Oh.. I've been away from this for a while. So, I didn't check email from
OpenSSL.
By the way, i would like to appreciate your kindness of providing some
sample code. :)
JongAm Park
Reid Thompson wrote:
JongAm Park wrote:
Hello.
Thank you for mentioning the book.
However, I could figure out by staring at its MAN page long time and
looking up some sample codes in source code distribution of the OpenSSL.
However, it would be great if there is a good reference/tutorial
book. :)
went ahead and made that minor change
$ cat openssl_EVP_example.c
/*
* Compilation
* $ gcc -lssl openssl_EVP_example.c
*
* $ ./a.out sha256
*
* Multiple String Digest is:
e31318725541062f35791d14a9c63c30faed0896609527c108b511b65d6e1fdd
* Single String Digest is:
e31318725541062f35791d14a9c63c30faed0896609527c108b511b65d6e1fdd
*
*/
#include <stdio.h>
#include <string.h>
#include <openssl/evp.h>
static int encode_buffer_append_test( char **argv);
static int encode_buffer_test(char **argv);
main(int argc, char *argv[])
{
/*
* MODIFICATIONS REQUIRED FOR PRODUCTION USE
* CHECK RETURN CODES ETC
*/
/* buffer append encode example */
(void)encode_buffer_append_test(argv);
/* buffer encode example */
(void)encode_buffer_test(argv);
}
static int encode_buffer_append_test(char **argv)
{
EVP_MD_CTX mdctx;
const EVP_MD *md;
char mess1[] = "Test Message";
char mess2[] = "Hello World";
unsigned char md_value[EVP_MAX_MD_SIZE];
int md_len, i;
OpenSSL_add_all_digests();
if(!argv[1])
{
printf("Usage: mdtest digestname\n");
exit(1);
}
md = EVP_get_digestbyname(argv[1]);
if(!md)
{
printf("Unknown message digest %s\n", argv[1]);
exit(1);
}
EVP_MD_CTX_init(&mdctx);
EVP_DigestInit_ex(&mdctx, md, NULL);
EVP_DigestUpdate(&mdctx, mess1, strlen(mess1));
EVP_DigestUpdate(&mdctx, mess2, strlen(mess2));
EVP_DigestFinal_ex(&mdctx, md_value, &md_len);
EVP_MD_CTX_cleanup(&mdctx);
printf("Multiple String Digest is: ");
for(i = 0; i < md_len; i++)
{
printf("%02x", md_value[i]);
}
printf("\n");
return 0;
}
static int encode_buffer_test(char **argv)
{
int hashsz = 0;
int i = 0;
unsigned char digest[EVP_MAX_MD_SIZE] =
{0xf5, 0x53, 0xcd, 0xb8, 0xcf, 0x1, 0xee, 0x17, 0x9b, 0x93, 0xc9,
0x68, 0xc0, 0xea, 0x40, 0x91,
0x6, 0xec, 0x8e, 0x11, 0x96, 0xc8, 0x5d, 0x1c, 0xaf, 0x64, 0x22, 0xe6,
0x50, 0x4f, 0x47, 0x57};
unsigned char str[] = "Test MessageHello World";
unsigned char md[EVP_MAX_MD_SIZE];
/* int EVP_Digest (const void *data, size_t count, unsigned char *md,
unsigned int *size, const EVP_MD *type, ENGINE *impl)
* Parameters:
* data the data to update the context with
* dsize length of data
* hash output data of at least EVP_MD_size() length.
* hsize output length of hash.
* md message digest to use
* engine engine to use, NULL for default engine.
*
* Returns:
* 1 on success.
* */
ERR_clear_error();
/* if (!EVP_Digest(str, sizeof(str) - 1, md, &hashsz, EVP_sha256(),
NULL)) */
if (!EVP_Digest(str, sizeof(str) - 1, md, &hashsz,
EVP_get_digestbyname(argv[1]), NULL))
{
printf("failed\n");
return 0;
}
if (memcmp(md, digest, sizeof(md)))
{
printf("Single String Digest is: ");
for(i = 0; i < hashsz; i++)
{
printf("%02x", md[i]);
}
printf("\n");
return 0;
}
else
{
printf("memcmp failed/digest doesn't match expected\n");
return 1;
}
}
______________________________________________________________________
OpenSSL Project http://www.openssl.org
User Support Mailing List openssl-users@openssl.org
Automated List Manager majord...@openssl.org
--
--
子曰 不而不改 是謂過矣니라
공자께서 말씀하시길, 잘못을 하고도 고치지 않는 것, 그것을 잘못이라 한다.
- 論語 < 衛 靈 公 >편
JongAm Park
jongamp...@sbcglobal.net
Visit my personal blog at http://jongampark.blogspot.com
Visit my technical blog at http://jongampark.wordpress.com
______________________________________________________________________
OpenSSL Project http://www.openssl.org
User Support Mailing List openssl-users@openssl.org
Automated List Manager majord...@openssl.org
