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Data Structures | Functions | Variables
crypto_openssl.c File Reference
#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_tcrypto_load_provider (const char *provider)
 Load the given (OpenSSL) providers. More...
 
void crypto_unload_provider (const char *provname, provider_t *provider)
 Unloads the given (OpenSSL) provider. More...
 
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. More...
 
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. More...
 
bool crypto_pem_decode (const char *name, struct buffer *dst, const struct buffer *src)
 Decode a PEM buffer to binary data. More...
 
int rand_bytes (uint8_t *output, int len)
 Wrapper for secure random number generator. More...
 
static evp_cipher_typecipher_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. More...
 
const char * cipher_kt_name (const char *ciphername)
 Retrieve a normalised string describing the cipher (e.g. More...
 
int cipher_kt_key_size (const char *ciphername)
 Returns the size of keys used by the cipher, in bytes. More...
 
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. More...
 
int cipher_kt_block_size (const char *ciphername)
 Returns the block size of the cipher, in bytes. More...
 
int cipher_kt_tag_size (const char *ciphername)
 Returns the MAC tag size of the cipher, in bytes. More...
 
bool cipher_kt_insecure (const char *ciphername)
 Returns true if we consider this cipher to be insecure. More...
 
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. More...
 
bool cipher_kt_mode_ofb_cfb (const char *ciphername)
 Check if the supplied cipher is a supported OFB or CFB mode cipher. More...
 
bool cipher_kt_mode_aead (const char *ciphername)
 Check if the supplied cipher is a supported AEAD mode cipher. More...
 
cipher_ctx_tcipher_ctx_new (void)
 Generic cipher functions. More...
 
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. More...
 
bool cipher_ctx_mode_ofb_cfb (const cipher_ctx_t *ctx)
 Check if the supplied cipher is a supported OFB or CFB mode cipher. More...
 
bool cipher_ctx_mode_aead (const cipher_ctx_t *ctx)
 Check if the supplied cipher is a supported AEAD mode cipher. More...
 
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_typemd_get (const char *digest)
 
bool md_valid (const char *digest)
 Return if a message digest parameters is valid given the name of the digest. More...
 
const char * md_kt_name (const char *mdname)
 Retrieve a string describing the digest digest (e.g. More...
 
unsigned char md_kt_size (const char *mdname)
 Returns the size of the message digest, in bytes. More...
 
int md_full (const char *mdname, const uint8_t *src, int src_len, uint8_t *dst)
 Calculates the message digest for the given buffer. More...
 
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. More...
 
bool ssl_tls1_PRF (const uint8_t *seed, int seed_len, const uint8_t *secret, int secret_len, uint8_t *output, int output_len)
 Calculates the TLS 1.0-1.1 PRF function. More...
 

Variables

const cipher_name_pair cipher_name_translation_table []
 Cipher name translation table. More...
 
const size_t cipher_name_translation_table_count
 
const cipher_name_pair digest_name_translation_table []
 
const size_t digest_name_translation_table_count
 

Function Documentation

◆ cipher_ctx_block_size()

int cipher_ctx_block_size ( const EVP_CIPHER_CTX *  ctx)

Definition at line 892 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 990 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 996 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 856 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 886 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 862 of file crypto_openssl.c.

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

◆ cipher_ctx_iv_length()

int cipher_ctx_iv_length ( const EVP_CIPHER_CTX *  ctx)

Definition at line 880 of file crypto_openssl.c.

◆ cipher_ctx_mode()

int cipher_ctx_mode ( const EVP_CIPHER_CTX *  ctx)

Definition at line 898 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
ctxCipher'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 init_implicit_iv(), 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
ctxCipher'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
ctxCipher'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 848 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

◆ cipher_kt_block_size()

int cipher_kt_block_size ( const char *  ciphername)

◆ cipher_kt_insecure()

bool cipher_kt_insecure ( const char *  ciphername)

Returns true if we consider this cipher to be insecure.

Definition at line 759 of file crypto_openssl.c.

