Data Channel Cryptography OpenSSL-specific backend interface. More...

#include "syshead.h"
#include "basic.h"
#include "buffer.h"
#include "integer.h"
#include "crypto.h"
#include "crypto_backend.h"
#include "openssl_compat.h"
#include <openssl/conf.h>
#include <openssl/des.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/rand.h>
#include <openssl/ssl.h>
#include <openssl/kdf.h>

Include dependency graph for crypto_openssl.c:

Go to the source code of this file.

Data Structures
struct	collect_ciphers

Functions
void	crypto_init_lib_engine (const char *engine_name)

provider_t *	crypto_load_provider (const char *provider)
	Load the given (OpenSSL) providers.

void	crypto_unload_provider (const char provname, provider_t provider)
	Unloads the given (OpenSSL) provider.

void	crypto_init_lib (void)

void	crypto_uninit_lib (void)

void	crypto_clear_error (void)

void	crypto_print_openssl_errors (const unsigned int flags)
	Retrieve any occurred OpenSSL errors and print those errors.

static int	cipher_name_cmp (const void a, const void b)

static void	collect_ciphers (EVP_CIPHER cipher, void list)

void	show_available_ciphers (void)

void	print_digest (EVP_MD digest, void unused)

void	show_available_digests (void)

void	show_available_engines (void)

bool	crypto_pem_encode (const char name, struct buffer dst, const struct buffer src, struct gc_arena gc)
	Encode binary data as PEM.

bool	crypto_pem_decode (const char name, struct buffer dst, const struct buffer *src)
	Decode a PEM buffer to binary data.

int	rand_bytes (uint8_t *output, int len)
	Wrapper for secure random number generator.

static evp_cipher_type *	cipher_get (const char *ciphername)

bool	cipher_valid_reason (const char ciphername, const char *reason)
	Returns if the cipher is valid, based on the given cipher name and provides a reason if invalid.

const char *	cipher_kt_name (const char *ciphername)
	Retrieve a normalised string describing the cipher (e.g.

int	cipher_kt_key_size (const char *ciphername)
	Returns the size of keys used by the cipher, in bytes.

int	cipher_kt_iv_size (const char *ciphername)
	Returns the size of the IV used by the cipher, in bytes, or 0 if no IV is used.

int	cipher_kt_block_size (const char *ciphername)
	Returns the block size of the cipher, in bytes.

int	cipher_kt_tag_size (const char *ciphername)
	Returns the MAC tag size of the cipher, in bytes.

bool	cipher_kt_insecure (const char *ciphername)
	Returns true if we consider this cipher to be insecure.

int	cipher_kt_mode (const EVP_CIPHER *cipher_kt)

bool	cipher_kt_mode_cbc (const char *ciphername)
	Check if the supplied cipher is a supported CBC mode cipher.

bool	cipher_kt_mode_ofb_cfb (const char *ciphername)
	Check if the supplied cipher is a supported OFB or CFB mode cipher.

bool	cipher_kt_mode_aead (const char *ciphername)
	Check if the supplied cipher is a supported AEAD mode cipher.

cipher_ctx_t *	cipher_ctx_new (void)
	Generic cipher functions.

void	cipher_ctx_free (EVP_CIPHER_CTX *ctx)

void	cipher_ctx_init (EVP_CIPHER_CTX ctx, const uint8_t key, const char *ciphername, crypto_operation_t enc)

int	cipher_ctx_iv_length (const EVP_CIPHER_CTX *ctx)

int	cipher_ctx_get_tag (EVP_CIPHER_CTX ctx, uint8_t tag_buf, int tag_size)

int	cipher_ctx_block_size (const EVP_CIPHER_CTX *ctx)

int	cipher_ctx_mode (const EVP_CIPHER_CTX *ctx)

bool	cipher_ctx_mode_cbc (const cipher_ctx_t *ctx)
	Check if the supplied cipher is a supported CBC mode cipher.

bool	cipher_ctx_mode_ofb_cfb (const cipher_ctx_t *ctx)
	Check if the supplied cipher is a supported OFB or CFB mode cipher.

bool	cipher_ctx_mode_aead (const cipher_ctx_t *ctx)
	Check if the supplied cipher is a supported AEAD mode cipher.

int	cipher_ctx_reset (EVP_CIPHER_CTX ctx, const uint8_t iv_buf)

int	cipher_ctx_update_ad (EVP_CIPHER_CTX ctx, const uint8_t src, int src_len)

int	cipher_ctx_update (EVP_CIPHER_CTX ctx, uint8_t dst, int dst_len, uint8_t src, int src_len)

int	cipher_ctx_final (EVP_CIPHER_CTX ctx, uint8_t dst, int *dst_len)

int	cipher_ctx_final_check_tag (EVP_CIPHER_CTX ctx, uint8_t dst, int dst_len, uint8_t tag, size_t tag_len)

static evp_md_type *	md_get (const char *digest)

bool	md_valid (const char *digest)
	Return if a message digest parameters is valid given the name of the digest.

