brush up

.vscode/settings.json

@@ -2,6 +2,7 @@
     "files.associations": {
         "sha256.h": "c",
         "stdlib.h": "c",
-        "errno.h": "c"
+        "errno.h": "c",
+        "functional": "cpp"
     }
 }

README.md

@@ -10,7 +10,7 @@ Cryptocurrency hashing functions for node.js.
 
 Algorithms
 ----------
-Supported algorithms: `quark, x11, x13, x16r, x16rv2, nist5, scrypt, scryptn, scryptjane, keccak, bcrypt, skein, groestl, blake, fugue, qubit, hefty1, shavite3, cryptonight, boolberry, sha256d, lbry, kawpaw, allium, hsr, lyra2re2, m7, minotaur, odo, phi1612, skunk, skydoge, tribus, x17, x25x, yescrypt, yespower`, *__and more!__*
+Supported algorithms: `quark, x11, x13, x16r, x16rv2, nist5, scrypt, scryptn, scryptjane, keccak, bcrypt, skein, groestl, blake, fugue, qubit, hefty1, shavite3, cryptonight, boolberry, sha256d, lbry, kawpaw, allium, blake2s, gost, hsr, lyra2re2, lyra2z, m7, m7m, minotaur, odo, phi1612, sha1, skunk, skydoge, tribus, whirlpoolx, x17, x25x, xevan, zr5, yescrypt, yespower`, *__and more!__*
 
 
 Usage

src/crypto/sha256.h

@@ -89,6 +89,36 @@ typedef struct HMAC_SHA256Context {
 	sha256_ctx octx;
 } hmac_sha256_ctx;
 
+/**
+ * SHA256_Buf(in, len, digest):
+ * Compute the SHA256 hash of ${len} bytes from ${in} and write it to ${digest}.
+ */
+static void
+sha256_buf(const void* in, size_t len, uint8_t digest[32])
+{
+	sha256_ctx ctx;
+
+	sha256_init(&ctx);
+	sha256_update(&ctx, in, len);
+	sha256_final(digest, &ctx);
+}
+
+/**
+ * HMAC_SHA256_Buf(K, Klen, in, len, digest):
+ * Compute the HMAC-SHA256 of ${len} bytes from ${in} using the key ${K} of
+ * length ${Klen}, and write the result to ${digest}.
+ */
+static void
+hmac_sha256_buf(const void* K, size_t Klen, const void* in, size_t len,
+	uint8_t digest[32])
+{
+	hmac_sha256_ctx ctx;
+
+	hmac_sha256_init(&ctx, K, Klen);
+	hmac_sha256_update(&ctx, in, len);
+	hmac_sha256_final(digest, &ctx);
+}
+
 void	sha256_init(sha256_ctx *);
 void	sha256_update(sha256_ctx *, const void *, size_t);
 void	sha256_final(unsigned char [32], sha256_ctx *);