1 files changed, 61 insertions, 0 deletions
diff --git a/libscrypt.h b/libscrypt.h
new file mode 100644
index 0000000..b244d8d
--- /dev/null
+++ b/libscrypt.h
@@ -0,0 +1,61 @@
+/*-
+ */
+#ifndef _CRYPTO_SCRYPT_H_
+#define _CRYPTO_SCRYPT_H_
+
+
+#include <stdint.h>
+
+/**
+ * crypto_scrypt(passwd, passwdlen, salt, saltlen, N, r, p, buf, buflen):
+ * Compute scrypt(passwd[0 .. passwdlen - 1], salt[0 .. saltlen - 1], N, r,
+ * p, buflen) and write the result into buf.  The parameters r, p, and buflen
+ * must satisfy r * p < 2^30 and buflen <= (2^32 - 1) * 32.  The parameter N
+ * must be a power of 2 greater than 1.
+ *
+ * libscrypt_scrypt(passwd, passwdlen, salt, saltlen, N, r, p, buf, buflen):
+ * password; duh
+ * N: CPU AND RAM cost (first modifier)
+ * r: RAM Cost
+ * p: CPU cost (parallelisation)
+ * In short, N is your main performance modifier. Values of r = 8, p = 1 are
+ * standard unless you want to modify the CPU/RAM ratio.
+ * Return 0 on success; or -1 on error.
+ */
+int libscrypt_scrypt(const uint8_t *, size_t, const uint8_t *, size_t, uint64_t,
+    uint32_t, uint32_t, /*@out@*/ uint8_t *, size_t);
+
+/**
+ * Converts a binary string to a hex representation of that string
+ * outbuf must have size of at least buf * 2 + 1.
+ */
+int libscrypt_hexconvert(uint8_t *buf, size_t s, char *outbuf, size_t obs);
+
+/* Converts a series of input parameters to a MCF form for storage */
+int libscrypt_mcf(uint32_t N, uint32_t r, uint32_t p, char *salt, char *hash, char *mcf);
+
+/* Generates a salt. This is not a cryptographically unpredictable function,
+ * but should produce appropriately randomised output for this purpose
+ */
+void libscrypt_salt_gen(/*@out@*/ char *rand, size_t len);
+
+/* Checks a given MCF against a password */
+int libscrypt_check(char *mcf, char *password);
+
+/* Creates a hash of a passphrase using a randomly generated salt */
+int libscrypt_hash(char *dst, char* passphrase, uint32_t N, uint8_t r, uint8_t p);
+
+int libscrypt_b64_encode(/*@out@*/ char* dest, const char* str, size_t len);
+int libscrypt_b64_decode(/*@out@*/ char* dest, const char* src, size_t len);
+
+
+/* Sane default values */
+#define SCRYPT_HASH_LEN 64 /* This can be user defined - 
+ *but 64 is the reference size
+ */
+#define SCRYPT_MCF_LEN 124 /* mcf is 120 byte + nul */
+#define SCRYPT_MCF_ID "$s1"
+#define SCRYPT_N 16384
+#define SCRYPT_r 8
+#define SCRYPT_p 16
+#endif /* !_CRYPTO_SCRYPT_H_ */