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RT2210: Add missing EVP_cleanup to example

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I also removed some trailing whitespace and cleaned
up the "see also" list.

Reviewed-by: Emilia Kasper <emilia@openssl.org>
(cherry picked from commit 7b3e11c544)
This commit is contained in:
Mihai Militaru 2014-08-26 12:35:54 -04:00 committed by Rich Salz
parent 8f5f782253
commit 48ecdec7a0
1 changed files with 17 additions and 13 deletions
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30
doc/crypto/EVP_DigestInit.pod
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@ -26,13 +26,13 @@ EVP digest routines
int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx);
void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx);
int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out,const EVP_MD_CTX *in);
int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out,const EVP_MD_CTX *in);
int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type);
int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md,
unsigned int *s);
int EVP_MD_CTX_copy(EVP_MD_CTX *out,EVP_MD_CTX *in);
int EVP_MD_CTX_copy(EVP_MD_CTX *out,EVP_MD_CTX *in);
#define EVP_MAX_MD_SIZE 64 /* SHA512 */
@ -136,10 +136,10 @@ reasons.
EVP_md2(), EVP_md5(), EVP_sha(), EVP_sha1(), EVP_sha224(), EVP_sha256(),
EVP_sha384(), EVP_sha512(), EVP_mdc2() and EVP_ripemd160() return B<EVP_MD>
structures for the MD2, MD5, SHA, SHA1, SHA224, SHA256, SHA384, SHA512, MDC2
and RIPEMD160 digest algorithms respectively.
and RIPEMD160 digest algorithms respectively.
EVP_dss() and EVP_dss1() return B<EVP_MD> structures for SHA and SHA1 digest
algorithms but using DSS (DSA) for the signature algorithm. Note: there is
algorithms but using DSS (DSA) for the signature algorithm. Note: there is
no need to use these pseudo-digests in OpenSSL 1.0.0 and later, they are
however retained for compatibility.
@ -177,21 +177,21 @@ The B<EVP> interface to message digests should almost always be used in
preference to the low level interfaces. This is because the code then becomes
transparent to the digest used and much more flexible.
New applications should use the SHA2 digest algorithms such as SHA256.
New applications should use the SHA2 digest algorithms such as SHA256.
The other digest algorithms are still in common use.
For most applications the B<impl> parameter to EVP_DigestInit_ex() will be
set to NULL to use the default digest implementation.
The functions EVP_DigestInit(), EVP_DigestFinal() and EVP_MD_CTX_copy() are
The functions EVP_DigestInit(), EVP_DigestFinal() and EVP_MD_CTX_copy() are
obsolete but are retained to maintain compatibility with existing code. New
applications should use EVP_DigestInit_ex(), EVP_DigestFinal_ex() and
applications should use EVP_DigestInit_ex(), EVP_DigestFinal_ex() and
EVP_MD_CTX_copy_ex() because they can efficiently reuse a digest context
instead of initializing and cleaning it up on each call and allow non default
implementations of digests to be specified.
In OpenSSL 0.9.7 and later if digest contexts are not cleaned up after use
memory leaks will occur.
memory leaks will occur.
Stack allocation of EVP_MD_CTX structures is common, for example:
@ -245,15 +245,19 @@ digest name passed on the command line.
EVP_MD_CTX_destroy(mdctx);
printf("Digest is: ");
for(i = 0; i < md_len; i++) printf("%02x", md_value[i]);
for(i = 0; i < md_len; i++)
printf("%02x", md_value[i]);
printf("\n");
/* Call this once before exit. */
EVP_cleanup();
exit(0);
}
=head1 SEE ALSO
L<evp(3)|evp(3)>, L<hmac(3)|hmac(3)>, L<md2(3)|md2(3)>,
L<md5(3)|md5(3)>, L<mdc2(3)|mdc2(3)>, L<ripemd(3)|ripemd(3)>,
L<sha(3)|sha(3)>, L<dgst(1)|dgst(1)>
L<dgst(1)|dgst(1)>,
L<evp(3)|evp(3)>
=head1 HISTORY
@ -269,7 +273,7 @@ EVP_dss(), EVP_dss1(), EVP_mdc2() and EVP_ripemd160() were
changed to return truely const EVP_MD * in OpenSSL 0.9.7.
The link between digests and signing algorithms was fixed in OpenSSL 1.0 and
later, so now EVP_sha1() can be used with RSA and DSA, there is no need to
later, so now EVP_sha1() can be used with RSA and DSA; there is no need to
use EVP_dss1() any more.
OpenSSL 1.0 and later does not include the MD2 digest algorithm in the