=head1 NAME
-EVP_CIPHER_CTX_init, EVP_EncryptInit_ex, EVP_EncryptUpdate,
-EVP_EncryptFinal_ex, EVP_DecryptInit_ex, EVP_DecryptUpdate,
-EVP_DecryptFinal_ex, EVP_CipherInit_ex, EVP_CipherUpdate,
-EVP_CipherFinal_ex, EVP_CIPHER_CTX_set_key_length,
-EVP_CIPHER_CTX_ctrl, EVP_CIPHER_CTX_cleanup, EVP_EncryptInit,
+EVP_CIPHER_CTX_new, EVP_CIPHER_CTX_reset, EVP_CIPHER_CTX_free,
+EVP_EncryptInit_ex, EVP_EncryptUpdate, EVP_EncryptFinal_ex,
+EVP_DecryptInit_ex, EVP_DecryptUpdate, EVP_DecryptFinal_ex,
+EVP_CipherInit_ex, EVP_CipherUpdate, EVP_CipherFinal_ex,
+EVP_CIPHER_CTX_set_key_length, EVP_CIPHER_CTX_ctrl, EVP_EncryptInit,
EVP_EncryptFinal, EVP_DecryptInit, EVP_DecryptFinal,
EVP_CipherInit, EVP_CipherFinal, EVP_get_cipherbyname,
EVP_get_cipherbynid, EVP_get_cipherbyobj, EVP_CIPHER_nid,
EVP_des_cfb, EVP_des_ofb, EVP_des_ede_cbc, EVP_des_ede, EVP_des_ede_ofb,
EVP_des_ede_cfb, EVP_des_ede3_cbc, EVP_des_ede3, EVP_des_ede3_ofb,
EVP_des_ede3_cfb, EVP_desx_cbc, EVP_rc4, EVP_rc4_40, EVP_idea_cbc,
-EVP_idea_ecb, EVP_idea_cfb, EVP_idea_ofb, EVP_idea_cbc, EVP_rc2_cbc,
+EVP_idea_ecb, EVP_idea_cfb, EVP_idea_ofb, EVP_rc2_cbc,
EVP_rc2_ecb, EVP_rc2_cfb, EVP_rc2_ofb, EVP_rc2_40_cbc, EVP_rc2_64_cbc,
EVP_bf_cbc, EVP_bf_ecb, EVP_bf_cfb, EVP_bf_ofb, EVP_cast5_cbc,
EVP_cast5_ecb, EVP_cast5_cfb, EVP_cast5_ofb, EVP_rc5_32_12_16_cbc,
#include <openssl/evp.h>
- void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *a);
+ EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void);
+ int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx);
+ void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx);
int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
ENGINE *impl, unsigned char *key, unsigned char *iv);
int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *x, int padding);
int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *x, int keylen);
int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr);
- int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *a);
const EVP_CIPHER *EVP_get_cipherbyname(const char *name);
#define EVP_get_cipherbynid(a) EVP_get_cipherbyname(OBJ_nid2sn(a))
#define EVP_CIPHER_mode(e) ((e)->flags) & EVP_CIPH_MODE)
int EVP_CIPHER_type(const EVP_CIPHER *ctx);
- #define EVP_CIPHER_CTX_cipher(e) ((e)->cipher)
- #define EVP_CIPHER_CTX_nid(e) ((e)->cipher->nid)
- #define EVP_CIPHER_CTX_block_size(e) ((e)->cipher->block_size)
- #define EVP_CIPHER_CTX_key_length(e) ((e)->key_len)
- #define EVP_CIPHER_CTX_iv_length(e) ((e)->cipher->iv_len)
- #define EVP_CIPHER_CTX_get_app_data(e) ((e)->app_data)
- #define EVP_CIPHER_CTX_set_app_data(e,d) ((e)->app_data=(char *)(d))
- #define EVP_CIPHER_CTX_type(c) EVP_CIPHER_type(EVP_CIPHER_CTX_cipher(c))
- #define EVP_CIPHER_CTX_flags(e) ((e)->cipher->flags)
- #define EVP_CIPHER_CTX_mode(e) ((e)->cipher->flags & EVP_CIPH_MODE)
+ const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx);
+ int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx);
+ int EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx);
+ int EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx);
+ int EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx);
+ void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx);
+ void EVP_CIPHER_CTX_set_app_data(const EVP_CIPHER_CTX *ctx, void *data);
+ int EVP_CIPHER_CTX_type(const EVP_CIPHER_CTX *ctx);
+ void EVP_CIPHER_CTX_set_flags(const EVP_CIPHER_CTX *ctx, int flags);
+ void EVP_CIPHER_CTX_clear_flags(const EVP_CIPHER_CTX *ctx, int flags);
+ int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags);
+ int EVP_CIPHER_CTX_mode(const EVP_CIPHER_CTX *ctx);
int EVP_CIPHER_param_to_asn1(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
int EVP_CIPHER_asn1_to_param(EVP_CIPHER_CTX *c, ASN1_TYPE *type);
The EVP cipher routines are a high level interface to certain
symmetric ciphers.
