Re : Default digest implementation?
Hi,
Actually, there's no default digest.
When created, the EVP_MD_CTX struct is initialized to 0, then all pointers are
NULL by default, in particular ctx-type.
If a a digest was previously used, it can be reused if no EVP_MD is given,
otherwise the initialization will fail.
Concerning engine, they work as blackboxes for an algorithm implementation,
then their type depend on the algorithm.
MD2 is just not included at compilation
- Mail d'origine -
De: Jeffrey Walton noloa...@gmail.com
À: OpenSSL Users List openssl-users@openssl.org
Envoyé: Fri, 18 Jul 2014 06:04:17 +0200 (CEST)
Objet: Default digest implementation?
https://www.openssl.org/docs/crypto/EVP_DigestInit.html
The doc states the default default digest implementation is used if
'impl' is NULL. The docs also state OpenSSL 1.0 and later does not
include the MD2 digest algorithm in the default configuration
I found the call to EVP_DigestInit which calls EVP_DigestInit_ex. But
I'm getting lost in EVP_DigestInit_ex:
if(impl)
{
...
}
else
{
/* Ask if an ENGINE is reserved for this job */
impl = ENGINE_get_digest_engine(type-type);
}
I'm having trouble tracking down 'type' used by ENGINE_get_digest_engine.
What is the default digest implementation for 1.0 and later? Or where
can I find the source file that sets the default?
__
OpenSSL Project http://www.openssl.org
User Support Mailing Listopenssl-users@openssl.org
Automated List Manager majord...@openssl.org
__
OpenSSL Project http://www.openssl.org
User Support Mailing Listopenssl-users@openssl.org
Automated List Manager majord...@openssl.org
Re: Re : Default digest implementation?
On Fri, Jul 18, 2014 at 3:02 AM, nicolas@free.fr wrote:
Actually, there's no default digest.
When created, the EVP_MD_CTX struct is initialized to 0, then all pointers
are NULL by default, in particular ctx-type.
If a a digest was previously used, it can be reused if no EVP_MD is given,
otherwise the initialization will fail.
Hmmm... something does not sound correct.
I was tracing in the context of md_rand (crypto/rand/md_rand.c). When
ssleay_rand_add() or ssleay_rand_bytes() is called, md_rand is mixing
with something. Its clearly not setting `m` to something like
EVP_md5(); rather its using the default implementation discussed in
the docs.
Jeff
- Mail d'origine -
De: Jeffrey Walton noloa...@gmail.com
À: OpenSSL Users List openssl-users@openssl.org
Envoyé: Fri, 18 Jul 2014 06:04:17 +0200 (CEST)
Objet: Default digest implementation?
https://www.openssl.org/docs/crypto/EVP_DigestInit.html
The doc states the default default digest implementation is used if
'impl' is NULL. The docs also state OpenSSL 1.0 and later does not
include the MD2 digest algorithm in the default configuration
I found the call to EVP_DigestInit which calls EVP_DigestInit_ex. But
I'm getting lost in EVP_DigestInit_ex:
if(impl)
{
...
}
else
{
/* Ask if an ENGINE is reserved for this job */
impl = ENGINE_get_digest_engine(type-type);
}
I'm having trouble tracking down 'type' used by ENGINE_get_digest_engine.
What is the default digest implementation for 1.0 and later? Or where
can I find the source file that sets the default?
__
OpenSSL Project http://www.openssl.org
User Support Mailing Listopenssl-users@openssl.org
Automated List Manager majord...@openssl.org
Re : Re: Re : Default digest implementation?
that's why :
#define MD_Init(a) EVP_DigestInit_ex(a,EVP_md5(), NULL)
in
if (!MD_Init(m))
goto err;
if (!MD_Update(m,local_md,MD_DIGEST_LENGTH))
goto err;
- Mail d'origine -
De: Jeffrey Walton noloa...@gmail.com
À: OpenSSL Users List openssl-users@openssl.org
Envoyé: Fri, 18 Jul 2014 09:32:09 +0200 (CEST)
Objet: Re: Re : Default digest implementation?
On Fri, Jul 18, 2014 at 3:02 AM, nicolas@free.fr wrote:
Actually, there's no default digest.
When created, the EVP_MD_CTX struct is initialized to 0, then all pointers
are NULL by default, in particular ctx-type.
If a a digest was previously used, it can be reused if no EVP_MD is given,
otherwise the initialization will fail.
Hmmm... something does not sound correct.
I was tracing in the context of md_rand (crypto/rand/md_rand.c). When
ssleay_rand_add() or ssleay_rand_bytes() is called, md_rand is mixing
with something. Its clearly not setting `m` to something like
EVP_md5(); rather its using the default implementation discussed in
the docs.
