @@ static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
if (group == NULL)
return 0;
if (to->pkey.ec == NULL) {
to->pkey.ec = EC_KEY_new();
if (to->pkey.ec == NULL)
return 0;
}
if (EC_KEY_set_group(to->pkey.ec, group) == 0)
return 0;
EC_GROUP_free(group);

5
crypto/evp/p_lib.c
View File

@@ -129,7 +129,10 @@ int EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)
int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
{
if (to->type != from->type) {
if (to->type == EVP_PKEY_NONE) {
if (EVP_PKEY_set_type(to, from->type) == 0)
return 0;
} else if (to->type != from->type) {
EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_KEY_TYPES);
goto err;
}