Someone asked for an example of decoding with OpenSSL on the Howto base64 encode with C/C++ and OpenSSL post. So here it is:
#include <string.h> #include <openssl/sha.h> #include <openssl/hmac.h> #include <openssl/evp.h> #include <openssl/bio.h> #include <openssl/buffer.h> char *unbase64(unsigned char *input, int length); int main(int argc, char **argv) { char *output = unbase64("WU9ZTyEA\n\0", strlen("WU9ZTyEA\n\0")); printf("Unbase64: *%s*\n", output); free(output); } char *unbase64(unsigned char *input, int length) { BIO *b64, *bmem; char *buffer = (char *)malloc(length); memset(buffer, 0, length); b64 = BIO_new(BIO_f_base64()); bmem = BIO_new_mem_buf(input, length); bmem = BIO_push(b64, bmem); BIO_read(bmem, buffer, length); BIO_free_all(bmem); return buffer; }