OAuth library for twitter. Original: http://mbed.org/users/soramimi/programs/Twitter/
hash.cpp
- Committer:
- takahashim
- Date:
- 2011-12-12
- Revision:
- 0:0048b264a3ad
File content as of revision 0:0048b264a3ad:
#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); }