diff options
author | Adam Langley <agl@chromium.org> | 2014-08-13 21:31:04 +0400 |
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committer | Adam Langley <agl@google.com> | 2014-08-14 20:37:22 +0400 |
commit | 660140206ed32aa217ba3f299debae8d9ac472ec (patch) | |
tree | fb2321bcc1ffe3dc95b6dfa09e9b6859bfcb9761 /crypto/base64 | |
parent | e2c4d262141f9a7de9baf6d0d7151682e9947357 (diff) |
Add EVP_EncodedLength.
Several callers of EVP_EncodeBlock are doing ad-hoc versions of this
function without any overflow checks.
Change-Id: I4d0cad2347ea8c44b42465e8b14b2783db69ee8f
Reviewed-on: https://boringssl-review.googlesource.com/1511
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
Diffstat (limited to 'crypto/base64')
-rw-r--r-- | crypto/base64/base64.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/crypto/base64/base64.c b/crypto/base64/base64.c index 4cd95d60..2336cf53 100644 --- a/crypto/base64/base64.c +++ b/crypto/base64/base64.c @@ -402,3 +402,21 @@ int EVP_DecodeBlock(uint8_t *dst, const uint8_t *src, size_t src_len) { return ret; } + +int EVP_EncodedLength(size_t *out_len, size_t len) { + if (len + 2 < len) { + return 0; + } + len += 2; + len /= 3; + if (((len << 2) >> 2) != len) { + return 0; + } + len <<= 2; + if (len + 1 < len) { + return 0; + } + len++; + *out_len = len; + return 1; +} |