#include "cryptlib.h"
#include <openssl/evp.h>
#include <openssl/err.h>
+#include <openssl/rand.h>
+#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
+#endif
+#include "../constant_time_locl.h"
#include "evp_locl.h"
-#include <assert.h>
+#ifdef OPENSSL_FIPS
+ #define M_do_cipher(ctx, out, in, inl) \
+ EVP_Cipher(ctx,out,in,inl)
+#else
+ #define M_do_cipher(ctx, out, in, inl) \
+ ctx->cipher->do_cipher(ctx,out,in,inl)
+#endif
-const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
+const char EVP_version[]="EVP" OPENSSL_VERSION_PTEXT;
-void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx)
+EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
{
- memset(ctx,0,sizeof(EVP_CIPHER_CTX));
- /* ctx->cipher=NULL; */
+ EVP_CIPHER_CTX *ctx=OPENSSL_malloc(sizeof *ctx);
+ if (ctx)
+ EVP_CIPHER_CTX_init(ctx);
+ return ctx;
}
-
int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
const unsigned char *key, const unsigned char *iv, int enc)
{
return EVP_CipherInit_ex(ctx,cipher,NULL,key,iv,enc);
}
-int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
- const unsigned char *key, const unsigned char *iv, int enc)
- {
- if(enc && (enc != -1)) enc = 1;
- /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts
- * so this context may already have an ENGINE! Try to avoid releasing
- * the previous handle, re-querying for an ENGINE, and having a
- * reinitialisation, when it may all be unecessary. */
- if (ctx->engine && ctx->cipher && (!cipher ||
- (cipher && (cipher->nid == ctx->cipher->nid))))
- goto skip_to_init;
- if (cipher)
- {
- /* Ensure an ENGINE left lying around from last time is cleared
- * (the previous check attempted to avoid this if the same
- * ENGINE and EVP_CIPHER could be used). */
- if(ctx->engine)
- ENGINE_finish(ctx->engine);
- if(impl)
- {
- if (!ENGINE_init(impl))
- {
- EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
- return 0;
- }
- }
- else
- /* Ask if an ENGINE is reserved for this job */
- impl = ENGINE_get_cipher_engine(cipher->nid);
- if(impl)
- {
- /* There's an ENGINE for this job ... (apparently) */
- const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
- if(!c)
- {
- /* One positive side-effect of US's export
- * control history, is that we should at least
- * be able to avoid using US mispellings of
- * "initialisation"? */
- EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
- return 0;
- }
- /* We'll use the ENGINE's private cipher definition */
- cipher = c;
- /* Store the ENGINE functional reference so we know
- * 'cipher' came from an ENGINE and we need to release
- * it when done. */
- ctx->engine = impl;
- }
- else
- ctx->engine = NULL;
- ctx->cipher=cipher;
- ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
- ctx->key_len = cipher->key_len;
- ctx->flags = 0;
- if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT)
- {
- if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL))
- {
- EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
- return 0;
- }
- }
- }
- else if(!ctx->cipher)
- {
- EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
- return 0;
- }
-skip_to_init:
- /* we assume block size is a power of 2 in *cryptUpdate */
- assert(ctx->cipher->block_size == 1
- || ctx->cipher->block_size == 8
- || ctx->cipher->block_size == 16);
-
- 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;
-
- case EVP_CIPH_CBC_MODE:
-
- if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
- memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
- break;
-
- default:
- return 0;
- break;
- }
- }
-
- if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
- if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
- }
- if(enc != -1) ctx->encrypt=enc;
- 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)
{
int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
const unsigned char *key, const unsigned char *iv)
{
- return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, 0);
+ return EVP_CipherInit(ctx, cipher, key, iv, 0);
}
int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl,
{
int i,j,bl;
+ 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))
+ if(M_do_cipher(ctx,out,in,inl))
{
*outl=inl;
return 1;
}
i=ctx->buf_len;
bl=ctx->cipher->block_size;
+ OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
if (i != 0)
{
if (i+inl < bl)
{
j=bl-i;
memcpy(&(ctx->buf[i]),in,j);
- if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
+ if(!M_do_cipher(ctx,out,ctx->buf,bl)) return 0;
inl-=j;
in+=j;
out+=bl;
inl-=i;
if (inl > 0)
{
- if(!ctx->cipher->do_cipher(ctx,out,in,inl)) return 0;
+ if(!M_do_cipher(ctx,out,in,inl)) return 0;
*outl+=inl;
}
{
int ret;
ret = EVP_EncryptFinal_ex(ctx, out, outl);
- EVP_CIPHER_CTX_cleanup(ctx);
return ret;
}
int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
- int i,n,b,bl,ret;
+ int n,ret;
+ unsigned int i, b, bl;
