1 files changed, 65 insertions, 0 deletions
diff --git a/src/lib/hmac-cram-md5.c b/src/lib/hmac-cram-md5.c
new file mode 100644
index 0000000..46d73c4
--- /dev/null
+++ b/src/lib/hmac-cram-md5.c
@@ -0,0 +1,65 @@
+/*
+ * CRAM-MD5 (RFC 2195) compatibility code
+ * Copyright (c) 2003 Joshua Goodall <joshua@roughtrade.net>
+ *
+ * This software is released under the MIT license.
+ */
+
+#include "lib.h"
+#include "md5.h"
+#include "hmac-cram-md5.h"
+
+void hmac_md5_get_cram_context(struct hmac_context *_hmac_ctx,
+			unsigned char context_digest[CRAM_MD5_CONTEXTLEN])
+{
+	struct hmac_context_priv *hmac_ctx = &_hmac_ctx->u.priv;
+	unsigned char *cdp;
+
+	struct md5_context *ctx = (void*)hmac_ctx->ctx;
+	struct md5_context *ctxo = (void*)hmac_ctx->ctxo;
+
+#define CDPUT(p, c) STMT_START {   \
+	*(p)++ = (c) & 0xff;       \
+	*(p)++ = (c) >> 8 & 0xff;  \
+	*(p)++ = (c) >> 16 & 0xff; \
+	*(p)++ = (c) >> 24 & 0xff; \
+} STMT_END
+	cdp = context_digest;
+	CDPUT(cdp, ctxo->a);
+	CDPUT(cdp, ctxo->b);
+	CDPUT(cdp, ctxo->c);
+	CDPUT(cdp, ctxo->d);
+	CDPUT(cdp, ctx->a);
+	CDPUT(cdp, ctx->b);
+	CDPUT(cdp, ctx->c);
+	CDPUT(cdp, ctx->d);
+}
+
+void hmac_md5_set_cram_context(struct hmac_context *_hmac_ctx,
+			const unsigned char context_digest[CRAM_MD5_CONTEXTLEN])
+{
+	struct hmac_context_priv *hmac_ctx = &_hmac_ctx->u.priv;
+	const unsigned char *cdp;
+
+	struct md5_context *ctx = (void*)hmac_ctx->ctx;
+	struct md5_context *ctxo = (void*)hmac_ctx->ctxo;
+
+#define CDGET(p, c) STMT_START { \
+	(c)  = (*p++);           \
+	(c) += (*p++ << 8);      \
+	(c) += (*p++ << 16);     \
+	(c) += ((uint32_t)(*p++) << 24);     \
+} STMT_END
+	cdp = context_digest;
+	CDGET(cdp, ctxo->a);
+	CDGET(cdp, ctxo->b);
+	CDGET(cdp, ctxo->c);
+	CDGET(cdp, ctxo->d);
+	CDGET(cdp, ctx->a);
+	CDGET(cdp, ctx->b);
+	CDGET(cdp, ctx->c);
+	CDGET(cdp, ctx->d);
+
+	ctxo->lo = ctx->lo = 64;
+	ctxo->hi = ctx->hi = 0;
+}