diff options
Diffstat (limited to 'crypto/cipher-gcrypt.c')
| -rw-r--r-- | crypto/cipher-gcrypt.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/crypto/cipher-gcrypt.c b/crypto/cipher-gcrypt.c index 2864099527..81e4745bff 100644 --- a/crypto/cipher-gcrypt.c +++ b/crypto/cipher-gcrypt.c @@ -245,6 +245,7 @@ static QCryptoCipherGcrypt *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg, g_assert_not_reached(); } } + g_assert(is_power_of_2(ctx->blocksize)); #ifdef CONFIG_QEMU_PRIVATE_XTS if (mode == QCRYPTO_CIPHER_MODE_XTS) { @@ -305,7 +306,7 @@ qcrypto_gcrypt_cipher_encrypt(QCryptoCipher *cipher, QCryptoCipherGcrypt *ctx = cipher->opaque; gcry_error_t err; - if (len % ctx->blocksize) { + if (len & (ctx->blocksize - 1)) { error_setg(errp, "Length %zu must be a multiple of block size %zu", len, ctx->blocksize); return -1; @@ -344,7 +345,7 @@ qcrypto_gcrypt_cipher_decrypt(QCryptoCipher *cipher, QCryptoCipherGcrypt *ctx = cipher->opaque; gcry_error_t err; - if (len % ctx->blocksize) { + if (len & (ctx->blocksize - 1)) { error_setg(errp, "Length %zu must be a multiple of block size %zu", len, ctx->blocksize); return -1; |