1 files changed, 49 insertions, 0 deletions
diff --git a/sha256/openssl.h b/sha256/openssl.h
new file mode 100644
index 0000000000..c1083d9491
--- /dev/null
+++ b/sha256/openssl.h
@@ -0,0 +1,49 @@
+/* wrappers for the EVP API of OpenSSL 3+ */
+#ifndef SHA256_OPENSSL_H
+#define SHA256_OPENSSL_H
+#include <openssl/evp.h>
+
+struct openssl_SHA256_CTX {
+	EVP_MD_CTX *ectx;
+};
+
+typedef struct openssl_SHA256_CTX openssl_SHA256_CTX;
+
+static inline void openssl_SHA256_Init(struct openssl_SHA256_CTX *ctx)
+{
+	const EVP_MD *type = EVP_sha256();
+
+	ctx->ectx = EVP_MD_CTX_new();
+	if (!ctx->ectx)
+		die("EVP_MD_CTX_new: out of memory");
+
+	EVP_DigestInit_ex(ctx->ectx, type, NULL);
+}
+
+static inline void openssl_SHA256_Update(struct openssl_SHA256_CTX *ctx,
+					const void *data,
+					size_t len)
+{
+	EVP_DigestUpdate(ctx->ectx, data, len);
+}
+
+static inline void openssl_SHA256_Final(unsigned char *digest,
+				       struct openssl_SHA256_CTX *ctx)
+{
+	EVP_DigestFinal_ex(ctx->ectx, digest, NULL);
+	EVP_MD_CTX_free(ctx->ectx);
+}
+
+static inline void openssl_SHA256_Clone(struct openssl_SHA256_CTX *dst,
+					const struct openssl_SHA256_CTX *src)
+{
+	EVP_MD_CTX_copy_ex(dst->ectx, src->ectx);
+}
+
+#define platform_SHA256_CTX openssl_SHA256_CTX
+#define platform_SHA256_Init openssl_SHA256_Init
+#define platform_SHA256_Clone openssl_SHA256_Clone
+#define platform_SHA256_Update openssl_SHA256_Update
+#define platform_SHA256_Final openssl_SHA256_Final
+
+#endif /* SHA256_OPENSSL_H */