Fix some bugs with the cfb1 bitsize handling

Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5426)

crypto/evp/e_aes.c

@@ -2510,6 +2510,8 @@ static int aes_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                                 EVP_CIPHER_CTX_encrypting(ctx), dat->block);
         EVP_CIPHER_CTX_set_num(ctx, num);
         len -= MAXBITCHUNK;
+        out += MAXBITCHUNK;
+        in  += MAXBITCHUNK;
     }
     if (len) {
         int num = EVP_CIPHER_CTX_num(ctx);

crypto/evp/e_camellia.c

@@ -325,8 +325,10 @@ static int camellia_cfb1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
         int num = EVP_CIPHER_CTX_num(ctx);
         CRYPTO_cfb128_1_encrypt(in, out, MAXBITCHUNK * 8, &dat->ks,
                                 EVP_CIPHER_CTX_iv_noconst(ctx), &num, EVP_CIPHER_CTX_encrypting(ctx), dat->block);
-        len -= MAXBITCHUNK;
         EVP_CIPHER_CTX_set_num(ctx, num);
+        len -= MAXBITCHUNK;
+        out += MAXBITCHUNK;
+        in  += MAXBITCHUNK;
     }
     if (len) {
         int num = EVP_CIPHER_CTX_num(ctx);

crypto/include/internal/evp_int.h

@@ -214,7 +214,7 @@ static int cname##_cfb##cbits##_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
         cprefix##_cfb##cbits##_encrypt(in, out, (long) \
             ((cbits == 1) \
                 && !EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS) \
-                ? inl*8 : inl), \
+                ? chunk*8 : chunk), \
             &EVP_C_DATA(kstruct, ctx)->ksched, EVP_CIPHER_CTX_iv_noconst(ctx),\
             &num, EVP_CIPHER_CTX_encrypting(ctx));\
         EVP_CIPHER_CTX_set_num(ctx, num);\