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There was recently an instance where a user was confused by the deprecation warnings in the docs. They believed the warning applied to the immediately preceding function declarations, when it fact it applied to the following function declarations. https://mta.openssl.org/pipermail/openssl-users/2021-December/014665.html We clarify the wording to make it clear that the warning applies to the following functions. Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17180)
260 lines
10 KiB
Plaintext
260 lines
10 KiB
Plaintext
=pod
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=head1 NAME
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EVP_CIPHER_meth_new, EVP_CIPHER_meth_dup, EVP_CIPHER_meth_free,
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EVP_CIPHER_meth_set_iv_length, EVP_CIPHER_meth_set_flags,
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EVP_CIPHER_meth_set_impl_ctx_size, EVP_CIPHER_meth_set_init,
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EVP_CIPHER_meth_set_do_cipher, EVP_CIPHER_meth_set_cleanup,
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EVP_CIPHER_meth_set_set_asn1_params, EVP_CIPHER_meth_set_get_asn1_params,
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EVP_CIPHER_meth_set_ctrl, EVP_CIPHER_meth_get_init,
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EVP_CIPHER_meth_get_do_cipher, EVP_CIPHER_meth_get_cleanup,
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EVP_CIPHER_meth_get_set_asn1_params, EVP_CIPHER_meth_get_get_asn1_params,
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EVP_CIPHER_meth_get_ctrl
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- Routines to build up EVP_CIPHER methods
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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see L<openssl_user_macros(7)>:
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EVP_CIPHER *EVP_CIPHER_meth_new(int cipher_type, int block_size, int key_len);
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EVP_CIPHER *EVP_CIPHER_meth_dup(const EVP_CIPHER *cipher);
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void EVP_CIPHER_meth_free(EVP_CIPHER *cipher);
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int EVP_CIPHER_meth_set_iv_length(EVP_CIPHER *cipher, int iv_len);
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int EVP_CIPHER_meth_set_flags(EVP_CIPHER *cipher, unsigned long flags);
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int EVP_CIPHER_meth_set_impl_ctx_size(EVP_CIPHER *cipher, int ctx_size);
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int EVP_CIPHER_meth_set_init(EVP_CIPHER *cipher,
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int (*init)(EVP_CIPHER_CTX *ctx,
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const unsigned char *key,
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const unsigned char *iv,
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int enc));
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int EVP_CIPHER_meth_set_do_cipher(EVP_CIPHER *cipher,
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int (*do_cipher)(EVP_CIPHER_CTX *ctx,
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unsigned char *out,
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const unsigned char *in,
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size_t inl));
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int EVP_CIPHER_meth_set_cleanup(EVP_CIPHER *cipher,
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int (*cleanup)(EVP_CIPHER_CTX *));
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int EVP_CIPHER_meth_set_set_asn1_params(EVP_CIPHER *cipher,
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int (*set_asn1_parameters)(EVP_CIPHER_CTX *,
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ASN1_TYPE *));
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int EVP_CIPHER_meth_set_get_asn1_params(EVP_CIPHER *cipher,
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int (*get_asn1_parameters)(EVP_CIPHER_CTX *,
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ASN1_TYPE *));
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int EVP_CIPHER_meth_set_ctrl(EVP_CIPHER *cipher,
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int (*ctrl)(EVP_CIPHER_CTX *, int type,
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int arg, void *ptr));
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int (*EVP_CIPHER_meth_get_init(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *ctx,
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const unsigned char *key,
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const unsigned char *iv,
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int enc);
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int (*EVP_CIPHER_meth_get_do_cipher(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *ctx,
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unsigned char *out,
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const unsigned char *in,
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size_t inl);
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int (*EVP_CIPHER_meth_get_cleanup(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *);
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int (*EVP_CIPHER_meth_get_set_asn1_params(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
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ASN1_TYPE *);
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int (*EVP_CIPHER_meth_get_get_asn1_params(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
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ASN1_TYPE *);
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int (*EVP_CIPHER_meth_get_ctrl(const EVP_CIPHER *cipher))(EVP_CIPHER_CTX *,
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int type, int arg,
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void *ptr);
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=head1 DESCRIPTION
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All of the functions described on this page are deprecated.
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Applications should instead use the OSSL_PROVIDER APIs.
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The B<EVP_CIPHER> type is a structure for symmetric cipher method
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implementation.
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EVP_CIPHER_meth_new() creates a new B<EVP_CIPHER> structure.
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EVP_CIPHER_meth_dup() creates a copy of B<cipher>.
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EVP_CIPHER_meth_free() destroys a B<EVP_CIPHER> structure.
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EVP_CIPHER_meth_set_iv_length() sets the length of the IV.
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This is only needed when the implemented cipher mode requires it.
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EVP_CIPHER_meth_set_flags() sets the flags to describe optional
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behaviours in the particular B<cipher>.
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With the exception of cipher modes, of which only one may be present,
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several flags can be or'd together.
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The available flags are:
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=over 4
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=item EVP_CIPH_STREAM_CIPHER, EVP_CIPH_ECB_MODE EVP_CIPH_CBC_MODE,
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EVP_CIPH_CFB_MODE, EVP_CIPH_OFB_MODE, EVP_CIPH_CTR_MODE, EVP_CIPH_GCM_MODE,
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EVP_CIPH_CCM_MODE, EVP_CIPH_XTS_MODE, EVP_CIPH_WRAP_MODE,
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EVP_CIPH_OCB_MODE, EVP_CIPH_SIV_MODE
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The cipher mode.
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=item EVP_CIPH_VARIABLE_LENGTH
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This cipher is of variable length.
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=item EVP_CIPH_CUSTOM_IV
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Storing and initialising the IV is left entirely to the
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implementation.