const char *	md_kt_name (const char *mdname)
	Retrieve a string describing the digest digest (e.g.

unsigned char	md_kt_size (const char *mdname)
	Returns the size of the message digest, in bytes.

int	md_full (const char mdname, const uint8_t src, int src_len, uint8_t *dst)
	Calculates the message digest for the given buffer.

EVP_MD_CTX *	md_ctx_new (void)

void	md_ctx_free (EVP_MD_CTX *ctx)

void	md_ctx_init (EVP_MD_CTX ctx, const char mdname)

void	md_ctx_cleanup (EVP_MD_CTX *ctx)

int	md_ctx_size (const EVP_MD_CTX *ctx)

void	md_ctx_update (EVP_MD_CTX ctx, const uint8_t src, int src_len)

void	md_ctx_final (EVP_MD_CTX ctx, uint8_t dst)

HMAC_CTX *	hmac_ctx_new (void)

void	hmac_ctx_free (HMAC_CTX *ctx)

void	hmac_ctx_init (HMAC_CTX ctx, const uint8_t key, const char *mdname)

void	hmac_ctx_cleanup (HMAC_CTX *ctx)

int	hmac_ctx_size (HMAC_CTX *ctx)

void	hmac_ctx_reset (HMAC_CTX *ctx)

void	hmac_ctx_update (HMAC_CTX ctx, const uint8_t src, int src_len)

void	hmac_ctx_final (HMAC_CTX ctx, uint8_t dst)

int	memcmp_constant_time (const void a, const void b, size_t size)
	As memcmp(), but constant-time.

bool	ssl_tls1_PRF (const uint8_t seed, size_t seed_len, const uint8_t secret, size_t secret_len, uint8_t *output, size_t output_len)
	Calculates the TLS 1.0-1.1 PRF function.

Variables
const cipher_name_pair	cipher_name_translation_table []
	Cipher name translation table.

const size_t	cipher_name_translation_table_count

const cipher_name_pair	digest_name_translation_table []

const size_t	digest_name_translation_table_count

Detailed Description

Data Channel Cryptography OpenSSL-specific backend interface.

Definition in file crypto_openssl.c.

Function Documentation

◆ cipher_ctx_block_size()

int cipher_ctx_block_size ( const EVP_CIPHER_CTX * ctx )

Definition at line 888 of file crypto_openssl.c.

◆ cipher_ctx_final()

int cipher_ctx_final	(	EVP_CIPHER_CTX *	ctx,
		uint8_t *	dst,
		int *	dst_len
	)

Definition at line 989 of file crypto_openssl.c.

Referenced by cipher_ctx_final_check_tag().

◆ cipher_ctx_final_check_tag()

int cipher_ctx_final_check_tag	(	EVP_CIPHER_CTX *	ctx,
		uint8_t *	dst,
		int *	dst_len,
		uint8_t *	tag,
		size_t	tag_len
	)

Definition at line 995 of file crypto_openssl.c.

References ASSERT, and cipher_ctx_final().

◆ cipher_ctx_free()

void cipher_ctx_free ( EVP_CIPHER_CTX * ctx )

Definition at line 852 of file crypto_openssl.c.

◆ cipher_ctx_get_tag()

int cipher_ctx_get_tag	(	EVP_CIPHER_CTX *	ctx,
		uint8_t *	tag_buf,
		int	tag_size
	)

Definition at line 882 of file crypto_openssl.c.

◆ cipher_ctx_init()

void cipher_ctx_init	(	EVP_CIPHER_CTX *	ctx,
		const uint8_t *	key,
		const char *	ciphername,
		crypto_operation_t	enc
	)

Definition at line 858 of file crypto_openssl.c.

References ASSERT, cipher_get(), crypto_msg, EVP_CIPHER_free(), and M_FATAL.

◆ cipher_ctx_iv_length()

int cipher_ctx_iv_length ( const EVP_CIPHER_CTX * ctx )

Definition at line 876 of file crypto_openssl.c.

◆ cipher_ctx_mode()

int cipher_ctx_mode ( const EVP_CIPHER_CTX * ctx )

Definition at line 894 of file crypto_openssl.c.

◆ cipher_ctx_mode_aead()

bool cipher_ctx_mode_aead ( const cipher_ctx_t * ctx )

Check if the supplied cipher is a supported AEAD mode cipher.