b=ctx->cipher->block_size;
+ OPENSSL_assert(b <= sizeof ctx->buf);
if (b == 1)
{
- EVP_CIPHER_CTX_cleanup(ctx);
*outl=0;
return 1;
}
bl=ctx->buf_len;
if (ctx->flags & EVP_CIPH_NO_PADDING)
{
- EVP_CIPHER_CTX_cleanup(ctx);
if(bl)
{
- EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
+ EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
return 0;
}
*outl = 0;
n=b-bl;
for (i=bl; i<b; i++)
ctx->buf[i]=n;
- ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
+ ret=M_do_cipher(ctx,out,ctx->buf,b);
- EVP_CIPHER_CTX_cleanup(ctx);
if(ret)
*outl=b;
int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
const unsigned char *in, int inl)
{
- int b, fix_len;
+ int fix_len;
+ unsigned int b;
- if (inl == 0)
+ if (inl <= 0)
{
- *outl=0;
- return 1;
+ *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)
{
{
int ret;
ret = EVP_DecryptFinal_ex(ctx, out, outl);
- EVP_CIPHER_CTX_cleanup(ctx);
return ret;
}
int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
- int i,b;
- int n;
+ unsigned int i, b;
+ unsigned char pad, padding_good;
*outl=0;
- b=ctx->cipher->block_size;
+ b=(unsigned int)(ctx->cipher->block_size);
if (ctx->flags & EVP_CIPH_NO_PADDING)
{
- EVP_CIPHER_CTX_cleanup(ctx);
if(ctx->buf_len)
{
- EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
return 0;
}
*outl = 0;
{
if (ctx->buf_len || !ctx->final_used)
{
- EVP_CIPHER_CTX_cleanup(ctx);
- EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
- return(0);
- }
- n=ctx->final[b-1];
- if (n > b)
- {
- EVP_CIPHER_CTX_cleanup(ctx);
- EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
+ EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
return(0);
}
- for (i=0; i<n; i++)
+ OPENSSL_assert(b <= sizeof ctx->final);
+ pad=ctx->final[b-1];
+
+ padding_good = (unsigned char)(~constant_time_is_zero_8(pad));
+ padding_good &= constant_time_ge_8(b, pad);
+
+ for (i = 1; i < b; ++i)
{
- if (ctx->final[--b] != n)
- {
- EVP_CIPHER_CTX_cleanup(ctx);
- EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
- return(0);
- }
+ unsigned char is_pad_index = constant_time_lt_8(i, pad);
+ unsigned char pad_byte_good = constant_time_eq_8(ctx->final[b-i-1], pad);
+ padding_good &= constant_time_select_8(is_pad_index, pad_byte_good, 0xff);
}
- n=ctx->cipher->block_size-n;
- for (i=0; i<n; i++)
- out[i]=ctx->final[i];
- *outl=n;
+
+ /*
+ * At least 1 byte is always padding, so we always write b - 1
+ * bytes to avoid a timing leak. The caller is required to have |b|
+ * bytes space in |out| by the API contract.
+ */
+ for (i = 0; i < b - 1; ++i)
+ out[i] = ctx->final[i] & padding_good;
+ /* Safe cast: for a good padding, EVP_MAX_IV_LENGTH >= b >= pad */
+ *outl = padding_good & ((unsigned char)(b - pad));
+ return padding_good & 1;
}
else
- *outl=0;
- EVP_CIPHER_CTX_cleanup(ctx);
- return(1);
+ {
+ *outl = 0;
+ return 1;
+ }
}
-int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c)
+void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
{
- if ((c->cipher != NULL) && (c->cipher->cleanup != NULL))
+ if (ctx)
{
- if(!c->cipher->cleanup(c)) return 0;
+ EVP_CIPHER_CTX_cleanup(ctx);
+ OPENSSL_free(ctx);
}
- OPENSSL_free(c->cipher_data);
- 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);
- memset(c,0,sizeof(EVP_CIPHER_CTX));
- return 1;
}
int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
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);
+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;
}
- if(!ctx->cipher->ctrl) {
- EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
- return 0;
+#ifndef OPENSSL_NO_ENGINE
+
+#ifdef OPENSSL_FIPS
+
+static int do_evp_enc_engine_full(EVP_CIPHER_CTX *ctx, const EVP_CIPHER **pcipher, ENGINE *impl)
+ {
+ if(impl)
+ {
+ if (!ENGINE_init(impl))
+ {
+ EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ }
+ else
+ /* Ask if an ENGINE is reserved for this job */
+ impl = ENGINE_get_cipher_engine((*pcipher)->nid);
+ if(impl)
+ {
+ /* There's an ENGINE for this job ... (apparently) */
+ const EVP_CIPHER *c = ENGINE_get_cipher(impl, (*pcipher)->nid);
+ if(!c)
+ {
+ /* One positive side-effect of US's export
+ * control history, is that we should at least
+ * be able to avoid using US mispellings of
+ * "initialisation"? */
+ EVPerr(EVP_F_DO_EVP_ENC_ENGINE_FULL, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ /* We'll use the ENGINE's private cipher definition */
+ *pcipher = c;
+ /* Store the ENGINE functional reference so we know
+ * 'cipher' came from an ENGINE and we need to release
+ * it when done. */
+ ctx->engine = impl;
+ }
+ else
+ ctx->engine = NULL;
+ return 1;
}
- 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;
+void int_EVP_CIPHER_init_engine_callbacks(void)
+ {
+ int_EVP_CIPHER_set_engine_callbacks(
+ ENGINE_finish, do_evp_enc_engine_full);
}
- return ret;
-}
+
+#endif
+
+#endif
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