ref: 3f22e19560bfcac978bbbcdd20a55464755e10cf
dir: /libsec/hmac.c/
#include "os.h" #include <libsec.h> /* rfc2104 */ static DigestState* hmac_x(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s, DigestState*(*x)(uchar*, ulong, uchar*, DigestState*), int xlen) { int i; uchar pad[65], innerdigest[256]; if(xlen > sizeof(innerdigest)) return nil; if(klen>64) return nil; /* first time through */ if(s == nil){ for(i=0; i<64; i++) pad[i] = 0x36; pad[64] = 0; for(i=0; i<klen; i++) pad[i] ^= key[i]; s = (*x)(pad, 64, nil, nil); if(s == nil) return nil; } s = (*x)(p, len, nil, s); if(digest == nil) return s; /* last time through */ for(i=0; i<64; i++) pad[i] = 0x5c; pad[64] = 0; for(i=0; i<klen; i++) pad[i] ^= key[i]; (*x)(nil, 0, innerdigest, s); s = (*x)(pad, 64, nil, nil); (*x)(innerdigest, xlen, digest, s); return nil; } DigestState* hmac_sha1(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s) { return hmac_x(p, len, key, klen, digest, s, sha1, SHA1dlen); } DigestState* hmac_md5(uchar *p, ulong len, uchar *key, ulong klen, uchar *digest, DigestState *s) { return hmac_x(p, len, key, klen, digest, s, md5, MD5dlen); }