tanbro · April 20, 2022 08:14 · Apr 20, 2022
diff --git a/openssl_base64_encode.c b/openssl_base64_encode.c
@@ -0,0 +1,42 @@
+#include <stddef.h>
+#include <memory.h>
+
+#include <openssl/bio.h>
+#include <openssl/buffer.h>
+#include <openssl/evp.h>
+
+/// 参考: https://www.openssl.org/docs/man1.0.2/man3/BIO_f_base64.html 以及
+/// https://gist.github.com/barrysteyn/7308212
+
+void b64_encode_s(const unsigned char *in_data, size_t in_len, char **out_str) {
+  BIO_s_mem();
+  BIO *b64 = BIO_new(BIO_f_base64());
+  BIO *bio = BIO_new(BIO_s_mem());
+  BIO_set_close(bio, BIO_NOCLOSE);
+  BIO_push(b64, bio);
+  BIO_write(b64, in_data, in_len);
+  BIO_flush(b64);
+  BUF_MEM *pbuf;
+  BIO_get_mem_ptr(bio, &(pbuf));
+  *out_str = (char *)calloc(pbuf->length + 1, sizeof(char));
+  memcpy(*out_str, pbuf->data, pbuf->length);
+  BIO_free_all(bio);
+}
+
+void b64_encode_b(const unsigned char *in_data, size_t in_len,
+                  unsigned char **out_data, size_t *out_len) {
+  BIO_s_mem();
+  BIO *b64 = BIO_new(BIO_f_base64());
+  BIO *bio = BIO_new(BIO_s_mem());
+  BIO_push(b64, bio);
+  BIO_write(b64, in_data, in_len);
+  BIO_flush(b64);
+  BIO_set_close(bio, BIO_NOCLOSE);
+  BUF_MEM *pbuf;
+  BIO_get_mem_ptr(bio, &(pbuf));
+  *out_data = (unsigned char *)calloc(pbuf->length, sizeof(unsigned char));
+  memcpy(*out_data, pbuf->data, pbuf->length);
+  if (out_len)
+    *out_len = pbuf->length;
+  BIO_free_all(bio);
+}