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Merge pull request #503 from embhorn/gh8764 

Clarify aesgcm-file-encrypt demo
pull/504/merge
Daniel Pouzzner 2025-05-16 12:43:53 -05:00 committed by GitHub
parent 7e65d00e0a 6df432eaac
commit 9b02ca2ad9
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 7 additions and 11 deletions
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18
crypto/aes/aesgcm-file-encrypt.c
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@ -340,8 +340,7 @@ int decrypt_file_AesGCM(const char *in_file, const char *out_file,
byte iv[AES_IV_SIZE]; byte iv[AES_IV_SIZE];
byte wolf_magic[strlen(WOLFCRYPT_MAGIC)]; byte wolf_magic[strlen(WOLFCRYPT_MAGIC)];
byte key[AES_KEY_SIZE]; byte key[AES_KEY_SIZE];
byte tag_dec[AESGCM_TAG_SIZE]; byte tag[AESGCM_TAG_SIZE];
byte tag_enc[AESGCM_TAG_SIZE];
Aes gcm; Aes gcm;
if (!in_file || !out_file || !key_str) { if (!in_file || !out_file || !key_str) {
@ -396,8 +395,7 @@ int decrypt_file_AesGCM(const char *in_file, const char *out_file,
memset(&gcm, 0, sizeof(Aes)); memset(&gcm, 0, sizeof(Aes));
memset(iv, 0, AES_IV_SIZE); memset(iv, 0, AES_IV_SIZE);
memset(key, 0, AES_KEY_SIZE); memset(key, 0, AES_KEY_SIZE);
memset(tag_dec, 0, AESGCM_TAG_SIZE); memset(tag, 0, AESGCM_TAG_SIZE);
memset(tag_enc, 0, AESGCM_TAG_SIZE);
strncpy((char *)key, key_str, AES_KEY_SIZE); strncpy((char *)key, key_str, AES_KEY_SIZE);
/* Extract a WOLFCRYPT MAGIC | TAG | IV from the cipher file */ /* Extract a WOLFCRYPT MAGIC | TAG | IV from the cipher file */
@ -412,12 +410,13 @@ int decrypt_file_AesGCM(const char *in_file, const char *out_file,
ret = AES_GCM_AUTH_E; ret = AES_GCM_AUTH_E;
goto exit; goto exit;
} }
read_size = read(in_fd, tag_enc, AESGCM_TAG_SIZE); read_size = read(in_fd, tag, AESGCM_TAG_SIZE);
if (read_size != AESGCM_TAG_SIZE) { if (read_size != AESGCM_TAG_SIZE) {
perror("read"); perror("read");
ret = -1; ret = -1;
goto exit; goto exit;
} }
read_size = read(in_fd, iv, AES_IV_SIZE); read_size = read(in_fd, iv, AES_IV_SIZE);
if (read_size != AES_IV_SIZE) { if (read_size != AES_IV_SIZE) {
perror("read"); perror("read");
@ -443,12 +442,9 @@ int decrypt_file_AesGCM(const char *in_file, const char *out_file,
} }
if (ret == 0) { if (ret == 0) {
ret = wc_AesGcmEncryptFinal(&gcm, tag_dec, AESGCM_TAG_SIZE); /* The tag param is used to compare to the
if (ret == 0 && (memcmp(tag_enc, tag_dec, AESGCM_TAG_SIZE) != 0)) { calculated tag during decryption */
perror("TAG didn't match\n"); ret = wc_AesGcmDecryptFinal(&gcm, tag, AESGCM_TAG_SIZE);
ret = AES_GCM_AUTH_E;
goto exit;
}
} }
exit: exit:
free(in_buf); free(in_buf);