Parameters

ctx	Cipher's context. May not be NULL.

Returns: true iff the cipher is a AEAD mode cipher.

Definition at line 939 of file crypto_openssl.c.

Referenced by key_ctx_update_implicit_iv(), openvpn_decrypt(), openvpn_encrypt(), and test_crypto().

◆ cipher_ctx_mode_cbc()

bool cipher_ctx_mode_cbc ( const cipher_ctx_t * ctx )

Check if the supplied cipher is a supported CBC mode cipher.

Parameters

ctx	Cipher's context. May not be NULL.

Returns: true iff the cipher is a CBC mode cipher.

Definition at line 905 of file crypto_openssl.c.

Referenced by openvpn_decrypt_v1(), and openvpn_encrypt_v1().

◆ cipher_ctx_mode_ofb_cfb()

bool cipher_ctx_mode_ofb_cfb ( const cipher_ctx_t * ctx )

Check if the supplied cipher is a supported OFB or CFB mode cipher.

Parameters

ctx	Cipher's context. May not be NULL.

Returns: true iff the cipher is a OFB or CFB mode cipher.

Definition at line 924 of file crypto_openssl.c.

References EVP_CIPHER_CTX_get_mode.

Referenced by openvpn_decrypt_v1(), and openvpn_encrypt_v1().

◆ cipher_ctx_new()

cipher_ctx_t * cipher_ctx_new ( void )

Generic cipher functions.

Allocate a new cipher context

Returns: a new cipher context

Definition at line 844 of file crypto_openssl.c.

References check_malloc_return().

Referenced by init_key_ctx().

◆ cipher_ctx_reset()

int cipher_ctx_reset	(	EVP_CIPHER_CTX *	ctx,
		const uint8_t *	iv_buf
	)

Definition at line 962 of file crypto_openssl.c.

◆ cipher_ctx_update()

int cipher_ctx_update	(	EVP_CIPHER_CTX *	ctx,
		uint8_t *	dst,
		int *	dst_len,
		uint8_t *	src,
		int	src_len
	)

Definition at line 979 of file crypto_openssl.c.

References crypto_msg, and M_FATAL.

◆ cipher_ctx_update_ad()

int cipher_ctx_update_ad	(	EVP_CIPHER_CTX *	ctx,
		const uint8_t *	src,
		int	src_len
	)

Definition at line 968 of file crypto_openssl.c.

References crypto_msg, and M_FATAL.

◆ cipher_get()

static evp_cipher_type * cipher_get ( const char * ciphername )

static

Definition at line 600 of file crypto_openssl.c.

References ASSERT, EVP_CIPHER_fetch(), and translate_cipher_name_from_openvpn().

Referenced by cipher_ctx_init(), cipher_kt_block_size(), cipher_kt_insecure(), cipher_kt_iv_size(), cipher_kt_key_size(), cipher_kt_mode_aead(), cipher_kt_mode_cbc(), cipher_kt_mode_ofb_cfb(), cipher_kt_name(), and cipher_valid_reason().

◆ cipher_kt_block_size()

int cipher_kt_block_size ( const char * ciphername )

Returns the block size of the cipher, in bytes.

Parameters

ciphername cipher name

Returns: Block size, in bytes.

Definition at line 691 of file crypto_openssl.c.

References cipher_get(), cleanup(), EVP_CIPHER_fetch(), EVP_CIPHER_free(), string_alloc(), translate_cipher_name_from_openvpn(), and translate_cipher_name_to_openvpn().

Referenced by adjust_payload_max_cbc(), calculate_crypto_overhead(), cipher_kt_insecure(), init_key_ctx(), init_key_type(), print_cipher(), and warn_insecure_key_type().

◆ cipher_kt_insecure()

bool cipher_kt_insecure ( const char * ciphername )

Returns true if we consider this cipher to be insecure.

Definition at line 753 of file crypto_openssl.c.

References cipher_get(), cipher_kt_block_size(), and EVP_CIPHER_free().

Referenced by show_available_ciphers(), tls_limit_reneg_bytes(), and warn_insecure_key_type().

◆ cipher_kt_iv_size()

int cipher_kt_iv_size ( const char * ciphername )

Returns the size of the IV used by the cipher, in bytes, or 0 if no IV is used.

Parameters

ciphername cipher name to lookup

Returns: Size of the IV, in bytes, or 0 if the cipher does not use an IV.

Definition at line 682 of file crypto_openssl.c.

References cipher_get(), and EVP_CIPHER_free().

Referenced by calculate_crypto_overhead(), epoch_data_key_derive(), and init_key_ctx().

