Truncated history

nfq/crypto/usha.c

@@ -0,0 +1,191 @@
+/**************************** usha.c ***************************/
+/***************** See RFC 6234 for details. *******************/
+/* Copyright (c) 2011 IETF Trust and the persons identified as */
+/* authors of the code.  All rights reserved.                  */
+/* See sha.h for terms of use and redistribution.              */
+
+/*
+ *  Description:
+ *     This file implements a unified interface to the SHA algorithms.
+ */
+
+#include "sha.h"
+
+/*
+ *  USHAReset
+ *
+ *  Description:
+ *      This function will initialize the SHA Context in preparation
+ *      for computing a new SHA message digest.
+ *
+ *  Parameters:
+ *      context: [in/out]
+ *          The context to reset.
+ *      whichSha: [in]
+ *          Selects which SHA reset to call
+ *
+ *  Returns:
+ *      sha Error Code.
+ *
+ */
+int USHAReset(USHAContext *context, enum SHAversion whichSha)
+{
+  if (!context) return shaNull;
+  context->whichSha = whichSha;
+  switch (whichSha) {
+    case SHA224: return SHA224Reset((SHA224Context*)&context->ctx);
+    case SHA256: return SHA256Reset((SHA256Context*)&context->ctx);
+    default: return shaBadParam;
+  }
+}
+
+/*
+ *  USHAInput
+ *
+ *  Description:
+ *      This function accepts an array of octets as the next portion
+ *      of the message.
+ *
+ *  Parameters:
+ *      context: [in/out]
+ *          The SHA context to update.
+ *      message_array: [in]
+ *          An array of octets representing the next portion of
+ *          the message.
+ *      length: [in]
+ *          The length of the message in message_array.
+ *
+ *  Returns:
+ *      sha Error Code.
+ *
+ */
+int USHAInput(USHAContext *context,
+              const uint8_t *bytes, unsigned int bytecount)
+{
+  if (!context) return shaNull;
+  switch (context->whichSha) {
+    case SHA224:
+      return SHA224Input((SHA224Context*)&context->ctx, bytes,
+          bytecount);
+    case SHA256:
+      return SHA256Input((SHA256Context*)&context->ctx, bytes,
+          bytecount);
+    default: return shaBadParam;
+  }
+}
+
+/*
+ * USHAFinalBits
+ *
+ * Description:
+ *   This function will add in any final bits of the message.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The SHA context to update.
+ *   message_bits: [in]
+ *     The final bits of the message, in the upper portion of the
+ *     byte.  (Use 0b###00000 instead of 0b00000### to input the
+ *     three bits ###.)
+ *   length: [in]
+ *     The number of bits in message_bits, between 1 and 7.
+ *
+ * Returns:
+ *   sha Error Code.
+ */
+int USHAFinalBits(USHAContext *context,
+                  uint8_t bits, unsigned int bit_count)
+{
+  if (!context) return shaNull;
+  switch (context->whichSha) {
+    case SHA224:
+      return SHA224FinalBits((SHA224Context*)&context->ctx, bits,
+          bit_count);
+    case SHA256:
+      return SHA256FinalBits((SHA256Context*)&context->ctx, bits,
+          bit_count);
+    default: return shaBadParam;
+  }
+}
+
+/*
+ * USHAResult
+ *
+ * Description:
+ *   This function will return the message digest of the appropriate
+ *   bit size, as returned by USHAHashSizeBits(whichSHA) for the
+ *   'whichSHA' value used in the preceeding call to USHAReset,
+ *   into the Message_Digest array provided by the caller.
+ *
+ * Parameters:
+ *   context: [in/out]
+ *     The context to use to calculate the SHA-1 hash.
+ *   Message_Digest: [out]
+ *     Where the digest is returned.
+ *
+ * Returns:
+ *   sha Error Code.
+ *
+ */
+int USHAResult(USHAContext *context,
+               uint8_t Message_Digest[USHAMaxHashSize])
+{
+  if (!context) return shaNull;
+  switch (context->whichSha) {
+    case SHA224:
+      return SHA224Result((SHA224Context*)&context->ctx,
+                          Message_Digest);
+    case SHA256:
+      return SHA256Result((SHA256Context*)&context->ctx,
+                          Message_Digest);
+    default: return shaBadParam;
+  }
+}
+
+/*
+ * USHABlockSize
+ *
+ * Description:
+ *   This function will return the blocksize for the given SHA
+ *   algorithm.
+ *
+ * Parameters:
+ *   whichSha:
+ *     which SHA algorithm to query
+ *
+ * Returns:
+ *   block size
+ *
+ */
+int USHABlockSize(enum SHAversion whichSha)
+{
+  switch (whichSha) {
+    case SHA224: return SHA224_Message_Block_Size;
+    default:
+    case SHA256: return SHA256_Message_Block_Size;
+  }
+}
+
+/*
+ * USHAHashSize
+ *
+ * Description:
+ *   This function will return the hashsize for the given SHA
+ *   algorithm.
+ *
+ * Parameters:
+ *   whichSha:
+ *     which SHA algorithm to query
+ *
+ * Returns:
+ *   hash size
+ *
+ */
+int USHAHashSize(enum SHAversion whichSha)
+{
+  switch (whichSha) {
+    case SHA224: return SHA224HashSize;
+    default:
+    case SHA256: return SHA256HashSize;
+  }
+}