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Third Party Openssl
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ec7c9ee8
编写于
3月 02, 2004
作者:
D
Dr. Stephen Henson
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Indent some of the code examples.
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@@ -646,26 +646,26 @@ built OpenSSL with /MD your application must use /MD and cannot use /MDd.
...
@@ -646,26 +646,26 @@ built OpenSSL with /MD your application must use /MD and cannot use /MDd.
* How do I read or write a DER encoded buffer using the ASN1 functions?
* How do I read or write a DER encoded buffer using the ASN1 functions?
You have two options. You can either use a memory BIO in conjunction
You have two options. You can either use a memory BIO in conjunction
with the i2d_
XXX_bio() or d2i_XXX
_bio() functions or you can use the
with the i2d_
*_bio() or d2i_*
_bio() functions or you can use the
i2d_
XXX(), d2i_XXX
() functions directly. Since these are often the
i2d_
*(), d2i_*
() functions directly. Since these are often the
cause of grief here are some code fragments using PKCS7 as an example:
cause of grief here are some code fragments using PKCS7 as an example:
unsigned char *buf, *p;
unsigned char *buf, *p;
int len;
int len;
len = i2d_PKCS7(p7, NULL);
len = i2d_PKCS7(p7, NULL);
buf = OPENSSL_malloc(len); /* or Malloc, error checking omitted */
buf = OPENSSL_malloc(len); /* or Malloc, error checking omitted */
p = buf;
p = buf;
i2d_PKCS7(p7, &p);
i2d_PKCS7(p7, &p);
At this point buf contains the len bytes of the DER encoding of
At this point buf contains the len bytes of the DER encoding of
p7.
p7.
The opposite assumes we already have len bytes in buf:
The opposite assumes we already have len bytes in buf:
unsigned char *p;
unsigned char *p;
p = buf;
p = buf;
p7 = d2i_PKCS7(NULL, &p, len);
p7 = d2i_PKCS7(NULL, &p, len);
At this point p7 contains a valid PKCS7 structure of NULL if an error
At this point p7 contains a valid PKCS7 structure of NULL if an error
occurred. If an error occurred ERR_print_errors(bio) should give more
occurred. If an error occurred ERR_print_errors(bio) should give more
...
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