◆ cipher_kt_key_size()

int cipher_kt_key_size ( const char * ciphername )

Returns the size of keys used by the cipher, in bytes.

If the cipher has a variable key size, return the default key size.

Parameters

ciphername Cipher name to lookup

Returns: (Default) size of keys used by the cipher, in bytes.

Definition at line 673 of file crypto_openssl.c.

References cipher_get(), and EVP_CIPHER_free().

Referenced by dco_new_key(), epoch_data_key_derive(), init_key_ctx(), key_is_zero(), key_print(), options_string(), and print_cipher().

◆ cipher_kt_mode()

int cipher_kt_mode ( const EVP_CIPHER * cipher_kt )

Definition at line 775 of file crypto_openssl.c.

References ASSERT.

Referenced by cipher_kt_mode_cbc(), and cipher_kt_mode_ofb_cfb().

◆ cipher_kt_mode_aead()

bool cipher_kt_mode_aead ( const char * ciphername )

Check if the supplied cipher is a supported AEAD mode cipher.

Parameters

ciphername name of the cipher

Returns: true iff the cipher is a AEAD mode cipher.

Definition at line 812 of file crypto_openssl.c.

References cipher_get(), EVP_CIPHER_free(), and OPENVPN_MODE_GCM.

Referenced by calculate_crypto_overhead(), cipher_get_aead_limits(), cipher_kt_tag_size(), collect_ciphers(), init_key_contexts(), init_key_type(), multi_client_set_protocol_options(), mutate_ncp_cipher_list(), p2p_ncp_set_options(), and tls_print_deferred_options_results().

◆ cipher_kt_mode_cbc()

bool cipher_kt_mode_cbc ( const char * ciphername )

Check if the supplied cipher is a supported CBC mode cipher.

Parameters

ciphername cipher name

Returns: true iff the cipher is a CBC mode cipher.

Definition at line 782 of file crypto_openssl.c.

References cipher_get(), cipher_kt_mode(), EVP_CIPH_FLAG_ENC_THEN_MAC, EVP_CIPHER_free(), and OPENVPN_MODE_CBC.

Referenced by adjust_payload_max_cbc(), calculate_crypto_overhead(), collect_ciphers(), frame_calculate_fragment(), frame_calculate_payload_overhead(), init_key_type(), mutate_ncp_cipher_list(), and print_cipher().

◆ cipher_kt_mode_ofb_cfb()

bool cipher_kt_mode_ofb_cfb ( const char * ciphername )

Check if the supplied cipher is a supported OFB or CFB mode cipher.

Parameters

ciphername cipher name

Returns: true iff the cipher is a OFB or CFB mode cipher.

Definition at line 799 of file crypto_openssl.c.

References cipher_get(), cipher_kt_mode(), EVP_CIPHER_free(), OPENVPN_MODE_CFB, and OPENVPN_MODE_OFB.

Referenced by calc_packet_id_size_dc(), collect_ciphers(), do_init_crypto_tls(), init_key_type(), mutate_ncp_cipher_list(), and tls_session_update_crypto_params_do_work().

◆ cipher_kt_name()

const char * cipher_kt_name ( const char * ciphername )

Retrieve a normalised string describing the cipher (e.g.

AES-128-CBC). The returned name is normalised to the OpenVPN config name in case the name differs from the name used by the crypto library.

Returns [null-cipher] in case the ciphername is none. NULL if the cipher is not valid.

Parameters

ciphername Name of the cipher

Returns: a statically allocated string describing the cipher.

Definition at line 653 of file crypto_openssl.c.

References ASSERT, cipher_get(), EVP_CIPHER_free(), and translate_cipher_name_to_openvpn().

Referenced by cipher_get_aead_limits(), init_key_contexts(), init_key_ctx(), key_print(), mutate_ncp_cipher_list(), options_string(), p2p_mode_ncp(), print_cipher(), test_translate_cipher(), and tls_print_deferred_options_results().

◆ cipher_kt_tag_size()

int cipher_kt_tag_size ( const char * ciphername )

Returns the MAC tag size of the cipher, in bytes.

Parameters

ciphername Name of the cipher

Returns: Tag size in bytes, or 0 if the tag size could not be determined.

Definition at line 740 of file crypto_openssl.c.

References cipher_kt_mode_aead(), and OPENVPN_AEAD_TAG_LENGTH.

Referenced by calculate_crypto_overhead().

◆ cipher_name_cmp()

static int cipher_name_cmp	(	const void *	a,
		const void *	b
	)

static

Definition at line 321 of file crypto_openssl.c.

References EVP_CIPHER_get0_name.

