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Add CRYPTO_gcm128_tag() function to retrieve the tag.

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This commit is contained in:
Dr. Stephen Henson 2011-02-07 18:05:27 +00:00
parent d45087c672
commit fd3dbc1dbf
2 changed files with 7 additions and 0 deletions
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6
crypto/modes/gcm128.c
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@ -1337,6 +1337,12 @@ int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx,const unsigned char *tag,
return -1; return -1;
} }
void CRYPTO_gcm128_tag(GCM128_CONTEXT *ctx, unsigned char *tag, size_t len)
{
CRYPTO_gcm128_finish(ctx, NULL, 0);
memcpy(tag, ctx->Xi.c, len);
}
GCM128_CONTEXT *CRYPTO_gcm128_new(void *key, block128_f block) GCM128_CONTEXT *CRYPTO_gcm128_new(void *key, block128_f block)
{ {
GCM128_CONTEXT *ret; GCM128_CONTEXT *ret;

1
crypto/modes/modes.h
View File

@ -102,4 +102,5 @@ void CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
size_t len, ctr128_f stream); size_t len, ctr128_f stream);
int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx,const unsigned char *tag, int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx,const unsigned char *tag,
size_t len); size_t len);
void CRYPTO_gcm128_tag(GCM128_CONTEXT *ctx, unsigned char *tag, size_t len);
void CRYPTO_gcm128_release(GCM128_CONTEXT *ctx); void CRYPTO_gcm128_release(GCM128_CONTEXT *ctx);