OSSL_HEX_CHARS_PER_BYTE
for (i = 0; i < len && (i + 1) * OSSL_HEX_CHARS_PER_BYTE < sizeof(buf); i++)
BIO_snprintf(buf + i * OSSL_HEX_CHARS_PER_BYTE,
OSSL_HEX_CHARS_PER_BYTE + 1, "%02x", md[i]);
for (i = 0; i < len && (i + 1) * OSSL_HEX_CHARS_PER_BYTE < sizeof(buf); i++)
BIO_snprintf(buf + i * OSSL_HEX_CHARS_PER_BYTE,
OSSL_HEX_CHARS_PER_BYTE + 1, "%02x", md[i]);