Referenced by show_available_ciphers().

◆ cipher_valid_reason()

bool cipher_valid_reason	(	const char *	ciphername,
		const char **	reason
	)

Returns if the cipher is valid, based on the given cipher name and provides a reason if invalid.

Parameters

ciphername	Name of the cipher to check for validity (e.g. `AES-128-CBC`). Will be translated to the library name from the openvpn config name if needed.
reason	Pointer where a static string indicating the reason for rejecting the cipher should be stored. It is set to NULL if the cipher is valid.

Returns: if the cipher is valid

Definition at line 609 of file crypto_openssl.c.

References cipher_get(), crypto_msg, D_LOW, EVP_CIPHER_free(), MAX_CIPHER_KEY_LENGTH, and msg.

Referenced by cipher_valid(), and print_cipher().

◆ collect_ciphers()

static void collect_ciphers	(	EVP_CIPHER *	cipher,
		void *	list
	)

static

Definition at line 337 of file crypto_openssl.c.

References cipher_kt_mode_aead(), cipher_kt_mode_cbc(), cipher_kt_mode_ofb_cfb(), EVP_CIPHER_get0_name, collect_ciphers::list, M_WARN, msg, collect_ciphers::num, and SIZE.

◆ crypto_clear_error()

void crypto_clear_error ( void )

Definition at line 224 of file crypto_openssl.c.

Referenced by openvpn_decrypt_aead(), openvpn_decrypt_v1(), openvpn_encrypt_aead(), openvpn_encrypt_v1(), tls_crypt_unwrap(), and tls_crypt_wrap().

◆ crypto_init_lib()

void crypto_init_lib ( void )

Definition at line 189 of file crypto_openssl.c.

Referenced by init_ssl_lib().

◆ crypto_init_lib_engine()

void crypto_init_lib_engine ( const char * engine_name )

Definition at line 139 of file crypto_openssl.c.

References ASSERT, M_WARN, and msg.

Referenced by init_crypto_pre().

◆ crypto_load_provider()

provider_t * crypto_load_provider ( const char * provider )

Load the given (OpenSSL) providers.

Parameters

provider name of providers to load

Returns: reference to the loaded provider

Definition at line 155 of file crypto_openssl.c.

References crypto_msg, M_FATAL, M_WARN, and msg.

Referenced by init_early(), and main().

◆ crypto_pem_decode()

bool crypto_pem_decode	(	const char *	name,
		struct buffer *	dst,
		const struct buffer *	src
	)

Decode a PEM buffer to binary data.

Parameters

name	The name expected in the PEM header/footer.
dst	Destination buffer for decoded data.
src	Source buffer (PEM data).

Returns: true iff PEM decode succeeded.

Definition at line 524 of file crypto_openssl.c.

References BCAP, BLEN, BPTR, buf_write_alloc(), cleanup(), crypto_msg, D_CRYPT_ERRORS, dmsg, and M_FATAL.

Referenced by crypto_pem_encode_decode_loopback(), and read_pem_key_file().

◆ crypto_pem_encode()

bool crypto_pem_encode	(	const char *	name,
		struct buffer *	dst,
		const struct buffer *	src,
		struct gc_arena *	gc
	)

Encode binary data as PEM.

Parameters

name	The name to use in the PEM header/footer.
dst	Destination buffer for PEM-encoded data. Must be a valid pointer to an uninitialized buffer structure. Iff this function returns true, the buffer will contain memory allocated through the supplied gc.
src	Source buffer.
gc	The garbage collector to use when allocating memory for dst.

Returns: true iff PEM encode succeeded.

Definition at line 496 of file crypto_openssl.c.

References alloc_buf_gc(), ASSERT, BLEN, BPTR, buf_write(), cleanup(), buffer::data, and gc.

Referenced by crypto_pem_encode_decode_loopback(), tls_crypt_v2_write_client_key_file(), and write_pem_key_file().

◆ crypto_print_openssl_errors()

void crypto_print_openssl_errors ( const unsigned int flags )

Retrieve any occurred OpenSSL errors and print those errors.

Note that this function uses the not thread-safe OpenSSL error API.

Parameters

flags Flags to indicate error type and priority.

Definition at line 230 of file crypto_openssl.c.

References check_debug_level(), D_CRYPT_ERRORS, D_TLS_DEBUG_MED, ERR_get_error_all(), and msg.

Referenced by tls_ctx_load_cert_pem_file(), tls_ctx_load_cert_uri(), and tls_ctx_load_pkcs12().

◆ crypto_uninit_lib()

void crypto_uninit_lib ( void )

Definition at line 204 of file crypto_openssl.c.