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

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
ciphernamecipher name to lookup
Returns
Size of the IV, in bytes, or 0 if the cipher does not use an IV.

Definition at line 688 of file crypto_openssl.c.

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

Referenced by calculate_crypto_overhead(), 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
ciphernameCipher name to lookup
Returns
(Default) size of keys used by the cipher, in bytes.

Definition at line 679 of file crypto_openssl.c.

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

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

◆ cipher_kt_mode()

int cipher_kt_mode ( const EVP_CIPHER *  cipher_kt)

Definition at line 782 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
ciphernamename of the cipher
Returns
true iff the cipher is a AEAD mode cipher.

Definition at line 816 of file crypto_openssl.c.

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

Referenced by calculate_crypto_overhead(), cipher_kt_tag_size(), collect_ciphers(), init_key_type(), mutate_ncp_cipher_list(), 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
ciphernamecipher name
Returns
true iff the cipher is a CBC mode cipher.

Definition at line 789 of file crypto_openssl.c.

References cipher_get(), cipher_kt_mode(), EVP_CIPHER_free(), evp_cipher_type, 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
ciphernamecipher name
Returns
true iff the cipher is a OFB or CFB mode cipher.

Definition at line 804 of file crypto_openssl.c.

References cipher_get(), cipher_kt_mode(), EVP_CIPHER_free(), evp_cipher_type, 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
ciphernameName of the cipher
Returns
a statically allocated string describing the cipher.

Definition at line 659 of file crypto_openssl.c.

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

Referenced by 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
ciphernameName of the cipher
Returns
Tag size in bytes, or 0 if the tag size could not be determined.

Definition at line 746 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 327 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
ciphernameName 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.
reasonPointer 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 618 of file crypto_openssl.c.

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

Referenced by cipher_valid(), and print_cipher().

◆ collect_ciphers()

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

◆ crypto_clear_error()

void crypto_clear_error ( void  )

◆ crypto_init_lib()

void crypto_init_lib ( void  )

Definition at line 194 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 144 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
providername of providers to load
Returns
reference to the loaded provider

Definition at line 160 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
nameThe name expected in the PEM header/footer.
dstDestination buffer for decoded data.
srcSource buffer (PEM data).
Returns
true iff PEM decode succeeded.

Definition at line 530 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
nameThe name to use in the PEM header/footer.
dstDestination 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.
srcSource buffer.
gcThe garbage collector to use when allocating memory for dst.
Returns
true iff PEM encode succeeded.

Definition at line 502 of file crypto_openssl.c.

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

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
flagsFlags to indicate error type and priority.

Definition at line 235 of file crypto_openssl.c.

Referenced by tls_ctx_load_cert_file(), and tls_ctx_load_pkcs12().

◆ crypto_uninit_lib()

void crypto_uninit_lib ( void  )

Definition at line 209 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
provnamename of the provider to unload
providerpointer to the provider to unload

Definition at line 177 of file crypto_openssl.c.

References crypto_msg, and M_FATAL.

Referenced by uninit_early().

◆ hmac_ctx_cleanup()

void hmac_ctx_cleanup ( HMAC_CTX *  ctx)

Definition at line 1217 of file crypto_openssl.c.

◆ hmac_ctx_final()

void hmac_ctx_final ( HMAC_CTX *  ctx,
uint8_t *  dst 
)

Definition at line 1244 of file crypto_openssl.c.

◆ hmac_ctx_free()

void hmac_ctx_free ( HMAC_CTX *  ctx)

Definition at line 1194 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 1200 of file crypto_openssl.c.

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

◆ hmac_ctx_new()

HMAC_CTX* hmac_ctx_new ( void  )

◆ hmac_ctx_reset()

void hmac_ctx_reset ( HMAC_CTX *  ctx)

Definition at line 1229 of file crypto_openssl.c.

References crypto_msg, and M_FATAL.

◆ hmac_ctx_size()

int hmac_ctx_size ( HMAC_CTX *  ctx)

Definition at line 1223 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 1238 of file crypto_openssl.c.

