diff options
Diffstat (limited to 'doc/man7/provider-cipher.pod')
| -rw-r--r-- | doc/man7/provider-cipher.pod | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/doc/man7/provider-cipher.pod b/doc/man7/provider-cipher.pod index 14ff581c72c4..eaad3cf2ff02 100644 --- a/doc/man7/provider-cipher.pod +++ b/doc/man7/provider-cipher.pod @@ -148,9 +148,13 @@ It is the responsibility of the cipher implementation to handle input lengths that are not multiples of the block length. In such cases a cipher implementation will typically cache partial blocks of input data until a complete block is obtained. -I<out> may be the same location as I<in> but it should not partially overlap. -The same expectations apply to I<outsize> as documented for -L<EVP_EncryptUpdate(3)> and L<EVP_DecryptUpdate(3)>. +The pointers I<out> and I<in> may point to the same location, in which +case the encryption must be done in-place. If I<out> and I<in> point to different +locations, the requirements of L<EVP_EncryptUpdate(3)> and L<EVP_DecryptUpdate(3)> +guarantee that the two buffers are disjoint. +Similarly, the requirements of L<EVP_EncryptUpdate(3)> and L<EVP_DecryptUpdate(3)> +ensure that the buffer pointed to by I<out> contains sufficient room for the +operation being performed. OSSL_FUNC_cipher_final() completes an encryption or decryption started through previous OSSL_FUNC_cipher_encrypt_init() or OSSL_FUNC_cipher_decrypt_init(), and OSSL_FUNC_cipher_update() |