1 files changed, 49 insertions, 0 deletions
diff --git a/openssl-sys/src/old_openssl_shim.c b/openssl-sys/src/old_openssl_shim.c
new file mode 100644
index 00000000..473bd2ae
--- /dev/null
+++ b/openssl-sys/src/old_openssl_shim.c
@@ -0,0 +1,49 @@
+#include <openssl/hmac.h>
+
+#ifdef OLD_OPENSSL
+// Copied from openssl crypto/hmac/hmac.c
+int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
+     {
+     if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx))
+         goto err;
+     if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx))
+         goto err;
+     if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx))
+         goto err;
+     memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
+     dctx->key_length = sctx->key_length;
+     dctx->md = sctx->md;
+     return 1;
+     err:
+     return 0;
+     }
+
+int HMAC_Init_ex_shim(HMAC_CTX *ctx, const void *key, int key_len, const EVP_MD *md, ENGINE *impl) {
+    HMAC_Init_ex(ctx, key, key_len, md, impl);
+    return 1;
+}
+
+int HMAC_Update_shim(HMAC_CTX *ctx, const unsigned char *data, int len) {
+    HMAC_Update(ctx, data, len);
+    return 1;
+}
+
+int HMAC_Final_shim(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) {
+    HMAC_Final(ctx, md, len);
+    return 1;
+}
+
+#else /* OLD_OPENSSL */
+
+int HMAC_Init_ex_shim(HMAC_CTX *ctx, const void *key, int key_len, const EVP_MD *md, ENGINE *impl) {
+    return HMAC_Init_ex(ctx, key, key_len, md, impl);
+}
+
+int HMAC_Update_shim(HMAC_CTX *ctx, const unsigned char *data, int len) {
+    return HMAC_Update(ctx, data, len);
+}
+
+int HMAC_Final_shim(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) {
+    return HMAC_Final(ctx, md, len);
+}
+#endif /* OLD_OPENSSL */