Req #80495 [Opn]: Enable to set padding in openssl_verify

Edit report at https://bugs.php.net/bug.php?id=80495&edit=1 ID: 80495 User updated by: tobias dot assmann at ecsec dot de Reported by: tobias dot assmann at ecsec dot de Summary: Enable to set padding in openssl_verify Status: Open Type: Feature/Change Request Package: OpenSSL related Operating System: Linux PHP Version: Irrelevant Block user comment: N Private report: N New Comment: As I have been told, my description of the issue is not really accurate. Therefore I try to describe the problem in more detail. Currently in PHP it is only possible to make and verify OpenSSL based signatures based on cryptography defined in PKCS #1 v1.5. This is due to the mapping of the algorithm parameter given in the PHP function "openssl_sign" to a OpenSSL function (https://github.com/php/php-src/blob/3370b5fd8732ba47a6c833411d57481b9d2d4c02/ext/openssl/openssl.c#L6433) which only uses the RSA-SSA implementation as specified by PKCS #1 v1.5. It would be great, to enable creating an signature based on the cryptographic standard PKCS #1 v2 (RSASSA-PSS). I think the following changes are needed for this: * add the possibility to specify the signature algorithm and the digest algorithm separately in the "openssl_sign" and openssl_verify" PHP functions * change the underlying mapping to OpenSSL calls, to make use of the OpenSSL RSASSA-PSS implementation, if the given algorithms defines the need for it For creating RSASSA-PSS Signatures an EVP_PKEY_CTX (https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md.html) is needed. An example for the creation would be: EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA_PSS, NULL); To use this EVP_PKEY_CTX the calling of the method EVP_SignInit (https://www.openssl.org/docs/man1.1.0/man3/EVP_SignInit.html) should be replaced by using EVP_DigestSignInit funktion benutzt werden (https://www.openssl.org/docs/man1.1.0/man3/EVP_DigestSignInit.html). Hope this clarifies the intention of this bug report. Please feel free to reach out to me for any questions. Previous Comments: ------------------------------------------------------------------------ [2020-12-08 14:17:12] tobias dot assmann at ecsec dot de Description: ------------ Hi, when using the openssl extension for public en-/decryption (openssl_public_decrypt) you can set the padding with values like OPENSSL_PKCS1_PADDING. This is not possible when trying to verify a signature using openssl_verify() But setting the padding or using a greater collection of alorithems is needed, when wanting to verify a signature which has been created with a PKCS1 v2 (RSASSA-PSS) based algorithm i.E. sha256-rsa-MGF1. It would be great if the PHP openssl extensions could be enhanced to use it with more flexibility regarding cryptographic algorithms. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80495&edit=1