Skip to content

crypto: fix behavior of createCipher in wrap mode #21287

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
tniessen wants to merge 2 commits into from
Closed

crypto: fix behavior of createCipher in wrap mode #21287

Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
e85f371
crypto: fix behavior of createCipher in wrap mode
tniessen Jun 12, 2018
94b36f3
fixup! crypto: fix behavior of createCipher in wrap mode
tniessen Jun 14, 2018
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 5 additions & 4 deletions src/node_crypto.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2592,10 +2592,14 @@ void CipherBase::Init(const char* cipher_type,
iv);

ctx_.reset(EVP_CIPHER_CTX_new());

int mode = EVP_CIPHER_mode(cipher);
Copy link
Copy Markdown
Member

@bnoordhuis bnoordhuis Jun 14, 2018

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Maybe const int to make it obvious it isn't modified below.

if (mode == EVP_CIPH_WRAP_MODE)
EVP_CIPHER_CTX_set_flags(ctx_.get(), EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);

const bool encrypt = (kind_ == kCipher);
EVP_CipherInit_ex(ctx_.get(), cipher, nullptr, nullptr, nullptr, encrypt);
Copy link
Copy Markdown
Member Author

@tniessen tniessen Jun 12, 2018

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This call will fail without the flag being set.


int mode = EVP_CIPHER_CTX_mode(ctx_.get());
if (encrypt && (mode == EVP_CIPH_CTR_MODE || mode == EVP_CIPH_GCM_MODE ||
mode == EVP_CIPH_CCM_MODE)) {
// Ignore the return value (i.e. possible exception) because we are
Expand All @@ -2605,9 +2609,6 @@ void CipherBase::Init(const char* cipher_type,
cipher_type);
}

if (mode == EVP_CIPH_WRAP_MODE)
EVP_CIPHER_CTX_set_flags(ctx_.get(), EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);

if (IsAuthenticatedMode()) {
if (!InitAuthenticated(cipher_type, EVP_CIPHER_iv_length(cipher),
auth_tag_len))
Expand Down