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Correct GCM docs.

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Fix GCM documentation: the tag does not have to be supplied before
decrypting any data any more.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4231)
This commit is contained in:
Dr. Stephen Henson 2017-08-23 13:07:23 +01:00
parent a130950df9
commit 5e95c1efe6
1 changed files with 2 additions and 3 deletions
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5
doc/man3/EVP_EncryptInit.pod
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@ -442,9 +442,8 @@ either be 16 or the value previously set via EVP_CTRL_OCB_SET_TAGLEN.
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, taglen, tag);
Sets the expected tag to B<taglen> bytes from B<tag>. This call is only legal
when decrypting data and must be made B<before> any data is processed (e.g.
before any EVP_DecryptUpdate() call). For OCB mode the taglen must
either be 16 or the value previously set via EVP_CTRL_AEAD_SET_TAG.
when decrypting data. For OCB mode the taglen must either be 16 or the value
previously set via EVP_CTRL_AEAD_SET_TAG.
In OCB mode calling this with B<tag> set to NULL sets the tag length. The tag
length can only be set before specifying an IV. If not called a default tag