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diff --git a/lib/sha1.h b/lib/sha1.h
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+/*
+ * SHA1 hashing code copied from Lepton's crack <http://usuarios.lycos.es/reinob/>
+ *
+ * Adapted to be API-compatible with the previous (GPL-incompatible) code.
+ */
+
+/*
+ *  sha1.h
+ *
+ *  Description:
+ *      This is the header file for code which implements the Secure
+ *      Hashing Algorithm 1 as defined in FIPS PUB 180-1 published
+ *      April 17, 1995.
+ *
+ *      Many of the variable names in this code, especially the
+ *      single character names, were used because those were the names
+ *      used in the publication.
+ *
+ *      Please read the file sha1.c for more information.
+ *
+ */
+
+#ifndef _SHA1_H_
+#define _SHA1_H_
+
+#include <stdint.h>
+#include <gmodule.h>
+
+#ifndef _SHA_enum_
+#define _SHA_enum_
+enum {
+	shaSuccess = 0,
+	shaNull,		/* Null pointer parameter */
+	shaInputTooLong,	/* input data too long */
+	shaStateError		/* called Input after Result */
+};
+#endif
+#define sha1_hash_size 20
+
+/*
+ *  This structure will hold context information for the SHA-1
+ *  hashing operation
+ */
+typedef struct SHA1Context {
+	uint32_t Intermediate_Hash[sha1_hash_size/4];	/* Message Digest   */
+
+	uint32_t Length_Low;            /* Message length in bits           */
+	uint32_t Length_High;           /* Message length in bits           */
+
+	/* Index into message block array   */
+	int_least16_t Message_Block_Index;
+	uint8_t Message_Block[64];	/* 512-bit message blocks           */
+
+	int Computed;                   /* Is the digest computed?          */
+	int Corrupted;                  /* Is the message digest corrupted? */
+} sha1_state_t;
+
+/*
+ *  Function Prototypes
+ */
+
+G_MODULE_EXPORT int sha1_init(sha1_state_t *);
+G_MODULE_EXPORT int sha1_append(sha1_state_t *, const uint8_t *, unsigned int);
+G_MODULE_EXPORT int sha1_finish(sha1_state_t *, uint8_t Message_Digest[sha1_hash_size]);
+
+#endif