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Diffstat (limited to 'pjlib-util/src/pjlib-util/hmac_sha1.c')
-rw-r--r--pjlib-util/src/pjlib-util/hmac_sha1.c58
1 files changed, 39 insertions, 19 deletions
diff --git a/pjlib-util/src/pjlib-util/hmac_sha1.c b/pjlib-util/src/pjlib-util/hmac_sha1.c
index 127434b7..b921febc 100644
--- a/pjlib-util/src/pjlib-util/hmac_sha1.c
+++ b/pjlib-util/src/pjlib-util/hmac_sha1.c
@@ -17,19 +17,15 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pjlib-util/hmac_sha1.h>
-#include <pjlib-util/sha1.h>
#include <pj/string.h>
-PJ_DEF(void) pj_hmac_sha1(const pj_uint8_t *input, unsigned input_len,
- const pj_uint8_t *key, unsigned key_len,
- pj_uint8_t digest[20] )
+PJ_DEF(void) pj_hmac_sha1_init(pj_hmac_sha1_context *hctx,
+ const pj_uint8_t *key, unsigned key_len)
{
- pj_sha1_context context;
- pj_uint8_t k_ipad[65];
- pj_uint8_t k_opad[65];
+ pj_uint8_t k_ipad[64];
pj_uint8_t tk[20];
- int i;
+ unsigned i;
/* if key is longer than 64 bytes reset it to key=SHA1(key) */
if (key_len > 64) {
@@ -43,32 +39,56 @@ PJ_DEF(void) pj_hmac_sha1(const pj_uint8_t *input, unsigned input_len,
key_len = 20;
}
+ /*
+ * HMAC = H(K XOR opad, H(K XOR ipad, text))
+ */
+
/* start out by storing key in pads */
pj_bzero( k_ipad, sizeof(k_ipad));
- pj_bzero( k_opad, sizeof(k_opad));
+ pj_bzero( hctx->k_opad, sizeof(hctx->k_opad));
pj_memcpy( k_ipad, key, key_len);
- pj_memcpy( k_opad, key, key_len);
+ pj_memcpy( hctx->k_opad, key, key_len);
/* XOR key with ipad and opad values */
for (i=0; i<64; i++) {
k_ipad[i] ^= 0x36;
- k_opad[i] ^= 0x5c;
+ hctx->k_opad[i] ^= 0x5c;
}
/*
* perform inner SHA1
*/
- pj_sha1_init(&context);
- pj_sha1_update(&context, k_ipad, 64);
- pj_sha1_update(&context, input, input_len);
- pj_sha1_final(&context, digest);
+ pj_sha1_init(&hctx->context);
+ pj_sha1_update(&hctx->context, k_ipad, 64);
+}
+
+PJ_DEF(void) pj_hmac_sha1_update(pj_hmac_sha1_context *hctx,
+ const pj_uint8_t *input, unsigned input_len)
+{
+ pj_sha1_update(&hctx->context, input, input_len);
+}
+
+PJ_DEF(void) pj_hmac_sha1_final(pj_hmac_sha1_context *hctx,
+ pj_uint8_t digest[20])
+{
+ pj_sha1_final(&hctx->context, digest);
/*
* perform outer SHA1
*/
- pj_sha1_init(&context);
- pj_sha1_update(&context, k_opad, 64);
- pj_sha1_update(&context, digest, 20);
- pj_sha1_final(&context, digest);
+ pj_sha1_init(&hctx->context);
+ pj_sha1_update(&hctx->context, hctx->k_opad, 64);
+ pj_sha1_update(&hctx->context, digest, 20);
+ pj_sha1_final(&hctx->context, digest);
}
+PJ_DEF(void) pj_hmac_sha1(const pj_uint8_t *input, unsigned input_len,
+ const pj_uint8_t *key, unsigned key_len,
+ pj_uint8_t digest[20] )
+{
+ pj_hmac_sha1_context ctx;
+
+ pj_hmac_sha1_init(&ctx, key, key_len);
+ pj_hmac_sha1_update(&ctx, input, input_len);
+ pj_hmac_sha1_final(&ctx, digest);
+}