References ASSERT.

Referenced by free_ssl_lib().

◆ crypto_unload_provider()

void crypto_unload_provider	(	const char *	provname,
		provider_t *	provider
	)

Unloads the given (OpenSSL) provider.

Parameters

provname	name of the provider to unload
provider	pointer to the provider to unload

Definition at line 172 of file crypto_openssl.c.

References crypto_msg, and M_FATAL.

Referenced by main(), and uninit_early().

◆ hmac_ctx_cleanup()

void hmac_ctx_cleanup ( HMAC_CTX * ctx )

Definition at line 1220 of file crypto_openssl.c.

◆ hmac_ctx_final()

void hmac_ctx_final	(	HMAC_CTX *	ctx,
		uint8_t *	dst
	)

Definition at line 1256 of file crypto_openssl.c.

◆ hmac_ctx_free()

void hmac_ctx_free ( HMAC_CTX * ctx )

Definition at line 1197 of file crypto_openssl.c.

◆ hmac_ctx_init()

void hmac_ctx_init	(	HMAC_CTX *	ctx,
		const uint8_t *	key,
		const char *	mdname
	)

Definition at line 1203 of file crypto_openssl.c.

References ASSERT, crypto_msg, M_FATAL, and md_get().

◆ hmac_ctx_new()

HMAC_CTX * hmac_ctx_new ( void )

Definition at line 1189 of file crypto_openssl.c.

References check_malloc_return().

Referenced by crypto_test_hmac(), gen_hmac_md5(), init_key_ctx(), init_static_hmac(), ovpn_hkdf_expand(), and session_id_hmac_init().

◆ hmac_ctx_reset()

void hmac_ctx_reset ( HMAC_CTX * ctx )

Definition at line 1241 of file crypto_openssl.c.

References crypto_msg, and M_FATAL.

◆ hmac_ctx_size()

int hmac_ctx_size ( HMAC_CTX * ctx )

Definition at line 1231 of file crypto_openssl.c.

◆ hmac_ctx_update()

void hmac_ctx_update	(	HMAC_CTX *	ctx,
		const uint8_t *	src,
		int	src_len
	)

Definition at line 1250 of file crypto_openssl.c.

◆ md_ctx_cleanup()

void md_ctx_cleanup ( EVP_MD_CTX * ctx )

Definition at line 1156 of file crypto_openssl.c.

◆ md_ctx_final()

void md_ctx_final	(	EVP_MD_CTX *	ctx,
		uint8_t *	dst
	)

Definition at line 1174 of file crypto_openssl.c.

◆ md_ctx_free()

void md_ctx_free ( EVP_MD_CTX * ctx )

Definition at line 1136 of file crypto_openssl.c.

◆ md_ctx_init()

void md_ctx_init	(	EVP_MD_CTX *	ctx,
		const char *	mdname
	)

Definition at line 1142 of file crypto_openssl.c.

References ASSERT, crypto_msg, EVP_MD_free(), M_FATAL, and md_get().

◆ md_ctx_new()

EVP_MD_CTX * md_ctx_new ( void )

Definition at line 1128 of file crypto_openssl.c.

References check_malloc_return().

Referenced by DigestCalcHA1(), DigestCalcResponse(), and process_incoming_push_reply().

◆ md_ctx_size()

int md_ctx_size ( const EVP_MD_CTX * ctx )

Definition at line 1162 of file crypto_openssl.c.

◆ md_ctx_update()

void md_ctx_update	(	EVP_MD_CTX *	ctx,
		const uint8_t *	src,
		int	src_len
	)

Definition at line 1168 of file crypto_openssl.c.

◆ md_full()

int md_full	(	const char *	mdname,
		const uint8_t *	src,
		int	src_len,
		uint8_t *	dst
	)

Calculates the message digest for the given buffer.

Parameters

mdname	message digest name
src	Buffer to digest. May not be NULL.
src_len	The length of the incoming buffer.
dst	Buffer to write the message digest to. May not be NULL.

Returns: 1 on success, 0 on failure

Definition at line 1117 of file crypto_openssl.c.

References EVP_MD_free(), and md_get().

Referenced by gen_md4_hash().

◆ md_get()

static evp_md_type * md_get ( const char * digest )

static

Definition at line 1019 of file crypto_openssl.c.

References ASSERT, crypto_msg, EVP_MD_fetch(), M_FATAL, and MAX_HMAC_KEY_LENGTH.

Referenced by hmac_ctx_init(), md_ctx_init(), md_full(), md_kt_name(), and md_kt_size().

◆ md_kt_name()

const char * md_kt_name ( const char * mdname )

Retrieve a string describing the digest digest (e.g.

