diff options
Diffstat (limited to 'src/hmac_md5.c')
| -rw-r--r-- | src/hmac_md5.c | 75 |
1 files changed, 38 insertions, 37 deletions
diff --git a/src/hmac_md5.c b/src/hmac_md5.c index 310f0ef..5c46653 100644 --- a/src/hmac_md5.c +++ b/src/hmac_md5.c @@ -1,7 +1,8 @@ +#include "byte.h" +#include "str.h" + #include "global.h" #include "md5.h" -#include "str.h" -#include "byte.h" /** @file hmac_md5 @@ -13,40 +14,40 @@ output: unsigned char *digest: pointer to calculated digest */ -void hmac_md5(unsigned char *text,int text_len,unsigned char * key,int key_len,unsigned char *digest) +void hmac_md5(unsigned char *text, int text_len, unsigned char *key, int key_len, unsigned char *digest) { - MD5_CTX context; - unsigned char k_ipad[65]; /* inner padding - key XORd with ipad */ - unsigned char k_opad[65]; /* outer padding - key XORd with opad */ - unsigned char tk[16]; - int i; - - if (key_len > 64) { - MD5_CTX tctx; - MD5Init(&tctx); - MD5Update(&tctx,key,key_len); - MD5Final(tk,&tctx); - key = tk; - key_len = 16; - } - - byte_zero(k_ipad,sizeof(k_ipad)); - byte_zero(k_opad,sizeof(k_opad)); - byte_copy(k_ipad,key_len,key); - byte_copy(k_opad,key_len,key); - - for (i = 0; i < 64; i++) { - k_ipad[i] ^= 0x36; - k_opad[i] ^= 0x5c; - } - - MD5Init(&context); /* init context for 1st pass */ - MD5Update(&context,k_ipad,64); /* start with inner pad */ - MD5Update(&context,text,text_len); /* then text of datagram */ - MD5Final(digest,&context); /* finish up 1st pass */ - - MD5Init(&context); /* init context for 2nd pass */ - MD5Update(&context,k_opad,64); /* start with outer pad */ - MD5Update(&context,digest,16); /* then results of 1st hash */ - MD5Final(digest,&context); /* finish up 2nd pass */ + MD5_CTX context; + unsigned char k_ipad[65]; /* inner padding - key XORd with ipad */ + unsigned char k_opad[65]; /* outer padding - key XORd with opad */ + unsigned char tk[16]; + int i; + + if (key_len > 64) { + MD5_CTX tctx; + MD5Init(&tctx); + MD5Update(&tctx, key, key_len); + MD5Final(tk, &tctx); + key = tk; + key_len = 16; + } + + byte_zero(k_ipad, sizeof(k_ipad)); + byte_zero(k_opad, sizeof(k_opad)); + byte_copy(k_ipad, key_len, key); + byte_copy(k_opad, key_len, key); + + for (i = 0; i < 64; i++) { + k_ipad[i] ^= 0x36; + k_opad[i] ^= 0x5c; + } + + MD5Init(&context); /* init context for 1st pass */ + MD5Update(&context, k_ipad, 64); /* start with inner pad */ + MD5Update(&context, text, text_len); /* then text of datagram */ + MD5Final(digest, &context); /* finish up 1st pass */ + + MD5Init(&context); /* init context for 2nd pass */ + MD5Update(&context, k_opad, 64); /* start with outer pad */ + MD5Update(&context, digest, 16); /* then results of 1st hash */ + MD5Final(digest, &context); /* finish up 2nd pass */ } |