-EVP_CIPHER_CTX_init() initializes cipher contex B<ctx>.
+EVP_CIPHER_CTX_new() creates a cipher context.
+
+EVP_CIPHER_CTX_free() clears all information from a cipher context
+and free up any allocated memory associate with it, including B<ctx>
+itself. This function should be called after all operations using a
+cipher are complete so sensitive information does not remain in
+memory.
EVP_EncryptInit_ex() sets up cipher context B<ctx> for encryption
-with cipher B<type> from ENGINE B<impl>. B<ctx> must be initialized
+with cipher B<type> from ENGINE B<impl>. B<ctx> must be created
before calling this function. B<type> is normally supplied
-by a function such as EVP_des_cbc(). If B<impl> is NULL then the
+by a function such as EVP_aes_256_cbc(). If B<impl> is NULL then the
default implementation is used. B<key> is the symmetric key to use
and B<iv> is the IV to use (if necessary), the actual number of bytes
used for the key and IV depends on the cipher. It is possible to set
If padding is enabled (the default) then EVP_EncryptFinal_ex() encrypts
the "final" data, that is any data that remains in a partial block.
-It uses L<standard block padding|/NOTES> (aka PKCS padding). The encrypted
+It uses standard block padding (aka PKCS padding) as described in
+the NOTES section, below. The encrypted
final data is written to B<out> which should have sufficient space for
one cipher block. The number of bytes written is placed in B<outl>. After
this function is called the encryption operation is finished and no further
to 1 for encryption, 0 for decryption and -1 to leave the value unchanged
(the actual value of 'enc' being supplied in a previous call).
-EVP_CIPHER_CTX_cleanup() clears all information from a cipher context
-and free up any allocated memory associate with it. It should be called
-after all operations using a cipher are complete so sensitive information
-does not remain in memory.
+EVP_CIPHER_CTX_reset() clears all information from a cipher context
+and free up any allocated memory associate with it, except the B<ctx>
+itself. This function should be called anytime B<ctx> is to be reused
+for another EVP_CipherInit() / EVP_CipherUpdate() / EVP_CipherFinal()
+series of calls.
EVP_EncryptInit(), EVP_DecryptInit() and EVP_CipherInit() behave in a
similar way to EVP_EncryptInit_ex(), EVP_DecryptInit_ex() and
=head1 RETURN VALUES
+EVP_CIPHER_CTX_new() returns a pointer to a newly created
+B<EVP_CIPHER_CTX> for success and B<NULL> for failure.
+
EVP_EncryptInit_ex(), EVP_EncryptUpdate() and EVP_EncryptFinal_ex()
return 1 for success and 0 for failure.
EVP_CipherInit_ex() and EVP_CipherUpdate() return 1 for success and 0 for failure.
EVP_CipherFinal_ex() returns 0 for a decryption failure or 1 for success.
-EVP_CIPHER_CTX_cleanup() returns 1 for success and 0 for failure.
+EVP_CIPHER_CTX_reset() returns 1 for success and 0 for failure.
EVP_get_cipherbyname(), EVP_get_cipherbynid() and EVP_get_cipherbyobj()
return an B<EVP_CIPHER> structure or NULL on error.
EVP_CIPHER_CTX_cipher() returns an B<EVP_CIPHER> structure.
-EVP_CIPHER_param_to_asn1() and EVP_CIPHER_asn1_to_param() return 1 for
-success or zero for failure.
+EVP_CIPHER_param_to_asn1() and EVP_CIPHER_asn1_to_param() return greater
+than zero for success and zero or a negative number.
=head1 CIPHER LISTING
This is obsolete and new code should use EVP_rc4()
and the EVP_CIPHER_CTX_set_key_length() function.
-=item EVP_idea_cbc() EVP_idea_ecb(), EVP_idea_cfb(), EVP_idea_ofb(), EVP_idea_cbc()
+=item EVP_idea_cbc() EVP_idea_ecb(), EVP_idea_cfb(), EVP_idea_ofb()
IDEA encryption algorithm in CBC, ECB, CFB and OFB modes respectively.
