func (ctx *decryptionCipherCtx) DecryptFinal() ([]byte, error) {
outbuf := make([]byte, ctx.BlockSize())
var outlen C.int
if 1 != C.EVP_DecryptFinal_ex(ctx.ctx, (*C.uchar)(&outbuf[0]), &outlen) {
// this may mean the tag failed to verify- all previous plaintext
// returned must be considered faked and invalid
return nil, errors.New("decryption failed")
}
return outbuf[:outlen], nil
}
// Open decrypts "in" using "iv" and "authData" and append the result to "dst"
func (g stupidGCM) Open(dst, iv, in, authData []byte) ([]byte, error) {
if len(iv) != ivLen {
log.Panicf("Only %d-byte IVs are supported", ivLen)
}
if len(in) <= tagLen {
log.Panic("Input data too short")
}
buf := make([]byte, len(in)-tagLen)
ciphertext := in[:len(in)-tagLen]
tag := in[len(in)-tagLen:]
// https://wiki.openssl.org/index.php/EVP_Authenticated_Encryption_and_Decryption#Authenticated_Encryption_using_GCM_mode
// Create scratch space "context"
ctx := C.EVP_CIPHER_CTX_new()
if ctx == nil {
log.Panic("EVP_CIPHER_CTX_new failed")
}
// Set cipher to AES-256
if C.EVP_DecryptInit_ex(ctx, C.EVP_aes_256_gcm(), nil, nil, nil) != 1 {
log.Panic("EVP_DecryptInit_ex I failed")
}
// Use 16-byte IV
if C.EVP_CIPHER_CTX_ctrl(ctx, C.EVP_CTRL_GCM_SET_IVLEN, ivLen, nil) != 1 {
log.Panic("EVP_CIPHER_CTX_ctrl EVP_CTRL_GCM_SET_IVLEN failed")
}
// Set key and IV
if C.EVP_DecryptInit_ex(ctx, nil, nil, (*C.uchar)(&g.key[0]), (*C.uchar)(&iv[0])) != 1 {
log.Panic("EVP_DecryptInit_ex II failed")
}
// Set expected GMAC tag
if C.EVP_CIPHER_CTX_ctrl(ctx, C.EVP_CTRL_GCM_SET_TAG, tagLen, (unsafe.Pointer)(&tag[0])) != 1 {
log.Panic("EVP_CIPHER_CTX_ctrl failed")
}
// Provide authentication data
var resultLen C.int
if C.EVP_DecryptUpdate(ctx, nil, &resultLen, (*C.uchar)(&authData[0]), C.int(len(authData))) != 1 {
log.Panic("EVP_DecryptUpdate authData failed")
}
if int(resultLen) != len(authData) {
log.Panicf("Unexpected length %d", resultLen)
}
// Decrypt "ciphertext" into "buf"
if C.EVP_DecryptUpdate(ctx, (*C.uchar)(&buf[0]), &resultLen, (*C.uchar)(&ciphertext[0]), C.int(len(ciphertext))) != 1 {
log.Panic("EVP_DecryptUpdate failed")
}
if int(resultLen) != len(ciphertext) {
log.Panicf("Unexpected length %d", resultLen)
}
// Check GMAC
dummy := make([]byte, 16)
res := C.EVP_DecryptFinal_ex(ctx, (*C.uchar)(&dummy[0]), &resultLen)
if resultLen != 0 {
log.Panicf("Unexpected length %d", resultLen)
}
// Free scratch space
C.EVP_CIPHER_CTX_free(ctx)
if res != 1 {
return nil, fmt.Errorf("stupidgcm: message authentication failed")
}
return append(dst, buf...), nil
}