25     : hash_alg_(hash_alg), plat_(new HMACPlatformData()) {  in HMAC()
31   if (plat_->provider_ || plat_->hkey_) {  in Init()
37   if (!CryptAcquireContext(&plat_->provider_, NULL, NULL,  in Init()
40     plat_->provider_ = NULL;  in Init()
67   if (!CryptImportKey(plat_->provider_, &key_blob_storage[0],  in Init()
69                       &plat_->hkey_)) {  in Init()
71     plat_->hkey_ = NULL;  in Init()
83   if (plat_->hkey_) {  in ~HMAC()
84     ok = CryptDestroyKey(plat_->hkey_);  in ~HMAC()
87   if (plat_->hash_) {  in ~HMAC()
88     ok = CryptDestroyHash(plat_->hash_);  in ~HMAC()
91   if (plat_->provider_) {  in ~HMAC()
92     ok = CryptReleaseContext(plat_->provider_, 0);  in ~HMAC()
100   if (!plat_->provider_ || !plat_->hkey_)  in Sign()
109           plat_->provider_, CALG_HMAC, plat_->hkey_, 0, &plat_->hash_))  in Sign()
115   if (!CryptSetHashParam(plat_->hash_, HP_HMAC_INFO,  in Sign()
119   if (!CryptHashData(plat_->hash_,  in Sign()
125   if (!CryptGetHashParam(plat_->hash_, HP_HASHVAL, digest, &sha1_size, 0))  in Sign()