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OpenSSL: Convert low level AES API use to EVP

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This allows the AES operations to be used in OpenSSL FIPS mode.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-08-16 18:27:23 +03:00
parent e001191837
commit 860a93d5f7
1 changed files with 80 additions and 15 deletions
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95
src/crypto/crypto_openssl.c
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@ -202,54 +202,119 @@ int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len,
#endif /* NO_SHA256_WRAPPER */
static const EVP_CIPHER * aes_get_evp_cipher(size_t keylen)
{
switch (keylen) {
case 16:
return EVP_aes_128_ecb();
case 24:
return EVP_aes_192_ecb();
case 32:
return EVP_aes_256_ecb();
}
return NULL;
}
void * aes_encrypt_init(const u8 *key, size_t len)
{
AES_KEY *ak;
ak = os_malloc(sizeof(*ak));
if (ak == NULL)
EVP_CIPHER_CTX *ctx;
const EVP_CIPHER *type;
type = aes_get_evp_cipher(len);
if (type == NULL)
return NULL;
if (AES_set_encrypt_key(key, 8 * len, ak) < 0) {
os_free(ak);
ctx = os_malloc(sizeof(*ctx));
if (ctx == NULL)
return NULL;
EVP_CIPHER_CTX_init(ctx);
if (EVP_EncryptInit_ex(ctx, type, NULL, key, NULL) != 1) {
os_free(ctx);
return NULL;
}
return ak;
EVP_CIPHER_CTX_set_padding(ctx, 0);
return ctx;
}
void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
{
AES_encrypt(plain, crypt, ctx);
EVP_CIPHER_CTX *c = ctx;
int clen = 16;
if (EVP_EncryptUpdate(c, crypt, &clen, plain, 16) != 1) {
wpa_printf(MSG_ERROR, "OpenSSL: EVP_EncryptUpdate failed: %s",
ERR_error_string(ERR_get_error(), NULL));
}
}
void aes_encrypt_deinit(void *ctx)
{
os_free(ctx);
EVP_CIPHER_CTX *c = ctx;
u8 buf[16];
int len = sizeof(buf);
if (EVP_EncryptFinal_ex(c, buf, &len) != 1) {
wpa_printf(MSG_ERROR, "OpenSSL: EVP_EncryptFinal_ex failed: "
"%s", ERR_error_string(ERR_get_error(), NULL));
}
if (len != 0) {
wpa_printf(MSG_ERROR, "OpenSSL: Unexpected padding length %d "
"in AES encrypt", len);
}
EVP_CIPHER_CTX_cleanup(c);
os_free(c);
}
void * aes_decrypt_init(const u8 *key, size_t len)
{
AES_KEY *ak;
ak = os_malloc(sizeof(*ak));
if (ak == NULL)
EVP_CIPHER_CTX *ctx;
const EVP_CIPHER *type;
type = aes_get_evp_cipher(len);
if (type == NULL)
return NULL;
if (AES_set_decrypt_key(key, 8 * len, ak) < 0) {
os_free(ak);
ctx = os_malloc(sizeof(*ctx));
if (ctx == NULL)
return NULL;
EVP_CIPHER_CTX_init(ctx);
if (EVP_DecryptInit_ex(ctx, type, NULL, key, NULL) != 1) {
os_free(ctx);
return NULL;
}
return ak;
EVP_CIPHER_CTX_set_padding(ctx, 0);
return ctx;
}
void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
{
AES_decrypt(crypt, plain, ctx);
EVP_CIPHER_CTX *c = ctx;
int plen = 16;
if (EVP_DecryptUpdate(c, plain, &plen, crypt, 16) != 1) {
wpa_printf(MSG_ERROR, "OpenSSL: EVP_DecryptUpdate failed: %s",
ERR_error_string(ERR_get_error(), NULL));
}
}
void aes_decrypt_deinit(void *ctx)
{
EVP_CIPHER_CTX *c = ctx;
u8 buf[16];
int len = sizeof(buf);
if (EVP_DecryptFinal_ex(c, buf, &len) != 1) {
wpa_printf(MSG_ERROR, "OpenSSL: EVP_DecryptFinal_ex failed: "
"%s", ERR_error_string(ERR_get_error(), NULL));
}
if (len != 0) {
wpa_printf(MSG_ERROR, "OpenSSL: Unexpected padding length %d "
"in AES decrypt", len);
}
EVP_CIPHER_CTX_cleanup(c);
os_free(ctx);
}