mirror of
https://github.com/openssl/openssl.git
synced 2024-12-03 05:41:46 +08:00
254 lines
8.6 KiB
Plaintext
254 lines
8.6 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
EVP_CIPHER_meth_new, EVP_CIPHER_meth_dup, EVP_CIPHER_meth_free,
|
|
EVP_CIPHER_meth_set_iv_length, EVP_CIPHER_meth_set_flags,
|
|
EVP_CIPHER_meth_set_impl_ctx_size, EVP_CIPHER_meth_set_init,
|
|
EVP_CIPHER_meth_set_do_cipher, EVP_CIPHER_meth_set_cleanup,
|
|
EVP_CIPHER_meth_set_set_asn1_params, EVP_CIPHER_meth_set_get_asn1_params,
|
|
EVP_CIPHER_meth_set_ctrl, EVP_CIPHER_meth_get_init,
|
|
EVP_CIPHER_meth_get_do_cipher, EVP_CIPHER_meth_get_cleanup,
|
|
EVP_CIPHER_meth_get_set_asn1_params, EVP_CIPHER_meth_get_get_asn1_params,
|
|
EVP_CIPHER_meth_get_ctrl - Routines to build up EVP_CIPHER methods
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
EVP_CIPHER *EVP_CIPHER_meth_new(int cipher_type, int block_size, int key_len);
|
|
EVP_CIPHER *EVP_CIPHER_meth_dup(const EVP_CIPHER *cipher);
|
|
void EVP_CIPHER_meth_free(EVP_CIPHER *cipher);
|
|
|
|
int EVP_CIPHER_meth_set_iv_length(EVP_CIPHER *cipher, int iv_len);
|
|
int EVP_CIPHER_meth_set_flags(EVP_CIPHER *cipher, unsigned long flags);
|
|
int EVP_CIPHER_meth_set_impl_ctx_size(EVP_CIPHER *cipher, int ctx_size);
|
|
int EVP_CIPHER_meth_set_init(EVP_CIPHER *cipher,
|
|
int (*init) (EVP_CIPHER_CTX *ctx,
|
|
const unsigned char *key,
|
|
const unsigned char *iv,
|
|
int enc));
|
|
int EVP_CIPHER_meth_set_do_cipher(EVP_CIPHER *cipher,
|
|
int (*do_cipher) (EVP_CIPHER_CTX *ctx,
|
|
unsigned char *out,
|
|
const unsigned char *in,
|
|
size_t inl));
|
|
int EVP_CIPHER_meth_set_cleanup(EVP_CIPHER *cipher,
|
|
int (*cleanup) (EVP_CIPHER_CTX *));
|
|
int EVP_CIPHER_meth_set_set_asn1_params(EVP_CIPHER *cipher,
|
|
int (*set_asn1_parameters) (EVP_CIPHER_CTX *,
|
|
ASN1_TYPE *));
|
|
int EVP_CIPHER_meth_set_get_asn1_params(EVP_CIPHER *cipher,
|
|
int (*get_asn1_parameters) (EVP_CIPHER_CTX *,
|
|
ASN1_TYPE *));
|
|
int EVP_CIPHER_meth_set_ctrl(EVP_CIPHER *cipher,
|
|
int (*ctrl) (EVP_CIPHER_CTX *, int type,
|
|
int arg, void *ptr));
|
|
|
|
int (*EVP_CIPHER_meth_get_init(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *ctx,
|
|
const unsigned char *key,
|
|
const unsigned char *iv,
|
|
int enc);
|
|
int (*EVP_CIPHER_meth_get_do_cipher(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *ctx,
|
|
unsigned char *out,
|
|
const unsigned char *in,
|
|
size_t inl);
|
|
int (*EVP_CIPHER_meth_get_cleanup(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *);
|
|
int (*EVP_CIPHER_meth_get_set_asn1_params(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
|
|
ASN1_TYPE *);
|
|
int (*EVP_CIPHER_meth_get_get_asn1_params(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
|
|
ASN1_TYPE *);
|
|
int (*EVP_CIPHER_meth_get_ctrl(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
|
|
int type, int arg,
|
|
void *ptr);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The B<EVP_CIPHER> type is a structure for symmetric cipher method
|
|
implementation.