SHA1).

Parameters

mdname Message digest name

Returns: Statically allocated string describing the message digest.

Definition at line 1073 of file crypto_openssl.c.

References digest_name_translation_table, digest_name_translation_table_count, EVP_MD_free(), EVP_MD_get0_name, i, cipher_name_pair::lib_name, md_get(), and cipher_name_pair::openvpn_name.

Referenced by init_key_ctx(), key_print(), options_string(), print_digest(), and tls_print_deferred_options_results().

◆ md_kt_size()

unsigned char md_kt_size ( const char * mdname )

Returns the size of the message digest, in bytes.

Parameters

mdname Message digest name

Returns: Message digest size, in bytes, or 0 if ctx was NULL.

Definition at line 1097 of file crypto_openssl.c.

References EVP_MD_free(), and md_get().

Referenced by calculate_crypto_overhead(), crypto_test_hmac(), init_key_ctx(), init_key_type(), and key_print().

◆ md_valid()

bool md_valid ( const char * digest )

Return if a message digest parameters is valid given the name of the digest.

Parameters

digest Name of the digest to verify, e.g. MD5).

Returns: Whether a digest of the given name is available

Definition at line 1041 of file crypto_openssl.c.

References EVP_MD_fetch(), and EVP_MD_free().

Referenced by create_kt(), do_init_tls_wrap_key(), init_static_hmac(), main(), and session_id_hmac_init().

◆ memcmp_constant_time()

int memcmp_constant_time	(	const void *	a,
		const void *	b,
		size_t	size
	)

As memcmp(), but constant-time.

Returns 0 when data is equal, non-zero otherwise.

Definition at line 1355 of file crypto_openssl.c.

Referenced by check_hmac_token(), check_session_hmac_and_pkt_id(), is_auth_token(), man_check_password(), openvpn_decrypt_v1(), tls_crypt_unwrap(), tls_crypt_v2_unwrap_client_key(), verify_auth_token(), and verify_cert().

◆ print_digest()

void print_digest	(	EVP_MD *	digest,
		void *	unused
	)

Definition at line 425 of file crypto_openssl.c.

References EVP_MD_get0_name, and md_kt_name().

Referenced by show_available_digests().

◆ rand_bytes()

int rand_bytes	(	uint8_t *	output,
		int	len
	)

Wrapper for secure random number generator.

Retrieves len bytes of random data, and places it in output.

Parameters

output	Output buffer
len	Length of the output buffer, in bytes

Returns: 1 on success, 0 on failure

Definition at line 583 of file crypto_openssl.c.

References crypto_msg, D_CRYPT_ERRORS, and unlikely.

Referenced by do_data_channel_round_trip(), encrypt_one_packet(), establish_http_proxy_passthru(), generate_auth_token(), generate_ephemeral_key(), generate_key_random(), init_crypto_options(), prng_bytes(), random_bytes_to_buf(), session_id_hmac_init(), test_crypto(), test_tls_crypt_v2_setup(), tls_crypt_v2_wrap_unwrap_dst_too_small(), tls_crypt_v2_wrap_unwrap_max_metadata(), tls_crypt_v2_write_client_key_file(), and write_pem_key_file().

◆ show_available_ciphers()

void show_available_ciphers ( void )

Definition at line 364 of file crypto_openssl.c.

References cipher_kt_insecure(), cipher_name_cmp(), EVP_CIPHER_get0_name, i, collect_ciphers::list, collect_ciphers::num, and print_cipher().

Referenced by print_openssl_info().

◆ show_available_digests()

void show_available_digests ( void )

Definition at line 432 of file crypto_openssl.c.

References print_digest().

Referenced by print_openssl_info().

◆ show_available_engines()

void show_available_engines ( void )

Definition at line 473 of file crypto_openssl.c.

Referenced by print_openssl_info().

◆ ssl_tls1_PRF()

bool ssl_tls1_PRF	(	const uint8_t *	seed,
		size_t	seed_len,
		const uint8_t *	secret,
		size_t	secret_len,
		uint8_t *	output,
		size_t	output_len
	)

Calculates the TLS 1.0-1.1 PRF function.

For the exact specification of the function definition see the TLS RFCs like RFC 4346.

Parameters

seed	seed to use
seed_len	length of the seed
secret	secret to use
secret_len	length of the secret
output	output destination
output_len	length of output/number of bytes to generate

Returns: true if successful, false on any error

Definition at line 1424 of file crypto_openssl.c.

Referenced by check_tls_prf_working(), crypto_test_tls_prf(), and openvpn_PRF().

