X-Git-Url: https://git.openssl.org/?a=blobdiff_plain;f=crypto%2Fasn1%2Fa_verify.c;h=be5a27e58b132645f2bf09df2c427084a7e57da0;hb=09ab755c555a96df23b78fb188578b2fba5faae2;hp=2a11927e5c1c2a68e415dbda002f711dde730c41;hpb=26a3a48d65c7464b400ec1de439994d7f0d25fed;p=openssl.git

diff --git a/crypto/asn1/a_verify.c b/crypto/asn1/a_verify.c
index 2a11927e5c..be5a27e58b 100644
--- a/crypto/asn1/a_verify.c
+++ b/crypto/asn1/a_verify.c
@@ -117,3 +117,51 @@ int ASN1_verify(int (*i2d)(), X509_ALGOR *a, ASN1_BIT_STRING *signature,
 err:
 	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;
+	const EVP_MD *type;
+	unsigned char *buf_in=NULL;
+	int ret= -1,i,inl;
+
+	i=OBJ_obj2nid(a->algorithm);
+	type=EVP_get_digestbyname(OBJ_nid2sn(i));
+	if (type == NULL)
+		{
+		ASN1err(ASN1_F_ASN1_VERIFY,ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
+		goto err;
+		}
+
+	inl = ASN1_item_i2d(asn, &buf_in, it);
+	
+	if (buf_in == NULL)
+		{
+		ASN1err(ASN1_F_ASN1_VERIFY,ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+
+	EVP_VerifyInit(&ctx,type);
+	EVP_VerifyUpdate(&ctx,(unsigned char *)buf_in,inl);
+
+	memset(buf_in,0,(unsigned int)inl);
+	OPENSSL_free(buf_in);
+
+	if (EVP_VerifyFinal(&ctx,(unsigned char *)signature->data,
+			(unsigned int)signature->length,pkey) <= 0)
+		{
+		ASN1err(ASN1_F_ASN1_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:
+	return(ret);
+	}
+
+