+ /* we assume block size is a power of 2 in *cryptUpdate */
+ OPENSSL_assert(ctx->cipher->block_size == 1
+ || ctx->cipher->block_size == 8
+ || ctx->cipher->block_size == 16);
+
+ if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
+ && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
+ EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
+ return 0;
+ }
+
+ if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
+ switch (EVP_CIPHER_CTX_mode(ctx)) {
+
+ case EVP_CIPH_STREAM_CIPHER:
+ case EVP_CIPH_ECB_MODE:
+ break;
+
+ case EVP_CIPH_CFB_MODE:
+ case EVP_CIPH_OFB_MODE:
+
+ ctx->num = 0;
+ /* fall-through */
+
+ case EVP_CIPH_CBC_MODE:
+
+ OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
+ (int)sizeof(ctx->iv));
+ if (iv)
+ memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
+ memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
+ break;
+
+ case EVP_CIPH_CTR_MODE:
+ ctx->num = 0;
+ /* Don't reuse IV for CTR mode */
+ if (iv)
+ memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
+ break;
+
+ default:
+ return 0;
+ }
+ }
+
+ if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
+ if (!ctx->cipher->init(ctx, key, iv, enc))
+ return 0;
+ }
+ ctx->buf_len = 0;
+ ctx->final_used = 0;
+ ctx->block_mask = ctx->cipher->block_size - 1;
+ return 1;
+}
+
+int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
+ const unsigned char *in, int inl)
+{
+ if (ctx->encrypt)
+ return EVP_EncryptUpdate(ctx, out, outl, in, inl);
+ else
+ return EVP_DecryptUpdate(ctx, out, outl, in, inl);
+}
+
+int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ if (ctx->encrypt)
+ return EVP_EncryptFinal_ex(ctx, out, outl);
+ else
+ return EVP_DecryptFinal_ex(ctx, out, outl);
+}
+
+int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ if (ctx->encrypt)
+ return EVP_EncryptFinal(ctx, out, outl);
+ else
+ return EVP_DecryptFinal(ctx, out, outl);
+}
+
+int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ const unsigned char *key, const unsigned char *iv)
+{
+ return EVP_CipherInit(ctx, cipher, key, iv, 1);
+}
+
+int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ ENGINE *impl, const unsigned char *key,
+ const unsigned char *iv)
+{
+ return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
+}
+
+int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ const unsigned char *key, const unsigned char *iv)
+{
+ return EVP_CipherInit(ctx, cipher, key, iv, 0);
+}
+
+int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
+ ENGINE *impl, const unsigned char *key,
+ const unsigned char *iv)
+{
+ return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
+}
+
+int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
+ const unsigned char *in, int inl)
+{
+ int i, j, bl;
+
+ if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
+ i = ctx->cipher->do_cipher(ctx, out, in, inl);
+ if (i < 0)
+ return 0;
+ else
+ *outl = i;
+ return 1;
+ }
+
+ if (inl <= 0) {
+ *outl = 0;
+ return inl == 0;
+ }
+
+ if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
+ if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
+ *outl = inl;
+ return 1;
+ } else {
+ *outl = 0;
+ return 0;
+ }
+ }
+ i = ctx->buf_len;
+ bl = ctx->cipher->block_size;
+ OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
+ if (i != 0) {
+ if (i + inl < bl) {
+ memcpy(&(ctx->buf[i]), in, inl);
+ ctx->buf_len += inl;
+ *outl = 0;
+ return 1;
+ } else {
+ j = bl - i;
+ memcpy(&(ctx->buf[i]), in, j);
+ if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
+ return 0;
+ inl -= j;
+ in += j;
+ out += bl;
+ *outl = bl;
+ }
+ } else
+ *outl = 0;
+ i = inl & (bl - 1);
+ inl -= i;
+ if (inl > 0) {
+ if (!ctx->cipher->do_cipher(ctx, out, in, inl))
+ return 0;
+ *outl += inl;
+ }
+
+ if (i != 0)
+ memcpy(ctx->buf, &(in[inl]), i);
+ ctx->buf_len = i;
+ return 1;
+}
+
+int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ int ret;
+ ret = EVP_EncryptFinal_ex(ctx, out, outl);
+ return ret;
+}
+
+int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ int n, ret;
+ unsigned int i, b, bl;
+
+ if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
+ ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
+ if (ret < 0)
+ return 0;
+ else
+ *outl = ret;
+ return 1;
+ }
+
+ b = ctx->cipher->block_size;
+ OPENSSL_assert(b <= sizeof ctx->buf);
+ if (b == 1) {
+ *outl = 0;
+ return 1;
+ }
+ bl = ctx->buf_len;
+ if (ctx->flags & EVP_CIPH_NO_PADDING) {
+ if (bl) {
+ EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
+ EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
+ return 0;
+ }
+ *outl = 0;
+ return 1;
+ }
+
+ n = b - bl;
+ for (i = bl; i < b; i++)
+ ctx->buf[i] = n;
+ ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
+
+ if (ret)
+ *outl = b;
+
+ return ret;
+}
+
+int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
+ const unsigned char *in, int inl)
+{
+ int fix_len;
+ unsigned int b;
+
+ if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
+ fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
+ if (fix_len < 0) {
+ *outl = 0;
+ return 0;
+ } else
+ *outl = fix_len;
+ return 1;
+ }
+
+ if (inl <= 0) {
+ *outl = 0;
+ return inl == 0;
+ }
+
+ if (ctx->flags & EVP_CIPH_NO_PADDING)
+ return EVP_EncryptUpdate(ctx, out, outl, in, inl);
+
+ b = ctx->cipher->block_size;
+ OPENSSL_assert(b <= sizeof ctx->final);
+
+ if (ctx->final_used) {
+ memcpy(out, ctx->final, b);
+ out += b;
+ fix_len = 1;
+ } else
+ fix_len = 0;
+
+ if (!EVP_EncryptUpdate(ctx, out, outl, in, inl))
+ return 0;
+
+ /*
+ * if we have 'decrypted' a multiple of block size, make sure we have a
+ * copy of this last block
+ */
+ if (b > 1 && !ctx->buf_len) {
+ *outl -= b;
+ ctx->final_used = 1;
+ memcpy(ctx->final, &out[*outl], b);
+ } else
+ ctx->final_used = 0;
+
+ if (fix_len)
+ *outl += b;
+
+ return 1;
+}
+
+int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ int ret;
+ ret = EVP_DecryptFinal_ex(ctx, out, outl);
+ return ret;
+}
+
+int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
+{
+ int i, n;
+ unsigned int b;
+ *outl = 0;
+
+ if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
+ i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
+ if (i < 0)
+ return 0;
+ else
+ *outl = i;
+ return 1;
+ }
+
+ b = ctx->cipher->block_size;
+ if (ctx->flags & EVP_CIPH_NO_PADDING) {
+ if (ctx->buf_len) {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
+ EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
+ return 0;
+ }
+ *outl = 0;
+ return 1;
+ }
+ if (b > 1) {
+ if (ctx->buf_len || !ctx->final_used) {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
+ return (0);
+ }
+ OPENSSL_assert(b <= sizeof ctx->final);
+
+ /*
+ * The following assumes that the ciphertext has been authenticated.
+ * Otherwise it provides a padding oracle.
+ */
+ n = ctx->final[b - 1];
+ if (n == 0 || n > (int)b) {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
+ return (0);
+ }
+ for (i = 0; i < n; i++) {
+ if (ctx->final[--b] != n) {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
+ return (0);
+ }
+ }
+ n = ctx->cipher->block_size - n;
+ for (i = 0; i < n; i++)
+ out[i] = ctx->final[i];
+ *outl = n;
+ } else
+ *outl = 0;
+ return (1);
+}
+
+void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
+{
+ if (ctx) {
+ EVP_CIPHER_CTX_cleanup(ctx);
+ OPENSSL_free(ctx);
+ }
+}
+
+int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
+{
+ if (c->cipher != NULL) {
+ if (c->cipher->cleanup && !c->cipher->cleanup(c))
+ return 0;
+ /* Cleanse cipher context data */
+ if (c->cipher_data)
+ OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
+ }
+ if (c->cipher_data)
+ OPENSSL_free(c->cipher_data);
+#ifndef OPENSSL_NO_ENGINE
+ if (c->engine)
+ /*
+ * The EVP_CIPHER we used belongs to an ENGINE, release the
+ * functional reference we held for this reason.
+ */
+ ENGINE_finish(c->engine);
+#endif
+ memset(c, 0, sizeof(EVP_CIPHER_CTX));
+ return 1;
+}
+
+int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
+{
+ if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
+ return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
+ if (c->key_len == keylen)
+ return 1;
+ if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
+ c->key_len = keylen;
+ return 1;
+ }
+ EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
+ return 0;
+}
+
+int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
+{
+ if (pad)
+ ctx->flags &= ~EVP_CIPH_NO_PADDING;
+ else
+ ctx->flags |= EVP_CIPH_NO_PADDING;
+ return 1;
+}
+
+int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
+{
+ int ret;
+ if (!ctx->cipher) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
+ return 0;
+ }
+
+ if (!ctx->cipher->ctrl) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
+ return 0;
+ }
+
+ ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
+ if (ret == -1) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
+ EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
+ return 0;
+ }
+ return ret;
+}
+
+int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
+{
+ if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
+ return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
+ if (RAND_bytes(key, ctx->key_len) <= 0)
+ return 0;
+ return 1;
+}
+
+int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
+{
+ if ((in == NULL) || (in->cipher == NULL)) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
+ return 0;
+ }
+#ifndef OPENSSL_NO_ENGINE
+ /* Make sure it's safe to copy a cipher context using an ENGINE */
+ if (in->engine && !ENGINE_init(in->engine)) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
+ return 0;
+ }
+#endif
+
+ EVP_CIPHER_CTX_cleanup(out);
+ memcpy(out, in, sizeof *out);
+
+ if (in->cipher_data && in->cipher->ctx_size) {
+ out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
+ if (!out->cipher_data) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
+ }