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| author | Mark Johnston <markj@FreeBSD.org> | 2023-11-29 20:08:12 +0000 |
|---|---|---|
| committer | Mark Johnston <markj@FreeBSD.org> | 2023-12-03 17:48:09 +0000 |
| commit | 118b866d9c39da1f5a17680e2034b3eff7337988 (patch) | |
| tree | 30426e77c37f9fede276736e6def9efc114abe6b | |
| parent | 998d0babdde6e58e2675487cd12da97f4d625d9d (diff) | |
| download | src-118b866d9c39da1f5a17680e2034b3eff7337988.tar.gz src-118b866d9c39da1f5a17680e2034b3eff7337988.zip | |
ossl: Fix some bugs in the fallback AES-GCM implementation
gcm_*_aesni() are used when the AVX512 implementation is not available.
Fix two bugs which manifest when handling operations spanning multiple
segments:
- Avoid underflow when the length of the input is smaller than the
residual.
- In gcm_decrypt_aesni(), ensure that we begin the operation at the
right offset into the input and output buffers.
Reviewed by: jhb
Fixes: 9b1d87286c78 ("ossl: Add a fallback AES-GCM implementation using AES-NI")
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D42838
(cherry picked from commit 47d767dab54895f3ba8abac6ab2295797394659e)
| -rw-r--r-- | sys/crypto/openssl/amd64/ossl_aes_gcm.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/sys/crypto/openssl/amd64/ossl_aes_gcm.c b/sys/crypto/openssl/amd64/ossl_aes_gcm.c index 0d205ec3ff90..d08b2ac8a759 100644 --- a/sys/crypto/openssl/amd64/ossl_aes_gcm.c +++ b/sys/crypto/openssl/amd64/ossl_aes_gcm.c @@ -459,7 +459,7 @@ gcm_encrypt_aesni(struct ossl_gcm_context *ctx, const unsigned char *in, size_t bulk = 0, res; int error; - res = (AES_BLOCK_LEN - ctx->gcm.mres) % AES_BLOCK_LEN; + res = MIN(len, (AES_BLOCK_LEN - ctx->gcm.mres) % AES_BLOCK_LEN); if ((error = gcm_encrypt(ctx, in, out, res)) != 0) return error; @@ -621,12 +621,12 @@ gcm_decrypt_aesni(struct ossl_gcm_context *ctx, const unsigned char *in, size_t bulk = 0, res; int error; - res = (AES_BLOCK_LEN - ctx->gcm.mres) % AES_BLOCK_LEN; + res = MIN(len, (AES_BLOCK_LEN - ctx->gcm.mres) % AES_BLOCK_LEN); if ((error = gcm_decrypt(ctx, in, out, res)) != 0) return error; - bulk = aesni_gcm_decrypt(in, out, len, &ctx->aes_ks, ctx->gcm.Yi.c, - ctx->gcm.Xi.u); + bulk = aesni_gcm_decrypt(in + res, out + res, len - res, &ctx->aes_ks, + ctx->gcm.Yi.c, ctx->gcm.Xi.u); ctx->gcm.len.u[1] += bulk; bulk += res; |