Diff: hash.cpp

Revision:

0:7ddb56bfde0c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hash.cpp	Wed Mar 23 19:53:42 2011 +0000
@@ -0,0 +1,56 @@
+
+#include "oauth.h" // base64 encode fn's.
+#include "sha1.h"
+
+#include <string.h>
+
+void hmac_sha1(unsigned char const *key, size_t keylen, unsigned char const *in, size_t inlen, unsigned char *resbuf)
+{
+    struct SHA1Context inner;
+    struct SHA1Context outer;
+    unsigned char tmpkey[20];
+    unsigned char digest[20];
+    unsigned char block[64];
+
+    const int IPAD = 0x36;
+    const int OPAD = 0x5c;
+
+    if (keylen > 64) {
+        struct SHA1Context keyhash;
+        SHA1Reset(&keyhash);
+        SHA1Input(&keyhash, key, keylen);
+        SHA1Result(&keyhash, tmpkey);
+        key = tmpkey;
+        keylen = 20;
+    }
+
+    for (size_t i = 0; i < sizeof(block); i++) {
+        block[i] = IPAD ^ (i < keylen ? key[i] : 0);
+    }
+    SHA1Reset(&inner);
+    SHA1Input(&inner, block, 64);
+    SHA1Input(&inner, in, inlen);
+    SHA1Result(&inner, digest);
+
+    for (size_t i = 0; i < sizeof(block); i++) {
+        block[i] = OPAD ^ (i < keylen ? key[i] : 0);
+    }
+    SHA1Reset(&outer);
+    SHA1Input(&outer, block, 64);
+    SHA1Input(&outer, digest, 20);
+    SHA1Result(&outer, resbuf);
+}
+
+
+std::string oauth_sign_hmac_sha1(const char *m, const char *k)
+{
+    return oauth_sign_hmac_sha1_raw(m, strlen(m), k, strlen(k));
+}
+
+std::string oauth_sign_hmac_sha1_raw(const char *m, const size_t ml, const char *k, const size_t kl)
+{
+    unsigned char result[20];
+    hmac_sha1((unsigned char const *)k, kl, (unsigned char const *)m, ml, result);
+    return oauth_encode_base64(result, 20);
+}
+