Jeff
- Mail d'origine -
De: Jeffrey Walton noloa...@gmail.com
À: OpenSSL Users List openssl-users@openssl.org
Envoyé: Fri, 18 Jul 2014 06:04:17 +0200 (CEST)
Objet: Default digest implementation?
https://www.openssl.org/docs/crypto/EVP_DigestInit.html
The doc states the default default digest implementation is used if
'impl' is NULL. The docs also state OpenSSL 1.0 and later does not
include the MD2 digest algorithm in the default configuration
I found the call to EVP_DigestInit which calls EVP_DigestInit_ex. But
I'm getting lost in EVP_DigestInit_ex:
if(impl)
{
...
}
else
{
/* Ask if an ENGINE is reserved for this job */
impl = ENGINE_get_digest_engine(type-type);
}
I'm having trouble tracking down 'type' used by ENGINE_get_digest_engine.
What is the default digest implementation for 1.0 and later? Or where
can I find the source file that sets the default?
__
OpenSSL Project http://www.openssl.org
User Support Mailing Listopenssl-users@openssl.org
Automated List Manager majord...@openssl.org
__
OpenSSL Project http://www.openssl.org
User Support Mailing Listopenssl-users@openssl.org
Automated List Manager majord...@openssl.org
Re : Re: Re : Default digest implementation?
that's why :
in crypto/rand/rand_lcl.h
--
#elif defined(USE_SHA1_RAND)
#include openssl/sha.h
#define MD_DIGEST_LENGTHSHA_DIGEST_LENGTH
#define MD_Init(a) EVP_DigestInit_ex(a,EVP_sha1(), NULL)
#define MD(a,b,c) EVP_Digest(a,b,c,NULL,EVP_sha1(), NULL)
--
then in crypto/rand/md_rand.c
if (!MD_Init(m))
goto err;
if (!MD_Update(m,local_md,MD_DIGEST_LENGTH))
goto err;
- Mail d'origine -
De: Jeffrey Walton noloa...@gmail.com
À: OpenSSL Users List openssl-users@openssl.org
Envoyé: Fri, 18 Jul 2014 09:32:09 +0200 (CEST)
Objet: Re: Re : Default digest implementation?
On Fri, Jul 18, 2014 at 3:02 AM, nicolas@free.fr wrote:
Actually, there's no default digest.
When created, the EVP_MD_CTX struct is initialized to 0, then all pointers
are NULL by default, in particular ctx-type.
If a a digest was previously used, it can be reused if no EVP_MD is given,
otherwise the initialization will fail.
Hmmm... something does not sound correct.
I was tracing in the context of md_rand (crypto/rand/md_rand.c). When
ssleay_rand_add() or ssleay_rand_bytes() is called, md_rand is mixing
with something. Its clearly not setting `m` to something like
EVP_md5(); rather its using the default implementation discussed in
the docs.
Jeff
- Mail d'origine -
De: Jeffrey Walton noloa...@gmail.com
À: OpenSSL Users List openssl-users@openssl.org
Envoyé: Fri, 18 Jul 2014 06:04:17 +0200 (CEST)
Objet: Default digest implementation?
https://www.openssl.org/docs/crypto/EVP_DigestInit.html
The doc states the default default digest implementation is used if
'impl' is NULL. The docs also state OpenSSL 1.0 and later does not
include the MD2 digest algorithm in the default configuration
I found the call to EVP_DigestInit which calls EVP_DigestInit_ex. But
I'm getting lost in EVP_DigestInit_ex:
if(impl)
{
...
}
else
{
/* Ask if an ENGINE is reserved for this job */
impl = ENGINE_get_digest_engine(type-type);
}
I'm having trouble tracking down 'type' used by ENGINE_get_digest_engine.
What is the default digest implementation for 1.0 and later? Or where
can I find the source file that sets the default?
__
OpenSSL Project http://www.openssl.org
User Support Mailing Listopenssl-users@openssl.org
Automated List Manager majord...@openssl.org
__
OpenSSL Project http://www.openssl.org
User Support Mailing Listopenssl-users@openssl.org
Automated List Manager majord...@openssl.org
Default digest implementation?
https://www.openssl.org/docs/crypto/EVP_DigestInit.html
The doc states the default default digest implementation is used if
'impl' is NULL. The docs also state OpenSSL 1.0 and later does not
include the MD2 digest algorithm in the default configuration
I found the call to EVP_DigestInit which calls EVP_DigestInit_ex. But
I'm getting lost in EVP_DigestInit_ex:
if(impl)
{
...
}
else
{
/* Ask if an ENGINE is reserved for this job */
impl = ENGINE_get_digest_engine(type-type);
}
I'm having trouble tracking down 'type' used by ENGINE_get_digest_engine.
What is the default digest implementation for 1.0 and later? Or where
can I find the source file that sets the default?
__
OpenSSL Project http://www.openssl.org
User Support Mailing Listopenssl-users@openssl.org
Automated List Manager majord...@openssl.org
