Changeset efd19aa in rtems

Timestamp:

07/09/18 07:24:05 (5 years ago)

Author:

Conrad Meyer <cem@…>

Branches:

master

Children:

f5ee9a0

Parents:

48f7979

git-author:

Conrad Meyer <cem@…> (07/09/18 07:24:05)

git-committer:

Sebastian Huber <sebastian.huber@…> (09/08/22 14:14:56)

Message:

Implement SHA2-224 submode of SHA2-256

Like SHA2-384:SHA2-512, SHA2-224 is simply a truncated SHA2-256 with a
different initial vector. Add to round out the complete basic SHA2 family.

Location:

cpukit

Files:

• include/sha224.h (added)
• libmd/sha256c.c (modified) (2 diffs)

cpukit/libmd/sha256c.c

@@ -33 +33 @@
 #include <string.h>
 
+#include "sha224.h"
 #include "sha256.h"
 
@@ -297 +298 @@
         memset(ctx, 0, sizeof(*ctx));
 }
+
+/*** SHA-224: *********************************************************/
+/*
+ * the SHA224 and SHA256 transforms are identical
+ */
+
+/* SHA-224 initialization.  Begins a SHA-224 operation. */
+void
+SHA224_Init(SHA224_CTX * ctx)
+{
+
+        /* Zero bits processed so far */
+        ctx->count = 0;
+
+        /* Magic initialization constants */
+        ctx->state[0] = 0xC1059ED8;
+        ctx->state[1] = 0x367CD507;
+        ctx->state[2] = 0x3070DD17;
+        ctx->state[3] = 0xF70E5939;
+        ctx->state[4] = 0xFFC00B31;
+        ctx->state[5] = 0x68581511;
+        ctx->state[6] = 0x64f98FA7;
+        ctx->state[7] = 0xBEFA4FA4;
+}
+
+/* Add bytes into the SHA-224 hash */
+void
+SHA224_Update(SHA224_CTX * ctx, const void *in, size_t len)
+{
+
+        SHA256_Update((SHA256_CTX *)ctx, in, len);
+}
+
+/*
+ * SHA-224 finalization.  Pads the input data, exports the hash value,
+ * and clears the context state.
+ */
+void
+SHA224_Final(unsigned char digest[static SHA224_DIGEST_LENGTH], SHA224_CTX *ctx)
+{
+
+        /* Add padding */
+        SHA256_Pad((SHA256_CTX *)ctx);
+
+        /* Write the hash */
+        be32enc_vect(digest, ctx->state, SHA224_DIGEST_LENGTH);
+
+        /* Clear the context state */
+        explicit_bzero(ctx, sizeof(*ctx));
+}