xnu-2050.7.9.tar.gz

[apple/xnu.git] / libkern / crypto / corecrypto_md5.c

diff --git a/libkern/crypto/corecrypto_md5.c b/libkern/crypto/corecrypto_md5.c
new file mode 100644 (file)
index 0000000..70225a5
--- /dev/null
+++ b/libkern/crypto/corecrypto_md5.c
@@ -0,0 +1,65 @@
+
+#include <libkern/crypto/crypto_internal.h>
+#include <libkern/crypto/md5.h>
+#include <kern/debug.h>
+#include <corecrypto/ccdigest.h>
+
+static uint64_t getCount(MD5_CTX *ctx)
+{
+       return ( (((uint64_t)ctx->count[0])<<32) | (ctx->count[1]) );
+}
+
+static void setCount(MD5_CTX *ctx, uint64_t count)
+{
+       ctx->count[0]=(uint32_t)(count>>32);
+       ctx->count[1]=(uint32_t)count;
+}
+
+/* Copy a ccdigest ctx into a legacy MD5 context */
+static void DiToMD5(const struct ccdigest_info *di, struct ccdigest_ctx *di_ctx, MD5_CTX *md5_ctx)
+{
+       setCount(md5_ctx, ccdigest_nbits(di, di_ctx)/8+ccdigest_num(di, di_ctx));
+       memcpy(md5_ctx->buffer, ccdigest_data(di, di_ctx), di->block_size);
+       memcpy(md5_ctx->state, ccdigest_state_ccn(di, di_ctx), di->state_size);
+}
+
+/* Copy a legacy MD5 context into a ccdigest ctx  */
+static void MD5ToDi(const struct ccdigest_info *di, MD5_CTX *md5_ctx, struct ccdigest_ctx *di_ctx)
+{
+       uint64_t count = getCount(md5_ctx);
+       
+       ccdigest_num(di, di_ctx)=count%di->block_size;
+       ccdigest_nbits(di, di_ctx)=(count-ccdigest_num(di, di_ctx))*8;
+       memcpy(ccdigest_data(di, di_ctx), md5_ctx->buffer, di->block_size);
+       memcpy(ccdigest_state_ccn(di, di_ctx), md5_ctx->state, di->state_size); 
+}
+
+void MD5Init(MD5_CTX *ctx)
+{
+       const struct ccdigest_info *di=g_crypto_funcs->ccmd5_di;
+       ccdigest_di_decl(di, di_ctx);
+       
+       g_crypto_funcs->ccdigest_init_fn(di, di_ctx);
+       
+       DiToMD5(di, di_ctx, ctx);
+}
+
+void MD5Update(MD5_CTX *ctx, const void *data, unsigned int len)
+{
+       const struct ccdigest_info *di=g_crypto_funcs->ccmd5_di;
+       ccdigest_di_decl(di, di_ctx);
+       
+       MD5ToDi(di, ctx, di_ctx);
+       g_crypto_funcs->ccdigest_update_fn(di, di_ctx, len, data);      
+       DiToMD5(di, di_ctx, ctx);
+}
+
+void MD5Final(unsigned char digest[MD5_DIGEST_LENGTH], MD5_CTX *ctx)
+{
+       const struct ccdigest_info *di=g_crypto_funcs->ccmd5_di;
+       ccdigest_di_decl(di, di_ctx);
+       
+       MD5ToDi(di, ctx, di_ctx);
+       ccdigest_final(di, di_ctx, digest);
+}
+