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Make the CBC mode od AES accept lengths that aren't multiples of 16.
author
Richard Levitte
<levitte@openssl.org>
Tue, 12 Nov 2002 11:00:25 +0000
(11:00 +0000)
committer
Richard Levitte
<levitte@openssl.org>
Tue, 12 Nov 2002 11:00:25 +0000
(11:00 +0000)
PR: 330
crypto/aes/aes_cbc.c
patch
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diff --git
a/crypto/aes/aes_cbc.c
b/crypto/aes/aes_cbc.c
index 3dfd7aba2a1900d454ebfbd39d78bd9b7f6a9897..bf1a808cf0e1ea168cba4403ae7819e92ee5c77a 100644
(file)
--- a/
crypto/aes/aes_cbc.c
+++ b/
crypto/aes/aes_cbc.c
@@
-62,11
+62,10
@@
void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
unsigned char tmp[16];
assert(in && out && key && ivec);
unsigned char tmp[16];
assert(in && out && key && ivec);
- assert(length % AES_BLOCK_SIZE == 0);
assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
- if (AES_ENCRYPT == enc)
- while (len >
0
) {
+ if (AES_ENCRYPT == enc)
{
+ while (len >
= AES_BLOCK_SIZE
) {
for(n=0; n < 16; ++n)
tmp[n] = in[n] ^ ivec[n];
AES_encrypt(tmp, out, key);
for(n=0; n < 16; ++n)
tmp[n] = in[n] ^ ivec[n];
AES_encrypt(tmp, out, key);
@@
-75,8
+74,17
@@
void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
in += 16;
out += 16;
}
in += 16;
out += 16;
}
- else
- while (len > 0) {
+ if (len) {
+ for(n=0; n < len; ++n)
+ tmp[n] = in[n] ^ ivec[n];
+ for(n=len; n < AES_BLOCK_SIZE; ++n)
+ tmp[n] = ivec[n];
+ AES_encrypt(tmp, tmp, key);
+ memcpy(out, tmp, len);
+ memcpy(ivec, tmp, 16);
+ }
+ } else {
+ while (len >= AES_BLOCK_SIZE) {
memcpy(tmp, in, 16);
AES_decrypt(in, out, key);
for(n=0; n < 16; ++n)
memcpy(tmp, in, 16);
AES_decrypt(in, out, key);
for(n=0; n < 16; ++n)
@@
-86,4
+94,12
@@
void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
in += 16;
out += 16;
}
in += 16;
out += 16;
}
+ if (len) {
+ memcpy(tmp, in, 16);
+ AES_decrypt(tmp, tmp, key);
+ for(n=0; n < len; ++n)
+ out[n] ^= ivec[n];
+ memcpy(ivec, tmp, 16);
+ }
+ }
}
}