Variable Documentation

◆ cipher_name_translation_table

const cipher_name_pair cipher_name_translation_table[]

Initial value:

= {
    { "AES-128-GCM", "id-aes128-GCM" },
    { "AES-192-GCM", "id-aes192-GCM" },
    { "AES-256-GCM", "id-aes256-GCM" },
    { "CHACHA20-POLY1305", "ChaCha20-Poly1305" },
}

Cipher name translation table.

Definition at line 310 of file crypto_openssl.c.

Referenced by get_cipher_name_pair().

◆ cipher_name_translation_table_count

const size_t cipher_name_translation_table_count

Initial value:

=

sizeof(cipher_name_translation_table) / sizeof(*cipher_name_translation_table)

cipher_name_translation_table

const cipher_name_pair cipher_name_translation_table[]

Cipher name translation table.

Definition crypto_openssl.c:310

Definition at line 316 of file crypto_openssl.c.

Referenced by get_cipher_name_pair().

◆ digest_name_translation_table

const cipher_name_pair digest_name_translation_table[]

Initial value:

= {
    { "BLAKE2s256", "BLAKE2S-256" },
    { "BLAKE2b512", "BLAKE2B-512" },
    { "RIPEMD160", "RIPEMD-160" },
    { "SHA224", "SHA2-224" },
    { "SHA256", "SHA2-256" },
    { "SHA384", "SHA2-384" },
    { "SHA512", "SHA2-512" },
    { "SHA512-224", "SHA2-512/224" },
    { "SHA512-256", "SHA2-512/256" },
    { "SHAKE128", "SHAKE-128" },
    { "SHAKE256", "SHAKE-256" },
}

Definition at line 1056 of file crypto_openssl.c.

Referenced by md_kt_name().

◆ digest_name_translation_table_count

const size_t digest_name_translation_table_count

Initial value:

=

sizeof(digest_name_translation_table) / sizeof(*digest_name_translation_table)

digest_name_translation_table

const cipher_name_pair digest_name_translation_table[]

Definition crypto_openssl.c:1056

Definition at line 1069 of file crypto_openssl.c.

Referenced by md_kt_name().

Data Structures

Functions

Variables

Detailed Description

Function Documentation

◆ cipher_ctx_block_size()

◆ cipher_ctx_final()

◆ cipher_ctx_final_check_tag()

◆ cipher_ctx_free()

◆ cipher_ctx_get_tag()

◆ cipher_ctx_init()

◆ cipher_ctx_iv_length()

◆ cipher_ctx_mode()

◆ cipher_ctx_mode_aead()

◆ cipher_ctx_mode_cbc()

◆ cipher_ctx_mode_ofb_cfb()

◆ cipher_ctx_new()

◆ cipher_ctx_reset()

◆ cipher_ctx_update()

◆ cipher_ctx_update_ad()

◆ cipher_get()

◆ cipher_kt_block_size()

◆ cipher_kt_insecure()

◆ cipher_kt_iv_size()

◆ cipher_kt_key_size()

◆ cipher_kt_mode()

◆ cipher_kt_mode_aead()

◆ cipher_kt_mode_cbc()

◆ cipher_kt_mode_ofb_cfb()

◆ cipher_kt_name()

◆ cipher_kt_tag_size()

◆ cipher_name_cmp()

◆ cipher_valid_reason()

◆ collect_ciphers()

◆ crypto_clear_error()

◆ crypto_init_lib()

◆ crypto_init_lib_engine()

◆ crypto_load_provider()

◆ crypto_pem_decode()

◆ crypto_pem_encode()

◆ crypto_print_openssl_errors()

◆ crypto_uninit_lib()

◆ crypto_unload_provider()

◆ hmac_ctx_cleanup()

◆ hmac_ctx_final()

◆ hmac_ctx_free()

◆ hmac_ctx_init()

◆ hmac_ctx_new()

◆ hmac_ctx_reset()

◆ hmac_ctx_size()

◆ hmac_ctx_update()

◆ md_ctx_cleanup()

◆ md_ctx_final()

◆ md_ctx_free()

◆ md_ctx_init()

◆ md_ctx_new()

◆ md_ctx_size()

◆ md_ctx_update()

◆ md_full()

◆ md_get()

◆ md_kt_name()

◆ md_kt_size()

◆ md_valid()

◆ memcmp_constant_time()

◆ print_digest()

◆ rand_bytes()

◆ show_available_ciphers()

◆ show_available_digests()

◆ show_available_engines()

◆ ssl_tls1_PRF()

Variable Documentation

◆ cipher_name_translation_table

◆ cipher_name_translation_table_count

◆ digest_name_translation_table

◆ digest_name_translation_table_count