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copied!<p>The code below is from the OP. Originally, the post contained both the question and the answer and I am turning it into a Q&A format.</p> <p>The signature has to be of the format</p> <pre><code>base64encode((HMAC-SHA1(ActionName+"AmazonS3"+XMLTimestamp))) </code></pre> <p>The HMAC, SHA1and B64 utils are available in <a href="http://www.openssl.org" rel="nofollow">openssl</a>.</p> <p>The format for SOAP requests is given by the <a href="http://doc.s3.amazonaws.com/2006-03-01/AmazonS3.wsdl" rel="nofollow">wsdl</a>.</p> <p>The REST interface is different.</p> <p>After <code>wsdl2h</code> to generate the header and soapcpp2 to generate the GSOAP client code the following will be the code to access the service:</p> <p>Requirements : <a href="http://www.openssl.org/" rel="nofollow">OpenSSL</a>, <a href="http://gsoap2.sourceforge.net/" rel="nofollow">GSOAP</a>.</p> <p>Build with the compiler preprocessor directive <code>WITH_OPENSSL</code>. Link with libraries <code>libeay32</code> and <code>ssleay32</code>.</p> <pre><code>#include "AmazonS3SoapBinding.nsmap" //generated from soapcpp2 #include "soapAmazonS3SoapBindingProxy.h" //generated from soapcpp2 #include <stdio.h> #include <string.h> #include <stdarg.h> #include <openssl/sha.h> #include <openssl/hmac.h> #include <openssl/evp.h> /* convert to base64 */ std::string base64_encodestring(char* text, int len) { EVP_ENCODE_CTX ectx; int size = len*2; size = size > 64 ? size : 64; unsigned char* out = (unsigned char*)malloc( size ); int outlen = 0; int tlen = 0; EVP_EncodeInit(&ectx); EVP_EncodeUpdate(&ectx, out, &outlen, (const unsigned char*)text, len ); tlen += outlen; EVP_EncodeFinal( &ectx, out+tlen, &outlen ); tlen += outlen; std::string str((char*)out, tlen ); free( out ); return str; } /* return the utc date+time in xml format */ const char* xml_datetime() { /*"YYYY-mm-ddTHH:MM:SS.000Z\"*/ const int MAX=25; static char output[MAX+1]; time_t now = time(NULL); strftime( output, MAX+1, "%Y-%m-%dT%H:%M:%S.000Z", gmtime( &now ) ); std::cout <<output<<std::endl; return output; } /* first argument is the signing key */ /* all subsequent argumets are concatenated */ /* must end list with NULL */ char* aws_signature(char* key, ...) { unsigned int i, len; char *data, **list = &key; static char hmac[EVP_MAX_MD_SIZE]; for (i = 1, len = 0; *(list+i) != NULL; ++i) { len += strlen( *(list+i) ); } data = (char*)malloc(sizeof(char) * (len+1)); if (data) { for ( i = 1, len = 0 ; *(list+i) != NULL ; ++i ) { strncpy( data+len, *(list+i), strlen(*(list+i)) ); len += strlen(*(list+i)); } data[len]='\0'; std::cout<<data<<std::endl; HMAC( EVP_sha1(), key, strlen(key), (unsigned char*)data, strlen(data), (unsigned char*) hmac, &len ); free(data); } std::string b64data=base64_encodestring(hmac, len); strcpy(hmac,b64data.c_str()); return hmac; }; int main(void) { AmazonS3SoapBindingProxy client; soap_ssl_client_context(&client, /* for encryption w/o authentication */ SOAP_SSL_NO_AUTHENTICATION, /* SOAP_SSL_DEFAULT | SOAP_SSL_SKIP_HOST_CHECK, */ /* if we don't want the host name checks since * these will change from machine to machine */ /*SOAP_SSL_DEFAULT,*/ /* use SOAP_SSL_DEFAULT in production code */ NULL, /* keyfile (cert+key): required only when client must authenticate to server (see SSL docs to create this file) */ NULL, /* password to read the keyfile */ NULL, /* optional cacert file to store trusted certificates, use cacerts.pem for all public certificates issued by common CAs */ NULL, /* optional capath to directory with trusted certificates */ NULL /* if randfile!=NULL: use a file with random data to seed randomness */ ); /* use this if you are behind a proxy server..... client.proxy_host="proxyserver"; // proxy hostname client.proxy_port=4250; client.proxy_userid="username"; // user pass if proxy client.proxy_passwd="password"; // requires authentication client.proxy_http_version="1.1"; // http version */ _ns1__ListAllMyBuckets buk_req; _ns1__ListAllMyBucketsResponse buk_resp; ns1__ListAllMyBucketsResult buk_res; buk_res.soap=&client; buk_req.AWSAccessKeyId=new std::string("ACCESSKEY"); buk_req.soap=&client; /* ListAllMyBuckets is the method I want to call here. * change it for other S3 services that you wish to call.*/ char *sig=aws_signature( "SECRETKEY", "AmazonS3", "ListAllMyBuckets", xml_datetime(), NULL ); buk_req.Signature=new std::string(sig); buk_req.Timestamp=new time_t(time(NULL)); buk_resp.soap=&client; buk_resp.ListAllMyBucketsResponse=&buk_res; client.ListAllMyBuckets(&buk_req,&buk_resp); client.soap_stream_fault(std::cout); std::vector<ns1__ListAllMyBucketsEntry * >::iterator itr; for(itr=buk_resp.ListAllMyBucketsResponse->Buckets->Bucket.begin(); itr!=buk_resp.ListAllMyBucketsResponse->Buckets->Bucket.end(); itr++ ) { std::cout<<(*itr)->Name<<std::endl; } } </code></pre>

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