AES Galois Counter Mode (GCM) for 128, 192 and 256 bit keys respectively.
These ciphers require additional control operations to function correctly: see
-L<GCM mode> section below for details.
+the L<GCM and OCB modes> section below for details.
+
+=item EVP_aes_128_ocb(void), EVP_aes_192_ocb(void), EVP_aes_256_ocb(void)
+
+Offest Codebook Mode (OCB) for 128, 192 and 256 bit keys respectively.
+These ciphers require additional control operations to function correctly: see
+the L<GCM and OCB modes> section below for details.
=item EVP_aes_128_ccm(), EVP_aes_192_ccm(), EVP_aes_256_ccm()
=back
-=head1 GCM Mode
+=head1 GCM and OCB Modes
-For GCM mode ciphers the behaviour of the EVP interface is subtly altered and
-several GCM specific ctrl operations are supported.
+For GCM and OCB mode ciphers the behaviour of the EVP interface is subtly
+altered and several additional ctrl operations are supported.
To specify any additional authenticated data (AAD) a call to EVP_CipherUpdate(),
EVP_EncryptUpdate() or EVP_DecryptUpdate() should be made with the output
the authentication operation has failed and any output data B<MUST NOT>
be used as it is corrupted.
-The following ctrls are supported in GCM mode:
+The following ctrls are supported in both GCM and OCB modes:
- EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, ivlen, NULL);
+ EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL);
-Sets the GCM IV length: this call can only be made before specifying an IV. If
-not called a default IV length is used (96 bits for AES).
+Sets the IV length: this call can only be made before specifying an IV. If
+not called a default IV length is used. For GCM AES and OCB AES the default is
+12 (i.e. 96 bits). For OCB mode the maximum is 15.
- EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, taglen, tag);
+ EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_GET_TAG, taglen, tag);
Writes B<taglen> bytes of the tag value to the buffer indicated by B<tag>.
This call can only be made when encrypting data and B<after> all data has been
-processed (e.g. after an EVP_EncryptFinal() call).
+processed (e.g. after an EVP_EncryptFinal() call). For OCB mode the taglen must
+either be 16 or the value previously set via EVP_CTRL_OCB_SET_TAGLEN.
- EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, taglen, tag);
+ EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, taglen, tag);
Sets the expected tag to B<taglen> bytes from B<tag>. This call is only legal
when decrypting data and must be made B<before> any data is processed (e.g.
-before any EVP_DecryptUpdate() call).
+before any EVP_DecryptUpdate() call). For OCB mode the taglen must
+either be 16 or the value previously set via EVP_CTRL_AEAD_SET_TAG.
+
+In OCB mode calling this with B<tag> set to NULL sets the tag length. The tag
+length can only be set before specifying an IV. If not called a default tag
+length is used. For OCB AES the default is 16 (i.e. 128 bits). This is also the
+maximum tag length for OCB.
See L<EXAMPLES> below for an example of the use of GCM mode.
=head1 CCM Mode
-The behaviour of CCM mode ciphers is similar to CCM mode but with a few
+The behaviour of CCM mode ciphers is similar to GCM mode but with a few
additional requirements and different ctrl values.
-Like GCM mode any additional authenticated data (AAD) is passed by calling
+Like GCM and OCB modes any additional authenticated data (AAD) is passed by calling
EVP_CipherUpdate(), EVP_EncryptUpdate() or EVP_DecryptUpdate() with the output
parameter B<out> set to B<NULL>. Additionally the total plaintext or ciphertext
length B<MUST> be passed to EVP_CipherUpdate(), EVP_EncryptUpdate() or
The following ctrls are supported in CCM mode:
- EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG, taglen, tag);
+ EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG, taglen, tag);
This call is made to set the expected B<CCM> tag value when decrypting or
the length of the tag (with the B<tag> parameter set to NULL) when encrypting.
Sets the CCM B<L> value. If not set a default is used (8 for AES).
- EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_IVLEN, ivlen, NULL);
+ EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_IVLEN, ivlen, NULL);
Sets the CCM nonce (IV) length: this call can only be made before specifying
an nonce value. The nonce length is given by B<15 - L> so it is 7 by default
Encrypt a string using IDEA:
int do_crypt(char *outfile)
- {
+ {
unsigned char outbuf[1024];
int outlen, tmplen;
/* Bogus key and IV: we'd normally set these from
EVP_CIPHER_CTX ctx;
FILE *out;
- EVP_CIPHER_CTX_init(&ctx);
- EVP_EncryptInit_ex(&ctx, EVP_idea_cbc(), NULL, key, iv);
+ ctx = EVP_CIPHER_CTX_new();
+ EVP_EncryptInit_ex(ctx, EVP_idea_cbc(), NULL, key, iv);
- if(!EVP_EncryptUpdate(&ctx, outbuf, &outlen, intext, strlen(intext)))
+ if(!EVP_EncryptUpdate(ctx, outbuf, &outlen, intext, strlen(intext)))
{
/* Error */
return 0;
/* Buffer passed to EVP_EncryptFinal() must be after data just
* encrypted to avoid overwriting it.
*/
- if(!EVP_EncryptFinal_ex(&ctx, outbuf + outlen, &tmplen))
+ if(!EVP_EncryptFinal_ex(ctx, outbuf + outlen, &tmplen))
{
/* Error */
return 0;
}
outlen += tmplen;
- EVP_CIPHER_CTX_cleanup(&ctx);
+ EVP_CIPHER_CTX_free(ctx);
/* Need binary mode for fopen because encrypted data is
* binary data. Also cannot use strlen() on it because
* it wont be null terminated and may contain embedded
/* Allow enough space in output buffer for additional block */
unsigned char inbuf[1024], outbuf[1024 + EVP_MAX_BLOCK_LENGTH];
int inlen, outlen;
- EVP_CIPHER_CTX ctx;
+ EVP_CIPHER_CTX *ctx;
/* Bogus key and IV: we'd normally set these from
* another source.
*/
unsigned char iv[] = "1234567887654321";
/* Don't set key or IV right away; we want to check lengths */
- EVP_CIPHER_CTX_init(&ctx);
+ ctx = EVP_CIPHER_CTX_new();
EVP_CipherInit_ex(&ctx, EVP_aes_128_cbc(), NULL, NULL, NULL,
do_encrypt);
- OPENSSL_assert(EVP_CIPHER_CTX_key_length(&ctx) == 16);
- OPENSSL_assert(EVP_CIPHER_CTX_iv_length(&ctx) == 16);
+ OPENSSL_assert(EVP_CIPHER_CTX_key_length(ctx) == 16);
+ OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) == 16);
/* Now we can set key and IV */
- EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, do_encrypt);
+ EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, do_encrypt);
for(;;)
{
inlen = fread(inbuf, 1, 1024, in);
if(inlen <= 0) break;
- if(!EVP_CipherUpdate(&ctx, outbuf, &outlen, inbuf, inlen))
+ if(!EVP_CipherUpdate(ctx, outbuf, &outlen, inbuf, inlen))
{
/* Error */
- EVP_CIPHER_CTX_cleanup(&ctx);
+ EVP_CIPHER_CTX_free(ctx);
return 0;
}
fwrite(outbuf, 1, outlen, out);
}
- if(!EVP_CipherFinal_ex(&ctx, outbuf, &outlen))
+ if(!EVP_CipherFinal_ex(ctx, outbuf, &outlen))
{
/* Error */
- EVP_CIPHER_CTX_cleanup(&ctx);
+ EVP_CIPHER_CTX_free(ctx);
return 0;
}
fwrite(outbuf, 1, outlen, out);
- EVP_CIPHER_CTX_cleanup(&ctx);
+ EVP_CIPHER_CTX_free(ctx);
return 1;
}
=head1 SEE ALSO
-L<evp(3)|evp(3)>
+L<evp(3)>
=head1 HISTORY
-EVP_CIPHER_CTX_init(), EVP_EncryptInit_ex(), EVP_EncryptFinal_ex(),
-EVP_DecryptInit_ex(), EVP_DecryptFinal_ex(), EVP_CipherInit_ex(),
-EVP_CipherFinal_ex() and EVP_CIPHER_CTX_set_padding() appeared in
-OpenSSL 0.9.7.
+Support for OCB mode was added in OpenSSL 1.1.0
-IDEA appeared in OpenSSL 0.9.7 but was often disabled due to
-patent concerns; the last patents expired in 2012.
+B<EVP_CIPHER_CTX> was made opaque in OpenSSL 1.1.0. As a result,
+EVP_CIPHER_CTX_reset() appeared and EVP_CIPHER_CTX_cleanup()
+disappeared. EVP_CIPHER_CTX_init() remains as an alias for
+EVP_CIPHER_CTX_reset().
=cut
projects / openssl.git / blobdiff