Creating Key using HMAC - SHA1 using openSSL

[Bhavesh.Feb@gmail.com]

Hi,
I'm trying to use SHA1 and HMAC to create signature for my web
service request. I dont know much about HMAC or SHA1 but this is what i
need to create signature. What i'm trying to do is:

SHA_CTX shaContext;
SHA1_Init(&shaC ontext);
SHA1_Update(&sh aContext, &data, dataLen );
SHA1_Final(ciph er_key, &shaContext) ;

char out[EVP_MAX_MD_SIZE]; // EVP_MAX_MD_SIZE is the limit on
int len; // what HMAC will ever put in out
HMAC(
sha1(),
secretKey,
strlen(secretKe y),
data.c_str(),
dataLen,
out,
&len
);

It's throwing some compilation error for call to HMAC as i'm not
passing correct parameter to it.

Does someone already implemented this???? Can someone share working
code snippet?

Thanks,
Bhavesh

[Bhavesh.Feb@gmail.com]

Re: Creating Key using HMAC - SHA1 using openSSL

I'm working on unix and am using opneSSL libraries.

Bhavesh.Feb@gma il.com wrote:

Hi,
I'm trying to use SHA1 and HMAC to create signature for my web
service request. I dont know much about HMAC or SHA1 but this is what i
need to create signature. What i'm trying to do is:
>
SHA_CTX shaContext;
SHA1_Init(&shaC ontext);
SHA1_Update(&sh aContext, &data, dataLen );
SHA1_Final(ciph er_key, &shaContext) ;
>
char out[EVP_MAX_MD_SIZE]; // EVP_MAX_MD_SIZE is the limit on
int len; // what HMAC will ever put in out
HMAC(
sha1(),
secretKey,
strlen(secretKe y),
data.c_str(),
dataLen,
out,
&len
);
>
It's throwing some compilation error for call to HMAC as i'm not
passing correct parameter to it.
>
Does someone already implemented this???? Can someone share working
code snippet?
>
Thanks,
Bhavesh

[David Harmon]

Re: Creating Key using HMAC - SHA1 using openSSL

On 22 Sep 2006 14:52:57 -0700 in comp.lang.c++,
Bhavesh.Feb@gma il.com wrote,

It's throwing some compilation error for call to HMAC as i'm not
>passing correct parameter to it.

No fair asking about an error message without telling us what it
says!

[red floyd]

Re: Creating Key using HMAC - SHA1 using openSSL

David Harmon wrote:

On 22 Sep 2006 14:52:57 -0700 in comp.lang.c++,
Bhavesh.Feb@gma il.com wrote,

> It's throwing some compilation error for call to HMAC as i'm not
>passing correct parameter to it.

>
No fair asking about an error message without telling us what it
says!
>

He has an error on line 42 of his code.

[Thomas J. Gritzan]

Re: Creating Key using HMAC - SHA1 using openSSL

Bhavesh.Feb@gma il.com schrieb:

I'm trying to use SHA1 and HMAC to create signature for my web
service request. I dont know much about HMAC or SHA1 but this is what i
need to create signature. What i'm trying to do is:
>
SHA_CTX shaContext;
SHA1_Init(&shaC ontext);
SHA1_Update(&sh aContext, &data, dataLen );
SHA1_Final(ciph er_key, &shaContext) ;
>
char out[EVP_MAX_MD_SIZE]; // EVP_MAX_MD_SIZE is the limit on
int len; // what HMAC will ever put in out
HMAC(
sha1(),
secretKey,
strlen(secretKe y),
data.c_str(),
dataLen,
out,
&len
);

http://www.die.net/doc/linux/man/man3/hmac.3.html

Seems like you pass an int* where an unsigned int* is needed, and char*
where unsigned char*...
well, giving us the error messages would help, but asking in a newsgroup
where this library is on-topic would be even better. Try a unix programming
newsgroup.

See here:

http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.8

and here:

http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.9

--
Thomas

http://www.netmeister.org/news/learn2quote.html