◆ md_ctx_cleanup()

void md_ctx_cleanup ( EVP_MD_CTX *  ctx)

Definition at line 1153 of file crypto_openssl.c.

◆ md_ctx_final()

void md_ctx_final ( EVP_MD_CTX *  ctx,
uint8_t *  dst 
)

Definition at line 1171 of file crypto_openssl.c.

◆ md_ctx_free()

void md_ctx_free ( EVP_MD_CTX *  ctx)

Definition at line 1133 of file crypto_openssl.c.

◆ md_ctx_init()

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

Definition at line 1139 of file crypto_openssl.c.

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

◆ md_ctx_new()

EVP_MD_CTX* md_ctx_new ( void  )

◆ md_ctx_size()

int md_ctx_size ( const EVP_MD_CTX *  ctx)

Definition at line 1159 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 1165 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
mdnamemessage digest name
srcBuffer to digest. May not be NULL.
src_lenThe length of the incoming buffer.
dstBuffer to write the message digest to. May not be NULL.
Returns
1 on success, 0 on failure

Definition at line 1114 of file crypto_openssl.c.

References EVP_MD_free(), evp_md_type, and md_get().

Referenced by gen_md4_hash().

◆ md_get()

static evp_md_type* md_get ( const char *  digest)
static

◆ md_kt_name()

const char* md_kt_name ( const char *  mdname)

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

SHA1).

Parameters
mdnameMessage digest name
Returns
Statically allocated string describing the message digest.

Definition at line 1070 of file crypto_openssl.c.

References digest_name_translation_table, digest_name_translation_table_count, EVP_MD_free(), EVP_MD_get0_name, evp_md_type, 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
mdnameMessage digest name
Returns
Message digest size, in bytes, or 0 if ctx was NULL.

Definition at line 1094 of file crypto_openssl.c.

References EVP_MD_free(), evp_md_type, and md_get().

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

◆ md_valid()

bool md_valid ( const char *  digest)

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

Parameters
digestName of the digest to verify, e.g. MD5).
Returns
Whether a digest of the given name is available

Definition at line 1038 of file crypto_openssl.c.

References EVP_MD_fetch(), EVP_MD_free(), and evp_md_type.

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 1345 of file crypto_openssl.c.

Referenced by check_hmac_token(), check_session_id_hmac(), 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 429 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
outputOutput buffer
lenLength of the output buffer, in bytes
Returns
1 on success, 0 on failure

Definition at line 592 of file crypto_openssl.c.

References crypto_msg, D_CRYPT_ERRORS, and unlikely.

Referenced by do_data_channel_round_trip(), establish_http_proxy_passthru(), generate_auth_token(), generate_ephemeral_key(), generate_key_random(), init_crypto_options(), init_implicit_iv(), 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  )

◆ show_available_digests()

void show_available_digests ( void  )

Definition at line 436 of file crypto_openssl.c.

References PACKAGE_NAME, and print_digest().

Referenced by print_openssl_info().

◆ show_available_engines()

void show_available_engines ( void  )

Definition at line 477 of file crypto_openssl.c.

Referenced by print_openssl_info().

◆ ssl_tls1_PRF()

bool ssl_tls1_PRF ( const uint8_t *  seed,
int  seed_len,
const uint8_t *  secret,
int  secret_len,
uint8_t *  output,
int  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
seedseed to use
seed_lenlength of the seed
secretsecret to use
secret_lenlength of the secret
outputoutput destination
output_lenlength of output/number of bytes to generate
Returns
true if successful, false on any error

Definition at line 1402 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 316 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:

Definition at line 322 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 1053 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:

Definition at line 1066 of file crypto_openssl.c.

Referenced by md_kt_name().

cipher_name_translation_table
const cipher_name_pair cipher_name_translation_table[]
Cipher name translation table.
Definition: crypto_openssl.c:316
digest_name_translation_table
const cipher_name_pair digest_name_translation_table[]
Definition: crypto_openssl.c:1053