|
|
|
|
EVP_CIPHER_meth_new() creates a new B<EVP_CIPHER> structure.
|
|
|
|
EVP_CIPHER_meth_dup() creates a copy of B<cipher>.
|
|
|
|
EVP_CIPHER_meth_free() destroys a B<EVP_CIPHER> structure.
|
|
|
|
EVP_CIPHER_meth_iv_length() sets the length of the IV.
|
|
This is only needed when the implemented cipher mode requires it.
|
|
|
|
EVP_CIPHER_meth_set_flags() sets the flags to describe optional
|
|
behaviours in the particular B<cipher>.
|
|
With the exception of cipher modes, of which only one may be present,
|
|
several flags can be or'd together.
|
|
The available flags are:
|
|
|
|
=over 4
|
|
|
|
=over 4
|
|
|
|
=item The cipher modes:
|
|
|
|
=over 4
|
|
|
|
=item EVP_CIPH_STREAM_CIPHER
|
|
|
|
=item EVP_CIPH_ECB_MODE
|
|
|
|
=item EVP_CIPH_CBC_MODE
|
|
|
|
=item EVP_CIPH_CFB_MODE
|
|
|
|
=item EVP_CIPH_OFB_MODE
|
|
|
|
=item EVP_CIPH_CTR_MODE
|
|
|
|
=item EVP_CIPH_GCM_MODE
|
|
|
|
=item EVP_CIPH_CCM_MODE
|
|
|
|
=item EVP_CIPH_XTS_MODE
|
|
|
|
=item EVP_CIPH_WRAP_MODE
|
|
|
|
=item EVP_CIPH_OCB_MODE
|
|
|
|
=back
|
|
|
|
=item EVP_CIPH_VARIABLE_LENGTH
|
|
|
|
This cipher is of variable length.
|
|
|
|
=item EVP_CIPH_CUSTOM_IV
|
|
|
|
Storing and initialising the IV is left entirely to the
|
|
implementation.
|
|
|
|
=item EVP_CIPH_ALWAYS_CALL_INIT
|
|
|
|
Set this if the implementation's init() function should be called even
|
|
if B<key> is B<NULL>.
|
|
|
|
=item EVP_CIPH_CTRL_INIT
|
|
|
|
Set this to have the implementation's ctrl() function called with
|
|
command code B<EVP_CTRL_INIT> early in its setup.
|
|
|
|
=item EVP_CIPH_CUSTOM_KEY_LENGTH
|
|
|
|
Checking and setting the key length after creating the B<EVP_CIPHER>
|
|
is left to the implementation.
|
|
Whenever someone uses EVP_CIPHER_CTX_set_key_length() on a
|
|
B<EVP_CIPHER> with this flag set, the implementation's ctrl() function
|
|
will be called with the control code B<EVP_CTRL_SET_KEY_LENGTH> and
|
|
the key length in B<arg>.
|
|
|
|
=item EVP_CIPH_NO_PADDING
|
|
|
|
Don't use standard block padding.
|
|
|
|
=item EVP_CIPH_RAND_KEY
|
|
|
|
Making a key with random content is left to the implementation.
|
|
This is done by calling the implementation's ctrl() function with the
|
|
control code B<EVP_CTRL_RAND_KEY> and the pointer to the key memory
|
|
storage in B<ptr>.
|
|
|
|
=item EVP_CIPH_CUSTOM_COPY
|
|
|
|
Set this to have the implementation's ctrl() function called with
|
|
command code B<EVP_CTRL_COPY> at the end of EVP_CIPHER_CTX_copy().
|
|
The intended use is for further things to deal with after the
|
|
implementation specific data block has been copied.
|
|
The destination B<EVP_CIPHER_CTX> is passed to the control with the
|
|
B<ptr> parameter.
