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Update EVP_CIPHER_CTX_set_padding documentation.

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Add note about when EVP_CIPHER_CTX_set_padding should be called.

Reviewed-by: Dr. Stephen Henson <steve@openssl.org>
This commit is contained in:
Conrado Porto Lopes Gouvêa 2016-03-15 13:32:38 -03:00 committed by Rich Salz
parent f33d63c9d0
commit 83f68df32f
1 changed files with 8 additions and 6 deletions
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14
doc/crypto/EVP_EncryptInit.pod
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@ -194,12 +194,14 @@ passed an B<EVP_CIPHER> or B<EVP_CIPHER_CTX> structure. The actual NID
value is an internal value which may not have a corresponding OBJECT
IDENTIFIER.
EVP_CIPHER_CTX_set_padding() enables or disables padding. By default
encryption operations are padded using standard block padding and the
padding is checked and removed when decrypting. If the B<pad> parameter
is zero then no padding is performed, the total amount of data encrypted
or decrypted must then be a multiple of the block size or an error will
occur.
EVP_CIPHER_CTX_set_padding() enables or disables padding. This
function should be called after the context is set up for encryption
or decryption with EVP_EncryptInit_ex(), EVP_DecryptInit_ex() or
EVP_CipherInit_ex(). By default encryption operations are padded using
standard block padding and the padding is checked and removed when
decrypting. If the B<pad> parameter is zero then no padding is
performed, the total amount of data encrypted or decrypted must then
be a multiple of the block size or an error will occur.
EVP_CIPHER_key_length() and EVP_CIPHER_CTX_key_length() return the key
length of a cipher when passed an B<EVP_CIPHER> or B<EVP_CIPHER_CTX>