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=item EVP_CIPH_ALWAYS_CALL_INIT
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Set this if the implementation's init() function should be called even
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if B<key> is B<NULL>.
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=item EVP_CIPH_CTRL_INIT
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Set this to have the implementation's ctrl() function called with
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command code B<EVP_CTRL_INIT> early in its setup.
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=item EVP_CIPH_CUSTOM_KEY_LENGTH
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Checking and setting the key length after creating the B<EVP_CIPHER>
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is left to the implementation.
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Whenever someone uses EVP_CIPHER_CTX_set_key_length() on a
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B<EVP_CIPHER> with this flag set, the implementation's ctrl() function
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will be called with the control code B<EVP_CTRL_SET_KEY_LENGTH> and
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the key length in B<arg>.
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=item EVP_CIPH_NO_PADDING
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Don't use standard block padding.
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=item EVP_CIPH_RAND_KEY
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Making a key with random content is left to the implementation.
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This is done by calling the implementation's ctrl() function with the
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control code B<EVP_CTRL_RAND_KEY> and the pointer to the key memory
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storage in B<ptr>.
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=item EVP_CIPH_CUSTOM_COPY
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Set this to have the implementation's ctrl() function called with
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command code B<EVP_CTRL_COPY> at the end of EVP_CIPHER_CTX_copy().
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The intended use is for further things to deal with after the
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implementation specific data block has been copied.
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The destination B<EVP_CIPHER_CTX> is passed to the control with the
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B<ptr> parameter.
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The implementation specific data block is reached with
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EVP_CIPHER_CTX_get_cipher_data().
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=item EVP_CIPH_FLAG_DEFAULT_ASN1
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Use the default EVP routines to pass IV to and from ASN.1.
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=item EVP_CIPH_FLAG_LENGTH_BITS
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Signals that the length of the input buffer for encryption /
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decryption is to be understood as the number of bits instead of
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bytes for this implementation.
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This is only useful for CFB1 ciphers.
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=item EVP_CIPH_FLAG_CTS
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Indicates that the cipher uses ciphertext stealing. This is currently
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used to indicate that the cipher is a one shot that only allows a single call to
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EVP_CipherUpdate().
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=item EVP_CIPH_FLAG_CUSTOM_CIPHER
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This indicates that the implementation takes care of everything,
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including padding, buffering and finalization.
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The EVP routines will simply give them control and do nothing more.
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=item EVP_CIPH_FLAG_AEAD_CIPHER
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This indicates that this is an AEAD cipher implementation.
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=item EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
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Allow interleaving of crypto blocks, a particular optimization only applicable
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to certain TLS ciphers.
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=back
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EVP_CIPHER_meth_set_impl_ctx_size() sets the size of the EVP_CIPHER's
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implementation context so that it can be automatically allocated.
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EVP_CIPHER_meth_set_init() sets the cipher init function for
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B<cipher>.
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The cipher init function is called by EVP_CipherInit(),
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EVP_CipherInit_ex(), EVP_EncryptInit(), EVP_EncryptInit_ex(),
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EVP_DecryptInit(), EVP_DecryptInit_ex().
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EVP_CIPHER_meth_set_do_cipher() sets the cipher function for
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B<cipher>.
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The cipher function is called by EVP_CipherUpdate(),
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EVP_EncryptUpdate(), EVP_DecryptUpdate(), EVP_CipherFinal(),
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EVP_EncryptFinal(), EVP_EncryptFinal_ex(), EVP_DecryptFinal() and
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EVP_DecryptFinal_ex().
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EVP_CIPHER_meth_set_cleanup() sets the function for B<cipher> to do
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extra cleanup before the method's private data structure is cleaned
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out and freed.
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Note that the cleanup function is passed a B<EVP_CIPHER_CTX *>, the
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private data structure is then available with
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EVP_CIPHER_CTX_get_cipher_data().
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This cleanup function is called by EVP_CIPHER_CTX_reset() and
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EVP_CIPHER_CTX_free().
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EVP_CIPHER_meth_set_set_asn1_params() sets the function for B<cipher>
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to set the AlgorithmIdentifier "parameter" based on the passed cipher.
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This function is called by EVP_CIPHER_param_to_asn1().
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EVP_CIPHER_meth_set_get_asn1_params() sets the function for B<cipher>
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that sets the cipher parameters based on an ASN.1 AlgorithmIdentifier
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"parameter".
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Both these functions are needed when there is a need for custom data
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(more or other than the cipher IV).
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They are called by EVP_CIPHER_param_to_asn1() and
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EVP_CIPHER_asn1_to_param() respectively if defined.
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EVP_CIPHER_meth_set_ctrl() sets the control function for B<cipher>.
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EVP_CIPHER_meth_get_init(), EVP_CIPHER_meth_get_do_cipher(),
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EVP_CIPHER_meth_get_cleanup(), EVP_CIPHER_meth_get_set_asn1_params(),
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EVP_CIPHER_meth_get_get_asn1_params() and EVP_CIPHER_meth_get_ctrl()
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are all used to retrieve the method data given with the
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EVP_CIPHER_meth_set_*() functions above.
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=head1 RETURN VALUES
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EVP_CIPHER_meth_new() and EVP_CIPHER_meth_dup() return a pointer to a
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newly created B<EVP_CIPHER>, or NULL on failure.
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All EVP_CIPHER_meth_set_*() functions return 1.
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All EVP_CIPHER_meth_get_*() functions return pointers to their
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respective B<cipher> function.
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=head1 SEE ALSO
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L<EVP_EncryptInit(3)>
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=head1 HISTORY
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All of these functions were deprecated in OpenSSL 3.0.
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The functions described here were added in OpenSSL 1.1.0.
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The B<EVP_CIPHER> structure created with these functions became reference
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counted in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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