1 files changed, 122 insertions, 0 deletions
diff --git a/source4/heimdal/lib/hcrypto/hmac.c b/source4/heimdal/lib/hcrypto/hmac.c
new file mode 100644
index 0000000000..848b987a90
--- /dev/null
+++ b/source4/heimdal/lib/hcrypto/hmac.c
@@ -0,0 +1,122 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <hmac.h>
+
+void
+HMAC_CTX_init(HMAC_CTX *ctx)
+{
+    memset(ctx, 0, sizeof(*ctx));
+}
+
+void
+HMAC_CTX_cleanup(HMAC_CTX *ctx)
+{
+    if (ctx->buf) {
+	memset(ctx->buf, 0, ctx->key_length);
+	free(ctx->buf);
+	ctx->buf = NULL;
+    }
+    if (ctx->opad) {
+	memset(ctx->ipad, 0, ctx->key_length);
+	free(ctx->opad);
+	ctx->opad = NULL;
+    }
+    if (ctx->ipad) {
+	memset(ctx->ipad, 0, ctx->key_length);
+	free(ctx->ipad);
+	ctx->ipad = NULL;
+    }
+    if (ctx->ctx) {
+	EVP_MD_CTX_destroy(ctx->ctx);
+	ctx->ctx = NULL;
+    }
+}
+
+size_t
+HMAC_size(const HMAC_CTX *ctx)
+{
+    return EVP_MD_size(ctx->md);
+}
+
+void
+HMAC_Init_ex(HMAC_CTX *ctx,
+	     const void *key,
+	     size_t keylen,
+	     const EVP_MD *md,
+	     ENGINE *engine)
+{
+    unsigned char *p;
+    size_t i;
+
+    if (ctx->md != md) {
+	ctx->md = md;
+	if (ctx->buf)
+	    free (ctx->buf);
+	ctx->key_length = EVP_MD_size(ctx->md);
+	ctx->buf = malloc(ctx->key_length);
+    }
+#if 0
+    ctx->engine = engine;
+#endif
+
+    if (keylen > EVP_MD_block_size(ctx->md)) {
+	EVP_Digest(key, keylen, ctx->buf, NULL, ctx->md, engine);
+	key = ctx->buf;
+	keylen = EVP_MD_size(ctx->md);
+    }
+
+    if (ctx->opad)
+	free(ctx->opad);
+    if (ctx->ipad)
+	free(ctx->ipad);
+
+    ctx->opad = malloc(EVP_MD_block_size(ctx->md));
+    ctx->ipad = malloc(EVP_MD_block_size(ctx->md));
+    memset(ctx->ipad, 0x36, EVP_MD_block_size(ctx->md));
+    memset(ctx->opad, 0x5c, EVP_MD_block_size(ctx->md));
+
+    for (i = 0, p = ctx->ipad; i < keylen; i++)
+	p[i] ^= ((const unsigned char *)key)[i];
+    for (i = 0, p = ctx->opad; i < keylen; i++)
+	p[i] ^= ((const unsigned char *)key)[i];
+
+    ctx->ctx = EVP_MD_CTX_create();
+
+    EVP_DigestInit_ex(ctx->ctx, ctx->md, ctx->engine);
+    EVP_DigestUpdate(ctx->ctx, ctx->ipad, EVP_MD_block_size(ctx->md));
+}
+
+void
+HMAC_Update(HMAC_CTX *ctx, const void *data, size_t len)
+{
+    EVP_DigestUpdate(ctx->ctx, data, len);
+}
+
+void
+HMAC_Final(HMAC_CTX *ctx, void *md, unsigned int *len)
+{
+    EVP_DigestFinal_ex(ctx->ctx, ctx->buf, NULL);
+
+    EVP_DigestInit_ex(ctx->ctx, ctx->md, ctx->engine);
+    EVP_DigestUpdate(ctx->ctx, ctx->opad, EVP_MD_block_size(ctx->md));
+    EVP_DigestUpdate(ctx->ctx, ctx->buf, ctx->key_length);
+    EVP_DigestFinal_ex(ctx->ctx, md, len);
+}
+
+void *
+HMAC(const EVP_MD *md,
+     const void *key, size_t key_size,
+     const void *data, size_t data_size, 
+     void *hash, unsigned int *hash_len)
+{
+    HMAC_CTX ctx;
+
+    HMAC_CTX_init(&ctx);
+    HMAC_Init_ex(&ctx, key, key_size, md, NULL);
+    HMAC_Update(&ctx, data, data_size);
+    HMAC_Final(&ctx, hash, hash_len);
+    HMAC_CTX_cleanup(&ctx);
+    return hash;
+}