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Diffstat (limited to 'doc/man3/EVP_EncryptInit.pod')
| -rw-r--r-- | doc/man3/EVP_EncryptInit.pod | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/doc/man3/EVP_EncryptInit.pod b/doc/man3/EVP_EncryptInit.pod index 6b068617b0ad..aaf9975c4c26 100644 --- a/doc/man3/EVP_EncryptInit.pod +++ b/doc/man3/EVP_EncryptInit.pod @@ -492,6 +492,15 @@ EVP_EncryptFinal_ex(), EVP_DecryptInit_ex(), EVP_DecryptFinal_ex(), EVP_CipherInit_ex() and EVP_CipherFinal_ex() because they can reuse an existing context without allocating and freeing it up on each call. +There are some differences between functions EVP_CipherInit() and +EVP_CipherInit_ex(), significant in some circumstances. EVP_CipherInit() fills +the passed context object with zeros. As a consequence, EVP_CipherInit() does +not allow step-by-step initialization of the ctx when the I<key> and I<iv> are +passed in separate calls. It also means that the flags set for the CTX are +removed, and it is especially important for the +B<EVP_CIPHER_CTX_FLAG_WRAP_ALLOW> flag treated specially in +EVP_CipherInit_ex(). + EVP_get_cipherbynid(), and EVP_get_cipherbyobj() are implemented as macros. =head1 BUGS |