diff options
| -rw-r--r-- | internal/stupidgcm/stupidgcm.go | 46 |
1 files changed, 31 insertions, 15 deletions
diff --git a/internal/stupidgcm/stupidgcm.go b/internal/stupidgcm/stupidgcm.go index f92bc01..fc53132 100644 --- a/internal/stupidgcm/stupidgcm.go +++ b/internal/stupidgcm/stupidgcm.go @@ -3,6 +3,7 @@ package stupidgcm // #include <openssl/evp.h> +// #include <openssl/err.h> // #cgo pkg-config: libcrypto import "C" @@ -18,6 +19,21 @@ const ( tagLen = 16 ) +func opensslPanic(msg string) { + for { + e := C.ERR_get_error() + if e == 0 { + break + } + log.Printf("openssl error: %d:%s:%s:%s", e, + C.GoString(C.ERR_lib_error_string(e)), + C.GoString(C.ERR_func_error_string(e)), + C.GoString(C.ERR_reason_error_string(e))) + } + log.Printf("(no further openssl error messages)") + log.Panic(msg) +} + // stupidGCM implements the cipher.AEAD interface type stupidGCM struct { key []byte @@ -53,28 +69,28 @@ func (g stupidGCM) Seal(dst, iv, in, authData []byte) []byte { // Create scratch space "context" ctx := C.EVP_CIPHER_CTX_new() if ctx == nil { - log.Panic("EVP_CIPHER_CTX_new failed") + opensslPanic("EVP_CIPHER_CTX_new failed") } // Set cipher to AES-256 if C.EVP_EncryptInit_ex(ctx, C.EVP_aes_256_gcm(), nil, nil, nil) != 1 { - log.Panic("EVP_EncryptInit_ex I failed") + opensslPanic("EVP_EncryptInit_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") + opensslPanic("EVP_CIPHER_CTX_ctrl EVP_CTRL_GCM_SET_IVLEN failed") } // Set key and IV if C.EVP_EncryptInit_ex(ctx, nil, nil, (*C.uchar)(&g.key[0]), (*C.uchar)(&iv[0])) != 1 { - log.Panic("EVP_EncryptInit_ex II failed") + opensslPanic("EVP_EncryptInit_ex II failed") } // Provide authentication data var resultLen C.int if C.EVP_EncryptUpdate(ctx, nil, &resultLen, (*C.uchar)(&authData[0]), C.int(len(authData))) != 1 { - log.Panic("EVP_EncryptUpdate authData failed") + opensslPanic("EVP_EncryptUpdate authData failed") } if int(resultLen) != len(authData) { log.Panicf("Unexpected length %d", resultLen) @@ -82,7 +98,7 @@ func (g stupidGCM) Seal(dst, iv, in, authData []byte) []byte { // Encrypt "in" into "buf" if C.EVP_EncryptUpdate(ctx, (*C.uchar)(&buf[0]), &resultLen, (*C.uchar)(&in[0]), C.int(len(in))) != 1 { - log.Panic("EVP_EncryptUpdate failed") + opensslPanic("EVP_EncryptUpdate failed") } if int(resultLen) != len(in) { log.Panicf("Unexpected length %d", resultLen) @@ -92,7 +108,7 @@ func (g stupidGCM) Seal(dst, iv, in, authData []byte) []byte { // Because GCM is a stream encryption, this will not write out any data. dummy := make([]byte, 16) if C.EVP_EncryptFinal_ex(ctx, (*C.uchar)(&dummy[0]), &resultLen) != 1 { - log.Panic("EVP_EncryptFinal_ex failed") + opensslPanic("EVP_EncryptFinal_ex failed") } if resultLen != 0 { log.Panicf("Unexpected length %d", resultLen) @@ -100,7 +116,7 @@ func (g stupidGCM) Seal(dst, iv, in, authData []byte) []byte { // Get GMAC tag and append it to the ciphertext in "buf" if C.EVP_CIPHER_CTX_ctrl(ctx, C.EVP_CTRL_GCM_GET_TAG, tagLen, (unsafe.Pointer)(&buf[len(in)])) != 1 { - log.Panic("EVP_CIPHER_CTX_ctrl EVP_CTRL_GCM_GET_TAG failed") + opensslPanic("EVP_CIPHER_CTX_ctrl EVP_CTRL_GCM_GET_TAG failed") } // Free scratch space @@ -126,28 +142,28 @@ func (g stupidGCM) Open(dst, iv, in, authData []byte) ([]byte, error) { // Create scratch space "context" ctx := C.EVP_CIPHER_CTX_new() if ctx == nil { - log.Panic("EVP_CIPHER_CTX_new failed") + opensslPanic("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") + opensslPanic("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") + opensslPanic("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") + opensslPanic("EVP_DecryptInit_ex II 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") + opensslPanic("EVP_DecryptUpdate authData failed") } if int(resultLen) != len(authData) { log.Panicf("Unexpected length %d", resultLen) @@ -155,7 +171,7 @@ func (g stupidGCM) Open(dst, iv, in, authData []byte) ([]byte, error) { // 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") + opensslPanic("EVP_DecryptUpdate failed") } if int(resultLen) != len(ciphertext) { log.Panicf("Unexpected length %d", resultLen) @@ -163,7 +179,7 @@ func (g stupidGCM) Open(dst, iv, in, authData []byte) ([]byte, error) { // 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") + opensslPanic("EVP_CIPHER_CTX_ctrl failed") } // Check GMAC |