|
|
The implementation specific data block is reached with
|
|
EVP_CIPHER_CTX_cipher_data().
|
|
|
|
=item EVP_CIPH_FLAG_DEFAULT_ASN1
|
|
|
|
Use the default EVP routines to pass IV to and from ASN.1.
|
|
|
|
=item EVP_CIPH_FLAG_LENGTH_BITS
|
|
|
|
Signals that the length of the input buffer for encryption /
|
|
decryption is to be understood as the number of bits bits instead of
|
|
bytes for this implementation.
|
|
This is only useful for CFB1 ciphers.
|
|
|
|
=begin comment
|
|
The FIPS flags seem to be unused, so I'm hiding them until I get an
|
|
explanation or they get removed. /RL
|
|
|
|
=item EVP_CIPH_FLAG_FIPS
|
|
|
|
=item EVP_CIPH_FLAG_NON_FIPS_ALLOW
|
|
|
|
=end comment
|
|
|
|
=item EVP_CIPH_FLAG_CUSTOM_CIPHER
|
|
|
|
This indicates that the implementation takes care of everything,
|
|
including padding, buffering and finalization.
|
|
The EVP routines will simply give them control and do nothing more.
|
|
|
|
=item EVP_CIPH_FLAG_AEAD_CIPHER
|
|
|
|
This indicates that this is a AEAD cipher implementation.
|
|
|
|
=item EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
|
|
|
|
=begin comment
|
|
|
|
I could use some help explaining this one!
|
|
|
|
=end comment
|
|
|
|
=back
|
|
|
|
=back
|
|
|
|
EVP_CIPHER_meth_set_init() sets the cipher init function for
|
|
B<cipher>.
|
|
The cipher init function is called by EVP_CipherInit(),
|
|
EVP_CipherInit_ex(), EVP_EncryptInit(), EVP_EncryptInit_ex(),
|
|
EVP_DecryptInit(), EVP_DecryptInit_ex().
|
|
|
|
EVP_CIPHER_meth_set_do_cipher() sets the cipher function for
|
|
B<cipher>.
|
|
The cipher function is called by EVP_CipherUpdate(),
|
|
EVP_EncryptUpdate(), EVP_DecryptUpdate(), EVP_CipherFinal(),
|
|
EVP_EncryptFinal(), EVP_EncryptFinal_ex(), EVP_DecryptFinal() and
|
|
EVP_DecryptFinal_ex().
|
|
|
|
EVP_CIPHER_meth_set_cleanup() sets the function for B<cipher> to do
|
|
extra cleanup before the method's privata data structure is cleaned
|
|
out and freed.
|
|
Note that the cleanup function is passed a B<EVP_CIPHER_CTX *>, the
|
|
private data structure is then available with
|
|
EVP_CIPHER_CTX_cipher_data().
|
|
This cleanup function is called by EVP_CIPHER_CTX_reset() and
|
|
EVP_CIPHER_CTX_free().
|
|
|
|
EVP_CIPHER_meth_set_ctrl() sets the control function for B<cipher>.
|
|
|
|
|
|
EVP_CIPHER_meth_get_input_blocksize(), EVP_CIPHER_meth_get_result_size(),
|
|
EVP_CIPHER_meth_get_app_datasize(), EVP_CIPHER_meth_get_flags(),
|
|
EVP_CIPHER_meth_get_init(), EVP_CIPHER_meth_get_update(),
|
|
EVP_CIPHER_meth_get_final(), EVP_CIPHER_meth_get_copy(),
|
|
EVP_CIPHER_meth_get_cleanup() and EVP_CIPHER_meth_get_ctrl() are all used
|
|
to retrieve the method data given with the EVP_CIPHER_meth_set_*()
|
|
functions above.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<EVP_EncryptInit>
|
|
|
|
=head1 HISTORY
|
|
|
|
The B<EVP_CIPHER> structure was openly available in OpenSSL before version
|
|
1.1.
|
|
The functions described here were added in OpenSSL version 1.1.
|
|
|
|
=cut
|