Replace openssl SHA1 functions with custom version

1 files changed, 25 insertions, 0 deletions

diff --git a/src/sha1.h b/src/sha1.h
new file mode 100644
index 0000000..ee59229
--- /dev/null
+++ b/src/sha1.h
@@ -0,0 +1,25 @@
+/*
+ * Secure Hash Algorith SHA-1, as published in FIPS PUB 180-2.
+ *
+ * This implementation is in the public domain.  Copyright abandoned.
+ * You may do anything you like with it, including evil things.
+ *
+ * This is a rewrite from scratch, based on Linus Torvalds' "block-sha1"
+ * from the git mailing list (August, 2009).  Additional optimization
+ * ideas cribbed from
+ * - Artur Skawina (x86, particularly P4, and much benchmarking)
+ * - Nicolas Pitre (ARM)
+ */
+
+#include <stddef.h>	/* For size_t */
+#include <stdint.h>	/* For uint32_t, uint64_t */
+
+typedef struct SHA_context {
+        uint64_t len;	/* May be shrunk to uint32_t */
+        uint32_t iv[5];
+        unsigned char buf[64];	/* Must be 32-bit aligned */
+} SHA_CTX;
+
+void SHA1_Init(struct SHA_context *c);
+void SHA1_Update(struct SHA_context *c, void const *p, size_t n);
+void SHA1_Final(unsigned char hash[20], struct SHA_context *c);