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fix EVP_CipherUpdate padding

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This commit is contained in:
Takashi Kojo
2019-11-20 19:32:18 +09:00
committed by Jacob Barthelmeh
parent 88fb7efb8c
commit 4896a48955
1 changed files with 24 additions and 10 deletions
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34
wolfcrypt/src/evp.c
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@@ -375,10 +375,12 @@ WOLFSSL_API int wolfSSL_EVP_CipherUpdate(WOLFSSL_EVP_CIPHER_CTX *ctx,
{
int blocks;
int fill;
int copied;
if ((ctx == NULL) || (inl < 0) ||
(outl == NULL)|| (in == NULL)) return BAD_FUNC_ARG;
WOLFSSL_ENTER("wolfSSL_EVP_CipherUpdate");
printf("wolfSSL_EVP_CipherUpdate\n");
*outl = 0;
if (inl == 0) return WOLFSSL_SUCCESS;
@@ -400,34 +402,42 @@ WOLFSSL_API int wolfSSL_EVP_CipherUpdate(WOLFSSL_EVP_CIPHER_CTX *ctx,
return BAD_FUNC_ARG;
if (ctx->bufUsed > 0) { /* concatinate them if there is anything */
printf("head fillBuff inl=%d, ctx->bufUsed=%d\n", inl, ctx->bufUsed);
fill = fillBuff(ctx, in, inl);
inl -= fill;
in += fill;
printf("head fillBuff inl=%d, ctx->bufUsed=%d\n", inl, ctx->bufUsed);
}
if ((ctx->enc == 0)&& (ctx->lastUsed == 1)) {
if ((ctx->enc == 0) && (ctx->lastUsed == 1) && (inl > 0/*ctx->block_size*/)) {
PRINT_BUF(ctx->lastBlock, ctx->block_size);
XMEMCPY(out, ctx->lastBlock, ctx->block_size);
*outl+= ctx->block_size;
out += ctx->block_size;
ctx->lastUsed = 0;
copied = 1;
printf("Copied out last block - 1\n");
}
if (ctx->bufUsed == ctx->block_size) {
if (ctx->bufUsed == ctx->block_size /* && inl/ctx->block_size != 0*/) {
/* the buff is full, flash out */
PRINT_BUF(ctx->buf, ctx->block_size);
if (evpCipherBlock(ctx, out, ctx->buf, ctx->block_size) == 0)
return WOLFSSL_FAILURE;
PRINT_BUF(out, ctx->block_size);
if (ctx->enc == 0) {
ctx->lastUsed = 1;
XMEMCPY(ctx->lastBlock, out, ctx->block_size);
} else {
*outl+= ctx->block_size;
out += ctx->block_size;
}
*outl+= ctx->block_size;
out += ctx->block_size;
ctx->bufUsed = 0;
}
blocks = inl / ctx->block_size;
if (blocks > 0) {
if ((ctx->enc == 0) && (ctx->lastUsed == 1) && (copied == 0)) {
PRINT_BUF(ctx->lastBlock, ctx->block_size);
XMEMCPY(out, ctx->lastBlock, ctx->block_size);
*outl += ctx->block_size;
out += ctx->block_size;
ctx->lastUsed = 0;
printf("Copied out last block - 2\n");
}
/* process blocks */
if (evpCipherBlock(ctx, out, in, blocks * ctx->block_size) == 0)
return WOLFSSL_FAILURE;
@@ -447,6 +457,7 @@ WOLFSSL_API int wolfSSL_EVP_CipherUpdate(WOLFSSL_EVP_CIPHER_CTX *ctx,
* EVP_CipherFinal call */
XMEMCPY(ctx->lastBlock, &out[ctx->block_size * blocks],
ctx->block_size);
printf("Saved last block\n");
}
*outl+= ctx->block_size * blocks;
}
@@ -457,9 +468,10 @@ WOLFSSL_API int wolfSSL_EVP_CipherUpdate(WOLFSSL_EVP_CIPHER_CTX *ctx,
if (inl > 0) {
/* put fraction into buff */
fillBuff(ctx, in, inl);
printf("tailing fillBuff inl=%d\n", inl);
/* no increase of outl */
}
printf("Returning outl=%d, ctx->lastUsed= %d, ctx->bufUsed=%d\n", *outl, ctx->lastUsed, ctx->bufUsed);
(void)out; /* silence warning in case not read */
return WOLFSSL_SUCCESS;
@@ -515,6 +527,7 @@ int wolfSSL_EVP_CipherFinal(WOLFSSL_EVP_CIPHER_CTX *ctx,
*outl = 0;
}
else if (ctx->enc) {
printf("EVP_CipherFinal(ctx->enc)\n");
if (ctx->block_size == 1) {
*outl = 0;
}
@@ -547,6 +560,7 @@ int wolfSSL_EVP_CipherFinal(WOLFSSL_EVP_CIPHER_CTX *ctx,
if (ctx->lastUsed == 0 && ctx->bufUsed == 0) {
/* return error in cases where the block length is incorrect */
ret = WOLFSSL_FAILURE;
printf("EVP_CipherFinal(ctx->lastUsed == 0 && ctx->bufUsed == 0) fl=%d\n", fl);
}
}
else {