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SM4: Document that the XTS mode does not support streaming 

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tom Cosgrove <tom.cosgrove@arm.com>
(Merged from https://github.com/openssl/openssl/pull/23028)
This commit is contained in:
Tomas Mraz 2023-12-13 10:03:07 +01:00
parent 2462e431ff
commit e2f9c2dd37
1 changed files with 9 additions and 0 deletions
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doc/man7/EVP_CIPHER-SM4.pod
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@ -37,6 +37,15 @@ The following algorithms are available in the default provider:
This implementation supports the parameters described in
L<EVP_EncryptInit(3)/PARAMETERS>.
=head1 NOTES
The SM4-XTS implementation allows streaming to be performed, but each
L<EVP_EncryptUpdate(3)> or L<EVP_DecryptUpdate(3)> call requires each input
to be a multiple of the blocksize. Only the final EVP_EncryptUpdate() or
EVP_DecryptUpdate() call can optionally have an input that is not a multiple
of the blocksize but is larger than one block. In that case ciphertext
stealing (CTS) is used to fill the block.
=head1 SEE ALSO
L<provider-cipher(7)>, L<OSSL_PROVIDER-default(7)>