#include "cryptlib.h"
#include <openssl/evp.h>
#include <openssl/err.h>
+#include <openssl/engine.h>
+#include "evp_locl.h"
+
+#include <assert.h>
const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
/* ctx->cipher=NULL; */
}
-int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *data,
- unsigned char *key, unsigned char *iv, int enc)
+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) return EVP_EncryptInit(ctx,data,key,iv);
- else return EVP_DecryptInit(ctx,data,key,iv);
+ 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)
+ /* 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,
- unsigned char *in, int inl)
+ const unsigned char *in, int inl)
{
if (ctx->encrypt)
return EVP_EncryptUpdate(ctx,out,outl,in,inl);
{
if (ctx->encrypt)
return EVP_EncryptFinal(ctx,out,outl);
- else return(EVP_DecryptFinal(ctx,out,outl));
+ else return EVP_DecryptFinal(ctx,out,outl);
}
int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
- unsigned char *key, unsigned char *iv)
+ const unsigned char *key, const unsigned char *iv)
{
- if (cipher != NULL)
- {
- ctx->cipher=cipher;
- ctx->key_len = cipher->key_len;
- }
- if(!ctx->cipher->init(ctx,key,iv,1)) return 0;
- ctx->encrypt=1;
- ctx->buf_len=0;
- return 1;
+ return EVP_CipherInit_ex(ctx, cipher, NULL, 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,
- unsigned char *key, unsigned char *iv)
+ const unsigned char *key, const unsigned char *iv)
{
- if (cipher != NULL)
- {
- ctx->cipher=cipher;
- ctx->key_len = cipher->key_len;
- }
- if(!ctx->cipher->init(ctx,key,iv,0)) return 0;
- ctx->encrypt=0;
- ctx->buf_len=0;
- return 1;
+ return EVP_CipherInit_ex(ctx, cipher, NULL, 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,
- unsigned char *in, int inl)
+ const unsigned char *in, int inl)
{
int i,j,bl;
+ 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;
- *outl=0;
- if ((inl == 0) && (i != bl)) return 1;
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;
- if (j != 0) memcpy(&(ctx->buf[i]),in,j);
+ 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;
+ *outl=bl;
}
}
- i=inl%bl; /* how much is left */
+ else
+ *outl = 0;
+ i=inl&(bl-1);
inl-=i;
if (inl > 0)
{
int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
- int i,n,b,bl;
+ int i,n,b,bl,ret;
b=ctx->cipher->block_size;
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);
+ return 0;
+ }
+ *outl = 0;
+ return 1;
+ }
+
n=b-bl;
for (i=bl; i<b; i++)
ctx->buf[i]=n;
- if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,b)) return 0;
- *outl=b;
- return 1;
+ ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b);
+
+ EVP_CIPHER_CTX_cleanup(ctx);
+
+ if(ret)
+ *outl=b;
+
+ return ret;
}
int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
- unsigned char *in, int inl)
+ const unsigned char *in, int inl)
{
- int b,bl,n;
- int keep_last=0;
+ int b, fix_len;
- *outl=0;
- if (inl == 0) return 1;
+ if (inl == 0)
+ {
+ *outl=0;
+ return 1;
+ }
+
+ if (ctx->flags & EVP_CIPH_NO_PADDING)
+ return EVP_EncryptUpdate(ctx, out, outl, in, inl);
b=ctx->cipher->block_size;
- if (b > 1)
+
+ if(ctx->final_used)
{
- /* Is the input a multiple of the block size? */
- bl=ctx->buf_len;
- n=inl+bl;
- if (n%b == 0)
- {
- if (inl < b) /* must be 'just one' buff */
- {
- memcpy(&(ctx->buf[bl]),in,inl);
- ctx->buf_len=b;
- *outl=0;
- return 1;
- }
- keep_last=1;
- inl-=b; /* don't do the last block */
- }
+ memcpy(out,ctx->final,b);
+ out+=b;
+ fix_len = 1;
}
- if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) return 0;
+ 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 (keep_last)
+ if (b > 1 && !ctx->buf_len)
{
- memcpy(&(ctx->buf[0]),&(in[inl]),b);
-#ifdef DEBUG
- if (ctx->buf_len != 0)
- {
- abort();
- }
-#endif
- ctx->buf_len=b;
+ *outl-=b;
+ ctx->final_used=1;
+ memcpy(ctx->final,&out[*outl],b);
}
+ else
+ ctx->final_used = 0;
+
+ if (fix_len)
+ *outl += b;
+
return 1;
}
*outl=0;
b=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);
+ return 0;
+ }
+ *outl = 0;
+ return 1;
+ }
if (b > 1)
{
- if (ctx->buf_len != b)
+ 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);
}
- if(!EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0)) return 0;
- if (n != b)
- return(0);
- n=ctx->buf[b-1];
+ n=ctx->final[b-1];
if (n > b)
{
+ EVP_CIPHER_CTX_cleanup(ctx);
EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
return(0);
}
for (i=0; i<n; i++)
{
- if (ctx->buf[--b] != n)
+ if (ctx->final[--b] != n)
{
+ EVP_CIPHER_CTX_cleanup(ctx);
EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
return(0);
}
}
n=ctx->cipher->block_size-n;
for (i=0; i<n; i++)
- out[i]=ctx->buf[i];
+ out[i]=ctx->final[i];
*outl=n;
}
else
*outl=0;
+ EVP_CIPHER_CTX_cleanup(ctx);
return(1);
}
{
if(!c->cipher->cleanup(c)) return 0;
}
+ 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)
{
+ 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))
{
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;
+}
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