-
-int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signature,
- void *asn, EVP_PKEY *pkey)
- {
- EVP_MD_CTX ctx;
- const EVP_MD *type = NULL;
- unsigned char *buf_in=NULL;
- int ret= -1,inl;
-
- int mdnid, pknid;
-
- EVP_MD_CTX_init(&ctx);
-
- /* Convert signature OID into digest and public key OIDs */
- if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid))
- {
- ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
- goto err;
- }
- type=EVP_get_digestbynid(mdnid);
- if (type == NULL)
- {
- ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
- goto err;
- }
-
- /* Check public key OID matches public key type */
- if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id)
- {
- ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ASN1_R_WRONG_PUBLIC_KEY_TYPE);
- goto err;
- }
-
- if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey))
- {
- ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
- ret=0;
- goto err;
- }
-
- inl = ASN1_item_i2d(asn, &buf_in, it);
-
- if (buf_in == NULL)
- {
- ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_MALLOC_FAILURE);
- goto err;
- }
-
- if (!EVP_DigestVerifyUpdate(&ctx,buf_in,inl))
- {
- ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
- ret=0;
- goto err;
- }
-
- OPENSSL_cleanse(buf_in,(unsigned int)inl);
- OPENSSL_free(buf_in);
-
- if (EVP_DigestVerifyFinal(&ctx,signature->data,
- (size_t)signature->length) <= 0)
- {
- ASN1err(ASN1_F_ASN1_ITEM_VERIFY,ERR_R_EVP_LIB);
- ret=0;
- goto err;
- }
- /* we don't need to zero the 'ctx' because we just checked
- * public information */
- /* memset(&ctx,0,sizeof(ctx)); */
- ret=1;
-err:
- EVP_MD_CTX_cleanup(&ctx);
- return(ret);
- }
-
-
+int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
+ ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
+{
+ EVP_MD_CTX *ctx = NULL;
+ unsigned char *buf_in = NULL;
+ int ret = -1, inl;
+
+ int mdnid, pknid;
+
+ if (!pkey) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_PASSED_NULL_PARAMETER);
+ return -1;
+ }
+
+ if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
+ return -1;
+ }
+
+ ctx = EVP_MD_CTX_new();
+ if (ctx == NULL) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ /* Convert signature OID into digest and public key OIDs */
+ if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
+ goto err;
+ }
+ if (mdnid == NID_undef) {
+ if (!pkey->ameth || !pkey->ameth->item_verify) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
+ ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
+ goto err;
+ }
+ ret = pkey->ameth->item_verify(ctx, it, asn, a, signature, pkey);
+ /*
+ * Return value of 2 means carry on, anything else means we exit
+ * straight away: either a fatal error of the underlying verification
+ * routine handles all verification.
+ */
+ if (ret != 2)
+ goto err;
+ ret = -1;
+ } else {
+ const EVP_MD *type;
+ type = EVP_get_digestbynid(mdnid);
+ if (type == NULL) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY,
+ ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
+ goto err;
+ }
+
+ /* Check public key OID matches public key type */
+ if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
+ goto err;
+ }
+
+ if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
+ ret = 0;
+ goto err;
+ }
+
+ }
+
+ inl = ASN1_item_i2d(asn, &buf_in, it);
+
+ if (buf_in == NULL) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_MALLOC_FAILURE);
+ goto err;
+ }
+
+ ret = EVP_DigestVerifyUpdate(ctx, buf_in, inl);
+
+ OPENSSL_clear_free(buf_in, (unsigned int)inl);
+
+ if (!ret) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
+ goto err;
+ }
+ ret = -1;
+
+ if (EVP_DigestVerifyFinal(ctx, signature->data,
+ (size_t)signature->length) <= 0) {
+ ASN1err(ASN1_F_ASN1_ITEM_VERIFY, ERR_R_EVP_LIB);
+ ret = 0;
+ goto err;
+ }
+ ret = 1;
+ err:
+ EVP_MD_CTX_free(ctx);
+ return (ret);
+}